Patent Grant
8147349
Golf is enjoyed by a wide variety of players—players of different genders and dramatically different ages and/or skill levels. Golf is somewhat unique in the sporting world in that such diverse collections of players can play together in golf events, even in direct competition with one another (e.g., using handicapped scoring, different tee boxes, in team formats, etc.), and still enjoy the golf outing or competition. These factors, together with the increased availability of golf programming on television (e.g., golf tournaments, golf news, golf history, and/or other golf programming) and the rise of well known golf superstars, at least in part, have increased golf's popularity in recent years, both in the United States and across the world.
Golfers at all skill levels seek to improve their performance, lower their golf scores, and reach that next performance “level.” Manufacturers of all types of golf equipment have responded to these demands, and in recent years, the industry has witnessed dramatic changes and improvements in golf equipment. For example, a wide range of different golf ball models now are available, with balls designed to complement specific swing speeds and/or other player characteristics or preferences, e.g., with some balls designed to fly farther and/or straighter; some designed to provide higher or flatter trajectories; some designed to provide more spin, control, and/or feel (particularly around the greens); some designed for faster or slower swing speeds; etc. A host of swing and/or teaching aids also are available on the market that promise to help lower one's golf scores.
Being the sole instrument that sets a golf ball in motion during play, golf clubs also have been the subject of much technological research and advancement in recent years. For example, the market has seen dramatic changes and improvements in putter designs, golf club head designs, shafts, and grips in recent years. Additionally, other technological advancements have been made in an effort to better match the various elements and/or characteristics of the golf club and characteristics of a golf ball to a particular user's swing features or characteristics (e.g., club fitting technology, ball launch angle measurement technology, ball spin rates, etc.).
Given the recent advances, there is a vast array of golf club component parts available to the golfer. For example, club heads are produced by a wide variety of manufacturers in a variety of different models. Moreover, the individual club head models may include multiple variations, such as variations in the loft angle, lie angle, offset features, weighting characteristics (e.g., draw biased club heads, fade biased club heads, neutrally weighted club heads, etc.). Additionally, the club heads may be combined with a variety of different shafts, e.g., from different manufacturers; having different stiffnesses, flex points, kick points, or other flexion characteristics, etc.; made from different materials; etc.). Between the available variations in shafts and club heads, there are literally hundreds of different club head/shaft combinations available to the golfer.
Club fitters and golf professionals can assist in fitting golfers with a golf club head/shaft combination that suits their swing characteristics and needs. Conventionally, however, golf club heads are permanently mounted to shafts using cements or adhesives. Therefore, to enable a golfer to test a variety of head/shaft combinations, the club fitter or professional must carry a wide selection of permanently mounted golf club head/shaft combinations (which takes up a considerable amount of storage space and inventory costs) or the club fitter or professional must build new clubs for the customer as the fitting process continues (which takes a substantial amount of time and inventory costs). The disadvantages associated with these conventional options serve to limit the choices available to the golfer during a fitting session and/or significantly increase the expense and length of a session.
The following presents a general summary of aspects of the invention in order to provide a basic understanding of the invention and various features of it. This summary is not intended to limit the scope of the invention in any way, but it simply provides a general overview and context for the more detailed description that follows.
Aspects of this invention are directed to orientation markers for golf clubs of the type which have releasable and interchangeable head and shaft connections. The orientation marker provides information with respect to at least the relative orientation between the golf club head and shaft. A separate key member provides additional information with respect to the relative orientation between the golf club head and the shaft, such as a predicted effect on ball flight for a particular head/shaft orientation. The orientation marker may be located, for example, on the golf club head or shaft. The key member may be located, for example, on the golf club head, shaft, or grip portion, or on a head cover for the golf club head.
A more complete understanding of the present invention and certain advantages thereof may be acquired by referring to the following detailed description in consideration with the accompanying drawings, in which:
The reader is advised that the attached drawings are not necessarily drawn to scale.
In the following description of various example structures, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various example connection assemblies, golf club heads, and golf club structures. Additionally, it is to be understood that other specific arrangements of parts and structures may be utilized, and structural and functional modifications may be made without departing from the scope of the present invention. Also, while the terms “top,” “bottom,” “front,” “back,” “rear,” “side,” “underside,” “overhead,” and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein as a matter of convenience, e.g., based on the example orientations shown in the figures and/or the orientations in typical use. Nothing in this specification should be construed as requiring a specific three dimensional or spatial orientation of structures.
A. General Description of Golf Club Head/Shaft Connection Assemblies and Golf Clubs Including Such Assemblies
In general, as described above, the orientation marker may be used together with golf clubs of the type in which the club head and shaft are connected in a releasable manner so that the club head and shaft can be readily interchanged and/or repositioned with respect to one another, or which have other characteristics that may be alterable. Non-limiting examples of golf clubs of this type and methods of assembling the same are described in U.S. application Ser. No. 11/774,522, filed Jul. 6, 2007 and U.S. application Ser. No. 12/177,778, filed Jul. 22, 2008, the disclosures of which are hereby incorporated by reference in their entireties. Other non-limiting examples of golf clubs in which the club head is repositionable with respect to the shaft are shown in Wettlaufer U.S. Pat. No. 2,219,670 and Reenstierna U.S. Pat. No. 2,326,495, the disclosures of which are hereby incorporated by reference in their entireties.
1. Example Golf Club Head/Shaft Connection Assemblies and Golf Club Structures
The golf club head/shaft connection assemblies may be adapted for securely but releasably connecting a golf club head and shaft. Such assemblies may include, for example: (a) a shaft engaging member including an opening providing access to a cylindrical interior chamber for receiving a golf club shaft and a rotation-inhibiting structure extending in an axial direction away from the opening and the cylindrical interior chamber; (b) a club head engaging member including an opening providing access to an interior chamber for releasably receiving (and holding) at least a portion of the shaft engaging member, wherein the interior chamber of the club head engaging member includes a retaining structure for engaging the rotation-inhibiting structure; and (c) a securing system for releasably securing the shaft engaging member with respect to the club head engaging member. The assemblies further may include a retaining element engaged with at least one of the shaft engaging member and the club head engaging member.
The rotation-inhibiting structure(s) of the shaft engaging member may take on a wide variety of forms in golf club head/shaft connection assemblies. In some example structures, the rotation-inhibiting structure will have a polygon cross section (e.g., a polygon having 18 or fewer sides, and in some examples, a polygon having 12 or fewer sides, 10 or fewer sides, eight or fewer sides, six or fewer sides, or even four or fewer sides), and it will fit into a retaining structure (e.g., an opening or chamber in the club head engaging member) having a size and shape adapted to inhibit rotation of the shaft engaging member with respect to the club head engaging member (e.g., having the same general polygon shape). In some more specific example structures, the rotation-inhibiting structure of the shaft engaging member will have a square or rectangular cross section and the retaining structure of the club head engaging member will include a square or rectangular shaped opening that receives the rotation-inhibiting structure.
The rotation-inhibiting structure of the shaft engaging member also may take on a variety of different sizes and constructions without departing from this invention. In some example structures, the shaft engaging member will be generally cylindrical with an open circular cylindrical chamber for receiving a golf club shaft. The rotation-inhibiting structure may extend beyond this open chamber in the general axial direction of the overall shaft engaging member structure. In some examples, the rotation-inhibiting structure of the shaft engaging member will extend less than 50% of an overall axial length of the shaft engaging member, and it may extend less than 35%, less than 25%, or even less than 15% of the overall axial length of the shaft engaging member. This feature can help keep the overall connection assembly relatively short, compact, and lightweight.
As a more specific example, golf club head/shaft connection assemblies may include: (a) a shaft engaging member having a first end and a second end, wherein the first end includes an opening providing access to a cylindrical interior chamber for receiving a golf club shaft, wherein an exterior surface of the first end includes an extending portion extending in a radial direction away from the cylindrical interior chamber, and wherein an exterior surface of the second end located beyond the cylindrical interior chamber includes a rotation-inhibiting structure; (b) a club head engaging member having a first end and a second end, wherein the first end of the club head engaging member includes an opening for releasably receiving the shaft engaging member, wherein the first end of the club head engaging member further includes a securing structure, and wherein an interior of the second end of the club head engaging member includes a rotation-inhibiting structure for engaging the rotation-inhibiting structure of the shaft engaging member; and (c) a securing member extending over the extending portion of the shaft engaging member and releasably engaging with the securing structure of the club head engaging member, wherein the securing member, at least in part, releasably secures the shaft engaging member with the club head engaging member. Such assemblies also may have one or more of the various more specific features or characteristics described above.
In some example golf club head/shaft connection assemblies, the second end of the club head engaging member further may include a portion extending beyond the rotation-inhibiting structure of the club head engaging member and the second end of the shaft engaging member may include a projection extending beyond its rotation-inhibiting structure (the projection may extend into the portion of the club head engaging member extending beyond its rotation-inhibiting structure). An additional retaining element may be provided, extending into the portion of the club head engaging member extending beyond its rotation-inhibiting structure, and this retaining element may engage the projection and/or the portion of the club head engaging member extending beyond its rotation-inhibiting structure. Alternatively, if desired, the retaining element may be integrally formed as a unitary structure with the club head engaging member.
The club head/shaft connection assemblies may include a golf club shaft engaged with the shaft engaging member and a club head body engaged with the club head engaging member. The shaft and club head engaging members then are engaged together (e.g., by sliding the shaft engaging member into the interior chamber defined by the club head engaging member and engaging their rotation-inhibiting structures together), and the overall assembly may be releasably secured together (e.g., by engaging a securing member with the club head engaging member and/or the shaft engaging member, or by another releasable mechanical fastener connection), as will be described in more detail below.
B. General Description of Position/Angle Adjustable Golf Club Head/Shaft Connection Assemblies and/or Golf Clubs
Systems and methods for connecting golf club heads to shafts in a releasable manner enable the club heads and shafts to be readily interchanged and/or the position and/or angle of the club head (e.g., the ball striking face) with respect to the shaft to be readily adjusted. More detailed descriptions of these aspects follow.
1. Example Position/Angle Adjustable Golf Club Head/Shaft Connection Assemblies and/or Golf Club Structures
Example golf club head/shaft connection assemblies may include: (a) a shaft engaging member including an exterior surface and an open first end that define an interior chamber for receiving a golf club shaft, wherein the exterior surface extends in a first axial direction and the interior chamber extends in a second axial direction that differs from the first axial direction; (b) a club head engaging member including an opening providing access to an interior chamber for releasably receiving at least a portion of the shaft engaging member; and (c) a system for preventing rotation of the shaft engaging member with respect to the club head engaging member. With such assemblies, the shaft position and/or angle with respect to the club head (and its ball striking face) may be adjusted by rotating the shaft engaging member with respect to the club head engaging member.
These club head/shaft connection assemblies may have any of the more detailed structures and/or features described above. Moreover, such assemblies may be included as part of golf club structures in the same manner described above.
As another example, golf club structures may include shafts having one or more bends or other axial direction changes in them. Such golf club structures may include: (a) a shaft including at least one shaft axial direction change region; (b) a shaft engaging member engaged with the shaft such that the shaft axial direction change region is located external to the shaft engaging member, wherein the shaft engaging member includes a rotation-inhibiting structure; (c) a club head engaging member releasably engaged with the shaft engaging member, wherein the club head engaging member includes a retaining structure engaged with the rotation-inhibiting structure to prevent rotation of the club head engaging member with respect to the shaft engaging member; (d) a golf club head engaged with the club head engaging member; and (e) a securing system for releasably securing the club head engaging member with respect to the shaft engaging member. The club head/shaft connection assemblies may have any of the more detailed structures and/or features described above. Moreover, such assemblies may be included as part of golf club structures, e.g., in the same manners described above.
Any desired materials also may be used for the shaft member 106, including conventional materials that are known and used in the art, such as steel, graphite, polymers, composite materials, combinations of these materials, etc. Optionally, if necessary or desired, the shaft may be modified (e.g., in size, shape, etc.) to accommodate the releasable club head/shaft connection parts. The grip member 108 may be engaged with the shaft 106 in any desired manner, including in conventional manners that are known and used in the art (e.g., via cements or adhesives, via mechanical connections, etc.). Any desired materials may be used for the grip member 108, including conventional materials that are known and used in the art, such as rubber, polymeric materials, cork, rubber or polymeric materials with cord or other fabric elements embedded therein, cloth or fabric, tape, etc. Optionally, if desired, the grip member 108 may be releasably connected to the shaft 106 using a releasable connection like releasable connection 104 (examples of which will be described in more detail below).
The releasable connection 104 between golf club heads and shafts now will be described in more detail in conjunction with
The shaft engaging member 220 of this example structure 104 includes a cylindrical interior chamber 222 that may be fit over the free end 106a of the shaft 106 and may be secured thereto in any desired manner, e.g., via cements or adhesives; via welding, brazing, soldering, or other fusing techniques; via mechanical connectors; via a friction fit; etc. The securing member 240 fits over the free end 106a of the shaft 106 and is located along the shaft 106 above the shaft engaging member 220. The securing member 240 opening 242 is sized so as to be rotatable around the exterior of the shaft 106 for reasons to be described in more detail below.
Once the securing member 240 and the shaft engaging member 220 are engaged with the shaft 106 and the club head engaging member 200 (optionally including the retaining element 260) is engaged with the club head 102, the overall connection 104 then may be assembled. This is accomplished in this example connection structure 104 by sliding the shaft engaging member 220 into the interior chamber of the club head engaging member 200. As the shaft engaging member 220 slides through the club head engaging member 200, the projection portion 224 of the shaft engaging member 220 will extend into the bottom interior chamber portion 204 of the club head engaging member 200 and engage the interior chamber 264 of the retaining member 260. At this configuration, the rotation-inhibiting structures 226 of the shaft engaging member 220 will engage corresponding rotation-inhibiting structure 206 of the club head engaging member 200 to thereby prevent the shaft 106 from rotating with respect to the club head 102 (the retaining member 260 in this example structure 104 helps prevent any substantial “play” or movement of the shaft 106 with respect to the club head 102, e.g., due to tolerances in the rotation-inhibiting structures 206 and 226). The securing member 240 then slides down the shaft 106, over the upper end of the shaft engaging member 220, and threadingly engages threaded securing structures 208 provided on the club head engaging member 200. Other releasable mechanical connection systems are possible without departing from this invention. Also, the various steps in this example assembly procedure may be changed, combined, changed in order, etc., without departing from this invention.
To release the connection 104, the threaded (or other) securing member 240 is released from the club head engaging member 200, which allows the shaft engaging member 220 to be slid out of the club head engaging member 200 (the shaft engaging member 220 and the securing member 240 remain on the shaft 106 and the club head engaging member 200 and the retaining member 260 remain in the club head 102). In this manner, a different shaft can be quickly and easily engaged with the same club head 102 and/or a different club head can be quickly and easily engaged with the same shaft 106.
The various individual parts of this example connection structure 104 now will be described in more detail in conjunction with
The club head/shaft securing member 240 is illustrated in more detail in
The various parts of the club head/shaft connection system 104 may be made from any desired or suitable materials without departing from this invention. For example, one or more of the various parts 200, 220, and/or 240 may be made from a metal material, including lightweight metals conventionally used in golf club head constructions, such as aluminum, titanium, magnesium, nickel, alloys of these materials, steel, stainless steel, and the like, optionally anodized finished materials. Alternatively, if desired, one or more of the various parts 200, 220, and/or 240 may be made from rigid polymeric materials, such as polymeric materials conventionally known and used in the golf club industry. The various parts 200, 220, and 240 may be made from the same or different materials without departing from this invention. In one specific example, each of the various parts 200, 220, and 240 will be made from a 7075 aluminum alloy material having a hard anodized finish. The parts may be made in conventional manners as are known and used in the metal working and/or polymer production arts.
Many variations in the connection system may be made from the specific structures described above without departing from this invention. For example, if desired, the securing member (e.g., like member 240) may be fit onto the club head structure 102 (e.g., around the hosel), and it may engage external threads (or other securing structures) provided on the shaft engaging member 220. Releasable securing systems other than threaded engagements of a securing member 240 with the club head engaging member 200 and/or the shaft engaging member 220 are possible without departing from this invention. For example, the securing member 240 may include structures that extend into or otherwise engage the club head engaging member 200 and/or the shaft engaging member 220 to thereby hold these members in place with respect to one another. As another example, if desired, the securing member 240 may include slots, openings, or grooves that provide access to structures extending from the club head engaging member 200 and/or the shaft engaging member 220 to thereby hold these members in place with respect to one another. As yet another example, if desired, the separate securing member 240 may be omitted, e.g., if the club head engaging member 200 and/or the shaft engaging member 220 directly include adequate structures to hold themselves in place with respect to one another. The securing member 240 also may be integrally formed or connected with another part of the connection structure 104, the club head 102, and/or the shaft 106.
As another example, the rotation-inhibiting portions 206 and 226 may take on a variety of different structures, such as polygon structures having 20 sides or less, 16 sides or less, 12 sides or less, 10 sides or less, 8 sides or less, or even 6 sides or less. The rotation-inhibiting opening 206 need not exactly match the shape of the rotation-inhibiting structure 226, provided the rotation-inhibiting structure 226 engages some portion of the rotation-inhibiting opening 206 so as to prevent undesired rotation of the shaft engaging member 220 with respect to the club head engaging member 200. Other rotation-inhibiting structures and arrangements also are possible without departing from this invention. For example, either or both of the shaft engaging member 220 and the club head engaging member 200 may include mechanical structures that engage the other part or other parts of the overall golf club so as to prevent rotation. As some more specific examples, the shaft engaging member may include spring loaded pins or other extending structures that extend into openings, slots, or ridges provided in the club head engaging member (and/or vice versa) (e.g., akin to attachment of hydraulic hoses to their hydraulic oil supply connection elements). Detent mechanisms and other physical (and optionally static) securing structures that fit into openings, slots, or ridges also may be used as a releasable rotation-inhibiting connection without departing from this invention.
Additional aspects relate to utilizing releasable golf club head/shaft connection assemblies to enable club fitters (or others) to adjust various positions and/or angles of the club head (and its ball striking face) with respect to the free (grip) end of the shaft (e.g., lie angle, loft angle, etc.).
As evident from a comparison of
The axial direction change region 708 may be located at any desired position along the shaft 702 without departing from this invention. In at least some example structures 700 according to this invention, the axial direction change region 708 will be located in the lower half of the shaft 702 nearer to the club head 102 than to the grip end. In some more specific examples, the axial direction change region 708 will be located in the lower quarter of the shaft 702 nearest to the club head 102, and even in the lower 10% or 5% of the shaft 702 nearest to the club head 102. In some example structures 700 according to the invention, the bend or other axial direction change region 708 may be located as close to the securing member 240 or other portion of the connection assembly as possible while still leaving a sufficient distance from the end of the shaft 702 so as to allow free movement of the securing member 240 or other securing mechanism. Alternatively, if desired, the securing member 240 or other securing mechanism may be sized and arranged so as to slip over the axial direction change region 708, and/or it may be releasable from, removable from, and/or attachable to the shaft 702 or other portion of the assembly 104 in another manner.
Also, any desired axial direction change θ (or bend) angle may be used without departing from this invention, e.g., at least 0.25 degrees, at least 0.5 degrees, at least 1 degree, at least 2 degrees, at least 4 degrees, or even at least 8 degrees. In some example structures, this bend or other axial direction change will be between 0.25 and 25 degrees, between 0.5 and 15 degrees, between 1 and 10 degrees, or even between 1 and 5 degrees.
As noted above,
The golf club shafts are not limited to having a single axial direction change region. Rather, as illustrated by the structure 800 shown in
The axial direction change regions 804 and 806 in the various structures (e.g., structures 800 and 820) may be located at any desired positions along the shafts 802 and/or 822 and/or at any desired relative spacing with respect to one another without departing from this invention. In at least some example structures 800 and/or 820 according to this invention, at least one of the axial direction change regions 804 and 806 (and optionally both) will be located in the lower half of the shaft 802 and/or 822 nearer to the club head 102 than to the grip end. In some more specific examples, one or both of the axial direction change regions 804 and 806 will be located in the lower quarter of the shaft 802 and/or 822 nearest to the club head 102, and even in the lower 10% or 5% of the shaft 802 and/or 822 nearest to the club head 102. The axial direction change regions 804 and 806 may be separated from one another by at least ½ inch, at least 1 inch, at least 2 inches, or even at least 4 inches or more without departing from this invention. The bends or other axial direction change regions 804 and 806 may be located a sufficient distance from the end of the shaft 802 and/or 822 and/or from one another so as to allow free movement of the securing member 240 or other securing mechanism, if necessary. Alternatively, if desired, the securing member 240 or other securing mechanism may be sized and arranged so as to slip over one or both of the axial direction change regions 804 and/or 806, and/or it may be releasable from, removable from, and/or attachable to the shaft 802 and/or 822 or other portion of the assembly 104 in another manner.
Also, any desired axial direction change (or bend) angles may be used for each of the two (or more) direction changes without departing from this invention, e.g., at least 0.25 degrees, at least 0.5 degrees, at least 1 degree, at least 2 degrees, at least 4 degrees, or even at least 8 degrees. In some example structures, like those shown in
Like the structure 700 described above in conjunction with
Utilizing a shaft including one or more axial direction change regions is not the only manner in which the position and/or angle of the free (grip) end of a shaft may be altered with respect to a golf club head and/or its ball striking face.
While any desired angle may be maintained between the first axial direction 926 and the second axial direction 930, in accordance with some examples of this invention, this angle will be between 0.25 degrees and 10 degrees, and in some examples between 0.5 degrees and 8 degrees, between 0.75 degrees and 6 degrees, or even between 1 degree and 4 degrees.
If desired, the shaft engaging member 920 described above may be used in connection with a shaft connection assembly similar to those described above in conjunction with
Also, while this specific structure has been described in conjunction with the figures, golf club head/shaft connection structure, and terminology used above in
Moreover, the use of an off-axis or angled bore member to alter the club head/shaft angle and/or position characteristics is not limited to use of an off-axis or angled bore in a shaft engaging member. Rather, if desired, the club head engaging member and/or the club head hosel may have an angled bore for receiving the shaft assembly, and the club head/shaft angle and/or position characteristics may be selectively altered by changing the orientation of the club head engaging member and/or the club head hosel with respect to other portions of the overall structure.
Many variations in the overall structure of the shaft, club head, and club head/shaft connection assembly are possible without departing from this invention. For example, if desired, the structure 104 may be somewhat “inverted” such that the securing member 240 is located on the club head (e.g., around the hosel) and it engages the shaft, the shaft engaging member, and/or the club head engaging member to hold the various parts together. Moreover, if desired, the connection system 104 may be used to connect shafts to other elements of a golf club (or other) structure, such as connecting a golf club shaft to a grip element.
An example of an alternative club head/shaft connection assembly is shown in
Specifically,
Receiving mechanism 220 proximate to the exterior portion of the golf club head 200 may be configured to receive and secure a shaft retainer 500. As shown in
As the shaft adapter 300 slides into the club head 102, the rotation-inhibiting structures 225 of the head 102 will engage corresponding rotation-inhibiting structures 315 of the shaft adapter 300 to thereby prevent the shaft 106 from rotating with respect to the club head 102. The retaining member 335 of the shaft adapter 300 in this example assembly 104, along with its covering retaining portion 602 (such as a plastic or rubber washer or grommet) helps prevent any substantial “play” or movement of the shaft 106 with respect to the club head 102, e.g., due to tolerances in the rotation-inhibiting structures 225 and 315. Specifically, the retaining member 335 and its previously attached retaining portion 602 (if any) slide into and fit within the retaining portion 230 of the interior chamber of the head 102. As shown in
C. General Description of the Orientation Marker
In some aspects, a golf club may have an orientation marker that provides information concerning the relative orientation between the golf club head and the shaft. The orientation marker may be located on the golf club, such as on the golf club head or the shaft. The orientation marker includes indicia or other suitable markings to distinguish relative club head/shaft orientations from one another. For example, for a golf club having two, three, four, five, six, seven, eight, or more predetermined club head/shaft orientations, the orientation marker may simply include numeric indicia (e.g., 1, 2, 3, . . . ) to designate each of the predetermined club head/shaft orientations.
The indicia or other markings of the orientation marker may be in various other forms, such as alphanumeric indicia, colors, symbols, or a combination of alphanumeric indicia, numeric indicia, colors, and symbols.
D. General Description of the Key Member
In some aspects, a key member provides additional information with respect to one or more of the available relative club head/shaft orientations. The key member may be located, for example, on the golf club head, shaft, or grip portion, or on a head cover for the club head. The key member contains graphics, indicia, and/or other markings that convey information with respect to the club head/shaft orientation. For example, the key member may include a graphical depiction of ball flight, alphanumeric indicia, colors, symbols, or any combination thereof.
In addition to indicia on the key member being color-coded as described above, the key member itself may be color-coded to indicate other characteristics of the golf club, such as shaft flex characteristics. For example, key members 490 having a yellow background may be used to identify shafts having a moderate balance between butt and tip stiffness. Such shafts typically are neutral with respect to ball flight characteristics. Key members 490 having a red background may be used to identify shafts having a relatively stiff tip section, which generally produce a lower ball flight and less spin by delivering the club head with less lead at impact. Key members 490 having a green background may be used to identify shafts that have a relatively weaker or softer tip section. Such shafts typically promote a higher ball flight by delivering the club with more lead at impact (more loft), and generally increase spin. In addition to color coding, the key member 490 may include other indicia to provide additional information on the butt and/or tip stiffness, such as numeric designations.
Instead of or in addition to a key member having graphical indicia as described above, the key member may be in the form of a table or the like. Such a key member may be affixed to or otherwise provided on the shaft, grip portion, or club head of a golf club, or affixed to or otherwise provided on a golf club head cover. An example of a tabular key member is shown below. Each row (corresponding to a different relative club head/shaft orientation) may have a background with a distinctive color. The background color may correspond to the colors used in the medallion 390 and/or the orientation marker as discussed above.
While the invention has been described in detail in terms of specific examples including presently preferred modes of carrying out the invention, those skilled in the art will appreciate that there are numerous variations and permutations of the above described systems and methods. Thus, the spirit and scope of the invention should be construed broadly as set forth in the appended claims.
The present application is a divisional of U.S. application Ser. No. 12/193,619 filed Aug. 18, 2008, which is hereby incorporated by reference in its entirety.
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| Number | Date | Country | |
|---|---|---|---|
| 20100216566 A1 | Aug 2010 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12193619 | Aug 2008 | US |
| Child | 12769909 | US |
