Patent Application
20160184662
The present application is directed to embodiments of golf club heads, particularly club heads that have adjustable components including connection assemblies having at least one non-metallic component.
For a given type of golf club (e.g., driver, iron, putter, wedge), the golfing consumer has a wide variety of variations to choose from. This variety is driven, in part, by the wide range in physical characteristics and golfing skill among golfers and by the broad spectrum of playing conditions that a golfer may encounter. For example, taller golfers require clubs with longer shafts; more powerful golfers or golfers playing in windy conditions or on a course with firm fairways may desire clubs having less shaft flex (greater stiffness); and a golfer may desire a club with certain playing characteristics to overcome a tendency in their swing (e.g., a golfer who has a tendency to hit low-trajectory shots may want to purchase a club with a greater loft angle). Variations in shaft flex, loft angle and handedness (i.e., left or right) alone account for 24 variations of the TaylorMade r7 460 driver.
Having such a large number of variations available for a single golf club, golfing consumers can purchase clubs with club head-shaft combinations that suit their needs. However, shafts and club heads are generally manufactured separately, and once a shaft is attached to a club head, usually by an adhesive, replacing either the club head or shaft is not easily done by the consumer. Motivations for modifying a club include a change in a golfer's physical condition (e.g., a younger golfer has grown taller), an increase the golfer's skill or to adjust to playing conditions. Typically, these modifications must be made by a technician at a pro shop. The attendant cost and time spent without clubs may dissuade golfers from modifying their clubs as often as they would like, resulting in a less-than-optimal golfing experience. Thus, there has been effort to provide golf clubs that are capable of being assembled and disassembled by the golfing consumer.
To that end, golf clubs having club heads that are removably attached to a shaft by a mechanical fastener are known in the art. For example, U.S. Pat. No. 7,083,529 to Cackett et al. (hereinafter, “Cackett”) discloses a golf club with interchangeable head-shaft connections. The connection includes a tube, a sleeve and a mechanical fastener. The sleeve is mounted on a tip end of the shaft. The shaft with the sleeve mounted thereon is then inserted in the tube, which is mounted in the club head. The mechanical fastener secures the sleeve to the tube to retain the shaft in connection with the club head. The sleeve has a lower section that includes a keyed portion which has a configuration that is complementary to the keyway defined by a rotation prevention portion of the tube. The keyway has a non-circular cross-section to prevent rotation of the sleeve relative to the tube. The keyway may have a plurality of splines, or a rectangular or hexagonal cross-section.
While removably attachable golf club heads of the type represented by Cackett provide golfers with the ability to disassemble a club head from a shaft, it is necessary that they also provide club head-shaft interconnections that have the integrity and rigidity of conventional club head-shaft interconnection. For example, the manner in which rotational movement between the constituent components of a club head-shaft interconnection is restricted must have sufficient load-bearing areas and resistance to stripping. Consequently, there is room for improvement in the art.
In a representative embodiment, a golf club shaft assembly for attaching to a club head comprises a shaft having a lower end portion and a sleeve mounted on the lower end portion of the shaft. The sleeve can be configured to be inserted into a hosel opening of the club head. The sleeve has an upper portion defining an upper opening that receives the lower end portion of the shaft and a lower portion having eight, longitudinally extending, angularly spaced external splines located below the shaft and adapted to mate with complimentary splines in the hosel opening. The lower portion defines a longitudinally extending, internally threaded opening adapted to receive a screw for securing the shaft assembly to the club head when the sleeve is inserted in the hosel opening.
In another representative embodiment, a method of assembling a golf club shaft and a golf club head is provided. The method comprises mounting a sleeve onto a tip end portion of the shaft, the sleeve having a lower portion having eight external splines protruding from an external surface and located below a lower end of the shaft, the external splines having a configuration complementary to internal splines located in a hosel opening in the club head. The method further comprises inserting the sleeve into the hosel opening so that the external splines of the sleeve lower portion engage the internal splines of the hosel opening, and inserting a screw through an opening in the sole of the club head and into a threaded opening in the sleeve and tightening the screw to secure the shaft to the club head.
In another representative embodiment, a removable shaft assembly for a golf club having a hosel defining a hosel opening comprises a shaft having a lower end portion. A sleeve can be mounted on the lower end portion of the shaft and can be configured to be inserted into the hosel opening of the club head. The sleeve has an upper portion defining an upper opening that receives the lower end portion of the shaft and a lower portion having a plurality of longitudinally extending, angularly spaced external splines located below the shaft and adapted to mate with complimentary splines in the hosel opening. The lower portion defines a longitudinally extending, internally threaded opening adapted to receive a screw for securing the shaft assembly to the club head when the sleeve is inserted in the hosel opening. The upper portion of the sleeve has an upper thrust surface that is adapted to engage the hosel of the club head when the sleeve is inserted into the hosel opening, and the sleeve and the shaft have a combined axial stiffness from the upper thrust surface to a lower end of the sleeve of less than about 1.87×108 N/m.
In another representative embodiment, a golf club assembly comprises a club head having a hosel defining an opening having a non-circular inner surface, the hosel defining a longitudinal axis. A removable adapter sleeve is configured to be received in the hosel opening, the sleeve having a non-circular outer surface adapted to mate with the non-circular inner surface of the hosel to restrict relative rotation between the adapter sleeve and the hosel. The adapter sleeve has a longitudinally extending opening and a non-circular inner surface in the opening, the adapter sleeve also having a longitudinal axis that is angled relative to the longitudinal axis of the hosel at a predetermined, non-zero angle. The golf club assembly also comprises a shaft having a lower end portion and a shaft sleeve mounted on the lower end portion of the shaft and adapted to be received in the opening of the adapter sleeve. The shaft sleeve has a noncircular outer surface adapted to mate with the non-circular inner surface of the adapter sleeve to restrict relative rotation between the shaft sleeve and the adapter sleeve. The shaft sleeve defines a longitudinal axis that is aligned with the longitudinal axis of the adapter sleeve such that the shaft sleeve and the shaft are supported at the predetermined angle relative to the longitudinal axis of the hosel.
In another representative embodiment, a golf club assembly comprises a club head having a hosel defining an opening housing a rotation prevention portion, the hosel defining a longitudinal axis. The assembly also comprises a plurality of removable adapter sleeves each configured to be received in the hosel opening, each sleeve having a first rotation prevention portion adapted to mate with the rotation prevention portion of the hosel to restrict relative rotation between the adapter sleeve and the hosel. Each adapter sleeve has a longitudinally extending opening and a second rotation prevention portion in the opening, wherein each adapter sleeve has a longitudinal axis that is angled relative to the longitudinal axis of the hosel at a different predetermined angle. The assembly further comprises a shaft having a lower end portion and a shaft sleeve mounted on the lower end portion of the shaft and adapted to be received in the opening of each adapter sleeve. The shaft sleeve has a respective rotation prevention portion adapted to mate with the second rotation prevention portion of each adapter sleeve to restrict relative rotation between the shaft sleeve and the adapter sleeve in which the shaft sleeve is in inserted. The shaft sleeve defines a longitudinal axis and is adapted to be received in each adapter sleeve such that the longitudinal axis of the shaft sleeve becomes aligned with the longitudinal axis of the adapter sleeve in which it is inserted.
In another representative embodiment, a method of assembling a golf shaft and golf club head having a hosel opening defining a longitudinal axis is provided. The method comprises selecting an adapter sleeve from among a plurality of adapter sleeves, each having an opening adapted to receive a shaft sleeve mounted on the lower end portion of the shaft, wherein each adapter sleeve is configured to support the shaft at a different predetermined orientation relative to the longitudinal axis of the hosel opening. The method further comprises inserting the shaft sleeve into the selected adapter sleeve, inserting the selected adapter sleeve into the hosel opening of the club head, and securing the shaft sleeve, and therefore the shaft, to the club head with the selected adapter sleeve disposed on the shaft sleeve.
In yet another representative embodiment, a golf club head comprises a body having a striking face defining a forward end of the club head, the body also having a read end opposite the forward end. The body also comprises an adjustable sole portion having a rear end and a forward end pivotably connected to the body at a pivot axis, the sole portion being pivotable about the pivot axis to adjust the position of the sole portion relative to the body.
In still another representative embodiment, a golf club assembly comprises a golf club head comprising a body having a striking face defining a forward end of the club head. The body also has a read end opposite the forward end, and a hosel having a hosel opening. The body further comprises an adjustable sole portion having a rear end and a forward end pivotably connected to the body at a pivot axis. The sole portion is pivotable about the pivot axis to adjust the position of the sole portion relative to the body. The assembly further comprises a removable shaft and a removable sleeve adapted to be received in the hosel opening and having a respective opening adapted to receive a lower end portion of the shaft and support the shaft relative to the club head at a desired orientation. A mechanical fastener is adapted to releasably secure the shaft and the sleeve to the club head.
In another representative embodiment, a method of adjusting playing characteristics of a golf club comprises adjusting the square loft of the club by adjusting the orientation of a shaft of the club relative to a club head of the club, and adjusting the face angle of the club by adjusting the position of a sole of the club head relative to the club head body.
In another representative embodiment, a golf club head including a body comprising a face plate positioned at a forward portion of the golf club head, a hosel, a sole positioned at a bottom portion of the golf club head, and a crown positioned at a top portion of the golf club head is described. The body defines an interior cavity and at least 50 percent of the crown has a thickness less than about 0.8 mm. An adjustable loft system is described allowing a maximum loft change of about 0.5 degrees to about 3.0 degrees. At least one weight port is formed in the body and at least one weight is configured to be retained at least partially within at least one of the weight ports.
In still another representative embodiment, a golf club head including a body and an adjustable loft system configured to allow a maximum loft change is described. At least two weight ports are formed in the body having a distance between the at least two weight ports. At least one weight is configured to be retained at least partially within at least one of the weight ports. The at least one weight has a maximum mass and the distance between the at least two weight ports multiplied by the maximum loft change multiplied by the maximum mass of the at least one weight is between about 50 mm·g·degrees and about 6,000 mm·g·degrees.
In yet another representative embodiment, a golf club head including a body and a crown positioned at a top portion of the golf club head is described. The body defines an interior cavity and at least 50 percent of the crown has an areal weight less than 0.4 g/cm2. An adjustable loft system is also described allowing a maximum loft change of about 0.5 degrees to about 3.0 degrees. At least one weight port is formed in the body and at least one weight is configured to be retained at least partially within a weight port. The golf club head can include a composite face insert.
In another representative embodiment, a golf club head including a rotatably adjustable sole piece adapted to be positioned at a plurality of rotational positions with respect to an axis extending through the sole piece is described. This club head includes a releasable locking mechanism configured to lock the sole piece at a selected one of the plurality of rotational positions on the sole.
In another representative embodiment, a golf club head including a generally triangular adjustable sole piece adapted to be positioned at three discrete selectable positions with respect to an axis extending through the sole piece is described. This club head includes a screw adapted to extend through the sole piece and into a threaded opening in the sole of the club head body and configured to lock the sole piece at a selected one of the three positions on the sole.
In another representative embodiment, a golf club head including a rotatably adjustable sole piece adapted to be positioned at a plurality of rotational positions with respect to an axis extending through the sole piece is described. In this embodiment, adjusting the rotational position of the sole piece can change a face angle of the golf club head between about 0.5 and about 12 degrees.
In another representative embodiment, a golf club head is described that includes a recessed cavity in a sole of the golf club head having a platform extending downwardly from a roof of the cavity, and an adjustable sole piece adapted to be at least partially received within the cavity and comprising a body having a plurality of surfaces adapted to contact the platform and being offset from each other along an axis extending through the body. In this embodiment, the sole piece can be positioned at least partially within the cavity at a plurality of rotational and axial positions with respect to the axis. Furthermore, at each rotational position, at least one of the surfaces of the body contacts the platform to set the axial position of the sole piece.
In still another representative embodiment, a golf club is described that includes a club head body comprising hosel and a sole, the sole being positioned at a bottom portion of the club head body and comprising a recessed cavity and a platform extending downwardly from a roof of the cavity. This embodiment also includes an adjustable sole piece adapted to be at least partially received within the cavity and comprising a body having a plurality of surfaces adapted to contact the platform and being offset from each other along an axis extending through the body. In this embodiment, the sole piece can be positioned at least partially within the cavity at a plurality of rotational and axial positions with respect to the axis, wherein at each rotational position, at least one of said surfaces of the body contacts the platform to set the axial position of the sole piece, and whereby adjusting the axial position of the sole piece can thereby change a face angle of the golf club between about 0.5 and about 12 degrees. This embodiment also includes a releasable locking mechanism configured to lock the sole piece at a selected one of the plurality of rotational positions on the sole; a shaft; and a rotatably adjustable sleeve to couple the shaft to the hosel. Rotating the adjustable sleeve relative to the hosel can cause the shaft to extend in a different direction from the hosel, thereby changing a square loft of the golf club. Furthermore, the square loft and the face angle can be adjusted independently of each other.
Some embodiments of a wood-type golf club head comprise a body having a front portion, a rear portion, a toe portion, a heel portion, a sole, and a plurality of ribs positioned on an internal surface of the sole. The plurality of ribs includes a first rib extending from the toe portion in a rearward and heelward direction, a second rib extending from the heel portion in a rearward and toward direction, and a third rib extending from the rear portion in a frontward direction, wherein the first, second and third ribs converge at a convergence location.
In some embodiments, the body further comprises a first weight port positioned at the toe portion and a second weight port positioned at the heel portion, the first rib being connected to the first weight port and the second rib being connected to the second weight port.
In some embodiments, the plurality of ribs comprises a fourth rib extending from the convergence location in a frontward direction.
In some embodiments, the body further comprises a hosel and the plurality of ribs comprises a fourth rib extending between the hosel and the first weight port.
In some embodiments, the convergence location is rearward and heelward of a center of gravity of the golf club head.
In some embodiments, the sole comprises a convergence zone, such as a pocket, that is recessed with respect to a surrounding sole region and the convergence location is positioned above the convergence zone. In some of these embodiments, the first, second and third ribs extend across an internal surface of the convergence zone and across an internal surface of the surrounding sole region. In some of these embodiments, the first, second and third ribs converge at an aperture in the sole, the aperture being at the center of the convergence zone.
In some embodiments, the club head further comprises an adjustable sole piece coupled to an external surface of a pocket via a fastener that passes through the sole piece and is secured to an aperture in the sole. In some of these embodiments, the adjustable sole piece is configured to be positioned at a plurality of axial positions with respect to an axis extending through the sole piece, the adjustable sole piece being releasably lockable to the sole at a selected one of the plurality of axial positions on the sole. In some of these embodiments, the adjustable sole piece has a generally triangular configuration and is adapted to be positioned at three distinct axial positions with respect to the axis extending through the aperture. In some of these embodiments, the adjustable sole piece is configured to receive at least two projections located on the sole.
Some embodiments of a golf club head comprise a body having a sole portion positioned at a bottom portion of the body, the sole portion having a frequency of a first fundamental sole mode that is greater than 2,500 Hz. The club head also comprises a hosel portion positioned at a heel portion of the body, a crown portion located on an upper portion of the body, and a striking face portion located on a front portion of the body. The sole portion comprises a recessed zone that is configured to receive an adjustable sole piece and a surrounding sole region, and at least one rib that extends along a portion of an internal surface of the sole portion. The adjustable sole piece is configured to provide at least a first position associated with at least a first club head face angle, the adjustable sole piece configured to further provide at least a second position associated with at least a second club head face angle, and the adjustable sole piece is configured to receive at least two projections located on the sole.
In some of these embodiments, the body further comprises a weight port positioned at a toe portion of the body, and the one or more ribs positioned on an internal surface of the sole include a first rib that extends along the interior surface of the sole from the hosel to the weight port. The sole portion further comprises a front sole region configured to contact the ground when the golf club head is in an address position, a recessed sole region that is recessed relative to the front sole region such that the recessed sole region is spaced from the ground, and a sloped sole transition zone extending inward from the front sole region to the recessed sole region. The first rib extends from a first portion of the front sole region adjacent the hosel, across a first portion of the sole transition zone adjacent the hosel, across the recessed sole region, across a second portion of the sole transition zone adjacent the weight port, and across a second portion of the front sole region adjacent the weight port. In some of these embodiments, when the golf club head is in the address position, the first rib extends in a straight line when projected onto an X-Y plane parallel with the ground.
In some of these embodiments, the first rib has a height that varies along its length between the hosel and the weight port, a height adjacent the hosel and a height adjacent the weight port being greater than a height where the first rib extends across the recessed sole region.
In some of these embodiments, the adjustable sole piece is capable of being positioned in three discrete positions to adjust the face angle of the club head.
Some embodiments of a golf club comprise a body, a shaft connected to the body, a grip connected to the shaft, a crown portion located on an upper portion of the body, a striking face located on a front portion of the body, and a sole portion located on a bottom portion of the body. The sole portion comprises a recessed zone configured to receive an adjustable sole piece and a surrounding sole region, and at least one rib that extends along a portion of an internal surface of the sole portion. The adjustable sole piece is configured to provide at least a first position associated with at least a first club head face angle, and the adjustable sole piece is configured to further provide at least a second position associated with at least a second club head face angle.
Some of these embodiments further comprise an adjustable sole piece positioned in the recessed zone and a fastener securing the adjustable sole piece to the recessed zone. A portion of the at least one rib extends along a portion of the internal surface of the recessed zone and is positioned within a region directly above the adjustable sole piece when the golf club is in the address position.
In some of these embodiments, the sole portion includes a frequency of a first fundamental sole mode that is greater than 2,500 Hz. In some of these embodiments, the sole portion includes a frequency of a first fundamental sole mode that is greater than 3,000 Hz.
Some embodiments of a golf club head comprise a rotatably adjustable sole piece configured to be secured to the sole at five or more rotational positions with respect to a central axis extending through the sole piece, wherein the sole piece extends a different axial distance from the sole at each of the rotational positions. The adjustable sole piece can be generally pentagonal and can be secured to the sole at five discrete selectable positions. The adjustable sole piece can include an annular side wall that includes at least five wall segments that are substantially symmetrical with one another relative to the central axis of the sole piece. In some embodiments, adjusting the rotational position of the sole piece changes the face angle of the golf club head independently of the loft angle of the golf club head when the golf club head is in the address position.
The golf club head can further comprise a sole positioned at a bottom portion of the golf club head with a recessed sole port in the sole. The rotatably adjustable sole piece can be adapted to be at least partially received within the sole port. The sole piece can comprise a central body having a plurality of surfaces adapted to contact the sole port, the surfaces being offset from each other along a central axis extending through the central body. The sole piece can be positioned at least partially within the sole port at five or more rotational and axial positions with respect to the central axis. At each rotational position, at least one of the surfaces of the central body contacts the sole port to set the axial position of the sole piece. The sole port and the sole piece can each be generally pentagonal when viewed from the bottom of the golf club head.
Some embodiments of a golf club head comprise a body having a face, a crown and a sole together defining an interior cavity, the body having a channel located on the sole and extending generally from a heel end of the body to a toe end of the body. The distance between a first vertical plane intersecting a center of the face and a second vertical plane bisecting the channel is less than about 50 mm over a full length of the channel. A weight member can be movably positioned within the channel such that a position of the weight member within the channel is able to be adjusted.
In some of these embodiments, the distance between the first vertical plane and the second vertical plane is less than about 40 mm over a full length of the channel. In still other embodiments, the distance between the first vertical plane and the second vertical plane is less than about 30 mm over a full length of the channel.
In some of these embodiments, a ledge extends within the channel from the heel end of the body to the toe end of the body. The ledge can include a plurality of locking projections located on an exposed surface of the ledge. In some of these embodiments, the weight member includes an outer member retained within the channel and in contact with the ledge, an inner member retained within the channel, and a fastening bolt that connects the outer member to the inner member. In some of these embodiments, the outer member includes a plurality of locking notches adapted to selectively engage the locking projections located on the exposed surface of the ledge. In some of these embodiments, the outer member has a length L extending generally in the heel to toe direction of the channel, and each adjacent pair of locking projections are separated by a distance D1 along the ledge, with L>D1.
In some of these embodiments, a rotatably adjustable sole piece is secured to the sole at one of a plurality of rotational positions with respect to a central axis extending through the sole piece. The sole piece extends a different axial distance from the sole at each of the rotational positions. Adjusting the sole piece to a different one of the rotational positions changes the face angle of the golf club head independently of the loft angle of the golf club head when the golf club head is in the address position. In some of these embodiments, a releasable locking mechanism is configured to lock the sole piece at a selected one of the rotational positions on the sole. The locking mechanism can include a screw adapted to extend through the sole piece and into a threaded opening in the sole of the club head body. In some of these embodiments, the sole piece has a convex bottom surface, such that when the sole piece is at each rotational position the bottom surface has a heel-to-toe curvature that substantially matches a heel-to-toe curvature of a leading contact surface of the sole.
Some embodiments of a golf club head include a body having a face, a crown and a sole together defining an interior cavity, the body having a channel located on the sole and extending generally from a heel end of the body to a toe end of the body. A weight member can be movably positioned within the channel such that a position of the weight member within the channel is able to be adjusted. The face includes a center face location that defines the origin of a coordinate system in which an x-axis is tangential to the face at the center face location and is parallel to a ground plane when the body is in a normal address position, a y-axis extends perpendicular to the x-axis and is also parallel to the ground plane, and a z-axis extends perpendicular to the ground plane, wherein a positive x-axis extends toward the heel portion from the origin, a positive y-axis extends rearwardly from the origin, and a positive z-axis extends upwardly from the origin. A maximum x-axis position adjustment range of the weight member (Max Δx) is greater than 50 mm and a maximum y-axis position adjustment range of the weight member Max Δy) is less than 40 mm.
In some of these embodiments, the weight member has a mass (MWA) and the product of MWA*Max Δx is at least 250 g·mm, such as between about 250 g·mm and about 4950 g·mm.
In some of these embodiments, the product of MWA*Max Δy is less than 1800 g·mm, such as between about 0 g·mm and about 1800 g·mm.
In some of these embodiments, a center of gravity of the body has a z-axis coordinate (CGZ) that is less than about 0 mm.
Some embodiments of a golf club head include a body having a face, a crown and a sole together defining an interior cavity, the body having a channel located on the sole and extending generally from a heel end of the body to a toe end of the body. A weight member can be movably positioned within the channel such that a position of the weight member within the channel is able to be adjusted, thereby adjusting a location of a center of gravity of the body. The face includes a center face location that defines the origin of a coordinate system in which an x-axis is tangential to the face at the center face location and is parallel to a ground plane when the body is in a normal address position, a y-axis extends perpendicular to the x-axis and is also parallel to the ground plane, and a z-axis extends perpendicular to the ground plane, wherein a positive x-axis extends toward the heel portion from the origin, a positive y-axis extends rearwardly from the origin, and a positive z-axis extends upwardly from the origin. Adjustment of the weight member can provide a maximum x-axis adjustment range of the position of the center of gravity (Max ΔCGx) that is greater than 2 mm and a maximum y-axis adjustment range of the center of gravity (Max ΔCGy) that is less than 3 mm.
In some of these embodiments, a center of gravity of the body has a z-axis coordinate (CGz) that is less than about 0 mm.
The foregoing and other features and advantages of the invention will become more apparent from the following detailed description, which proceeds with reference to the accompanying figures.
The inventive features include all novel and non-obvious features disclosed herein both alone and in novel and non-obvious combinations with other elements. As used herein, the phrase “and/or” means “and”, “or” and both “and” and “or”. As used herein, the singular forms “a,” “an,” and “the” refer to one or more than one, unless the context clearly dictates otherwise. As used herein, the term “includes” means “comprises.”
Referring first to
Both HSS and WSS are determined using the striking face curve (SSS). The striking face curve is bounded on its periphery by all points where the face transitions from a substantially uniform bulge radius (face heel-to-toe radius of curvature) and a substantially uniform roll radius (face crown-to-sole radius of curvature) to the body (see e.g.,
As shown in
As shown in
As shown in
The lie angle 10 and/or the shaft loft can be modified by adjusting the position of the shaft 50 relative to the club head. Traditionally, adjusting the position of the shaft has been accomplished by bending the shaft and the hosel relative to the club head. As shown in
Adjusting the shaft loft is effective to adjust the square loft of the club by the same amount. Similarly, when shaft loft is adjusted and the club head is placed in the address position, the face angle of the club head increases or decreases in proportion to the change in shaft loft. Hence, shaft loft is adjusted to effect changes in square loft and face angle. In addition, the shaft and the hosel can be bent to adjust the lie angle and the shaft loft (and therefore the square loft and the face angle) by bending the shaft and the hosel in a first direction inward or outward relative to the club head to adjust the lie angle and in a second direction forward or rearward relative to the club head to adjust the shaft loft.
Now with reference to
By way of example, the club head 300 comprises the head of a “wood-type” golf club. All of the embodiments disclosed in the present specification can be implemented in all types of golf clubs, including but not limited to, drivers, fairway woods, utility clubs, putters, irons, wedges, etc.
As used herein, a shaft that is “removably attached” to a club head means that the shaft can be connected to the club head using one or more mechanical fasteners, such as a screw or threaded ferrule, without an adhesive, and the shaft can be disconnected and separated from the head by loosening or removing the one or more mechanical fasteners without the need to break an adhesive bond between two components.
The sleeve 100 is mounted to a lower, or tip end portion 90 of the shaft 50. The sleeve 100 can be adhesively bonded, welded or secured in equivalent fashion to the lower end portion of the shaft 50. In other embodiments, the sleeve 100 may be integrally formed as part of the shaft 50. As shown in
As best shown in
To restrict rotational movement of the shaft 50 relative to the head 300 when the club head 300 is attached to the shaft 50, the sleeve 100 has a rotation prevention portion that mates with a complementary rotation prevention portion of the insert 200. In the illustrated embodiment, for example, the shaft sleeve has a lower portion 150 having a non-circular configuration complementary to a non-circular configuration of the hosel insert 200. In this way, the sleeve lower portion 150 defines a keyed portion that is received by a keyway defined by the hosel insert 200. In particular embodiments, the rotational prevention portion of the sleeve comprises longitudinally extending external splines 500 formed on an external surface 160 of the sleeve lower portion 150, as illustrated in
In the illustrated embodiment of
It is desirable that a golf club employing a removable club head-shaft connection assembly as described in the present application have substantially similar weight and distribution of mass as an equivalent conventional golf club so that the golf club employing a removable shaft has the same “feel” as the conventional club. Thus, it is desired that the various components of the connection assembly (e.g., the sleeve 100, the hosel insert 200 and the screw 400) are constructed from light-weight, high-strength metals and/or alloys (e.g., T6 temper aluminum alloy 7075, grade 5 6A1-4V titanium alloy, etc.) and designed with an eye towards conserving mass that can be used elsewhere in the golf club to enhance desirable golf club characteristics (e.g., increasing the size of the “sweet spot” of the club head or shifting the center of gravity to optimize launch conditions).
The golf club having an interchangeable shaft and club head as described in the present application provides a golfer with a club that can be easily modified to suit the particular needs or playing style of the golfer. A golfer can replace the club head 300 with another club head having desired characteristics (e.g., different loft angle, larger face area, etc.) by simply unscrewing the screw 400 from the sleeve 100, replacing the club head and then screwing the screw 400 back into the sleeve 100. The shaft 50 similarly can be exchanged. In some embodiments, the sleeve 100 can be removed from the shaft 50 and mounted on the new shaft, or the new shaft can have another sleeve already mounted on or formed integral to the end of the shaft.
In particular embodiments, any number of shafts are provided with the same sleeve and any number of club heads is provided with the same hosel configuration and hosel insert 200 to receive any of the shafts. In this manner, a pro shop or retailer can stock a variety of different shafts and club heads that are interchangeable. A club or a set of clubs that is customized to suit the needs of a consumer can be immediately assembled at the retail location.
With reference now to
As shown in
As noted above, the rotation prevention portion of the sleeve 100 for restricting relative rotation between the shaft and the club comprises a plurality of external splines 500 formed on an external surface of the lower portion 150 and gaps, or keyways, between adjacent splines 500. Each keyway has an outer surface 160. In the illustrated embodiment of
For example, various Rosch-manufacturing techniques (e.g., rotary, thru-broach or blind-broach) may not be suitable for manufacturing sleeves or hosel inserts having more, smaller splines. In some embodiments, the splines 500 have a spline height H of between about 0.15 mm to about 1.0 mm with a height H of about 0.5 mm being a specific example and a spline width W1 of between about 0.979 mm to about 2.87 mm, with a width W1 of about 1.367 mm being a specific example.
The non-circular configuration of the sleeve lower portion 150 can be adapted to limit the manner in which the sleeve 100 is positionable within the hosel insert 200. In the illustrated embodiment of
The sleeve lower portion 150 can have a generally rougher outer surface relative to the remaining surfaces of the sleeve 100 in order to provide, for example, greater friction between the sleeve 100 and the hosel insert 200 to further restrict rotational movement between the shaft 50 and the club head 300. In particular embodiments, the external surface 160 can be roughened by sandblasting, although alternative methods or techniques can be used.
The general configuration of the sleeve 100 can vary from the configuration illustrated in
With reference now to
With reference to the features of
Selected surfaces of the hosel insert 200 can be roughened in a similar manner to the exterior surface 160 of the shaft. In some embodiments, the entire surface area of the insert can be provided with a roughened surface texture. In other embodiments, only the inner surface 240 of the hosel insert 200 can be roughened.
With reference now to
The head 410 of the screw can be configured to be compatible with a torque wrench or other torque-limiting mechanism. In some embodiments, the screw head comprises a “hexalobular” internal driving feature (e.g., a TORX screw drive) (such as shown in
The club head-shaft connection desirably has a low axial stiffness. The axial stiffness, k, of an element is defined as
where E is the Young's modulus of the material of the element, A is the cross-sectional area of the element and L is the length of the element. The lower the axial stiffness of an element, the greater the element will elongate when placed in tension or shorten when placed in compression. A club head-shaft connection having low axial stiffness is desirable to maximize elongation of the screw 400 and the sleeve, allowing for greater preload to be applied to the screw 400 for better retaining the shaft to the club head. For example, with reference to
The axial stiffness of the club head-shaft connection, keff, can be determined by the equation
where kscrew, kshaft and ksleeve are the stiffnesses of the screw, shaft, and sleeve, respectively, over the portions that have associated lengths Lscrew, Lshaft, and Lsleeve, respectively, as shown in
Accordingly, kscrew, kshaft and ksleeve can be determined using the lengths in Equation 1. Table 1 shows calculated k values for certain components and combinations thereof for the connection assembly of
The components of the connection assembly can be modified to achieve different values. For example, the screw 400 can be longer than shown in
In the illustrated embodiment of
In certain embodiments, a shaft sleeve can have 4, 6, 8, 10, or 12 splines. The height H of the splines of the shaft sleeve in particular embodiments can range from about 0.15 mm to about 0.95 mm, and more particularly from about 0.25 mm to about 0.75 mm, and even more particularly from about 0.5 mm to about 0.75 mm. The average diameter D of the spline portion of the shaft sleeve can range from about 6 mm to about 12 mm, with 8.45 mm being a specific example. As shown in
The length L of the splines of the shaft sleeve in particular embodiments can range from about 2 mm to about 10 mm. For example, when the connection assembly is implemented in a driver, the splines can be relatively longer, for example, 7.5 mm or 10 mm. When the connection assembly is implemented in a fairway wood, which is typically smaller than a driver, it is desirable to use a relatively shorter shaft sleeve because less space is available inside the club head to receive the shaft sleeve. In that case, the splines can be relatively shorter, for example, 2 mm or 3 mm in length, to reduce the overall length of the shaft sleeve.
The ratio of spline width W1 (at the midspan of the spline) to average diameter of the spline portion of the shaft sleeve in particular embodiments can range from about 0.1 to about 0.5, and more desirably, from about 0.15 to about 0.35, and even more desirably from about 0.16 to about 0.22. The ratio of spline width W1 to spline H in particular embodiments can range from about 1.0 to about 22, and more desirably from about 2 to about 4, and even more desirably from about 2.3 to about 3.1. The ratio of spline length L to average diameter in particular embodiments can range from about 0.15 to about 1.7.
Tables 2-4 below provide dimensions for a plurality of different spline configurations for the sleeve 100 (and other shaft sleeves disclosed herein). In Table 2, the average radius R is the radius of the spline portion of a shaft sleeve measured at the mid-span of a spine, i.e., at a location equidistant from the base of the spline at surface 160 and to the outer surface 550 of the spline (see
Table 2 shows the spline arc angle, average radius, average diameter, arc length, arc length, arc length/average radius ratio, width at midspan, width (at midspan)/average diameter ratio for different shaft sleeves having 8 splines (with two 33 degree gaps as shown in
The specific dimensions provided in the present specification for the shaft sleeve 100 (as well as for other components disclosed herein) are given to illustrate the invention and not to limit it. The dimensions provided herein can be modified as needed in different applications or situations.
Now with reference to
The shaft sleeve 900 can be adhesively bonded, welded or secured in equivalent fashion to the lower end portion of the shaft 800. In other embodiments, the shaft sleeve 900 may be integrally formed with the shaft 800. As best shown in
Rotational movement of the shaft 800 relative to the club head 700 can be restricted by restricting rotational movement of the shaft sleeve 900 relative to the hosel sleeve 1000 and by restricting rotational movement of the hosel sleeve 1000 relative to the club head 700. To restrict rotational movement of the shaft sleeve 900 relative to the hosel sleeve 1000, the shaft sleeve has a lower, rotation prevention portion 950 having a non-circular configuration that mates with a complementary, non-circular configuration of a lower, rotation prevention portion 1096 inside the hosel sleeve 1000. The rotation prevention portion of the shaft sleeve 900 can comprise longitudinally extending splines 1400 formed on an external surface 960 of the lower portion 950, as best shown in
To restrict rotational movement of the hosel sleeve 1000 relative to the club head 700, the hosel sleeve 1000 can have a lower, rotation prevention portion 1050 having a non-circular configuration that mates with a complementary, non-circular configuration of a rotation prevention portion of the hosel insert 1100. The rotation prevention portion of the hosel sleeve can comprise longitudinally extending splines 1500 formed on an external surface 1090 of a lower portion 1050 of the hosel sleeve 1000, as best shown in
Accordingly, the shaft sleeve lower portion 950 defines a keyed portion that is received by a keyway defined by the hosel sleeve inner surface 1096, and hosel sleeve outer surface 1050 defines a keyed portion that is received by a keyway defined by the hosel insert inner surface 1140. In alternative embodiments, the rotation prevention portions can be elliptical, rectangular, hexagonal or other non-circular complementary configurations of the shaft sleeve lower portion 950 and the hosel sleeve inner surface 1096, and the hosel sleeve outer surface 1050 and the hosel insert inner surface 1140.
Referring to
The hosel sleeve 1000 is configured to support the shaft 50 at a desired orientation relative to the club head to achieve a desired shaft loft and/or lie angle for the club. As best shown in
Consequently, the hosel sleeve 1000 can be positioned in the hosel insert 1100 in one or more positions to adjust the shaft loft and/or lie angle of the club. For example,
Referring to
Similarly, the shaft sleeve 900 can be inserted into the hosel sleeve at various angularly spaced positions around longitudinal axis A. Consequently, if the orientation of the shaft relative to the club head is adjusted by rotating the position of the hosel sleeve 1000, the position of the shaft sleeve within the hosel sleeve can be adjusted to maintain the rotational position of the shaft relative to longitudinal axis A. For example, if the hosel sleeve is rotated 90 degrees with respect to the hosel insert, the shaft sleeve can be rotated 90 degrees in the opposite direction with respect to the hosel sleeve in order to maintain the position of the shaft relative to its longitudinal axis. In this manner, the grip of the shaft and any visual indicia on the shaft can be maintained at the same position relative to the shaft axis as the shaft loft and/or lie angle is adjusted.
In another example, a connection assembly can employ a hosel sleeve that is positionable at eight angularly spaced positions within the hosel insert 1100, as represented by cross hairs A1-A8 in
The connection assembly embodiment illustrated in
Thus, the use of a hosel sleeve in the shaft-head connection assembly allows the golfer to adjust the position of the shaft relative to the club head without having to resort to such traditional methods such as bending the shaft relative to the club head as described above. For example, consider a golf club utilizing the club head-shaft connection assembly of
In particular embodiments, the replacement hosel sleeves could be purchased individually from a retailer. In other embodiments, a kit comprising a plurality of hosel sleeves, each having a different offset angle can be provided. The number of hosel sleeves in the kit can vary depending on a desired range of offset angles and/or a desired granularity of angle adjustments. For example, a kit can comprise hosel sleeves providing offset angles from 0 degrees to 3 degrees, in 0.5 degree increments.
In particular embodiments, hosel sleeve kits that are compatible with any number of shafts and any number of club heads having the same hosel configuration and hosel insert 1100 are provided. In this manner, a pro shop or retailer need not necessarily stock a large number of shaft or club head variations with various loft, lie and/or face angles. Rather, any number of variations of club characteristic angles can be achieved by a variety of hosel sleeves, which can take up less retail shelf and storeroom space and provide the consumer with a more economic alternative to adjusting loft, lie or face angles (i.e., the golfer can adjust a loft angle by purchasing a hosel sleeve instead of a new club).
With reference now to
The shaft sleeve 900 further comprises an opening 994 extending the length of the shaft sleeve 900, as depicted in
In particular embodiments, the rotation prevention portion of the shaft sleeve comprises a plurality of splines 1400 on an external surface 960 of the lower portion 950 that are elongated in the direction of the longitudinal axis of the shaft sleeve 900, as shown in
With reference now to
The hosel sleeve 1000 further comprises an opening 1040 extending the length of the hosel sleeve 1000. The hosel sleeve opening 1040 has an upper portion 1094 with internal sidewalls 1095 that are complementary configured to the configuration of the shaft sleeve middle portion 910, and a lower portion 1096 defining a rotation prevention portion having a non-circular configuration complementary to the configuration of shaft sleeve lower portion 950.
The non-circular configuration of the hosel sleeve lower portion 1096 comprises a plurality of splines 1600 formed on an inner surface 1650 of the opening lower portion 1096. With reference to
The external surface of the lower portion 1050 defines a rotation prevention portion comprising four splines 1500 elongated in the direction of and are parallel to longitudinal axis B defined by the external surface of the lower portion, as depicted in
The splined configuration of the shaft sleeve 900 dictates the degree to which the shaft sleeve 900 is positionable within the hosel sleeve 1000. In the illustrated embodiment of
The external surface of the shaft sleeve lower portion 950, the internal surface of the hosel sleeve opening lower portion 1096, the external surface of the hosel sleeve lower portion 1050, and the internal surface of the hosel insert can have generally rougher surfaces relative to the remaining surfaces of the shaft sleeve 900, the hosel sleeve 1000 and the hosel insert. The enhanced surface roughness provides, for example, greater friction between the shaft sleeve 900 and the hosel sleeve 1000 and between the hosel sleeve 1000 and the hosel insert 1100 to further restrict relative rotational movement between these components. The contacting surfaces of shaft sleeve, the hosel sleeve and the hosel insert can be roughened by sandblasting, although alternative methods or techniques can be used.
With reference now to
With reference now to
The head 1330 of the screw 1300 can be similar to the head 410 of the screw 400 (
As best shown in
For example, in the illustrated embodiment of
The hosel opening 3004 is also adapted to receive a hosel insert 200 (described in detail above), which can be positioned on an annular shoulder 3012 inside the club head. The hosel insert 200 can be secured in place by welding, an adhesive, or other suitable techniques. Alternatively, the insert can be integrally formed in the hosel opening. The club head 3000 further includes an opening 3014 in the bottom or sole of the club head that is sized to receive a screw 400. Much like the embodiment shown in
If desired, a screw capturing device, such as in the form of an o-ring or washer 3036, can be placed on the shaft of the screw 400 above shoulder 3012 to retain the screw in place within the club head when the screw is loosened to permit removal of the shaft from the club head. The ring 3036 desirably is dimensioned to frictionally engage the threads of the screw and has an outer diameter that is greater than the central opening in shoulder 3012 so that the ring 3036 cannot fall through the opening. When the screw 400 is tightened to secure the shaft to the club head, as depicted in
The shaft sleeve 3006 is shown in greater detail in
Unlike the embodiment shown in
As best shown in
As further shown in
Other shaft sleeve and hosel insert configurations can be used to vary the number of possible angular positions for the shaft sleeve relative to the longitudinal axis B.
As can be appreciated, the assembly shown in
The shaft sleeve 3056 has a lower portion 3058 including splines that mate with the splines of the hosel insert 200, an intermediate portion 3060 and an upper head portion 3062. The intermediate portion 3060 and the head portion 3062 define an internal bore 3064 for receiving the tip end portion of the shaft. In the illustrated embodiment, the intermediate portion 3060 of the shaft sleeve has a cylindrical external surface that is concentric with the inner cylindrical surface of the hosel opening 3054. In this manner, the lower and intermediate portions 3058, 3060 of the shaft sleeve and the hosel opening 3054 define a longitudinal axis B. The bore 3064 in the shaft sleeve defines a longitudinal axis A to support the shaft along axis A, which is offset from axis B by a predetermined angle 3066 determined by the bore 3064. As described above, inserting the shaft sleeve 3056 at different angular positions relative to the hosel insert 200 is effective to adjust the shaft loft and/or the lie angle.
In this embodiment, because the intermediate portion 3060 is concentric with the hosel opening 3054, the outer surface of the intermediate portion 3060 can contact the adjacent surface of the hosel opening, as depicted in
The previously disclosed “head-shaft connection assembly” and “adjustable lie/loft connection assembly” may be non-metallic, or incorporate non-metallic components. In fact, this section applies to any of the shaft sleeves disclosed herein, however references in this section will be made to shaft sleeve 100 merely for simplicity. Now, with reference now to
The primary portion 10000 has a primary portion proximal end 10010, a primary portion distal end 10020, a primary portion axis 10030, a primary portion shaft bore 10040 for receiving and mounting the shaft, a primary portion volume, and a primary portion overlap region 10050. The primary portion 10000 is formed of a primary portion non-metallic material having a primary portion density of less than 2 grams per cubic centimeter, a primary portion tensile strength of at least 150 megapascal, and a primary portion percent elongation to break. References to tensile strength in this “Non-metallic Connection Assembly” section refer to ultimate tensile strength.
Further, the secondary portion 11000 has a secondary portion proximal end 11010, a secondary portion distal end 11020, a secondary portion length 11025, a secondary portion axis 11030, a secondary portion bore 11040, and a secondary portion volume. The secondary portion 11000 is formed of a secondary portion metallic material having a secondary portion density that is greater than the primary portion density, a secondary portion tensile strength that is greater than the primary portion tensile strength, and a secondary portion percent elongation to break.
The connection assembly may include a screw, or other fastening device, to releasably join the shaft sleeve 100 and the club head. The screw may have a screw head and an externally threaded screw shaft extending from the screw head, wherein the secondary portion bore 11040 is releasably securable to the club head by inserting the screw through the lower opening and tightening the screw into the secondary portion bore 11040. Alternatively, as will be disclosed later with respect to a family of embodiments in which the shaft sleeve is constructed only of a primary portion 10000, the screw may be inserted through the lower opening and tightened directly into a bore in the primary portion. The screw is formed of a screw material having a screw material density, a screw material tensile strength, and a screw material percent elongation to break.
When the shaft sleeve 100 includes multiple materials, in this embodiment a non-metallic primary portion 10000 and a metallic secondary portion 11000, it has been discovered that strain relationships, and therefore relationships among the materials' properties of percent elongation to break, are much more significant than traditional design practices of simply designing the shaft sleeve 100 to be as strong as possible within weight constraints. In fact, applying such design practices to the design of non-metallic primary portion 10000 leads to a part formed of material having a high ultimate tensile strength, which is generally plagued by an elongation to break material property of 3.5% or less, and more commonly of 2.5% or less. Testing revealed that such a design has a high probability to fail during impact testing of the connection assembly, which often consists of 5000 off-center impacts of a golf ball striking the face, at multiple locations, at a velocity of 52 m/s.
However, multi-material shaft sleeve 100 designs focused on unique strain relationships, and more specifically the percent elongation to break, of the different materials, rather than simply ultimate tensile strength, have proven to meet stringent off-center impact durability testing. In one such embodiment the overwhelming majority of the shaft sleeve 100 is formed of non-metallic material, in fact the volume of the primary portion 10000 is at least five times the volume of the secondary portion 11000, and yet preferential durability characteristics are obtained because the percent elongation to break of the material forming the primary portion 10000, i.e. the primary portion percent elongation to break, is at least four percent, and it is (a) at least twenty-five percent of the secondary portion percent elongation to break, and (b) at least twenty-five percent of the screw material percent elongation to break.
Another embodiment exhibiting improved impact durability has a primary portion percent elongation to break that is at least fifty percent of the secondary portion percent elongation to break. In an even further embodiment the elongation relationships further incorporate the tensile loaded screw element, wherein the primary portion percent elongation to break is at least fifty percent of the screw material percent elongation to break. Still further, preferential durability characteristics have been found in an embodiment in which the primary portion percent elongation to break is less than the secondary portion percent elongation to break, while in an even further embodiment the secondary portion percent elongation to break is less than the screw material percent elongation to break.
While the secondary portion density is greater than the primary portion density, in one embodiment the secondary portion density is at least 2 grams per cubic centimeter, the secondary portion tensile strength is at least 250 megapascal, and the primary portion tensile strength is at least forty percent of secondary portion tensile strength. While in an even further embodiment the screw material tensile strength is at least fifty percent greater than secondary portion tensile strength, thereby providing a three material connection assembly possessing unique relationships among the three materials to achieve the desired durability.
Even further, in another embodiment durability is further enhanced when the primary portion percent elongation to break is at least six percent, the secondary portion percent elongation to break is at least nine percent, and the screw material percent elongation to break is at least nine percent; while another embodiment has a primary portion percent elongation to break that is 50-80% of the secondary portion percent elongation to break. Another way of expressing these unique relationships providing preferred durability is via the product of the primary portion percent elongation to break and the primary portion tensile strength in megapascal, referred to as the primary portion product. In one such embodiment the primary portion product is greater than 800, while in a further embodiment the product is greater than 1000, and greater than 1250 in a further embodiment, and greater than 1500 in yet another embodiment. One particularly durable embodiment is constructed of material having the primary product between 1250-2000, while in another embodiment the product is between 1250-1750. Likewise, a product of the secondary portion percent elongation to break and the secondary portion tensile strength in megapascal is referred to as the secondary portion product. In one such embodiment the secondary portion product is greater than 1000, while in a further embodiment the product is greater than 1500, and greater than 2000 in a further embodiment, and greater than 5000 in yet another embodiment. One particularly durable embodiment is constructed when the secondary portion product is greater than the primary portion product; while in another embodiment the secondary portion product is at least twice the primary portion product.
Unlike prior connection assemblies that may incorporate a small non-metallic aspect subject to little, or no, loading, the volume of the primary portion 10000 is at least five times the volume of the secondary portion 11000, and the non-metallic primary portion 10000 receives the shaft and substantial load carrying requirements. In fact, in one embodiment the non-metallic primary portion 10000 includes the upper annular thrust surface 130, seen best in
In one embodiment the strain relationships are achieved by having the primary portion 10000 formed of a polyamide resin, while in a further embodiment the polyamide resin includes fiber reinforcement, and in yet another embodiment the polyamide resin includes at least 35% fiber reinforcement. In one such embodiment the fiber reinforcement includes long-glass fibers having a length of at least 10 millimeters pre-molding and produce a finished primary portion 10000 having fiber lengths of at least 3 millimeters, while another embodiment includes fiber reinforcement having short-glass fibers with a length of at least 0.5-2.0 millimeters pre-molding. Incorporation of the fiber reinforcement increases the tensile strength of the primary portion 10000, however it may also reduces the primary portion elongation to break therefore a careful balance must be struck to maintain sufficient elongation. Therefore, one embodiment includes 35-55% long fiber reinforcement, while in an even further embodiment has 40-50% long fiber reinforcement. One specific example is a long-glass fiber reinforced polyamide 66 compound with 40% carbon fiber reinforcement, such as the XuanWu XW5801 resin having a tensile strength of 245 megapascal and 7% elongation at break. Long fiber reinforced polyamides, and the resulting melt properties, produce a more isotropic material than that of short fiber reinforced polyamides, primarily due to the three-dimensional network formed by the long fibers developed during injection molding. Another advantage of long-fiber material is the almost linear behavior through to fracture resulting in less deformation at higher stresses. In one particular embodiment the primary portion 10000 is formed of a polycaprolactam, a polyhexamethylene adipinamide, or a copolymer of hexamethylene diamine adipic acid and caprolactam, however other embodiments may include polypropylene (PP), nylon 6 (polyamide 6), polybutylene terephthalates (PBT), thermoplastic polyurethane (TPU), PC/ABS alloy, PPS, PEEK, and semi-crystalline engineering resin systems that meet the claimed mechanical properties. In another embodiment the primary portion 10000 is injection molded and is formed of a material having a high melt flow rate, namely a melt flow rate (275°/2.16 Kg), per ASTM D1238, of at least 10 g/10 min. A further embodiment is formed of a primary portion non-metallic material having a primary portion density of less than 1.75 grams per cubic centimeter and a primary portion tensile strength of at least 200 megapascal; while another embodiment has a primary portion density of less than 1.50 grams per cubic centimeter and a primary portion tensile strength of at least 250 megapascal. A further embodiment is formed of a secondary portion metallic material having a secondary portion density of 1.8-3.0 grams per cubic centimeter and a secondary portion tensile strength that is greater than the primary portion tensile strength and at least 200 megapascal, while still maintaining a secondary portion percent elongation to break that is 75-200% of the primary portion percent elongation to break. While in yet a further embodiment the secondary portion metallic material has a secondary portion density of 1.8-3.0 grams per cubic centimeter and a secondary portion tensile strength that is greater than the primary portion tensile strength and at least 250 megapascal, while still maintaining a secondary portion percent elongation to break that is 100-185% of the primary portion percent elongation to break; and in an even further embodiment the secondary portion metallic material has a secondary portion density of 2.5-4.5 grams per cubic centimeter and a secondary portion tensile strength is at least 475 megapascal, while maintaining a secondary portion percent elongation to break that is 115-165% of the primary portion percent elongation to break
Some examples of metals and metal alloys that can be used to form the secondary portion 11000 include, without limitation, magnesium alloys, aluminum/aluminum alloys (e.g., 3000 series alloys, 5000 series alloys, 6000 series alloys, such as 6061-T6, and 7000 series alloys, such as 7075), titanium alloys (e.g., 3-2.5, 6-4, SP700, 15-3-3-3, 10-2-3, or other alpha/near alpha, alpha-beta, and beta/near beta titanium alloys), carbon steels (e.g., 1020 or 8620 carbon steel), stainless steels (e.g., 304 or 410 stainless steel), PH (precipitation-hardenable) alloys (e.g., 17-4, C450, or C455 alloys), copper alloys, and nickel alloys.
The primary portion 10000 and the secondary portion 11000 may be attached to one another using any attachment method that provides the required durability. In one particularly effective attachment method embodiment, seen in
Now referencing
In one embodiment the translation resistant surface 11200 projects outward from the secondary portion interface surface 11100 a translation resistant surface projection distance 11210, seen in
Likewise, the rotation resistant surface 11300 may project outward or inward from the secondary portion interface surface 11100. In one embodiment the rotation resistant surface 11300 projects outward, as seen in
Further, as seen in the embodiments of
The secondary portion 11000 may include multiple translation resistant flanges 11240. For example, the embodiment of
In one embodiment the length from the primary portion proximal end 10010 to the primary portion distal end 10020 is at least 40 millimeters and includes a ferrule 52, seen in
Another embodiment ensures preferred load distribution within the sleeve 100 by controlling the distance from the primary portion shaft bore 10040 to the secondary portion proximal end 11010. As seen in
In addition to, or in lieu of, the translation resistant surface 11200 and/or the rotation resistant surface 11300, the secondary portion 11000 may include an interlocking recess 11400 is formed in the secondary portion interface surface 11100 and extending an interlocking recess depth 11410 inward toward the secondary portion axis 11030, as seen in
The interlocking recess 11400 has an interlocking recess length 11420 and an interlocking recess width 11430, as seen in
As seen in
Up to this point the “Non-metallic Connection Assembly” discussion has focused on a primary portion 10000 formed of a non-metallic material and a secondary portion 11000 formed of a metallic material, however in another family of embodiments the entire shaft sleeve 100 is formed solely of a non-metallic primary portion 10000 without a metallic portion, although it may include multiple non-metallic pieces joined to form the non-metallic primary portion 10000 and thus may include a non-metallic secondary portion 11000. In one particular embodiment the primary portion 10000 is an integrally formed single piece non-metallic primary portion 10000. All of the disclosure applies equally to this family of embodiments, however a preferred embodiment further increases the primary portion tensile strength to at least 200 megapascal and increases the minimum primary portion percent elongation to break to at least five percent, while maintaining the minimum primary portion percent elongation to break of at least twenty-five percent of the screw material percent elongation to break, and having a primary portion density of less than 1.75 grams per cubic centimeter, while also incorporating an integral ferrule 52, and, in some embodiments, integral rotational prevention elements, which may include the disclosed splines 500. In an even further embodiment the primary portion tensile strength is at least 220 megapascal, the minimum primary portion percent elongation to break is at least six percent, and the primary portion density is less than 1.65 grams per cubic centimeter; and yet another embodiment has the primary portion tensile strength of at least 240 megapascal, the minimum primary portion percent elongation to break of at least seven percent, and the primary portion density is less than 1.50 grams per cubic centimeter.
In this non-metallic primary portion 10000 family of embodiments of the shaft sleeve 100, the necessary strain and elongation requirements for durability must be balanced with the need for strength and durability in the connection with the screw and the connection with the shaft. As previously discussed, traditional design practices of simply designing the shaft sleeve 100 to be as strong as possible does not provide the needed durability in an entirely non-metallic embodiment of the shaft sleeve 100. In fact, applying such design practices to the design of non-metallic primary portion 10000 leads to a part formed of material having a high ultimate tensile strength, but one that is generally plagued by an elongation to break material property of 3.5% or less, and more commonly of 2.5% or less. However, a non-metallic shaft sleeve 100 design focused on strain, rather than stress, and more specifically the percent elongation to break, rather than simply ultimate tensile strength, offers improved durability, particularly when the primary portion 10000 incorporates an integral ferrule 52 and has a volume of at least 3 cubic centimeters. Another way of expressing these unique relationships providing preferred durability is via the product of the primary portion percent elongation to break and the primary portion tensile strength in megapascal, referred to as the primary portion product. In one such embodiment the primary portion product is greater than 800, while in a further embodiment the product is greater than 1000, and greater than 1250 in a further embodiment, and greater than 1500 in yet another embodiment. One particularly durable embodiment has a primary portion product between 1250-2000, while in another embodiment the product is between 1250-1750.
Such non-metallic shaft sleeve 100 embodiments focused on unique strain relationships, and more specifically the percent elongation to break, rather than simply ultimate tensile strength, have proven to meet stringent off-center impact durability testing. Preferential durability characteristics have been found in an embodiment in which the primary portion percent elongation to break is less than the screw material percent elongation to break. While in an even further embodiment the screw material tensile strength is at least fifty percent greater than primary portion tensile strength, thereby providing an assembly possessing unique relationships among the materials to achieve the desired durability. Even further, in another embodiment durability is further enhanced when the primary portion percent elongation to break is at least six percent, and the screw material percent elongation to break is at least nine percent
Unlike prior connection assemblies that may incorporate a small non-metallic aspect subject to little, or no, loading, the volume of the primary portion 10000 is at least is at least 3.0 cubic centimeters, and the non-metallic primary portion 10000 receives the shaft and substantial load carrying requirements. In fact, in one embodiment the non-metallic primary portion 10000 includes the upper annular thrust surface 130, seen in
In one embodiment the strain relationships are achieve by having the primary portion 10000 formed of a polyamide resin, while in a further embodiment the polyamide resin includes fiber reinforcement, and in yet another embodiment the polyamide resin includes at least 35% fiber reinforcement. In one such embodiment the fiber reinforcement includes long-glass fibers having a length of at least 10 millimeters pre-molding and produce a finished primary portion 10000 having fiber lengths of at least 3 millimeters, while another embodiment includes fiber reinforcement having short-glass fibers with a length of at least 0.5-2.0 millimeters pre-molding. Incorporation of the fiber reinforcement increases the tensile strength of the primary portion 10000, however it may also reduces the primary portion elongation to break therefore a careful balance must be struck to maintain sufficient elongation. Therefore, one embodiment includes 35-55% long fiber reinforcement, while in an even further embodiment has 40-50% long fiber reinforcement. One specific example is a long-glass fiber reinforced polyamide 66 compound with 40% carbon fiber reinforcement, such as the XuanWu XW5801 resin having a tensile strength of 245 megapascal and 7% elongation at break. Long fiber reinforced polyamides, and the resulting melt properties, produce a more isotropic material than that of short fiber reinforced polyamides, primarily due to the three-dimensional network formed by the long fibers developed during injection molding. Another advantage of long-fiber material is the almost linear behavior through to fracture resulting in less deformation at higher stresses. In one particular embodiment the primary portion 10000 is formed of a polycaprolactam, a polyhexamethylene adipinamide, or a copolymer of hexamethylene diamine adipic acid and caprolactam, however other embodiments may include polypropylene (PP), nylon 6 (polyamide 6), polybutylene terephthalates (PBT), thermoplastic polyurethane (TPU), PC/ABS alloy, PPS, PEEK, and semi-crystalline engineering resin systems that meet the claimed mechanical properties.
In another embodiment the primary portion 10000 is injection molded and is formed of a material having a high melt flow rate, namely a melt flow rate (275°/2.16 Kg), per ASTM D1238, of at least 10 g/10 min. A further embodiment is formed of a primary portion non-metallic material having a primary portion density of less than 1.75 grams per cubic centimeter and a primary portion tensile strength of at least 200 megapascal; while another embodiment has a primary portion density of less than 1.50 grams per cubic centimeter and a primary portion tensile strength of at least 250 megapascal.
In one embodiment the length from the primary portion proximal end 10010 to the primary portion distal end 10020 is at least 40 millimeters and includes a ferrule 52, seen in
Another embodiment ensures preferred load distribution within the sleeve 100 by controlling the distance from the primary portion shaft bore 10040 to a screw bore formed in the single piece sleeve 100. As seen in
Additionally, the hosel insert 200, seen in
An additional benefit of the disclosed designs is reduced cost. Traditionally connection assemblies have been composed largely of machined aluminum. The cost of the asymmetric machining necessary to achieve a primary portion axis 10030 that is not parallel to the secondary portion axis 11030, and therefore affords the adjustability discussed in the “Adjustable Lie/Loft Connection Assembly” section, is significant. Injection molding of the shaft sleeve 100, or at least the majority of it, and its tilted primary portion shaft bore 10040 is estimated to reduce the cost of the connection assembly significantly, even if a secondary portion 11000 of metallic material must be symmetrically machined.
As discussed above, the grounded loft 80 of a club head is the vertical angle of the centerface normal vector when the club is in the address position (i.e., when the sole is resting on the ground), or stated differently, the angle between the club face and a vertical plane when the club is in the address position. When the shaft loft of a club is adjusted, such as by employing the system disclosed in
Conventional clubs do not allow for adjustment of the hosel/shaft loft without causing a corresponding change in the face angle.
The bottom portion 2022 comprises an adjustable sole 2010 (also referred to as an adjustable “sole portion”) that can be adjusted relative to the club head body 2002 to raise and lower at least the rear end of the club head relative to the ground. As shown, the sole 2010 has a forward end portion 2012 and a rear end portion 2014. The sole 2010 can be a flat or curved plate that can be curved to conform to the overall curvature of the bottom 2022 of the club head. The forward end portion 2012 is pivotably connected to the body 2002 at a pivot axis defined by pivot pins 2020 to permit pivoting of the sole relative to the pivot axis. The rear end portion 2014 of the sole therefore can be adjusted upwardly or downwardly relative to the club head body so as to adjust the “sole angle” 2018 of the club (
The club head can have an adjustment mechanism that is configured to permit manual adjustment of the sole 2010. In the illustrated embodiment, for example, an adjustment screw 2016 extends through the rear end portion 2014 and into a threaded opening in the body (not shown). The axial position of the screw relative to the sole 2010 is fixed so that adjustment of the screw causes corresponding pivoting of the sole 2010. For example, turning the screw in a first direction lowers the sole 2010 from the position shown in solid lines to the position shown in dashed lines in
Moreover, other techniques or mechanisms can be implemented in the club head 2000 to permit raising and lowering of the sole angle of the club. For example, the club head can comprise one or more lifts that are located near the rear end of the club head, such as shown in the embodiment of
In particular embodiments, the hosel 2008 of the club head can be configured to support a removable shaft at different predetermined orientations to permit adjustment of the shaft loft and/or lie angle of the club. For example, the club head 2000 can be configured to receive the assembly described above and shown in
Varying the sole angle of the club head changes the address position of the club head, and therefore the face angle of the club head. By adjusting the position of the sole and by adjusting the shaft loft (either by conventional bending or using a removable shaft system as described herein), it is possible to achieve various combinations of square loft and face angle with one club. Moreover, it is possible to adjust the shaft loft (to adjust square loft) while maintaining the face angle of club by adjusting the sole a predetermined amount.
As an example, Table 5 below shows various combinations of square loft, grounded loft, face angle, sole angle, and hosel loft that can be achieved with a club head that has a nominal or initial square loft of 10.4 degrees and a nominal or initial face angle of 6.0 degrees and a nominal or initial grounded loft of 14 degrees at a 60-degree lie angle. The nominal condition in Table 5 has no change in sole angle or hosel loft angle (i.e., A sole angle=0.0 and A hosel loft angle=0.0). The parameters in the other rows of Table 5 are deviations to this nominal state (i.e., either the sole angle and/or the hosel loft angle has been changed relative to the nominal state). In this example, the hosel loft angle is increased by 2 degrees, decreased by 2 degrees or is unchanged, and the sole angle is varied in 2-degree increments. As can be seen in the table, these changes in hosel loft angle and sole angle allows the square loft to vary from 8.4, 10.4, and 12.4 with face angles of −4.0, −0.67, 2.67, −7.33, 6.00, and 9.33. In other examples, smaller increments and/or larger ranges for varying the sole angle and the hosel loft angle can be used to achieve different values for square loft and face angle.
Also, it is possible to decrease the hosel loft angle and maintain the nominal face angle of 6.0 degrees by increasing the sole angle as necessary to achieve a 6.0-degree face angle at the adjusted hosel loft angle. For example, decreasing the hosel loft angle by 2 degrees of the club head represented in Table 5 will increase the face angle to 9.33 degrees. Increasing the sole angle to about 2.0 degrees will readjust the face angle to 6.0 degrees.
The bottom portion 4022 further includes an adjustable sole portion 4010 that can be adjusted relative to the club head body 4002 to raise and lower the rear end of the club head relative to the ground. As best shown in
The sole portion 4010 has a first edge 4018 located toward the heel of the club head and a second edge 4020 located at about the middle of the width of the club head. In this manner, the sole portion 4010 (from edge 4018 to edge 4020) has a length that extends transversely across the club head less than half the width of the club head. As noted above, studies have shown that most golfers address the ball with a lie angle between 10 and 20 degrees less than the intended scoreline lie angle of the club head (the lie angle when the club head is in the address position). The length of the sole portion 4010 in the illustrated embodiment is selected to support the club head on the ground at the grounded address position or any lie angle between 0 and 20 degrees less than the lie angle at the grounded address position. In alternative embodiments, the sole portion 4010 can have a length that is longer or shorter than that of the illustrated embodiment to support the club head at a greater or smaller range of lie angles. For example, the sole portion 4010 can extend past the middle of the club head to support the club head at lie angles that are greater than the scoreline lie angle (the lie angle at the grounded address position).
As best shown in
In an alternative embodiment, the axial position of each of the screws 4016 relative to the sole portion 4010 is fixed so that adjustment of the screws causes the sole portion 4010 to move away from or closer to the club head. Adjusting the sole portion 4010 downwardly increases the sole angle of the club head while adjusting the sole portion upwardly decreases the sole angle of the club head.
When a golfer changes the actual lie angle of the club by tilting the club toward or away from the body so that the club head deviates from the grounded address position, there is a slight corresponding change in face angle due to the loft of the club head. The effective face angle, eFA, of the club head is a measure of the face angle with the loft component removed (i.e. the angle between the horizontal component of the face normal vector and the target line vector), and can be determined by the following equation:
where Δlie is the measured lie angle-scoreline lie angle, GL is the grounded loft angle of the club head, and MFA is the measured face angle.
As noted above, the adjustable sole portion 4010 has a lower surface 4012 that matches the curvature of the leading edge surface portion 4024 of the club head. Consequently, the effective face angle remains substantially constant as the golfer holds the club with the club head on the playing surface and the club is tilted toward and away from the golfer so as to adjust the actual lie angle of the club. In particular embodiments, the effective face angle of the club head 4000 is held constant within a tolerance of +/−0.2 degrees as the lie angle is adjusted through a range of 0 degrees to about 20 degrees less than the scoreline lie angle. In a specific implementation, for example, the scoreline lie angle of the club head is 60 degrees and the effective face angle is held constant within a tolerance of +/−0.2 degrees for lie angles between 60 degrees and 40 degrees. In another example, the scoreline lie angle of the club head is 60 degrees and the effective face angle is held constant within a tolerance of +/−0.1 degrees for lie angles between 60 degrees and 40 degrees. In several embodiments, the effective face angle is held constant within a tolerance of about +/−0.1 degrees to about +/−0.5 degrees. In certain embodiments, the effective face angle is held constant within a tolerance of about less than +/−1 degree or about less than +/−0.7 degrees.
The components of the head-shaft connection assemblies disclosed in the present specification can be formed from any of various suitable metals, metal alloys, polymers, composites, or various combinations thereof.
In addition to those noted above, some examples of metals and metal alloys that can be used to form the components of the connection assemblies include, without limitation, carbon steels (e.g., 1020 or 8620 carbon steel), stainless steels (e.g., 304 or 410 stainless steel), PH (precipitation-hardenable) alloys (e.g., 17-4, C450, or C455 alloys), titanium alloys (e.g., 3-2.5, 6-4, SP700, 15-3-3-3, 10-2-3, or other alpha/near alpha, alpha-beta, and beta/near beta titanium alloys), aluminum/aluminum alloys (e.g., 3000 series alloys, 5000 series alloys, 6000 series alloys, such as 6061-T6, and 7000 series alloys, such as 7075), magnesium alloys, copper alloys, and nickel alloys.
Some examples of composites that can be used to form the components include, without limitation, glass fiber reinforced polymers (GFRP), carbon fiber reinforced polymers (CFRP), metal matrix composites (MMC), ceramic matrix composites (CMC), and natural composites (e.g., wood composites).
Some examples of polymers that can be used to form the components include, without limitation, thermoplastic materials (e.g., polyethylene, polypropylene, polystyrene, acrylic, PVC, ABS, polycarbonate, polyurethane, polyphenylene oxide (PPO), polyphenylene sulfide (PPS), polyether block amides, nylon, and engineered thermoplastics), thermosetting materials (e.g., polyurethane, epoxy, and polyester), copolymers, and elastomers (e.g., natural or synthetic rubber, EPDM, and Teflon®).
Table 6 illustrates twenty-four possible driver head configurations between a sleeve position and movable weight positions for a driver having movable weights installed in weight ports. Each configuration shown in Table 6 has a different configuration for providing a desired shot bias. An associated loft angle, face angle, and lie angle is shown corresponding to each sleeve position shown.
The tabulated values in Table 6 are assuming a nominal club loft of 10.5°, a nominal lie angle of 60°, and a nominal face angle of 2.0° in a neutral position. In the exemplary embodiment of Table 6, the offset angle is nominally 1.0°. The eight discrete sleeve positions “L”, “N”, NU”, “R”, “N-R”, “N-L”, NU-R”, and NU-L” represent the different spline positions a golfer can position a sleeve with respect to the club head. Of course, it is understood that four, twelve, or sixteen sleeve positions are possible. In each embodiment, the sleeve positions are symmetric about four orthogonal positions. The preferred method to locate and lock these positions is with spline teeth engaged in a mating slotted piece in the hosel as described in the embodiments described herein. The “L” or left position allows the golfer to hit a draw or draw biased shot. The “NU” or neutral upright position enables a user to hit a slight draw (less draw than the “L” position). The “N” or neutral position is a sleeve position having little or no draw or fade bias. In contrast, the “R” or right position increases the probability that a user will hit a shot with a fade bias.
As shown in Table 6, the heaviest movable weight is about 16 g and two lighter weights are about 1 g. A total weight of 18 g is provided by movable weights in this exemplary embodiment. It is understood that the movable weights can be more than 18 g or less than 18 g depending on the desired CG location. The movable weights can be of a weight and configuration as described in U.S. Pat. Nos. 6,773,360, 7,166,040, 7,186,190, 7,407,447, 7,419,441, 7,628,707, or 7,744,484, which are incorporated by reference herein in their entirety. Placing the heaviest weight in the toe region will provide a draw biased shot. In contrast, placing the heaviest weight in the heel region will provide a fade biased shot and placing the heaviest weight in the rear position will provide a more neutral shot.
The exemplary embodiment shown in Table 6 provides at least five different loft angle values for eight different sleeve configurations. The loft angle value varies from about 9.5° to 11.5° for a nominal 10.5° loft (at neutral) club. In one embodiment, a maximum loft angle change is about 2°. The sleeve assembly or adjustable loft system described above can provide a total maximum loft change (Δloft) of about 0.5° to about 3° which can be described as the following expression in Eq. 4.
0.5°≦Δloft≦3° Eq. 4
The incremental loft change can be in increments of about 0.2° to about 1.5° in order to have a noticeable loft change while being small enough to fine tune the performance of the club head. As shown in Table 6, when the sleeve assembly is positioned to increase loft, the face angle is more closed with respect to how the club sits on the ground when the club is held in the address position. Similarly, when the sleeve assembly is positioned to decrease loft, the face angle sits more open.
Furthermore, five different face angle values for eight different sleeve configurations are provided in the embodiment of Table 6. The face angle varies from about 0.3° to 3.7° in the embodiment shown with a neutral face angle of 2.0°. In one embodiment, the maximum face angle change is about 3.4°. It should be noted that a 1° change in loft angle results in a 1.7° change in face angle.
The exemplary embodiment shown in Table 6 further provides five different lie angle values for eight different sleeve configurations. The lie angle varies from about 59° to 61° with a neutral lie angle of 60°. Therefore, in one embodiment, the maximum lie angle change is about 2°.
In an alternative exemplary embodiment, an equivalent 9.5° nominal loft club would have similar face angle and lie angle values described above in Table 6. However, the loft angle for an equivalent 9.5° nominal loft club would have loft values of about 1° less than the loft values shown throughout the various settings in Table 6. Similarly, an equivalent 8.5° nominal loft club would have a loft angle value of about 2° less than those shown in Table 6.
According to some embodiments of the present application, a golf club head has a loft angle between about 6 degrees and about 16 degrees or between about 13 degrees and about 30 degrees in the neutral position. In yet other embodiments, the golf club has a lie angle between about 55 degrees and about 65 degrees in the neutral position.
Table 7 illustrates another exemplary embodiment having a nominal club loft of 10.5°, a nominal lie angle of 60°, and a nominal face angle of 2.0°. In the exemplary embodiment of Table 7, the offset angle of the shaft is nominally 1.5°.
The different sleeve configurations shown in Table 7 can be combined with different movable weight configurations to achieve a desired shot bias, as already described above. In the embodiment of Table 7, the loft angle ranges from about 9.0° to 12.0° for a 10.5° neutral loft angle club resulting in a total maximum loft angle change of about 3°. The face angle in the embodiment of Table 7 ranges from about 0.5° to 4.5° for a 2.0° neutral face angle club thereby resulting in a total maximum face angle change of about 5°. The lie angle in Table 7 ranges from about 58.5° to 61.5° for a 60° neutral lie angle club resulting in a total maximum lie angle change of about 3°.
A golf club head has a head mass defined as the combined masses of the body, weight ports, and weights. The total weight mass is the combined masses of the weight or weights installed on a golf club head. The total weight port mass is the combined mass of the weight ports and any weight port supporting structures, such as ribs.
In one embodiment, the rear weight 6304 is the heaviest weight being between about 15 grams to about 20 grams. In certain embodiments, the lighter weights can be about 1 gram to about 6 grams. In one embodiment, a single heavy weight of 16 g and two lighter weights of 1 g is preferred.
In some embodiments, a golf club head is provided with three weight ports having a total weight port mass between about 1 g and about 12 g. In certain embodiments, the weight port mass without ribs is about 3 g for a combined weight port mass of about 9 g. In some embodiments, the total weight port mass with ribbing is about 5 g to about 6 g for a combined total weight port mass of about 15 g to about 18 g.
In one embodiment, the addition of the sleeve assembly 6418 and hosel recess walls 6422 increase the weight in the heel region by about 10 g to about 12 g. In other words, a club head construction without the hosel recess walls 6422 and sleeve assembly 6418 would be about 10 g to about 12 g lighter. Due to the increase in weight in the heel region, a mass pad or fixed weight that might be placed in the heel region is unnecessary. Therefore, the additional weight from the hosel recess walls 6422 and sleeve assembly 6418 provides a sufficient impact on the center of gravity location without having to insert a mass pad or fixed weight.
In one exemplary embodiment, the weight port walls are roughly 0.6 mm to 1.5 mm thick and has a mass between 2 g to about 5 g. In one embodiment, the weight port walls alone weigh about 3 g to about 4 g. A hosel insert (as described above) has a weight of between 1 g to about 4 g. In one embodiment, the hosel insert is about 2 g. The sleeve that is inserted into the hosel insert weighs about 5 g to about 8 g. In one embodiment, the sleeve is about 6 g to about 7 g. The screw that is inserted into the sleeve weighs about 1 g to 2 g. In one exemplary embodiment, the screw weighs about 1 g to about 2 g.
Therefore, in certain embodiments, the hosel recess walls, hosel insert, sleeve, and screw have a combined weight of about 10 g to 15 g, and preferably about 14 g.
In some embodiments of the golf club head with three weight ports and three weights, the sum of the body mass, weight port mass, and weights is between about 80 g and about 220 g or between about 180 g and about 215 g. In specific embodiments the total mass of the club head is between 200 g and about 210 g and in one example is about 205 g.
The above mass characteristics seek to create a compact and lightweight sleeve assembly while accommodating the additional weight effects of the sleeve assembly on the CG of the club head. Preferably, the club head has a hosel outside diameter 6428 (shown in
The golf club head of the present application has a volume equal to the volumetric displacement of the club head body. In several embodiments, a golf club head of the present application can be configured to have a head volume between about 110 cm3 and about 600 cm3. In more particular embodiments, the head volume is between about 250 cm3 and about 500 cm3, 400 cm3 and about 500 cm3, 390 cm3 and about 420 cm3, or between about 420 cm3 and 475 cm3. In one exemplary embodiment, the head volume is about 390 to about 410 cm3.
Golf club head moments of inertia are defined about axes extending through the golf club head CG. As used herein, the golf club head CG location can be provided with reference to its position on a golf club head origin coordinate system. The golf club head origin is positioned on the face plate at approximately the geometric center, i.e. the intersection of the midpoints of a face plate's height and width.
The head origin coordinate system includes an x-axis and a y-axis. The origin x-axis extends tangential to the face plate and generally parallel to the ground when the head is ideally positioned with the positive x-axis extending from the origin towards a heel of the golf club head and the negative x-axis extending from the origin to the toe of the golf club head. The origin y-axis extends generally perpendicular to the origin x-axis and parallel to the ground when the head is ideally positioned with the positive y-axis extending from the head origin towards the rear portion of the golf club. The head origin can also include an origin z-axis extending perpendicular to the origin x-axis and the origin y-axis and having a positive z-axis that extends from the origin towards the top portion of the golf club head and negative z-axis that extends from the origin towards the bottom portion of the golf club head.
In some embodiments, the golf club head has a CG with a head origin x-axis (CGx) coordinate between about −10 mm and about 10 mm and a head origin y-axis (CGy) coordinate greater than about 15 mm or less than about 50 mm. In certain embodiments, the club head has a CG with an origin x-axis coordinate between about −5 mm and about 5 mm, an origin y-axis coordinate greater than about 0 mm and an origin z-axis (CGz) coordinate less than about 0 mm.
More particularly, in specific embodiments of a golf club head having specific configurations, the golf club head has a CG with coordinates approximated in Table 8 below. The golf club head in Table 8 has three weight ports and three weights. In configuration 1, the heaviest weight is located in the back most or rear weight port. The heaviest weight is located in a heel weight port in configuration 2, and the heaviest weight is located in a toe weight port in configuration 3.
Table 8 emphasizes the amount of CG change that can be possible by moving the movable weights. In one embodiment, the movable weight change can provide a CG change in the x-direction (heel-toe) of between about 2 mm and about 10 mm in order to achieve a large enough CG change to create significant performance change to offset or enhance the possible loft, lie, and face angel adjustments described above. A substantial change in CG is accomplished by having a large difference in the weight that is moved between different weight ports and having the weight ports spaced far enough apart to achieve the CG change. In certain embodiments, the CG is located below the center face with a CGz of less than 0. The CGx is between about −2 mm (toe-ward) and 8 mm (heel-ward) or even more preferably between about 0 mm and about 6 mm. Furthermore, the CGy can be between about 25 mm and about 40 mm (aft of the center-face).
A moment of inertia of a golf club head is measured about a CG x-axis, CG y-axis, and CG z-axis which are axes similar to the origin coordinate system except with an origin located at the center of gravity, CG.
In certain embodiments, the golf club head of the present invention can have a moment of inertia (Ixx) about the golf club head CG x-axis between about 70 kg·mm2 and about 400 kg·mm2. More specifically, certain embodiments have a moment of inertia about the CG x-axis between about 200 kg·mm2 to about 300 kg·mm2 or between about 200 kg·mm2 and about 500 kg·mm2.
In several embodiments, the golf club head of the present invention can have a moment of inertia (Izz) about the golf club head CG z-axis between about 200 kg·mm2 and about 600 kg·mm2. More specifically, certain embodiments have a moment of inertia about the CG z-axis between about 400 kg·mm2 to about 500 kg·mm2 or between about 350 kg·mm2 and about 600 kg·mm2.
In several embodiments, the golf club head of the present invention can have a moment of inertia (Iyy) about the golf club head CG y-axis between about 200 kg·mm2 and 400 kg·mm2. In certain specific embodiments, the moment of inertia about the golf club head CG y-axis is between about 250 kg·mm2 and 350 kg·mm2.
The moment of inertia can change depending on the location of the heaviest removable weight as illustrated in Table 9 below. Again, in configuration 1, the heaviest weight is located in the back most or rear weight port. The heaviest weight is located in a heel weight port in configuration 2, and the heaviest weight is located in a toe weight port in configuration 3.
According to some embodiments of a golf club head of the present application, the golf club head has a thin wall construction. Among other advantages, thin wall construction facilitates the redistribution of material from one part of a club head to another part of the club head. Because the redistributed material has a certain mass, the material may be redistributed to locations in the golf club head to enhance performance parameters related to mass distribution, such as CG location and moment of inertia magnitude. Club head material that is capable of being redistributed without affecting the structural integrity of the club head is commonly called discretionary weight. In some embodiments of the present invention, thin wall construction enables discretionary weight to be removed from one or a combination of the striking plate, crown, skirt, or sole and redistributed in the form of weight ports and corresponding weights.
Thin wall construction can include a thin sole construction, i.e., a sole with a thickness less than about 0.9 mm but greater than about 0.4 mm over at least about 50% of the sole surface area; and/or a thin skirt construction, i.e., a skirt with a thickness less than about 0.8 mm but greater than about 0.4 mm over at least about 50% of the skirt surface area; and/or a thin crown construction, i.e., a crown with a thickness less than about 0.8 mm but greater than about 0.4 mm over at least about 50% of the crown surface area. In one embodiment, the club head is made of titanium and has a thickness less than 0.65 mm over at least 50% of the crown in order to free up enough weight to achieve the desired CG location.
More specifically, in certain embodiments of a golf club having a thin sole construction and at least one weight and two weight ports, the sole, crown and skirt can have respective thicknesses over at least about 50% of their respective surfaces between about 0.4 mm and about 0.9 mm, between about 0.8 mm and about 0.9 mm, between about 0.7 mm and about 0.8 mm, between about 0.6 mm and about 0.7 mm, or less than about 0.6 mm. According to a specific embodiment of a golf club having a thin skirt construction, the thickness of the skirt over at least about 50% of the skirt surface area can be between about 0.4 mm and about 0.8 mm, between about 0.6 mm and about 0.7 mm or less than about 0.6 mm.
The thin wall construction can be described according to areal weight as defined by the equation (Eq. 5) below:
AW=p·t Eq. 5
In the above equation, AW is defined as areal weight, ρ is defined as density, and t is defined as the thickness of the material. In one exemplary embodiment, the golf club head is made of a material having a density, ρ, of about 4.5 g/cm3 or less. In one embodiment, the thickness of a crown or sole portion is between about 0.04 cm and about 0.09 cm. Therefore the areal weight of the crown or sole portion is between about 0.18 g/cm2 and about 0.41 g/cm2. In some embodiments, the areal weight of the crown or sole portion is less than 0.41 g/cm2 over at least about 50% of the crown or sole surface area. In other embodiments, the areal weight of the crown or sole is less than about 0.36 g/cm2 over at least about 50% of the entire crown or sole surface area.
In certain embodiments, the thin wall construction is implemented according to U.S. patent application Ser. No. 11/870,913 and U.S. Pat. No. 7,186,190, which are incorporated by reference herein in their entirety.
According to some embodiments, a golf club head face plate can include a variable thickness faceplate. Varying the thickness of a faceplate may increase the size of a club head COR zone, commonly called the sweet spot of the golf club head, which, when striking a golf ball with the golf club head, allows a larger area of the face plate to deliver consistently high golf ball velocity and shot forgiveness. Also, varying the thickness of a faceplate can be advantageous in reducing the weight in the face region for re-allocation to another area of the club head.
A variable thickness face plate 6500, according to one embodiment of a golf club head illustrated in
In some embodiments of a golf club head having a face plate with a protrusion, the maximum face plate thickness is greater than about 4.8 mm, and the minimum face plate thickness is less than about 2.3 mm. In certain embodiments, the maximum face plate thickness is between about 5 mm and about 5.4 mm and the minimum face plate thickness is between about 1.8 mm and about 2.2 mm. In yet more particular embodiments, the maximum face plate thickness is about 5.2 mm and the minimum face plate thickness is about 2 mm. The face thickness should have a thickness change of at least 25% over the face (thickest portion compared to thinnest) in order to save weight and achieve a higher ball speed on off-center hits.
In some embodiments of a golf club head having a face plate with a protrusion and a thin sole construction or a thin skirt construction, the maximum face plate thickness is greater than about 3.0 mm and the minimum face plate thickness is less than about 3.0 mm. In certain embodiments, the maximum face plate thickness is between about 3.0 mm and about 4.0 mm, between about 4.0 mm and about 5.0 mm, between about 5.0 mm and about 6.0 mm or greater than about 6.0 mm, and the minimum face plate thickness is between about 2.5 mm and about 3.0 mm, between about 2.0 mm and about 2.5 mm, between about 1.5 mm and about 2.0 mm or less than about 1.5 mm.
In certain embodiments, a variable thickness face profile is implemented according to U.S. patent application Ser. No. 12/006,060, U.S. Pat. Nos. 6,997,820, 6,800,038, and 6,824,475, which are incorporated herein by reference in their entirety.
In some embodiments of a golf club head having at least two weight ports, a distance between the first and second weight ports is between about 5 mm and about 200 mm. In more specific embodiments, the distance between the first and second weight ports is between about 5 mm and about 100 mm, between about 50 mm and about 100 mm, or between about 70 mm and about 90 mm. In some specific embodiments, the first weight port is positioned proximate a toe portion of the golf club head and the second weight port is positioned proximate a heel portion of the golf club head.
In some embodiments of the golf club head having first, second and third weight ports, a distance between the first and second weight port is between about 40 mm and about 100 mm, and a distance between the first and third weight port, and the second and third weight port, is between about 30 mm and about 90 mm. In certain embodiments, the distance between the first and second weight port is between about 60 mm and about 80 mm, and the distance between the first and third weight port, and the second and third weight port, is between about 50 mm and about 80 mm. In a specific example, the distance between the first and second weight port is between about 80 mm and about 90 mm, and the distance between the first and third weight port, and the second and third weight port, is between about 70 mm and about 80 mm. In some embodiments, the first weight port is positioned proximate a toe portion of the golf club head, the second weight port is positioned proximate a heel portion of the golf club head and the third weight port is positioned proximate a rear portion of the golf club head.
In some embodiments of the golf club head having first, second, third and fourth weights ports, a distance between the first and second weight port, the first and fourth weight port, and the second and third weight port is between about 40 mm and about 100 mm; a distance between the third and fourth weight port is between about 10 mm and about 80 mm; and a distance between the first and third weight port and the second and fourth weight port is about 30 mm to about 90 mm. In more specific embodiments, a distance between the first and second weight port, the first and fourth weight port, and the second and third weight port is between about 60 mm and about 80 mm; a distance between the first and third weight port and the second and fourth weight port is between about 50 mm and about 70 mm; and a distance between the third and fourth weight port is between about 30 mm and about 50 mm. In some specific embodiments, the first weight port is positioned proximate a front toe portion of the golf club head, the second weight port is positioned proximate a front heel portion of the golf club head, the third weight port is positioned proximate a rear toe portion of the golf club head and the fourth weight port is positioned proximate a rear heel portion of the golf club head.
As mentioned above, the distance between the weight ports and weight size contributes to the amount of CG change made possible in a system having the sleeve assembly described above.
In some embodiments of a golf club head of the present application having two, three or four weights, a maximum weight mass multiplied by the distance between the maximum weight and the minimum weight is between about 450 g·mm and about 2,000 g·mm or about 200 g·mm and 2,000 g·mm. More specifically, in certain embodiments, the maximum weight mass multiplied by the weight separation distance is between about 500 g·mm and about 1,500 g·mm, between about 1,200 g·mm and about 1,400 g·mm.
When a weight or weight port is used as a reference point from which a distance, i.e., a vectorial distance (defined as the length of a straight line extending from a reference or feature point to another reference or feature point) to another weight or weights port is determined, the reference point is typically the volumetric centroid of the weight port.
When a movable weight club head and the sleeve assembly are combined, it is possible to achieve the highest level of club trajectory modification while simultaneously achieving the desired look of the club at address. For example, if a player prefers to have an open club face look at address, the player can put the club in the “R” or open face position. If that player then hits a fade (since the face is open) shot but prefers to hit a straight shot, or slight draw, it is possible to take the same club and move the heavy weight to the heel port to promote draw bias. Therefore, it is possible for a player to have the desired look at address (in this case open face) and the desired trajectory (in this case straight or slight draw).
In yet another advantage, by combining the movable weight concept with an adjustable sleeve position (effecting loft, lie and face angle) it is possible to amplify the desired trajectory bias that a player may be trying to achieve.
For example, if a player wants to achieve the most draw possible, the player can adjust the sleeve position to be in the closed face position or “L” position and also put the heavy weight in the heel port. The weight and the sleeve position work together to achieve the greater draw bias possible. On the other hand, to achieve the greatest fade bias, the sleeve position can be set for the open face or “R” position and the heavy weight is placed in the top port.
As described above, the combination of a large CG change (measured by the heaviest weight multiplied by the distance between the ports) and a large loft change (measured by the largest possible change in loft between two sleeve positions, Δloft) results in the highest level of trajectory adjustability. Thus, a product of the distance between at least two weight ports, the maximum weight, and the maximum loft change is important in describing the benefits achieved by the embodiments described herein.
In one embodiment, the product of the distance between at least two weight ports, the maximum weight, and the maximum loft change is between about 50 mm·g·deg and about 6,000 mm·g·deg or even more preferably between about 500 mm·g·deg and about 3,000 mm·g·deg. In other words, in certain embodiments, the golf club head satisfies the following expressions in Eq. 6 and Eq. 7.
50 mm·g·degrees<Dwp·Mhw·Δloft<6,000 mm·g·degrees Eq. 6
500 mm·g·degrees<Dwp·Mhw·Δloft<3,000 mm·g·degrees Eq. 7
In the above expressions, Dwp, is the distance between two weight port centroids (mm), Mhw, is the mass of the heaviest weight (g), and Δloft is the maximum loft change (degrees) between at least two sleeve positions. A golf club head within the ranges described above will ensure the highest level of trajectory adjustability.
With respect to
The use of a single tool or torque wrench 6600 for adjusting the movable weights, adjustable sleeve or adjustable loft system, and adjustable sole features provides a unique advantage in that a user is not required to carry multiple tools or attachments to make the desired adjustments.
The shank 6606 terminates in an engagement end i.e. tip 6610 configured to operatively mate with the movable weights, adjustable sleeve, and adjustable sole features described herein. In one embodiment, the engagement end or tip 6610 is a bit-type drive tip having one single mating configuration for adjusting the movable weights, adjustable sleeve, and adjustable sole features. The engagement end can be comprised of lobes and flutes spaced equidistantly about the circumference of the tip.
In certain embodiments, the single tool 6600 is provided to adjust the sole angle and the adjustable sleeve (i.e. affecting loft angle, lie angle, or face angle) only. In another embodiment, the single tool 6600 is provided to adjust the adjustable sleeve and movable weights only. In yet other embodiments, the single tool 6600 is provided to adjust the movable weights and sole angle only.
In other embodiments, the metallic cap 6724 does not have a rim portion 6732 but includes an outer peripheral edge that is substantially flush and planar with the side wall 6734 of the composite insert 6722. A plurality of score lines 6712 can be located on the metallic cap 6724. The composite face insert 6710 has a variable thickness and is adhesively or mechanically attached to the insert ear 6726 located within the front opening and connected to the front opening inner wall 6714. The insert ear 6726 and the composite face insert 6710 can be of the type described in U.S. patent application Ser. Nos. 11/642,310, 11/825,138, 11/960,609, 11/960,610 and U.S. Pat. Nos. 7,267,620, RE42,544, 7,874,936, 7,874,937, and 7,985,146, which are incorporated by reference herein in their entirety.
The club head of the embodiments described in
A golf club having an adjustable loft and lie angle with a composite face insert can achieve the moment of inertia and CG locations listed in Table 10 and 11. In certain embodiments, the golf club head can include movable weights in addition to the adjustable sleeve system and composite face. In embodiments where movable weights are implemented, similar moment of inertia and CG values already described herein can be achieved.
The golf club head embodiments described herein provide a solution to the additional weight added by a movable weight system and an adjustable loft, lie, and face angle system. Any undesirable weight added to the golf club head makes it difficult to achieve a desired head size, moment of inertia, and nominal center of gravity location.
In certain embodiments, the combination of ultra-thin wall casting technology, high strength variable face thickness, strategically placed compact and lightweight movable weight ports, and a lightweight adjustable loft, lie, and face angle system make it possible to achieve high performing moment of inertia, center of gravity, and head size values.
Furthermore, an advantage of the discrete positions of the sleeve embodiments described herein allow for an increased amount of durability and more user friendly system.
As discussed above, conventional golf clubs do not allow for adjustment of the hosel/shaft loft 72 without causing a corresponding change in the face angle 30.
The club head 4000 includes an adjustable sole portion 4010 that can be adjusted relative to the club head body 4002 to raise and lower the rear end of the club head relative to the ground. One or more screws 4016 can extend through respective washers 4028, corresponding openings in the adjustable sole portion 4010, one or more shims 4026 and into threaded openings in the bottom portion 4022 of the club head body. The sole angle of the club head can be adjusted by increasing or decreasing the number of shims 4026, which changes the distance the sole portion 4010 extends from the bottom of the club head.
The sole 8022 further includes an adjustable sole portion 8010 (also referred to as a sole piece) that can be adjusted relative to the club head body 8002 to a plurality of rotational positions to raise and lower the rear end 8006 of the club head relative to the ground. This can rotate the club head about the leading edge surface portion 8024 of the sole 8022, changing the sole angle 2018. As best shown in
As best shown in
A circular, or cylindrical, wall 8040 can surround the screw hole 8030 on the upper/inner side of the adjustable sole portion 8010. The wall 8040 can also be triangular, square, pentagonal, etc., in other embodiments. The wall 8040 can be comprised of several sections 8041 having varying heights. Each section 8041 of the wall 8040 can have about the same width and thickness, and each section 8041 can have the same height as the section diametrically across from it. In this manner, the circular wall 8040 can be symmetrical about the centerline axis of the screw hole 8030. Furthermore, each pair of wall sections 8041 can have a different height than each of the other pairs of wall sections. Each pair of wall sections 8041 is sized and shaped to mate with corresponding sections on the club head to set the sole portion 8010 at a predetermined height, as further discussed below.
For example, in the triangular embodiment of the adjustable sole portion 8010 shown in
The adjustable sole portion 8010 can also include any number ribs 8044, as shown in
The triangular embodiment of the adjustable sole portion 8010 shown in
As shown in
As shown in
In other embodiments, the shape of the raised platform 8054 can be rectangular, wherein the center post and the projections collectively form a rectangular block. The projections 8058 can also have parallel sides rather than sides that flare out from the center post. The center post 8056 can include a threaded screw hole 8060 to receive a screw 8016 (see
The projections 8058 can have a different height than the center post 8056, that is to say that the projections can extend downwardly from the cavity roof 8052 either farther than or not as far as the center post. In the embodiment shown in
A releasable locking mechanism or retaining mechanism desirably is provided to lock or retain the sole portion 8010 in place on the club head at a selected rotational orientation of the sole portion. For example, at least one fastener can extend through the bottom wall 8012 of the adjustable sole portion 8010 and can attach to the recessed cavity 8014 to secure the adjustable sole portion to the body 8002. In the embodiment shown in
In the embodiment shown in
As best shown in
In the illustrated embodiment, both the leading edge surface 8024 and the bottom surface 8012 of the adjustable sole portion 8010 are convex surfaces. In other embodiments, surfaces 8012 and 8024 are not necessarily curved surfaces but they desirably still have the same profile extending in the heel-to-toe direction. In this manner, if the club head 8000 deviates from the grounded address position (e.g., the club is held at a lower or flatter lie angle), the effective face angle of the club head does not change substantially, as further described below. The crown-to-face transition or top-line would stay relatively stable when viewed from the address position as the club is adjusted between the lie ranges described herein. Therefore, the golfer is better able to align the club with the desired direction of the target line.
In the embodiment shown in
The CGy coordinate is located between the leading edge surface portion 8024 that contacts the ground surface and the point where the bottom wall 8012 of the adjustable sole portion 8010 contacts the ground surface (as measured along the head origin-y-axis).
The sole angle 2018 of the club head 8000 can be adjusted by changing the distance the adjustable sole portion 8010 extends from the bottom of the body 8002. Adjusting the adjustable sole portion 8010 downwardly increases the sole angle 2018 of the club head 8000 while adjusting the sole portion upwardly decreases the sole angle of the club head. This can be done by loosening or removing the screw 8016 and rotating the adjustable sole portion 8010 such that a different pair of wall sections 8041 aligns with the projections 8058, then re-tightening the screw. In a triangular embodiment, the adjustable sole portion 8010 can be rotated to three different discrete positions, with each position aligning a different height pair of wall sections 8041 with the projections 8058. In this manner, the sole portion 8010 can be adjusted to extend three different distances from the bottom of the body 8002, thus creating three different sole angle options.
In particular, the sole portion 8010 extends the shortest distance from the sole 8022 when the projections 8058 are aligned with wall sections 8041a, 8041b; the sole portion 8010 extends an intermediate distance when the projections are aligned with wall sections 8041c, 8041d; and the sole portion extends the farthest distance when the projections 8058 are aligned with wall sections 8041e, 8041f. Similarly, in an embodiment of the adjustable sole portion 8010 having a square shape, it is possible to have four different sole angle options.
In alternative embodiments, the adjustable sole portion 8010 can include more than or fewer than three pairs of wall sections 8041 that enable the adjustable sole portion to be adjusted to extend more than or fewer than three different discrete distances from the bottom of body 8002.
The sole portion 8010 can be adjusted to extend different distances from the bottom of the body 8002, as discussed above, which in turn causes a change in the face angle 30 of the club. In particular, adjusting the sole portion 8010 such that it extends the shortest distance from the bottom of the body 8002 (i.e. the projections 8058 are aligned with sections 8041a and 8041b) can result in an increased face angle 30 or open the face and adjusting the sole portion such that it extends the farthest distance from the bottom of the body (i.e. the projections are aligned with sections 8041e and 8041f) can result in a decreased face angle or close the face. In particular embodiments, adjusting the sole portion 8010 can change the face angle 30 of the golf club head 8000 about 0.5 to about 12 degrees. Also, as discussed above with respect to the embodiments shown in
It can be appreciated that the non-circular shape of the sole portion 8010 and the recessed cavity 8014 serves to help prevent rotation of the sole portion relative to the recessed cavity and defines the predetermined positions for the sole portion. However, the adjustable sole portion 8010 could have a circular shape (not shown). To prevent a circular outer rim 8034 from rotating within a cavity, one or more notches can be provided on the outer rim 8034 that interact with one or more tabs extending inward from the cavity side wall 8050, or vice versa. In such circular embodiments, the sole portion 8010 can include any number of pairs of wall sections 8041 having different heights. Sufficient notches on the outer rim 8034 can be provided to correspond to each of the different rotational positions that the wall sections 8041 allow for.
In other embodiments having a circular sole portion 8010, the sole portion can be rotated within a cavity in the club head to an infinite number of positions. In one such embodiment, the outer rim of the sole portion and the cavity side wall 8050 can be without notches and the circular wall 8040 can comprise one or more gradually inclining ramp-like wall sections (not shown). The ramp-like wall sections can allow the sole portion 8010 to gradually extend farther from the bottom of the body 8002 as the sole portion is gradually rotated in the direction of the incline such that projections 8058 contact gradually higher portions of the ramp-like wall sections. For example, two ramp-like wall sections, each extending about 180-degrees around the circular wall 8040, can be included, such that the shortest portion of each ramp-like wall section is adjacent to the tallest portion of the other wall section. In such an embodiment having an “analog” adjustability, the club head can rely on friction from the screw 8016 or other central fastener to prevent the sole portion 8010 from rotating within the recessed cavity 8014 once the position of the sole portion is set.
The adjustable sole portion 8010 can also be removed and replaced with an adjustable sole portion having shorter or taller wall sections 8041 to further add to the adjustability of the sole angle 2018 of the club 8000. For example, one triangular sole portion 8010 can include three different but relatively shorter pairs of wall sections 8014, while a second sole portion can include three different but relatively longer pairs of wall sections. In this manner, six different sole angles 2018 can be achieved using the two interchangeable triangular sole portions 8010. In particular embodiments, a set of a plurality of sole portions 8010 can be provided. Each sole portion 8010 is adapted to be used with a club head and has differently configured wall sections 8041 to achieve any number of different sole angles 2018 and/or face angles 30.
In particular embodiments, the combined mass of the screw 8016 and the adjustable sole portion 8010 is between about 2 and about 11 grams, and desirably between about 4.1 and about 4.9 grams. Furthermore, the recessed cavity 8014 and the projection 8054 can add about 1 to about 10 grams of additional mass to the sole 8022 compared to if the sole had a smooth, 0.6 mm thick, titanium wall in the place of the recessed cavity 8014. In total, the golf club head 8000 (including the sole portion 8010) can comprise about 3 to about 21 grams of additional mass compared to if the golf club head had a conventional sole having a smooth, 0.6 mm thick, titanium wall in the place of the recessed cavity 8014, the adjustable sole portion 8010, and the screw 8016.
In other particular embodiments, at least 50% of the crown 8021 of the club head body 8002 can have a thickness of less than about 0.7 mm.
In still other particular embodiments, the golf club body 8002 can define an interior cavity (not shown) and the golf club head 8000 can have a center of gravity with a head origin x-axis coordinate greater than about 2 mm and less than about 8 mm and a head origin y-axis coordinate greater than about 25 mm and less than about 40 mm, where a positive y-axis extends toward the interior cavity. In at least these embodiments, the golf club head 8000 center of gravity can have a head origin z-axis coordinate less than about 0 mm.
In other particular embodiments, the golf club head 8000 can have an moment of inertia about a head center of gravity x-axis generally parallel to an origin x-axis that can be between about 200 and about 500 kg·mm2 and a moment of inertia about a head center of gravity z-axis generally perpendicular to ground, when the golf club head is ideally positioned, that can be between about 350 and about 600 kg·mm2.
In certain embodiments, the golf club head 8000 can have a volume greater than about 400 cc and a mass less than about 220 grams.
Table 12 below lists various properties of one particular embodiment of the golf club head 8000.
The addition of a recessed sole port and an attached adjustable sole piece can undesirably change the sound the club makes during impact with a ball. For example, compared to a similar club without an adjustable sole piece, the addition of the sole piece can cause lower sound frequencies, such as first mode sound frequencies below 3,000 Hz and/or below 2,000 Hz, and a longer sound duration, such as 0.09 seconds or longer. The lower and long sound frequencies can be distracting to golfers. The ribs on the internal surface of the sole can be oriented in several different directions and can tie the sole port to other strong structures of the club head body, such as weight ports at the sole and heel of the body and/or the skirt region between the sole and the crown. One or more ribs can also be tied to the hosel to further stabilize the sole. With the addition of such ribs on the internal surface of the sole, the club head can produce higher sound frequencies when striking a golf ball on the face, such as above 2,500 Hz, above 3,000 Hz, and/or above 3,500 Hz, and with a shorter sound duration, such as less than 0.05 seconds, which can be more desirable for a golfer. In addition, with the described ribs, the sole can have a frequency, such as a natural frequency, of a first fundamental sole mode that is greater than 2,500 Hz and/or greater than 3,000 Hz, wherein the sole mode is a vibration frequency associated with a location on the sole. Typically, this location is the location on the sole that exhibits a largest degree of deflection resulting from striking a golf ball.
As shown in
The illustrated club head 9000 also comprises an adjustable toe weight 9028 at a toe weight port 9026, an adjustable heel weight 9032 at a heel weight port 9030, and an adjustable sole piece 9036 at a sole port, or pocket, 9034, as described in detail above.
As shown in
The transition zone 9044 can extend around the recessed sole region 9042 and can define the boundary between the primary sole region 9040 and the recessed sole region 9042. The transition zone 9044 can comprise a sloped, annular wall that creates a sharp elevation change between the lower primary sole region and the raised recessed sole region. The thickness of the sole 9016 can also change across the transition zone 9044.
The recessed sole region 9042 is the portion of the sole inside the transition zone 9044 and outside of the sole port 9034. The recessed sole region can have a thickness of about 0.55 mm to about 0.85 mm and can be recessed from about 2 mm to about 6 mm above the surrounding primary sole region 9040.
The sole port 9034 is positioned within the recessed sole region 9042 and forms a cavity that is recessed to a greater extent than the surrounding recessed sole region 9042. The sole port 9034 can include an annular side wall 9046 and an upper wall 9048. The side wall 9046 and the upper wall 9048 can have a thickness of about 0.55 mm to about 0.85 mm, such as about 0.7 mm. As shown in
As shown in
With the aperture 9052 is located in a rear-heel quadrant, at least two ribs can converge at a convergence location near the aperture 9052. In some embodiments, at least three ribs or at least four ribs converge at a convergence location located in the rear-heel quadrant of the club head. It is understood that the number of ribs that converge in the rear-heel quadrant can be between two and ten ribs in total.
One or more ribs are disposed on the internal surface of the sole 9016. The ribs can be part of the same material that forms the sole 9016 and/or the rest of the body, such a metal or metal alloy, as describe above in detail. The ribs can be formed as an integral part of the sole, such as by casting, such that the ribs and the sole are of the same monolithic structure. The bottom of the ribs can be integrally connected to sole without the need for welding or other attachment methods. In other embodiments, one or more of the ribs can be formed at least partially separate from the sole and then attached to the sole, such as by welding.
As shown in
The first rib 9060 can extend between the toe weight port 9026 and the cylindrical wall 9058, the second rib 9062 can extend between the heel weight port 9030 and the cylindrical wall, and the third rib 9064 can extend between the rear portion 9006 and the cylindrical wall. The ribs can also include a fourth rib 9066 that extends from the cylindrical wall 9058 in a frontward direction. The fourth rib 9066 can terminate at a forward end along the recessed sole region 9042. All four of these ribs can extend from the cylindrical wall 9058, across upper wall 9048 and the side wall 9046 of the sole port 9034, and along the recessed sole region 9042. The first, second and third ribs, 9060, 9062, 9064, respectively, can extend further across the recessed sole region 9042, across the transition zone 9044, and across the primary sole region 9040. Positioning ribs along the upper, internal surfaces of the sole port 9034 can stabilize the sole port region of the body and endow the sole with vibration and sound characteristic that are similar to that of a smooth sole that does not include an adjustable sole. Connecting multiple ribs together above the sole port, such as with the cylindrical wall, can further enhance the stabilization of the sole port region.
The first rib 9060 can extend across the both the rear-heel quadrant and the rear-toe quadrant of the club head, as shown in
As shown in
The ribs can further comprise the fifth rib 9068 and/or a sixth rib 9070, as shown in
The sixth rib 9070 can be shorter that the fifth rib 9068 and can extend from the hosel base portion 9013, across the hosel perimeter region 9054, across the sole transition zone 9044, and can terminate along the recessed sole region 9070 at a location rearward of the fifth rib 9068. The first, second, third, fourth, fifth and sixth ribs, 9060, 9062, 9064, 9066, 9068, 9070, respectively, are hereinafter collectively referred to as “the ribs” unless otherwise specified.
As shown in
The fifth rib 9068 can have a variable height that is larger (such as about 3 mm to about 12 mm) adjacent the hosel 9012 and adjacent the toe weight port 9026 and smaller (such as about 2 mm to about 5 mm) where the fifth rib crosses the recess sole region 9042. The fifth rib 9068 can decrease in height as it crosses over the sole transition zone 9044 at a first location nearer to the hosel from the hosel perimeter region 9054 to the recessed sole region 9042, and the fifth rib 9068 can increase in height as the it crosses the sole transition zone 9044 at a second location nearer to the toe from the recessed sole region 9042 to the primary sole region 9040. The sixth rib 9070 can similarly have a greater height above the hosel perimeter region 9054 and a relatively smaller height above the recessed sole region 9042. The increased height of the ribs adjacent their more rigid connection locations at the respective perimeter portions of the club head can provide the ribs with greater rigidity and/or moment resistance at those perimeter locations. In addition, the connection of ribs to relatively more rigid structures of the body 9002, such as the hosel 9012, the toe weight port 9026, the heel weight port 9030 and the cylindrical wall 9058 can also provide a more rigidity and/or moment resistance to the ribs. The increased rigidity and/or moment resistance of the ribs can provide a more optimal influence on the vibration and sound characteristics of the club head 9000 when striking a golf ball. In some embodiments, the ribs are configured to cause the club head 9000 to emit a sound frequency, when striking a golf ball, that corresponds to a sound frequency that would be emitted by the club head if the sole port 9034, the ribs, the sole piece 9036 and the sole piece fastener 9078 were removed and replaced with a smooth sole portion.
One or more of the ribs can have a width dimension that is constant or nearly constant along the entire length of the rib. In some embodiments, such as the illustrated embodiment, each of the ribs has the same, constant width, such as about 0.8 mm, or greater than 0.5 mm and less than about 1.5 mm. In one embodiment, the rib has a width of about 0.7 mm. In other embodiments, different ribs can have different widths. In some embodiments, the width of one or more of the ribs can vary along the length of the rib, such as being wider nearer to the rib end portions and narrower at an intermediate portion. In general, the width of the ribs is less than the height of the ribs.
One or more of the ribs can form a straight line when projected onto a plane parallel with the ground, when the club head 9000 is in the address position. In other words, one or more of the ribs can extend along a two-dimensional path between its end points. For example, from the top-down perspective shown in
It should be noted that the internal sole ribs described herein are not raised portions of the sole that correspond to recessed grooves in the external surface of sole. Instead, the ribs described herein comprise additional structural material that is positioned above the internal surface of sole. In other words, if the ribs were removed, a smooth internal sole surface would remain.
The external surface of the sole port 9034 can be configured to fittingly receive the adjustable sole portion 9036, as described above in detail with respect to
In accordance with the pentagonal sole piece 9080, the sole port 9034 can have a matching pentagonal shape to receive the sole piece 9080.
Referring to
In one embodiment, when surfaces C of the stepped wall 9088 are in contact with the platform 9072, the face angle is at a neutral face angle, or 0°. In this embodiment, surfaces A correspond with a 4° open face angle, surfaces B correspond with a 2° open face angle, surfaces D correspond with a −2° closed face angle, and surfaces E correspond with a −4° closed face angle. The heights of the surfaces A-E can vary to produce other face angle adjustments. Having five face angle settings can be a desirable feature for golfers. In addition, the five face angle settings can cover a broader range of face angles without unduly large angle gaps between each setting.
As shown in
Regardless of the configuration of the adjustable sole piece (whether it is circular, elliptical, polygonal, triangular, quadrilateral, pentagonal, hexagonal, heptagonal, octagonal, enneagonal, decagonal, or some other shape), the curvature of the bottom surface of the sole piece can be selected to match the curvature of the front contact surface 9041 at the front of the sole 9016 (see
In accordance with the pentagonal sole piece 9100, the sole port 9034 can have a matching pentagonal shape as shown in
Because of the pentagonal shape of the outer rim 9104 of the sole piece 9100 and the matching pentagonal shape of the sole port 9034 of
According to some embodiments of the golf club heads described herein, the golf club head includes a slidably repositionable weight. Among other advantages, a slidably repositionable weight facilitates the ability of the end user of the golf club to adjust the location of the CG of the club head over a range of locations relating to the position of the repositionable weight.
The exemplary golf club heads described herein and shown in
In the embodiments shown in
Turning next to
In some embodiments, a plurality of locking projections 9334 are formed on a surface of one or more of the front and rear ledges 9330, 9332. In the embodiments shown, the locking projections 9334 are located on an outward-facing surface of the rear ledge 9332. As described more fully below, each of the locking projections 9334 has a size and shape adapted to engage one of a plurality of locking notches formed on the weight assembly 9340 to thereby retain the weight assembly 9340 in a desired location within the channel 9320. In the embodiment shown, each locking projection 9334 has a generally hemispherical shape.
In alternative embodiments, the locking projections 9334 may be located on one or more other surfaces defined by the front ledge 9330 and/or rear ledge 9332. For example, in some embodiments, locking projections are located on an outward facing surface of the front ledge 9330, while in other embodiments the locking projections are located on an inward-facing surface of one or both of the front ledge 9330 and rear ledge 9332. In further embodiments, the weight assembly 9340 is retained on the front and rear ledges 9330, 9332 without the use of locking projections. In still further embodiments, a plurality of locking notches (not shown in the Figures) are located on one or more surfaces of the front and rear ledges 9330, 9332 and are adapted to engage locking projections that are located on engaging portions of the weight assembly 9340. All such combinations, as well as others, may be suitable for retaining the weight assembly 9340 at selected locations within the channel 9320.
In the embodiments shown in the Figures, the channel 9320 is substantially straight within the X-Y plane (see, e.g.,
In the embodiments shown, the distance between a first vertical plane passing through the center of the face plate 9318 and a second vertical plane that bisects the channel 9320 at the same x-coordinate as the center of the face plate 9318 is between about 15 mm and about 50 mm, such as between about 20 mm and about 40 mm, such as between about 25 mm and about 30 mm. In the embodiments shown, the width of the channel (i.e., the horizontal distance between the front channel wall 9326 and rear channel wall 9327 adjacent to the locations of front ledge 9330 and rear ledge 9332) may be between about 8 mm and about 20 mm, such as between about 10 mm and about 18 mm, such as between about 12 mm and about 16 mm. In the embodiments shown, the depth of the channel (i.e., the vertical distance between the bottom channel wall 9328 and an imaginary plane containing the regions of the sole 9316 adjacent the front and rear edges of the channel 9320) may be between about 6 mm and about 20 mm, such as between about 8 mm and about 18 mm, such as between about 10 mm and about 16 mm. In the embodiments shown, the length of the channel (i.e., the horizontal distance between the heel end 9322 of the channel and the toe end 9324 of the channel) may be between about 30 mm and about 120 mm, such as between about 50 mm and about 100 mm, such as between about 60 mm and about 90 mm.
Turning next to
Also shown in
The weight assembly 9340 and the manner in which the weight assembly 9340 is retained on the front and rear ledges 9330, 9332 within the channel 9320 are shown in more detail in
In the embodiment shown in
The washer 9342 also includes a raised center ridge 9352 on the inward-facing surface 9350. The raised center ridge 9352 has a width dimension that is slightly smaller than the separation distance between the front ledge 9330 and rear ledge 9332, such that the center ridge 9352 is able to slide in the heel-to-toe direction within the channel 9320 while being laterally restrained by the front and rear ledges 9330, 9332.
An embodiment of the mass member 9344 is shown in
As shown in
In some embodiments, the mass of the weight assembly is between about 5 g and about 25 g, such as between about 7 g and about 20 g, such as between about 9 g and about 15 g. In some alternative embodiments, the mass of the weight assembly may be between about 5 g and about 45 g, such as between about 9 g and about 35 g, such as between about 9 g and about 30 g, such as between about 9 g and about 25 g. Each of the washer 9342 and the mass member 9344 may be formed of materials such as aluminum, titanium, stainless steel, tungsten, metal alloys containing these materials, or combinations of these materials. The fastening bolt 9346 is preferably formed of titanium alloy or stainless steel. In the embodiments shown, each of the washer 9342 and mass element 9344 has a length and width that ranges from about 8 mm to about 20 mm, such as from about 10 mm to about 18 mm, such as from about 12 mm to about 16 mm. The height of the washer 9342 and mass element 9344 embodiments shown in the Figures is from about 2 mm to about 8 mm, such as from about 3 mm to about 7 mm, such as from about 4 mm to about 6 mm.
The addition of the channel 9320 and an attached adjustable weight assembly 9340 can undesirably change the sound the club makes during impact with a ball. Accordingly, one or more ribs 9380 are provided on the internal surface of the sole (i.e., within the internal cavity of the club head 9300). The ribs 9380 on the internal surface of the sole can be oriented in several different directions and can tie the channel 9320 to other strong structures of the club head body, such as the sole of the body and/or the skirt region between the sole and the crown. One or more ribs can also be tied to the hosel to further stabilize the sole. With the addition of such ribs on the internal surface of the sole, the club head can produce higher sound frequencies when striking a golf ball on the face, as discussed above in relation to the ribs associated with the adjustable sole plate port.
In some embodiments, the weight assembly 9340 is installed into the channel 9320 by placing the weight assembly 9340 into an installation cavity 9336 located adjacent to the toe end 9324 of the channel. The installation cavity 9336 is a portion of the channel 9320 in which the front ledge 9330 and rear ledge 9332 do not extend, thereby facilitating placement of the assembled weight assembly 9340 into the channel 9320. Once placed into the installation cavity 9336, the weight assembly 9340 is shifted toward the heel end 9322 and into engagement with the front ledge 9330 and rear ledge 9332. After the weight assembly 9340 is shifted completely out of the installation cavity 9336, an optional cap or plug (see, e.g.,
As noted above, in the embodiment shown in
The embodiment shown in
Further details concerning the insert support structure are described in U.S. Pat. No. RE43,801. The illustrated club head also includes an adjustable shaft attachment system for coupling a shaft to the hosel 9312, the system including various components, such as a sleeve 9920, a washer 9922, a hosel insert 9924, and a screw 9926. The shaft connection system 9020, in conjunction with the hosel 9012, can be used to adjust the orientation of the club head 9000 with respect to the shaft, as described in detail above.
To use the adjustable weight system shown in
In some embodiments of the golf clubs described herein, the location, position or orientation of features of the golf club head, such as the golf club head 9302, can be referenced in relation to fixed reference points, e.g., a golf club head origin, other feature locations or feature angular orientations. The location or position of a weight or weight assembly, such as the weight assembly 9340, is typically defined with respect to the location or position of the weight's or weight assembly's center of gravity. When a weight or weight assembly is used as a reference point from which a distance, i.e., a vectorial distance (defined as the length of a straight line extending from a reference or feature point to another reference or feature point) to another weight or weight assembly location is determined, the reference point is typically the center of gravity of the weight or weight assembly.
The location of the weight assembly on a golf club head can be approximated by its coordinates on the head origin coordinate system. The head origin coordinate system includes an origin at the ideal impact location 312 of the golf club head, which is disposed at the geometric center of the striking surface 310 (see
As described above, in some of the embodiments of the golf club head 9302 described herein, the channel 9320 extends generally from a heel end 9322 oriented toward the heel portion 9310 to a toe end 9324 oriented toward the toe portion 9308, with both the heel end 9322 and toe end 9324 being at or near the same distance from the front portion of the club head. As a result, in these embodiments, the weight assembly 9340 that is slidably retained within the channel 9320 is capable of a relatively large amount of adjustment in the direction of the x-axis, while having a relatively small amount of adjustment in the direction of the y-axis. In some alternative embodiments, the heel end 9322 and toe end 9324 may be located at varying distances from the front portion, such as having the heel end 9322 further rearward than the toe end 9324, or having the toe end 9322 further rearward than the heel end 9322. In these alternative embodiments, the weight assembly 9340 that is slidably retained within the channel 9320 is capable of a relatively large amount of adjustment in the direction of the x-axis, while also having from a small amount to a larger amount of adjustment in the direction of the y-axis.
For example, in some embodiments of a golf club head 9302 having a weight assembly 9340 that is adjustably positioned within a channel 9320, the weight assembly 9340 can have an origin x-axis coordinate between about −50 mm and about 65 mm, depending upon the location of the weight assembly within the channel 9320. In specific embodiments, the weight assembly 9340 can have an origin x-axis coordinate between about −45 mm and about 60 mm, or between about −40 mm and about 55 mm, or between about −35 mm and about 50 mm, or between about −30 mm and about 45 mm, or between about −25 mm and about 40 mm, or between about −20 mm and about 35 mm. Thus, in some embodiments, the weight assembly 9340 is provided with a maximum x-axis adjustment range (Max Δx) that is greater than 50 mm, such as greater than 60 mm, such as greater than 70 mm, such as greater than 80 mm, such as greater than 90 mm, such as greater than 100 mm, such as greater than 110 mm.
On the other hand, in some embodiments of the golf club head 9302 having a weight assembly 9340 that is adjustably positioned within a channel 9320, the weight assembly 9340 can have an origin y-axis coordinate between about 20 mm and about 60 mm. More specifically, in certain embodiments, the weight assembly 9340 can have an origin y-axis coordinate between about 20 mm and about 50 mm, between about 20 mm and about 45 mm, or between about 25 mm and about 45 mm, or between about 20 mm and about 40 mm, or between about 25 mm and about 40 mm, or between about 25 mm and about 35 mm. Thus, in some embodiments, the weight assembly 9340 is provided with a maximum y-axis adjustment range (Max Δy) that is less than 40 mm, such as less than 30 mm, such as less than 20 mm, such as less than 10 mm, such as less than 5 mm, such as less than 3 mm.
In some embodiments, a golf club head can be configured to have a constraint relating to the relative distances that the weight assembly can be adjusted in the origin x-direction and origin y-direction. Such a constraint can be defined as the maximum y-axis adjustment range (Max Δy) divided by the maximum x-axis adjustment range (Max Δx). According to some embodiments, the value of the ratio of (Max Δy)/(Max Δx) is between 0 and about 0.8. In specific embodiments, the value of the ratio of (Max Δy)/(Max Δx) is between 0 and about 0.5, or between 0 and about 0.2, or between 0 and about 0.15, or between 0 and about 0.10, or between 0 and about 0.08, or between 0 and about 0.05, or between 0 and about 0.03, or between 0 and about 0.01.
As discussed above, in some embodiments, the mass of the weight assembly 9340 is between about 5 g and about 25 g, such as between about 7 g and about 20 g, such as between about 9 g and about 15 g. In some alternative embodiments, the mass of the weight assembly 9340 is between about 5 g and about 45 g, such as between about 9 g and about 35 g, such as between about 9 g and about 30 g, such as between about 9 g and about 25 g.
In some embodiments, a golf club head can be configured to have constraints relating to the product of the mass of the weight assembly and the relative distances that the weight assembly can be adjusted in the origin x-direction and/or origin y-direction.
One such constraint can be defined as the mass of the weight assembly (MWA) multiplied by the maximum x-axis adjustment range (Max Δx). According to some embodiments, the value of the product of MWA×(Max Δx) is between about 250 g·mm and about 4950 g·mm. In specific embodiments, the value of the product of MWA.×(Max Δx) is between about 500 g·mm m and about 4950 g·mm, or between about 1000 g·mm and about 4950 g·mm, or between about 1500 g·mm and about 4950 g·mm, or between about 2000 g·mm and about 4950 g·mm, or between about 2500 g·mm and about 4950 g·mm, or between about 3000 g·mm and about 4950 g·mm, or between about 3500 g·mm and about 4950 g·mm, or between about 4000 g·mm and about 4950 g·mm.
Another constraint relating to the product of the mass of the weight assembly and the relative distances that the weight assembly can be adjusted in the origin x-direction and/or origin y-direction can be defined as the mass of the weight assembly (MWA) multiplied by the maximum y-axis adjustment range (Max Δy). According to some embodiments, the value of the product of MWA×(Max Δy) is between about 0 g·mm and about 1800 g·mm. In specific embodiments, the value of the product of MWA×(Max Δy) is between about 0 g·mm and about 1500 g·mm, or between about 0 g·mm and about 1000 g·mm, or between about 0 g·mm and about 500 g·mm, or between about 0 g·mm and about 250 g·mm, or between about 0 g·mm and about 150 g·mm, or between about 0 g·mm and about 100 g·mm, or between about 0 g·mm m and about 50 g·mm, or between about 0 g·mm and about 25 g·mm.
As noted above, one advantage obtained with a golf club head having a slidably repositionable weight assembly, such as the golf club head 9302 having the weight assembly 9340, is in providing the end user of the golf club with the capability to adjust the location of the CG of the club head over a range of locations relating to the position of the repositionable weight. In particular, the present inventors have found that there is a distance advantage to providing a center of gravity of the club head that is lower and more forward relative to comparable golf clubs that do not include a weight assembly such as the weight assembly 9340 described herein.
In some embodiments, the golf club head 9302 has a CG with a head origin x-axis coordinate (CGx) between about −10 mm and about 10 mm, such as between about −4 mm and about 9 mm, such as between about −3 mm and about 8 mm, such as between about −2 mm to about 5 mm. In some embodiments, the golf club head 9302 has a CG with a head origin y-axis coordinate (CGy) greater than about 15 mm and less than about 50 mm, such as between about 22 mm and about 43 mm, such as between about 24 mm and about 40 mm, such as between about 26 mm and about 35 mm. In some embodiments, the golf club head 9302 has a CG with a head origin z-axis coordinate (CGz) greater than about −8 mm and less than about 3 mm, such as between about −6 mm and about 0 mm. In some embodiments, the golf club head 9302 has a CG with a head origin z-axis coordinate (CGz) that is less than 0 mm, such as less than −2 mm, such as less than −4 mm, such as less than −5 mm, such as less than −6 mm.
As described herein, by repositioning the slidable weight assembly 9340 within the channel 9320 of the golf club head 9302, the location of the CG of the club head is adjusted. For example, in some embodiments of a golf club head 9302 having a weight assembly 9340 that is adjustably positioned within a channel 9320, the club head is provided with a maximum CGx adjustment range (Max ΔCGx) attributable to the repositioning of the weight assembly 9340 that is greater than 1 mm, such as greater than 2 mm, such as greater than 4 mm, such as greater than 6 mm, such as greater than 8 mm, such as greater than 10 mm, such as greater than 11 mm.
Moreover, in some embodiments of the golf club head 9302 having a weight assembly 9340 that is adjustably positioned within a channel 9320, the club head is provided with a CGy adjustment range (Max ΔCGy) that is less than 6 mm, such as less than 3 mm, such as less than 1 mm, such as less than 0.5 mm, such as less than 0.25 mm, such as less than 0.1 mm.
In some embodiments, a golf club head can be configured to have a constraint relating to the relative amounts that the CG is able to be adjusted in the origin x-direction and origin y-direction. Such a constraint can be defined as the maximum CGy adjustment range (Max ΔCGy) divided by the maximum CGx adjustment range (Max ΔCGx). According to some embodiments, the value of the ratio of (Max ΔCGy)/(Max ΔCGx) is between 0 and about 0.8. In specific embodiments, the value of the ratio of (Max ΔCGy)/(Max ΔCGx) is between 0 and about 0.5, or between 0 and about 0.2, or between 0 and about 0.15, or between 0 and about 0.10, or between 0 and about 0.08, or between 0 and about 0.05, or between 0 and about 0.03, or between 0 and about 0.01.
In some embodiments, a golf club head can be configured such that only one of the above constraints apply. In other embodiments, a golf club head can be configured such that more than one of the above constraints apply. In still other embodiments, a golf club head can be configured such that all of the above constraints apply.
Table 13 below lists various properties of one particular embodiment of the golf club head 9302 having a weight assembly 9340 retained within a channel 9320.
In addition,
Whereas the invention has been described in connection with representative embodiments, it will be understood that the invention is not limited to those embodiments. On the contrary, the invention is intended to encompass all modifications, alternatives, and equivalents as may fall within the scope of the invention, as defined by the following claims.
Related applications concerning golf clubs and connection assemblies include U.S. patent application Ser. Nos. 13/686,677, 13/841,325, 13/956,046, 14/074,481, 14/109,739, 14/196,964, and 14/456,927, which are incorporated by reference herein in their entirety.
