Patent Application
20230356038
When a golf club head strikes a golf ball, a force is seen on the club head at the point of impact. If the point of impact is aligned with the center face of the golf club head in an area of the club face typically called the sweet spot, then the force has minimal twisting or tumbling effect on the golf club. However, if the point of impact is not aligned with the center face, outside the sweet spot for example, then the force can cause the golf club head to twist around the center face. This twisting of the golf club head causes the golf ball to acquire spin. For example, if a typical right handed golfer hits the ball near the toe of the club this can cause the club to rotate clockwise when viewed from the top down. This in turn causes the golf ball to rotate counter-clockwise which will ultimately result in the golf ball curving to the left. This phenomenon is what is commonly referred to as “gear effect.”
Bulge and roll are golf club face properties that are generally used to compensate for this gear effect. The term “bulge” on a golf club typically refers to the rounded properties of the golf club face from the heel to the toe of the club face.
The term “roll” on a golf club typically refers to the rounded properties of the golf club face from the crown to the sole of the club face. When the club face hits the ball, the ball acquires some degree of backspin. Typically this spin varies more for shots hit below the center line of the club face than for shots hit above the center line of the club face.
Golf club alignment features, such as golf club head toplines, are currently painted in an imprecise manner. To paint an alignment feature on a golf club head, workers manufacturing the golf club head typically apply masking stickers that provide for a guide in painting the alignment feature. However, masking stickers and other guides are not easily affixed or aligned on the golf club head consistently. Because the location of the masking stickers ultimately determines the alignment feature shape and angle, the current manufacturing methods lead to variability between golf club heads manufactured to the same specifications, and consequently, variability in the performance of the product.
This disclosure relates to golf clubs. More specifically, this disclosure relates to golf club alignment.
Aspects of the invention are directed to golf club heads including a body having a face, a crown and a sole together defining an interior cavity, the golf club body including a heel and a toe portion and having x, y and z axes which are orthogonal to each other having their origin at USGA center face and wherein the golf club head has a primary alignment feature comprising a paint or masking line which delineates the transition between at least a first portion of the crown having an area of contrasting shade or color with the shade or color of the face.
In some embodiments the golf club head includes a body having a face, a sole and a crown, the crown having a first portion having a first color or shade and a second portion having a second color or shade, the face crown and sole together defining an interior cavity, the golf club body including a heel and a toe portion and having x, y and z axes which are orthogonal to each other having their origin at USGA center face and wherein the golf club head has a primary alignment feature comprising a paint or masking line which delineates the transition between at least a first portion of the crown having an area of contrasting shade or color and the area of shade or color of the face, and the club head also includes a secondary alignment feature including a paint or masking line which delineates the transition between the first portion of the crown having an area of contrasting shade or color with the shade or color of the face; and a second portion of the crown having an area of contrasting shade or color with the shade or color of the first portion, the secondary alignment feature comprising a first elongate side having a length of from about 0.5 inches to about 1.7 inches, and a second and third elongate side extending back from the face and rearward from and at an angle to the first elongate side.
In some embodiments the golf club heads have a body having a face, a crown and a sole together defining an interior cavity, the golf club body also includes a heel and a toe portion and a portion of the crown comprises an electronic display, wherein the electronic display includes an organic light-emitting diode (OLED) display for providing active color and wherein the OLED display is divided into independently operating electronic display zones.
In some embodiments the golf club heads have a body having a face, a crown and a sole together defining an interior cavity, the golf club body also includes a heel and a toe portion and a portion of the crown or a layer covering at least a portion of the crown of the golf club head is covered by a dielectric coating system.
In some embodiments, a golf club head is provided with a golf club body. The golf club body has a face, a crown and a sole, together defining an interior cavity. The golf club body also includes a heel and a toe portion, and has an x, y and z axes which are orthogonal to each other having their origin at USGA center face. At least one of the sole, crown, or face may be at least in part a composite material. The golf club head further has a primary alignment feature comprising a paint or masking line which delineates a transition between at least a first portion of the crown having an area of contrasting shade or color with a shade or color of the face and a CGx of 0 to about −4 mm. The primary alignment feature has a Sight Adjusted Perceived Face Angle (SAPFA) of from about −2 to about 10 degrees, a Sight Adjusted Perceived Face Angle 25 mm Heelward (SAPFA25H) of from about −5 to about 2 degrees, a Sight Adjusted Perceived Face Angle 25 mm Toeward (SAPFA25T) of from 0 to about 9 degrees, a Sight Adjusted Perceived Face Angle 50 mm Toeward (SAPFA50T) of from about 2 to about 9 degrees, and a Radius of Curvature (circle fit) of from about 300 to about 1000 mm.
In some embodiments, score lines are provided in a location on the face corresponding to center of gravity at the negative location with respect to the x-axis.
In some embodiments, a toe side roll contour is more lofted than the center face roll contour, a heel side roll contour is less lofted than the center face roll contour, a crown side bulge contour is more open than the center face bulge contour, and a sole side bulge contour is more closed than the center face bulge contour.
In some embodiments, the golf club body has a discretionary mass on the sole positioned at an angle with respect to the striking face, the discretionary mass positioned toeward along the negative x-axis and rearward along the positive y-axis.
The features and components of the following figures are illustrated to emphasize the general principles of the present disclosure. Corresponding features and components throughout the figures may be designated by matching reference characters for the sake of consistency and clarity.
Disclosed are various golf clubs as well as golf club heads including alignment features along with associated methods, systems, devices, and various apparatus. It would be understood by one of skill in the art that the disclosed golf clubs and golf club heads are described in but a few exemplary embodiments among many. No particular terminology or description should be considered limiting on the disclosure or the scope of any claims issuing therefrom.
The sport of golf is fraught with many challenges. Enjoyment of the game is increased by addressing the need to hit the golf ball further, straighter, and with more skill. As one progresses in golfing ability, the ability to compete at golf becomes a source of enjoyment. However, one does not simply hit a golf ball straighter or further by mere desire. Like most things, skill is increased with practice be it repetition or instruction so that certain elements of the game become easier over time. But it may also be possible to improve one's level of play through technology.
Much technological progress in the past several decades of golf club design has emphasized the ability to hit the golf ball further. Some of these developments include increased coefficient of restitution (COR), larger golf club heads, lighter golf club heads, graphite shafts for faster club speed, and center of gravity manipulation to improve spin characteristics, among others. Other developments have addressed a golfer's variability from shot-to-shot, including larger golf club heads, higher moment of inertia (MOI), variable face thickness to increase COR for off-center shots, and more. Still further developments address a golfer's consistent miss-hits—of which the most common miss-hit is a slice-including flight control technology (FCT), such as loft and lie connection sleeves to adjust, inter alia, face angle), moveable weights, sliding weight technologies, and adjustable sole pieces (ASP). Such technologies aid golfers in fixing a consistent miss, such that a particular error can be addressed.
As such, modern technology has done much to improve the golfer's experience and to tailor the golf club to the needs of the particular player. However, some methods are more effective than others at achieving the desired playing results. For example, research suggests that—for a drive of about 280 yards—a 1° difference in face angle at impact may account for about 16 yards of lateral dispersion in the resultant shot. Similarly, for moveable weights, changes in balance of weight by 12 grams moving for about 50 mm may result in about 15 yards of lateral dispersion on the resultant shot. However, it is also understood that a change in lie angle of the golf club head affects the face angle, but at a much smaller degree. As such, simply by increasing lie angle by 1°, the face angle alignment of the golf club head may be adjusted by 0.1° open or closed. As such, for better players who are simply trying to tune their ball flight, adjusting lie angle may be much more finely tunable than adjusting face angle. However, for many golfers, slicing (a rightward-curving shot for a right-handed golfer, as understood in the art) is the primary miss, and correction of such shot is paramount to enjoyment of the game.
One of the major challenges in the game of golf involves the difference between perception and reality. Golf includes psychological challenges—as the player's confidence wanes, his or her ability to perform particular shots often wanes as well. Similarly, a player's perception of his or her own swing or game may be drastically different from the reality. Some technology may address the player's perception and help aid in understanding the misconceptions. For example, technology disclosed in Error! Reference source not found., provides a player with a clearer understanding of his or her alignment than some of the preexisting art at the time, which may improve that player's ability to repeat his or her shots. However, it may be more helpful to provide those players a method to address the misconceptions and provide correction for them.
We have now surprisingly found that alignment features that includes all or a portion of the interface region between the areas of contrasting shade or color on the crown of the club head and the face of the club head and/or all or a portion of the interface region between areas of contrasting shade or color on different portions on the crown of the club head allows for improved performance in the resulting clubs by accounting for not only the actual alignment of the club head by the golfer during the shot but also as modified by the perceived alignment of the club head by the golfer. One example of a combination of contrasting colors or shades would be for example a black or metallic grey or silver color contrasting with white, but also included are other combinations which provide at a minimum a “just noticeable difference” to the human eye.
Although a “just noticeable difference” in terms of colors of a golf club head is to a degree somewhat subjective based on an individual's visual acuity, it can be quantified with reference to the CIELAB color system, a three dimensional system which defines a color space with respect to three channels or scales, one scale or axis for Luminance (lightness) (L) an “a” axis which extends from green (−a) to red (+a) and a “b” axis from blue (−b) to yellow (+b). This three dimensional axis is illustrated in
A color difference between two colors can then be quantified using the following formula;
ΔE*ab=√{square root over ((L*2−L*1)2+(a*2−a*1)2+(b*2−b*1)2)}
Thus, for the alignment features of the golf clubs of the present invention, a contrasting color difference, ΔE*ab, is greater than 2.3, preferably greater than 10, more preferably greater than 20, even more preferably greater than 40 and even more preferably greater than 60.
For general reference, a golf club head 100 is seen with reference to
The metal wood club head 100 has a volume, typically measured in cubic-centimeters (cm3), equal to the volumetric displacement of the club head 100, assuming any apertures are sealed by a substantially planar surface. (See United States Golf Association “Procedure for Measuring the Club Head Size of Wood Clubs,” Revision 1.0, Nov. 21, 2003). In other words, for a golf club head with one or more weight ports within the head, it is assumed that the weight ports are either not present or are “covered” by regular, imaginary surfaces, such that the club head volume is not affected by the presence or absence of ports. 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 130 cm3 and about 280 cm3, or between about 250 cm3 and about 500 cm3. In yet more specific embodiments, the head volume is between about 300 cm3 and about 500 cm3, between 300 cm3 and about 360 cm3, between about 360 cm3 and about 420 cm3, between about 390 cm3 and about 500 cm3, or between about 420 cm3 and about 500 cm3. In some embodiments, the head volume is between about 370 cm3 and about 500 cm3.
In the case of a driver, the golf club head has a volume between approximately 300 cm3 and approximately 460 cm3, and a total mass between approximately 145 g and approximately 245 g. In the case of a fairway wood, the golf club head 10 has a volume between approximately 100 cm3 and approximately 250 cm3, and a total mass between approximately 145 g and approximately 260 g. In the case of a utility or hybrid club the golf club head 10 has a volume between approximately 60 cm3 and approximately 150 cm3, and a total mass between approximately 145 g and approximately 280 g.
A three dimensional reference coordinate system 200 is shown. An origin 205 (CF) of the coordinate system 200 is located at the center of the face (CF) of the golf club head 100. See U.S.G.A. “Procedure for Measuring the Flexibility of a Golf Clubhead,” Revision 2.0, Mar. 25, 2005, for the methodology to measure the center of the striking face of a golf club. The coordinate system 200 includes a z-axis 206, a y-axis 207, and an x-axis 208 (shown in
As seen with reference to
Referring back to
For the sake of the disclosure, portions and references disclosed above will remain consistent through the various embodiments of the disclosure unless modified. One of skill in the art would understand that references pertaining to one embodiment may be included with the various other embodiments.
As seen with reference to
For reference, a face angle tangent 505 is seen in
The purpose of highlighting such features of the golf club head 500 is to provide a basis for the discussion of alignment with respect to the current disclosure. Through variations in alignment patterns, it may be possible to influence the golfer such that the golfer alters his or her play because of the appearance of misalignment. If a player perceives that the golf club head is such that the face is open with reference to the intended target, he or she would be more likely to try to “square up” the face by manually closing it. Many golfers prefer not to perceive a metal wood golf club head as appearing closed, as such an appearance is difficult to correct. However, even if such a player were to perceive the metal wood head as being closed, such perception does not mean that the golf club head is aligned in a closed position relative to the intended target.
As seen with reference to
In various embodiments, a perceived angle may be determined by finding a linear best-fit line of various points. For such approximation, a perceived angle tangent may be determined by best fitting points on the edge 614 at coordinates of the x-axis 208 that are coincident with center face 205—point 612—and at points ±5 mm of CF 205 (points 622a,b), at points ±10 mm of CF 205 (points 624a,b), at points ±15 mm of CF 205 (points 626a,b), and at points ±20 mm of CF 205 (points 628a,b). As such, nine points are defined along the edge 614 for best fit of the top tangent 610. In the current embodiment, the perceived angle tangent is the same as the top tangent 610.
However, such method for determining the perceived angle tangent may be most useful in cases where the edge 614 of an area of contrasting paint or shading of the crown 120 relative to the color or shading of the face 110 includes different radii of relief along the toe portion and the heel portion. In such an embodiment, a line that is tangent to the edge 614 at point 612 may not adequately represent the appearance of the alignment of the golf club head 600. Such an example can be seen with reference to
As seen in
A golf club head 800, as seen in
However, with sufficient use, the alignment feature 805 can become the primary focus of the golfer's attention and, as such, modifications to the arrangement of the alignment feature 805 with respect to the x-axis 208 (which is coincident with the face angle tangent 505) may allow the golfer to bias his or her shots and thereby modify his or her outcome.
As seen with reference to
For the embodiment including second elongate side 907b, the second elongate side 907b is about parallel to the elongate side 907a. As such, the embodiment is similar to golf club head 800 but is oriented at angle 915. With respect to extended rear portion 907c, the orientation of such an embodiment may appear less askew and, consequently, may be more effective at modifying the golfer's perception of the club's alignment. A perpendicular reference line 918 is seen as a reference for being orthogonal to the elongate side 907a. The perpendicular reference line 918 intersects the elongate side 907a at a point 919 that bisects the elongate side 907a. Further, the perpendicular reference line 918 intersects the x-axis 208 at an intersection point 921 that is heelward of the center face 205. In the current embodiment, the intersection point 921 is heelward of center face 205 by about 2 mm. In various embodiments, the intersection point 921 may be about the same as center face 205. In various embodiments, the intersection point 921 may be up to 2 mm heelward of center face 205. In various embodiments, the intersection point 921 may be up to 5 mm heelward of center face 205. In various embodiments, the intersection point 921 may be somewhat toeward of center face 205. In various embodiments, the intersection point 921 may be ±2 mm of the center face 205.
Another embodiment of a golf club head 1100, shown in
A preferred method for measuring the perceived face angle observed by a golfer further takes into account the fact that most golfers have a dominant left eye and when they address the ball with the club head, a direct line between the left eye and center face would actually cross the topline heel ward of center face and thus this is where an alignment feature which includes an edge of an area of contrasting paint or shading of the crown 120 relative to the color or shading of the face 110 would exert the most effect on the golfer's perception of the face angle. This perceived face angle is thus called a Sight Adjusted Perceived Face Angle (SAPFA) and is measured using the apparatus shown in
The apparatus used is shown in
As shown in
The image from the camera is then analyzed using an image analyzer software package (which can be any of these known in the art able to import an image and can fit a line to the image using a curve fitting function). A best fit line to the paint line is then determined. For most embodiments the best fit to the paint line results from fitting the line to a quadratic equation of the form y=ax2+bx+c. Two points are then selected on this best fit line at arc length between +/−0.25 mm from the datum point. A straight line is then drawn between the two points and a line perpendicular to this line is then drawn through the datum. The Sight Adjusted Perceived Face Angle (SAPFA) is then measured as the angle between the perpendicular line and the y axis.
Using this method the Sight Adjusted Perceived Face Angle (SAPFA) of the golf clubs of the present invention may be from −2 to 10, preferably from 0 to 6, more preferably from 0.5 to 4 even more preferably from 1 to 2.5 and most preferably from 1.5 to 2 degrees.
Four identical club heads were taken and the paint line edge of an area of contrasting paint or shading of the crown 120 relative to the color or shading of the face 110 was varied and the Sight Adjusted Perceived Face Angles (SAPFA) measured.
In addition to the Sight Adjusted Perceived Face Angles (SAPFA) four additional measurements were taken to describe the paint line edge alignment feature of the four clubs and these values are summarized in Table 1.
In addition to the SAPFA, three additional angles were measured at different points as measured from the datum along the best fit line to the paint line edge alignment feature determined as for the SAPFA. The first angle was obtained at a point along the best fit line at an arc length 25 mm heelward of the datum. Again as for the SAPFA measurement, two points at arc length between +/−0.25 mm from the 25 mm point were selected. A straight line is then drawn between these two points and a line perpendicular to this line is then drawn at the 25 mm point. The angle is then measured between this perpendicular line and the y axis. This angle is reported as the Sight Adjusted Perceived Face Angle 25 mm Heelward (“SAPFA25H”).
The second angle was obtained at a point along the best fit line at an arc length 25 mm toeward of the datum. Again as for the SAPFA measurement, two points at arc length between +/−0.25 mm from the 25 mm point were selected. A straight line is then drawn between the two points and a line perpendicular to this line is then drawn at the 25 mm point. The angle is then measured between this perpendicular line and the y axis. This angle is reported as the Sight Adjusted Perceived Face Angle 25 mm Toeward (“SAPFA25T”).
In addition, to capture any effect of greater rounding of the paint line edge alignment feature towards the toe of the golf club head, a third angle was obtained at a point along the best fit line at an arc length 50 mm toeward of the datum. Again as for the SAPFA measurement, two points at arc length between +/−0.25 mm from the 25 mm point were selected. A straight line is then drawn between the two points and a line perpendicular to this line is then drawn at the 50 mm point. The angle is then measured between this perpendicular line and the y axis. This angle is reported as the Sight Adjusted Perceived Face Angle 50 mm Toeward (“SAPFA50T”).
Finally, in an attempt to describe more of the paint line edge alignment feature, the image of the paint line edge alignment feature imported into the image analyzer as for the SAPFA measurement was also fit to a circle using the formula (x−a)2+(y−b)2=r2, and the radius of curvature of this circular fit line determined and reported in Table 1 as the Radius of Curvature (circle fit).
Each club was then hit between 6 to 12 times by 10 different players into a blank screen with no trajectory or other feedback available to the player, and a Trackman 3e launch monitor and the TPS software package were used to calculate the total dispersion from a center target line with a positive total dispersion indicating the number of yards right of the center target line and a negative total dispersion indicating the number of yards left of the center target line. Thus, a player who has a tendency to slice the ball i.e. produce a ball flight right of the target line would be assisted in producing a shot closer to the target line if the golf club tended to yield a more negative dispersion.
The graph in
The golf club heads of the present invention have a Sight Adjusted Perceived Face Angle (SAPFA) of from about −2 to about 10, preferably of from about 0 to about 6, more preferably of from about 0.5 to about 4 even more preferably of from about 1 to about 2.5 and most preferably of from about 1.5 to about 2 degrees.
The golf club heads of the present invention also have a Sight Adjusted Perceived Face Angle 25 mm Heelward (“SAPFA25H”) of from about −5 to about 2, more preferably of from about −3 to 0, even more preferably of from about −2 to about −1 degrees.
The golf club heads of the present invention also have a Sight Adjusted Perceived Face Angle 25 mm Toeward (“SAPFA25T”) of from 0 to about 9, more preferably of from about 1 to about 4.5, even more preferably of from about 2 to about 4 degrees.
The golf club heads of the present invention also have a Sight Adjusted Perceived Face Angle 50 mm Toeward (“SAPFA50T”) of from about 2 to about 9, more preferably of from about 3.5 to about 8, even more preferably of from about 4 to about 7 degrees.
The golf club heads of the present invention also have a Radius of Curvature (circle fit) of from about 300 to about 1000, more preferably of from about 400 to about 900, even more preferably of from about 500 to about 775 mm.
In other embodiments, the golf club head in addition to having a first or primary alignment feature as described earlier with reference to
In an especially preferred embodiment, shown in
The Sight Adjusted Perceived Face Angle Secondary Alignment Feature, (“SAPFASAF”) of the secondary alignment feature constituting elongate side 1406 and the second and third elongate sides 1408a and 1408b may be measured by importing the image of the club head obtained as per the measurement for the SAPFA. Points 1410b and 1410a are selected which are the innermost ends of the radii connecting lines 1408b and 1408a with elongate side 1406 as shown in
In some embodiments, the golf club heads of the present invention also have a Sight Adjusted Perceived Face Angle Secondary Alignment Feature, (“SAPFASAF”) of from about −2 to about 6, more preferably of from 0 to about 5, even more preferably of from about 1.5 to about 4 degrees.
The primary and secondary alignment features as described herein typically utilize paint lines which demark the edge of an area of contrasting paint or shading of the crown relative to the color or shading of the face. Preferably the contrasting colors are white in the crown area and black in the face area. Typically painting or shading of golf club heads is performed at the time of manufacture and thus are fixed for the lifetime of the club absent some additional painting performed after purchase by the owner. It would be highly advantageous if the profile of the alignment feature could be adjusted by the user using a simple method which would allow adjustment of the perceived face angle by the user in response to the golfer's observed ball direction tendency on any given day.
In some embodiments of the golf club heads of the present invention the crown comprises a rotatable or otherwise movable portion, with one side of said portion including the edge of an area of contrasting paint or shading of the crown relative to the color or shading of the face or the color or shading of the second portion of the crown which can be rotated or moved sufficient to yield the desired Perceived Face Angle, PFA and/or Sight Adjusted Perceived Face Angle (SAPFA) and/or Sight Adjusted Perceived Face Angle Secondary Alignment Feature, (“SAPFASAF”) to produce the desired ball flight. The movable portion of the crown is held in position by a fastening device such as a screw or bolt which is loosened to allow for rotation or movement and then subsequently tightened to fix the position of the crown after adjustment.
In addition to a portion of the crown being movable other embodiments include a movable layer or cover on top of the crown with one side of said movable layer or cover including the edge of an area of contrasting paint or shading of the crown relative to the color or shading of the face or the color or shading of the second portion of the crown which can be rotated or moved sufficient to yield the desired Perceived Face Angle, PFA and/or Sight Adjusted Perceived Face Angle (SAPFA) and/or Sight Adjusted Perceived Face Angle Secondary Alignment Feature, (“SAPFASAF”). The movable portion of the layer or cover is again held in position by a fastening device such as a screw or bolt or other fastening means which is loosened to allow for rotation or movement and then subsequently tightened to fix the position of the movable layer or cover after adjustment.
In other embodiments a portion of the crown may comprise electronic features which can be selectively activated to generate the required appearance including but not limited to light emitting diodes (LED), organic LED's (OLED), printed electronics with illumination devices, embedded electronics with illumination devices, electroluminescent devices, and so called quantum dots.
In other embodiments, a portion of the crown may comprise a coating that alters its characteristics when exposed to external conditions including but not limited to thermochromic coatings, photochromic coatings, electrochromic coatings and paramagnetic paint.
In one preferred embodiment, at least a portion of the crown of the golf club head or a layer covering at least a portion of the crown of the golf club head comprises an electronic graphic display. The display provides active color and graphic control for either the entire top portion of the crown or layer covering at least a portion of the crown or a portion thereof. The display may be constructed from flexible organic light-emitting diodes (OLED) displays, e-ink technology, digital fabrics, or other known means of active electronic color and graphic display means. For example, an organic light emitting diode (OLED) (e.g., a light emitting polymer (LEP), and organic electro luminescence (OEL)) is a light-emitting diode (LED) whose emissive electroluminescent layer is composed of a film of organic compounds. The layer usually contains a polymer substance that allows suitable organic compounds to be deposited in rows and columns onto a carrier substrate such as the at least a portion of the crown of the golf club head or a layer covering at least a portion of the crown of the golf club head, by a simple “printing” process. The resulting matrix of pixels can emit light of different colors.
In some embodiments, the at least a portion of the crown of the golf club head or a layer covering at least a portion of the crown of the golf club head is segmented into portions which may be controlled differently from each other. For example, one side of the alignment feature has a static surface color and the other side a second static and contrasting surface color display capability.
The display is operatively connected to a microprocessor disposed in the golf club head (e.g., via wires). The microprocessor is further operatively connected to a data port, for example a universal serial bus (USB) port (e.g., via wires). The data port allows transfer and retrieval of data to and from the microprocessor. Data ports and data transfer protocols are well known to one of ordinary skill in the art. The data port (USB port) may be disposed in the rearward area of the golf club head.
Data can be obtained from a variety of sources. In some embodiments, an Internet website is dedicated to support of the golf club head of the present invention. For example, the website may contain downloadable data and protocols (e.g., colors, color patterns, images, video content, logos, etc.) that can be uploaded into the microprocessor of the golf club head (via the data port, via a cable, via a computer). As an example, the website may have a gallery for choosing colors to be displayed, as well as patterns of the colors
In some embodiments, data can be uploaded from other sources, for example DVDs, CDs, memory devices (e.g., flash memory), and the like. Sources may also include cellular phones, smart phones, personal digital assistants (PDAs), digital vending kiosks, and the like. In some embodiments, the data can be uploaded and downloaded via other mechanisms, for example wired or wireless mechanisms. Such mechanisms may include Bluetooth™, infrared datalink (IrDa), Wi-Fi, UWB, and the like.
In some embodiments, one or more control buttons are disposed on the golf club head allowing a user to manipulate the display as desired. The control buttons are operatively connected to the microprocessor. The microprocessor is configured to receive input signals from the control buttons and further send output commands to manipulate the. The control buttons may be operatively connected to the display and/or the microprocessor via one or more wires.
The microprocessor and/or display are operatively connected to a power source, for example a battery. The battery may be rechargeable. In some embodiments, the battery comprises a control means for turning on and off the device. All wires and data ports and other electronic systems are adapted to sustain the impact forces incurred when a golfer hits a golf ball with the golf club head.
In other embodiments of the golf club heads of the present invention a method to accomplish user adjustably of the alignment feature would involve at least a portion of the crown of the golf club head or a layer covering at least a portion of the crown of the golf club head being covered by a dielectric electroluminescent coating system using as one example the materials and methods as described in U.S. Pat. No. 6,926,972 by M. Jakobi et al., issuing on Aug. 9, 2005 and assigned to the BASF Corporation, the entire contents of which are incorporated by reference herein. Using this technology an electric current (provided by a small battery fixed securely in the golf club head cavity) could be selectively employed to use electroluminescence to highlight (or eliminate) a particular color thereby adjusting the alignment feature orientation.
In some embodiments, the golf club head may include sensors, such as described in U.S. patent application Ser. No. 15/996,854, filed Jun. 4, 2018, which is incorporated herein by reference. For example, the golf club may include one or more sensors for measuring swing speed, face angle, lie angle, tempo, swing path, face angle to swing path relationships, dynamic loft, and shaft lean. Other measurements may include back stroke time, forward stroke time, total stroke time, tempo, impact stroke speed, impact location, back stroke length, back stroke rotation, forward stroke rotation, rotation change, lie, and loft. Further measurements may include golf shot locations during play and golf shot distance data. Additional and different measurements may also be captured. The measurements may be captured during a full swing, short game, putting, or during other golf swings.
The one or more sensors may include motion sensors, accelerometers, gyro sensors, magnetometers, global positioning system (GPS) sensors, optical markers, or other sensors. The one or more sensors may be attached to the golf club head, integrated into a display of the golf club, attached to or integrated into the shaft of the golf club (e.g., proximate to the butt end of golf club grip, along the shaft, or at another location), housed within the golf club grip, and/or attached to or integrated into another portion of the golf club. In an embodiment, multiple sensors are provided on the golf club, such as at the same or different portions of the golf club. For example, a first sensor may be attached to or integrated into the golf club head and a second sensor housed within the grip of the golf club or attached to the golf club shaft. Additional and different multiple sensor arrangements may be used.
In an embodiment, a display or another electronic feature of the golf club may display one or more of the measured values on the crown or another portion of the golf club head. For example, the display or another electronic feature may be a removable display device, or may integrated into user device, such as a PDA, smart phone, iPhone, iPad, iPod, or other computing device. The one or more measured values may be displayed using an application running on the display device or using a device associated with the display or other electronic feature of the golf club head. In some embodiments, the sensors may be configured to communicate with an external device, such as a computing device (e.g., personal computer (PC), laptop computer, tablet, smart phone, cell phone, iPhone, iPad, Personal Digital Assistant (PDA), server computer, or another computing device), a launch monitor, a club fitting platform, or another device. In these embodiments, the one or more measured values may be displayed using an application running on the external device. In some embodiments, the one or more sensors interact with an external device, such as a video camera, to capture one or more measured values.
Referring back to
In exemplary embodiments, a projected CG location on the striking face is considered the “sweet spot” of the club head. The projected CG location is found by balancing the clubhead on a point. The projected CG location is generally projected along a line that is perpendicular to the face of the club head. In some embodiments, the projected CGy (y-axis coordinate) location is less than 2 mm above the center face location, less than 1 mm above the center face, or up to 1 mm or 2 mm below the center face location 205. In some embodiments, the golf club head has a CG with a CGx (x-axis) coordinate between about −10 mm and about 10 mm from the center face location 205, a CGy between about 15 mm and about 50 mm, and a CGz (z-axis coordinate) between about −10 mm and about 5 mm. In some embodiments, the CGy is between about 20 mm and about 50 mm.
The golf club head also has moments of inertia defined about three axes extending through the golf club head CG orientation, including: a CGz extending through the CG in a generally vertical direction relative to the ground plane when the club head is at address position, a CGx extending through the CG in a heel-to-toe direction generally parallel to the striking face 110 and generally perpendicular to the CGz, and a CGy extending through the CG in a front-to-back direction and generally perpendicular to the CGx and the CGz. The CGx and the CGy both extend in a generally horizontal direction relative to the ground plane when the club head 100 is at the address position.
The moment of inertia about the golf club head CGx is calculated by the following equation:
I
CGx=∫(y+z2)dm
In the above equation, y is the distance from a golf club head CG xz-plane to an infinitesimal mass dm and z is the distance from a golf club head CG xy-plane to the infinitesimal mass dm. The golf club head CG xz-plane is a plane defined by the CGx and the CGz. The CG xy-plane is a plane defined by the CGx and the CGy.
The moment of inertia about the golf club head CGy is calculated by the following equation:
I
CGx=∫(x2+z2)dm
In the above equation, x is the distance from a golf club head CG yz-plane to an infinitesimal mass dm and z is the distance from a golf club head CG xy-plane to the infinitesimal mass dm. The golf club head CG yz-plane is a plane defined by the CGy and the CGz. The CG yx-plane is a plane defined by the CGy and the CGx.
Moreover, a moment of inertia about the golf club head CGz is calculated by the following equation:
I
CGz=∫(x2+y2)dm
In the equation above, x is the distance from a golf club head CG yz-plane to an infinitesimal mass dm and y is the distance from the golf club head CG xz-plane to the infinitesimal mass dm. The golf club head CG yz-plane is a plane defined by the CGy and the CGz.
In certain implementations, the club head can have a moment of inertia about the CGz between about 450 kg·mm2 and about 650 kg·mm2, and a moment of inertia about the CGx between about 300 kg·mm2 and about 500 kg·mm2, and a moment of inertia about the CGy between about 300 kg·mm2 and about 500 kg·mm2.
For a variety of reasons, it may be advantageous to orient the center of gravity (CG) of the golf club head toward the toe. For example, users often strike the golf ball high (e.g., +3 to +4 mm on the z-axis) and toeward (e.g., −5 to −7 mm on the x-axis) on the striking face. Striking the ball off-center (i.e., in a location different from the projected CG location on the striking face) generally decreases ball-speed, and as a result, decreases the distance traveled by the golf ball.
Further, as discussed above, striking the face toeward also produces a gear effect, producing hook spin. Increasing the negative CGx orientation (i.e., from −2 to −10 mm on the x-axis) may alter the gear effect by decreasing the counter-clockwise spin (i.e., for a right-handed golfer) which ultimately results in the golf ball curving to the left.
Additionally, in order to maximize the moment of inertia (MOI) about a z-axis extending through the CGz, a negative CGx orientation may be provided. Working in conjunction with the weight of the hosel of the golf club, a negative CGx orientation allows for greater MOI about the z-axis by strategically distributing club head weight on the x-axis at corresponding positive and negative orientations.
Alternatively, it may be advantageous to orient the CG of the golf club head toward the heel. For example, by increasing positive CGx orientation (i.e., from +2 mm to 0 mm on the x-axis), the club head may close faster (i.e., at 400-500 rpm), increasing local club head speed and producing more ball-speed, and as a result, increasing the distance traveled by the golf ball.
In certain implementations, the golf club head can have a CGx between about +2 and about −10 mm. For example, the CGx for a golf club head with adjustable weights (discussed below) is between about −3 mm to about −4 mm. In certain implementations, the club head can have a low CGz of less than 0, such as between 0 and about −4 mm. In certain implementations, the club head can have a CGz positioned below a geometric center of the face. In certain implementations, the club head can have a moment of inertia about the CGz (also referred to as “Izz”) above 400 kg·mm2, above 460 kg·mm2 or above 480 kg·mm2. A moment of inertia about the CGx (also referred to as “Ixx”) can be above 300 kg·mm2. The moments of inertia of the golf club head can also be expressed as a ratio, such as a ratio of Ixx to Izz. For example, in some embodiments, a ratio of Ixx to Izz is at most 0.6, or 60%. In an example, the golf club head can have an Ixx above 300 kg·mm2 and an Izz above 500 kg·mm2, such that Ixx/Izz is less than or equal to 0.6. In another example, the Ixx is greater than 280 kg·mm2 and the Izz is greater than 465 kg·mm2.
In certain implementations, the golf club head can have a Zup less than 30 mm. For example, above ground, an alternative club head coordinate system places the head origin at the intersection of the z-axis and the ground plane, providing positive z-axis coordinates for every club head feature. As used herein, “Zup” means the CG z-axis location determined according to this above ground coordinate system. Zup generally refers to the height of the CG above the ground plane as measured along the z-axis.
In certain implementations, the golf club head can have a Delta 1 (i.e., measure of how far rearward in the golf club head body the CG is located) greater than 20, such as greater than 26 in certain implementations. More specifically, Delta 1 is the distance between the CG and the hosel axis along the y axis (in the direction straight toward the back of the body of the golf club face from the geometric center of the striking face). It has been observed that smaller values of Delta 1 result in lower projected CGs on the golf club head face. Thus, for embodiments of the disclosed golf club heads in which the projected CG on the ball striking club face is lower than the geometric center, reducing Delta 1 can lower the projected CG and increase the distance between the geometric center and the projected CG. Note also that a lower projected CG can promote a higher launch and a reduction in backspin due to the z-axis gear effect. Thus, for particular embodiments of the disclosed golf club heads, in some cases the Delta 1 values are relatively low, thereby reducing the amount of backspin on the golf ball helping the golf ball obtain the desired high launch, low spin trajectory.
The United States Golf Association (USGA) regulations constrain golf club head shapes, sizes, and moments of inertia. Due to these constraints, golf club manufacturers and designers struggle to produce golf club heads having maximum size and moment of inertia characteristics while maintaining all other golf club head characteristics. For example, one such constraint is a volume limitation of 460 cm3. In general, volume is measured using the water displacement method. However, the USGA will fill any significant cavities in the sole or series of cavities which have a collective volume of greater than 15 cm3.
In some embodiments, as in the case of a fairway wood, the golf club head may have a volume between about 100 cm3 and about 300 cm3, such as between about 150 cm3 and about 250 cm3, or between about 130 cm3 and about 190 cm3, or between about 125 cm3 and about 240 cm3, and a total mass between about 125 g and about 260 g, or between about 200 g and about 250 g. In the case of a utility or hybrid club, the golf club head may have a volume between about 60 cm3 and about 150 cm3, or between about 85 cm3 and about 120 cm3, and a total mass between about 125 g and about 280 g, or between about 200 g and about 250 g. In the case of a driver, the golf club head may have a volume between about 300 cm3 and about 600 cm3, between about 350 cm3 and about 600 cm3, and/or between about 350 cm3 and about 500 cm3, and can have a total mass between about 145 g and about 1060 g, such as between about 195 g and about 205 g.
Historically, CGx locations were heelward about 4-6 mm. More recently, CGx locations have been moved toeward to about −1 mm. CGx locations will likely continue to be toeward, such as in the example CGx locations described in U.S. patent application Ser. No. 16/171,237, filed Oct. 25, 2018, which is incorporated herein by reference. For example, club head has a center of gravity (CG), the location of which may be defined in terms of the coordinate system described above and shown in
There are a variety of ways to position the CG orientations of the golf club head. For example, in some embodiments, a composite crown and/or sole is provided to help overcome manufacturing challenges associated with conventional golf club heads having normal continuous crowns made of titanium or other metals, and can replace a relatively heavy component of the crown with a lighter material, freeing up discretionary mass which can be strategically allocated elsewhere within the golf club head. In certain embodiments, the crown may comprise a composite material, such as those described herein and in the incorporated disclosures, having a density of less than 2 grams per cubic centimeter. In still further embodiments, the composite material has a density of no more than 1.5 grams per cubic centimeter, or a density between 1 gram per cubic centimeter and 2 grams per cubic centimeter. Providing a lighter crown further provides the golf club head with additional discretionary mass, which can be used elsewhere within the golf club head to serve the purposes of the designer. For example, with the discretionary mass, additional weight can be strategically added to the hollow interior of the golf club head, or strategically located on the exterior of the golf club head, to shift the effective CG fore or aft, toeward or heelward or both (apart from any further CG adjustments made possible by adjustable weight features), and/or to improve desirable MOI characteristics, as described above.
In some embodiments, the crown and/or sole may be formed in whole or in part from a composite material, such as a carbon composite, made of a composite including multiple plies or layers of a fibrous material (e.g., graphite, or carbon fiber including turbostratic or graphitic carbon fiber or a hybrid structure with both graphitic and turbostratic parts present. Examples of some of these composite materials for use in the metalwood golf clubs and their fabrication procedures are described in U.S. patent application Ser. No. 10/442,348 (now U.S. Pat. No. 7,267,620), Ser. No. 10/831,496 (now U.S. Pat. No. 7,140,974), Ser. Nos. 11/642,310, 11/825,138, 11/998,436, 11/895,195, 11/823,638, 12/004,386, 12/004,387, 11/960,609, 11/960,610, and 12/156,947, which are incorporated herein by reference.
Alternatively, the crown and/or sole may be formed from short or long fiber-reinforced formulations of the previously referenced polymers. Exemplary formulations include a Nylon 6/6 polyamide formulation which is 30% Carbon Fiber Filled and available commercially from RTP Company under the trade name RTP 285. The material has a Tensile Strength of 35000 psi (241 MPa) as measured by ASTM D 638; a Tensile Elongation of 2.0-3.0% as measured by ASTM D 638; a Tensile Modulus of 3.30×106 psi (22754 Mpa) as measured by ASTM D 638; a Flexural Strength of 50000 psi (345 Mpa) as measured by ASTM D 790; and a Flexural Modulus of 2.60×106 psi (17927 Mpa) as measured by ASTM D 790.
Also included is a polyphthalamide (PPA) formulation which is 40% Carbon Fiber Filled and available commercially from RTP Company under the trade name RTP 4087 UP. This material has a Tensile Strength of 360 Mpa as measured by ISO 527; a Tensile Elongation of 1.4% as measured by ISO 527; a Tensile Modulus of 41500 Mpa as measured by ISO 527; a Flexural Strength of 580 Mpa as measured by ISO 178; and a Flexural Modulus of 34500 Mpa as measured by ISO 178.
Also included is a polyphenylene sulfide (PPS) formulation which is 30% Carbon Fiber Filled and available commercially from RTP Company under the trade name RTP 1385 UP. This material has a Tensile Strength of 255 Mpa as measured by ISO 527; a Tensile Elongation of 1.3% as measured by ISO 527; a Tensile Modulus of 28500 Mpa as measured by ISO 527; a Flexural Strength of 385 Mpa as measured by ISO 178; and a Flexural Modulus of 23,000 Mpa as measured by ISO 178.
In other embodiments, the crown and/or sole is formed as a two layered structure comprising an injection molded inner layer and an outer layer comprising a thermoplastic composite laminate. The injection molded inner layer may be prepared from the thermoplastic polymers, with preferred materials including a polyamide (PA), or thermoplastic urethane (TPU) or a polyphenylene sulfide (PPS). Typically the thermoplastic composite laminate structures used to prepare the outer layer are continuous fiber reinforced thermoplastic resins. The continuous fibers include glass fibers (both roving glass and filament glass) as well as aramid fibers and carbon fibers. The thermoplastic resins which are impregnated into these fibers to make the laminate materials include polyamides (including but not limited to PA, PA6, PA12 and PA6), polypropylene (PP), thermoplastic polyurethane or polyureas (TPU) and polyphenylene sulfide (PPS).
The laminates may be formed in a continuous process in which the thermoplastic matrix polymer and the individual fiber structure layers are fused together under high pressure into a single consolidated laminate, which can vary in both the number of layers fused to form the final laminate and the thickness of the final laminate. Typically the laminate sheets are consolidated in a double-belt laminating press, resulting in products with less than 2 percent void content and fiber volumes ranging anywhere between 35 and 55 percent, in thicknesses as thin as 0.5 mm to as thick as 6.0 mm, and may include up to 20 layers. Further information on the structure and method of preparation of such laminate structures is disclosed in European patent No. EP1923420B1 issued on Feb. 25, 2009 to Bond Laminates GMBH, the entire contents of which are incorporated by reference herein.
The composite laminates structure of the outer layer may also be formed from the TEPEX® family of resin laminates available from Bond Laminates which preferred examples are TEPEX® dynalite 201, a PA66 polyamide formulation with reinforcing carbon fiber, which has a density of 1.4 g/cm3, a fiber content of 45 vol %, a Tensile Strength of 785 MPa as measured by ASTM D 638; a Tensile Modulus of 53 GPa as measured by ASTM D 638; a Flexural Strength of 760 MPa as measured by ASTM D 790; and a Flexural Modulus of 45 GPa) as measured by ASTM D 790.
Another preferred example is TEPEX® dynalite 208, a thermoplastic polyurethane (TPU)-based formulation with reinforcing carbon fiber, which has a density of 1.5 g/cm3, a fiber content of, 45 vol %, a Tensile Strength of 710 MPa as measured by ASTM D 638; a Tensile Modulus of 48 GPa as measured by ASTM D 638; a Flexural Strength of 745 MPa as measured by ASTM D 790; and a Flexural Modulus of 41 GPa as measured by ASTM D 790.
Another preferred example is TEPEX® dynalite 207, a polyphenylene sulfide (PPS)-based formulation with reinforcing carbon fiber, which has a density of 1.6 g/cm3, a fiber content of 45 vol %, a Tensile Strength of 710 MPa as measured by ASTM D 638; a Tensile Modulus of 55 GPa as measured by ASTM D 638; a Flexural Strength of 650 MPa as measured by ASTM D 790; and a Flexural Modulus of 40 GPa as measured by ASTM D 790.
There are various ways in which the multilayered composite crown may be formed. In some embodiments the outer layer, is formed separately and discretely from the forming of the injection molded inner layer. The outer layer may be formed using known techniques for shaping thermoplastic composite laminates into parts including but not limited to compression molding or rubber and matched metal press forming or diaphragm forming.
The inner layer may be injection molded using conventional techniques and secured to the outer crown layer by bonding methods known in the art including but not limited to adhesive bonding, including gluing, welding (preferable welding processes are ultrasonic welding, hot element welding, vibration welding, rotary friction welding or high frequency welding (Plastics Handbook, Vol. 3/4, pages 106-107, Carl Hanser Verlag Munich & Vienna 1998)) or calendaring or mechanical fastening including riveting, or threaded interactions.
Before the inner layer is secured to the outer layer, the outer surface of the inner layer and/or the inner of the outer layer may be pretreated by means of one or more of the following processes (disclosed in more detail in Ehrenstein, “Handbuch Kunststoff-Verbindungstechnik”, Carl Hanser Verlag Munich 2004, pages 494-504):
In an especially preferred method of preparation a so called hybrid molding process may be used in which the composite laminate outer layer is insert molded to the injection molded inner layer to provide additional strength. Typically the composite laminate structure is introduced into an injection mold as a heated flat sheet or, preferably, as a preformed part. During injection molding, the thermoplastic material of the inner layer is then molded to the inner surface of the composite laminate structure the materials fuse together to form the crown as a highly integrated part. Typically the injection molded inner layer is prepared from the same polymer family as the matrix material used in the formation of the composite laminate structures used to form the outer layer so as to ensure a good weld bond.
In addition to being formed in the desired shape for the aft body of the club head, a thermoplastic inner layer may also be formed with additional features including one or more stiffening ribs to impart strength and/or desirable acoustical properties as well as one or more weight ports to allow placement of additional tungsten (or other metal) weights.
The thickness of the inner layer is typically of from about 0.25 to about 2 mm, preferably of from about 0.5 to about 1.25 mm.
The thickness of the composite laminate structure used to form the outer layer, is typically of from about 0.25 to about 2 mm, preferably of from about 0.5 to about 1.25 mm, even more preferably from 0.5 to 1 mm.
As described in detail in U.S. Pat. No. 6,623,378, filed Jun. 11, 2001, entitled “METHOD FOR MANUFACTURING AND GOLF CLUB HEAD” and incorporated by reference herein in its entirety, the crown or outer shell (or sole) may be made of a composite material, such as, for example, a carbon fiber reinforced epoxy, carbon fiber reinforced polymer, or a polymer. Furthermore, U.S. patent application Ser. No. 12/974,437 (now U.S. Pat. No. 8,608,591) describes golf club heads with lightweight crowns and soles.
Composite materials used to construct the crown and/or sole should exhibit high strength and rigidity over a broad temperature range as well as good wear and abrasion behavior and be resistant to stress cracking. Such properties include,
Composite materials that are useful for making club-head components comprise a fiber portion and a resin portion. In general the resin portion serves as a “matrix” in which the fibers are embedded in a defined manner. In a composite for club-heads, the fiber portion is configured as multiple fibrous layers or plies that are impregnated with the resin component. The fibers in each layer have a respective orientation, which is typically different from one layer to the next and precisely controlled. The usual number of layers for a striking face is substantial, e.g., forty or more. However for a sole or crown, the number of layers can be substantially decreased to, e.g., three or more, four or more, five or more, six or more, examples of which will be provided below. During fabrication of the composite material, the layers (each comprising respectively oriented fibers impregnated in uncured or partially cured resin; each such layer being called a “prepreg” layer) are placed superposedly in a “lay-up” manner. After forming the prepreg lay-up, the resin is cured to a rigid condition. If interested a specific strength may be calculated by dividing the tensile strength by the density of the material. This is also known as the strength-to-weight ratio or strength/weight ratio.
In tests involving certain club-head configurations, composite portions formed of prepreg plies having a relatively low fiber areal weight (FAW) have been found to provide superior attributes in several areas, such as impact resistance, durability, and overall club performance. (FAW is the weight of the fiber portion of a given quantity of prepreg, in units of g/m2.) FAW values below 100 g/m2, and more desirably below 70 g/m2, can be particularly effective. A particularly suitable fibrous material for use in making prepreg plies is carbon fiber, as noted. More than one fibrous material can be used. In other embodiments, however, prepreg plies having FAW values below 70 g/m2 and above 100 g/m2 may be used. Generally, cost is the primary prohibitive factor in prepreg plies having FAW values below 70 g/m2.
In particular embodiments, multiple low-FAW prepreg plies can be stacked and still have a relatively uniform distribution of fiber across the thickness of the stacked plies. In contrast, at comparable resin-content (R/C, in units of percent) levels, stacked plies of prepreg materials having a higher FAW tend to have more significant resin-rich regions, particularly at the interfaces of adjacent plies, than stacked plies of low-FAW materials. Resin-rich regions tend to reduce the efficacy of the fiber reinforcement, particularly since the force resulting from golf-ball impact is generally transverse to the orientation of the fibers of the fiber reinforcement. The prepreg plies used to form the panels desirably comprise carbon fibers impregnated with a suitable resin, such as epoxy. An example carbon fiber is “34-700” carbon fiber (available from Grafil, Sacramento, Calif.), having a tensile modulus of 234 Gpa (34 Msi) and a tensile strength of 4500 Mpa (650 Ksi). Another Grafil fiber that can be used is “TR50S” carbon fiber, which has a tensile modulus of 240 Gpa (35 Msi) and a tensile strength of 4900 Mpa (710 ksi). Suitable epoxy resins are types “301” and “350” (available from Newport Adhesives and Composites, Irvine, Calif.). An exemplary resin content (R/C) is between 33% and 40%, preferably between 35% and 40%, more preferably between 36% and 38%.
Each of the golf club heads discussed throughout this application may include a separate crown, sole, and/or face that may be a composite, such as, for example, a carbon fiber reinforced epoxy, carbon fiber reinforced polymer, or a polymer crown, sole and/or face.
In some embodiments, the CGx, CGy and CGz orientations of the golf club head may be adjustable. For example, in an embodiment, the golf club head is provided with one or more adjustable weight features, such as weight ports, tracks, and/or slots in conjunction with one or more adjustable weights located in the weight port(s), track(s), and/or slot(s). For example, U.S. Pat. No. 9,868,036, which is incorporated herein by reference, describes weight tracks with slidable weights for adjusting the CG orientations of the golf club head. Other adjustable weight features may be used to adjust the CG orientations.
In some embodiments, the CGx, CGy and CGz orientations of the golf club head are positioned in conjunction with the aerodynamic properties of the golf club head. In some implementations, aerodynamic drag forces on the golf club head are reduced by the shape of the striking face. For example, aerodynamic drag forces can be reduced by providing a striking face that is shorter along the positive x-axis 208 projecting toward the heel side of the club head and taller on the negative x-axis 208 is projecting toward the toe side of the golf club head. In other words, the striking face may be provided with bulge oriented in the portion of the face in the negative x-axis. For example, as discussed below, the golf club head may have a crown height to face height ratio of at least 1.12. As a result of this configuration, more material and mass is provided along the negative x-axis of the striking face than along the positive x-axis, which may orient the CGx on the negative x-axis. This aerodynamic shape tends to move CGx toeward naturally.
In addition to the features described above, additional aerodynamic shapes are described in U.S. Pat. Nos. 8,858,359 and 9,861,864. For example, various properties may be modified to improve the aerodynamic aspects of the golf club head. In various embodiments, the volume of the golf club head may be 430 cc to 500 cc. In various embodiments, there may be no inversions, indentations, or concave shaping elements on the crown of the golf club head, and, as such, the crown remains convex over its body, although the curvature of the crown may be variable in various embodiments.
For example, in an embodiment, the golf club head a face height of about 59.1 mm and a crown height of about 69.4 mm. As can be seen, a ratio of the crown height to the face height is 69.4/59.1, or about 1.17. In other embodiments, the golf club head may have a crown height to face height ratio of at least 1.12. Other crown height to face height ratios may be used. For example, a face height of about 58.7 mm may be provided in an embodiment. The corresponding crown height is about 69.4 mm in the current embodiment. A ratio of the crown height to the face height is 69.4/58.7, or about 1.18. Alternatively, a face height of about 58.7 mm may be provided in another embodiment. The crown height is about 69.4 mm in the current embodiment. A ratio of the crown height to the face height is 69.4/58.7, or about 1.18. As such, the ratio of crown height to face height may be between about 1 and about 2, depending on the embodiment.
In another example, the golf club head may have a minimum and/or a maximum face area. For example, the larger the face area, the more drag is produced (i.e., lowers aerodynamic features of the golf club head. In addition to aerodynamic features, the minimum and/or maximum face areas may be dictated by other golf club head properties, such as mass savings and ball speed benefits. Accordingly, in one embodiment, the golf club head has a minimum face area of 3300 mm2. In other embodiments, the golf club head has a face area between about 3700 mm2 and about 4000 mm2. In other embodiments, the golf club head has a face area between about 3500 mm2 and about 4200 mm2. In other embodiments, the golf club head has a face area between about 4100 mm2 and about 4400 mm2, preferably between 4200 mm2 and 4300 mm2. In yet another embodiment, the golf club head has a maximum face area of about 4500 mm2. Other face areas may be used.
In some implementations, discretionary mass is strategically positioned at an angle with respect to the striking face 110, such as in the same plane as the golf club head as the club is designed to travel on the downswing. In some embodiments, the discretionary mass is strategically provided low (along the negative z-axis), rearward (along the positive y-axis 209), and toeward (along the negative x-axis 208), orienting the mass in the location where air is flowing, thereby reducing aerodynamic drag forces and orienting CGx on the negative x-axis.
Examples of strategically positioned discretionary masses are described in U.S. provisional patent application Ser. No. 62/755,319, which is incorporated herein by reference. For example, as illustrated in
In one or more embodiments, golf club head 300 includes a hollow body 310 defining a crown portion 312, a sole portion 314, a skirt portion 316, and a striking surface 318. The striking surface 318 can be integrally formed with the body 310 or attached to the body. The body 310 further includes a hosel 320, which defines a hosel bore 324 adapted to receive a golf club shaft. The body 310 further includes a heel portion 326, a toe portion 328, a front portion 330, and a rear portion 332. Included are a number of features that may improve playability, including at least an inertia generator 360, front channel 390, a slot or channel insert 395, one or more front channel support ribs 396, an additional rib 397 that connects to front channel support ribs 396, as well as composite panels on the sole 344, 348 and on the crown 335, along with discretionary mass elements and other additional features, as will be further described herein. The front channel 390 may have a certain length L (which may be measured as the distance between its toeward end and heelward end), width W (e.g., the measurement from a forward edge to a rearward edge of the front channel 390), and offset distance OS from the front end, or striking surface 318 (e.g., the distance between the face 318 and the forward edge of front channel 390. During development, it was discovered that the COR feature length L and the offset distance OS from the face play an important role in managing the stress which impacts durability, the sound or first mode frequency of the club head, and the COR value of the club head. All of these parameters play an important role in the overall club head performance and user perception.
A front plane 331 that extends from a forwardmost point of the golf club head, and a rear plane 333 that extends from a rearward most point of the golf club head. Each of these planes extends from its respective point and is perpendicular to the ground plane 317. Together, the planes may be used to measure the front to back depth of the golf club head (“club head depth”), as illustrated in
As best illustrated in
As best illustrated in
Example values for the inertia generator's center of gravity 365 are set forth below. In certain embodiments, the inertia generator may have a center of gravity 365 relative to the center 323 of the striking surface 318 as measured on the:
Additionally, due to its shape and orientation, the inertia generator is configured to generally align with a typical swing path, permitting increased inertia generated during a golf swing. Example moments of inertia for golf club head 300 are set forth below.
As best illustrated in
As best illustrated in
Positioned on a rear side of the inertia generator 360 is inertia generator mass element 385, which may comprise a steel or tungsten weight member or other suitable material. Inertia generator mass element 385 may be removably affixed to the rear of the inertia generator 360 using a fastener port 386 that is positioned in the rear of the inertia generator 360 and configured to receive a fastener 388, which may be removably inserted through an aperture 387 in the inertia generator mass element 385 and into the fastener port 386. Fastener port 386 and aperture 387 may be threaded so that fastener 388 can be loosened or tightened either to allow movement of, or to secure in position, inertia generator mass element 385. The fastener may comprise a head with which a tool (not shown) may be used to tighten or loosen the fastener, and a body that may, e.g., be threaded to interact with corresponding threads on the fastener port 386 and aperture 387 to facilitate tightening or loosening the fastener 388.
The fastener port 386 can have any of a number of various configurations to receive and/or retain any of a number of fasteners, which may comprise simple threaded fasteners, such as described herein, or which may comprise removable weights or weight assemblies, such as described in U.S. Pat. Nos. 6,773,360, 7,166,040, 7,452,285, 7,628,707, 7,186,190, 7,591,738, 7,963,861, 7,621,823, 7,448,963, 7,568,985, 7,578,753, 7,717,804, 7,717,805, 7,530,904, 7,540,811, 7,407,447, 7,632,194, 7,846,041, 7,419,441, 7,713,142, 7,744,484, 7,223,180, 7,410,425 and 7,410,426, the entire contents of each of which are incorporated by reference herein.
As illustrated in
Illustrated in
As discussed above, the CGx orientation of the golf club head may be moved toeward (along the negative x-axis) or heelward (along the positive x-axis) to provide to generate specific properties of the golf club head, such as increasing MOI, increasing ball speed and reducing “gear effect.” However, orientating the CGx toeward may result in the striking face of the golf club head remaining open at impact with the golf ball. In this example, when the CGx is oriented along the negative x-axis, it may be more difficult for the user to square (e.g., release) the club head in the downswing, resulting in users hitting the ball right (i.e., a “slice” or “blocked” shot). Conversely, when the orientating the CGx heelward may result in the striking face of the golf club head to be closed at impact with the golf ball. In this example, when the CGx is oriented along the positive x-axis, the club head may release early, making it more difficult for the user to keep the striking face from closing too quickly in the downswing, resulting in the user hitting the ball left (i.e., a “hook” or “pulled” shot). To overcome the missed shots resulting from the negative or positive CGx orientations, visual cues may be provided to offset the CGx orientation (i.e., altering the perceived angle of the face 110 for the user), allowing the user to hit the ball straighter with fewer misses.
As discussed above, in some embodiments, one or more features of the golf club head may be provided to alter the perceived angle of the face for the user. For example, referring back to
For example, the alignment feature may be provided as a contrasting paint or shading of the crown 120 relative to the color or shading of the face 110. In this example, users tend to focus on the perceived top line produced by the contrasting paint, such as via white or another color paint contrasting with the metal striking face, even when the actual face angle is visible to the user. The user tends to ignore the actual face angle when contrasting paint of shading is provided. Further, the alignment feature may also provide for unconscious correction during the swing. Specifically, by perceiving the club to be square when the actual face angle is closed or open relative to the perceived top line, the user will naturally and unconsciously attempt to square the perceived top line at impact with the golf ball, correcting for the misses caused by the CGx orientation.
In some implementations, the alignment feature may alter the perceived top line from about 2 to about 4 degrees open or closed relative to the actual face angle. In some implementations, for each 5 percent change in negative or positive CGx orientation, the perceived top line is 1 degree open or closed, respectively, with respect to the actual face angle (i.e., opening or closing the perceived top line relative to the actual face angle), causing the user to close or open the actual face angle at the address position. Depending on the golf club, each degree of perceived top line change may affect lateral dispersion in a resultant shot by a set amount. For example, changing the perceived top line of a driver by one degree may reduce dispersion by approximately five yards. In another example, changing the perceived top line of a fairway wood by one degree may reduce dispersion by approximately three yards.
In some implementations, the alignment feature may be provided as a parabola defined relative to the striking face. For example, a point on parabola relative to the striking face is provided from about 2 to about 4 degrees open or closed relative to the angle of the striking face. Depending on the golf club, the radius of the alignment feature may affect lateral dispersion in a resultant shot by a set amount. For example, changing the radius of the parabola defining the topline of a driver by one degree may reduce dispersion by approximately five yards. In another example, changing the radius of the parabola defining the topline of a fairway wood by one degree may reduce dispersion by approximately three yards.
In some embodiments, grooves and/or score lines of the golf club head may be provided to alter the address position for the user, aligning the address position with the CG orientations. Referring back to
Further, golf club designs are provided to counteract the left and right tendency that a player encounters when the ball impacts a high, low, heelward and/or toeward position on the club head striking face. One such golf club design incorporates a “twisted” bulge and roll contour, such as discussed in U.S. Pat. Nos. 9,814,944 and 10,265,586 and U.S. Patent Pub. No. 2019/0076705, which are incorporated herein by reference in their entireties.
With the type of “twisted” bulge and roll contour defined above, a ball that is struck in the upper portion of the face will be influenced by horizontal contour D. A typical shot having an impact in the upper portion of a club face will influence the golf ball to land left of the intended target. However, when a ball impacts the “twisted” face contour described above, horizontal contour D provides a general curvature that points to the right to counter the left tendency of a typical upper face shot.
Likewise, a typical shot having an impact location on the lower portion of the club face will land typically land to the right of the intended target. However, when a ball impacts the “twisted” face contour described above, horizontal contour F provides a general curvature that points to the left to counter the right tendency of a typical lower face shot. It is understood that the contours illustrated in
In order to determine whether a 2-D contour, such as A, B, C, D, E, or F, is pointing left, right, up, or down, two measurement points along the contour can be located 18.25 mm from a center location or 36.5 mm from each other. A first imaginary line can be drawn between the two measurement points. Finally, a second imaginary line perpendicular to the first imaginary line can be drawn. The angle between the second imaginary line of a contour relative to a line perpendicular to the center face location provides an indication of how open or closed a contour is relative to a center face contour. Of course, the above method can be implemented in measuring the direction of a localized curvature provided in a CAD software platform in a 3D or 2D model, having a similar outcome. Alternatively, the striking surface of an actual golf club can be laser scanned or profiled to retrieve the 2D or 3D contour before implementing the above measurement method. Examples of laser scanning devices that may be used are the GOM Atos Core 185 or the Faro Edge Scan Arm HD. In the event that the laser scanning or CAD methods are not available or unreliable, the face angle and the loft of a specific point can be measured using a “black gauge” made by Golf Instruments Co. located in Oceanside, CA. An example of the type of gauge that can be used is the M-310 or the digital-manual combination C-510 which provides a block with four pins for centering about a desired measurement point. The horizontal distance between pins is 36.5 mm while the vertical distance between the pins is 12.7 mm.
When an operator is measuring a golf club with a black gauge for loft at a desired measurement point, two vertical pins (out of the four) are used to measure the loft about the desired point that is equidistant between the two vertical pins that locate two vertical points. When measuring a golf club with a black gauge for face angle at a desired measurement point, two horizontal pins (out of the four) are used to measure the face angle about the desired point. The desired point is equidistant between the two horizontal points located by the pins when measuring face angle.
The term “open” is defined as having a face angle generally pointing to the right of an intended target at address, while the term “closed” is defined as having a face angle generally pointing to the left of an intended target ad address. In one embodiment, the lower heel quadrant 520 is more “closed” than all the other quadrants, meaning it has a face angle, in the aggregate, that is pointing more left than any of the other quadrants.
If the edge of the striking surface 500 is not visually clear, the edge of the striking face 500 is defined as a point at which the striking surface radius becomes less than 127 mm. If the radius is not easily computed within a computer modeling program, three points that are 0.1 mm apart can be used as the three points used for determining the striking surface radius. A series of points will define the outer perimeter of the striking face 500. Alternatively, if a radius is not easily obtainable in a computer model, a 127 mm curvature gauge can be used to detect the edge of the face of an actual golf club head. The curvature gauge would be rotated about a center face point to determine the face edge.
In one illustrative example in
The positive x-axis 522 for face point measurements extends from the center face toward the heel side and is tangent to the center face. The positive z-axis 502 for face point measurements extends from the center face toward the crown of the club head and is tangent to the center face. The x-z coordinate system at center face, without a loft component, is utilized to locate the plurality of points P0-P36 and Q0-Q8, as described below. The positive y-axis 504 extends from the face center and is perpendicular to the face center point and away from the internal volume of the club head. The positive y-axis 504 and positive z-axis 502 will be utilized as a reference axis when the face angle and loft angle are measured at another y-z coordinate location, other than center face.
To further the understanding of what is meant by a “twisted face”,
It is understood that many degrees of twist are contemplated and the embodiments described are not limiting. For example, a golf club having a “0.25° twist”, “0.75° twist”, “1.25° twist”, “1.5° twist”, 1.75° twist”, “2.25° twist”, “2.5° twist”, “2.75° twist, “3° twist”, “3.25° twist”, “3.5° twist”, “3.75° twist”, “4.25° twist”, “4.5° twist”, “4.75° twist”, “5° twist”, “5.25° twist”, “5.5° twist”, “5.75° twist”, “6° twist”, “6.25° twist”, “6.5° twist”, “6.75° twist”, “7° twist”, “7.25° twist”, “7.5° twist”, “7.75° twist”, “8° twist”, “8.25° twist”, “8.5° twist”, “8.75° twist”, “9° twist”, “9.25° twist”, “9.5° twist”, “9.75° twist”, and “10° twist” are considered other possible embodiments of the present invention. A golf club having a degree of twist greater than 0°, between 0.25° and 5°, between 0.1° and 5°, between 0° and 5°, between 0° and 10°, or between 0° and 20° are contemplated herein.
Utilizing the grid pattern of
For example, if a head has a bulge radius (Bulge), and roll radius (Roll), it is possible to define two bounding surfaces for the desired twisted face surface by specifying two different twist amounts (DEG). In an embodiment, the striking face has a bulge radius between 228.6 mm and 355.6 mm. In another embodiment, the striking face has a bulge radius between 228.6 mm and 330.2 mm. Additional and different bulge radii may be used.
Table 1 shows the LA° Δ and FA° Δ relative to center face for points located along the vertical axis 700 and horizontal axis 702 (for example points Q1,Q2,Q3, and Q6). With regard to points located away from the vertical axis 700 and horizontal axis 702, the LA° Δ and FA° Δ are measured relative to a corresponding point located on the vertical axis 700 and horizontal axis 702, respectively.
For example, regarding point Q4, located in the upper toe quadrant of the golf club head at a coordinate of (−30 mm, 15 mm), the LA° Δ is measured relative to point Q3 having the same vertical axis 700 coordinate at (0 mm, 15 mm). In other words, both Q3 and Q4 have the same y-coordinate location of 15 mm. Referring to Table 1, the LA° Δ of point Q4 is 0.4° with respect to the loft angle at point Q3. The LA° Δ of point Q4 is measured with respect to point Q3 which is located in a corresponding upper toe horizontal band 704.
In addition, regarding point Q4, located in the upper toe quadrant of the golf club head at a coordinate of (−30 mm, 15 mm), the FA° Δ is measured relative to point Q1 having the same horizontal axis 702 coordinate at (−30 mm, 0 mm). In other words, both Q1 and Q4 have the same x-coordinate location of −30 mm. Referring to Table 1, the FA° Δ of point Q4 is 0.2° with respect to the face angle at point Q1. The FA° Δ of point Q4 is measured with respect to point Q1 which is located in a corresponding upper toe vertical band 706.
To further illustrate how LA° Δ and FA° Δ are calculated for points located within a quadrant that are away from a vertical or horizontal axis, the LA° Δ of point Q8 is measured relative to a loft angle located at point Q6 within a lower heel quadrant horizontal band 708. Likewise, the FA° Δ of point Q8 is measured relative to a face angle located at point Q2 within a lower heel quadrant vertical band 710.
In summary, the LA° Δ and FA° Δ for all points that are located along either a horizontal 702 or vertical axis 700 are measured relative to center face Q0. For points located within a quadrant (such as points Q4, Q5, Q7, and Q8) the LA° Δ is measured with respect to a corresponding point located in a corresponding horizontal band, and the FA° Δ of a given point is measured with respect to a corresponding point located in a corresponding vertical band. In
The reason that points located within a quadrant have a different procedure for measuring LA° Δ and FA° Δ is that this method eliminates any influence of the bulge and roll curvature on the LA° Δ and FA° Δ numbers within a quadrant. Otherwise, if a point located within a quadrant is measured with respect to center face, the LA° Δ and FA° Δ numbers will be dependent on the bulge and roll curvature. Therefore utilizing the horizontal and vertical band method of measuring LA° Δ and FA° Δ within a quadrant eliminates any undue influence of a specific bulge and roll curvature. Thus the LA° Δ and FA° Δ numbers within a quadrant should be applicable across any range of bulge and roll curvatures in any given head. The above described method of measuring LA° Δ and FA° Δ within a quadrant has been applied to all examples herein.
The relative LA° Δ and FA° Δ can be applied to any lofted driver, such as a 9.5°, 10.5°, 120 lofted clubs or other commonly used loft angles such as for drivers, fairway woods, hybrids, irons, or putters.
In some implementations, a “twisted” bulge and roll contour of the striking face of the golf club head may alter the perceived angle of the face for the user. For example, referring back to
In some embodiments, an alignment feature is provided to alter the perceived angle of the face for the user to appear closed with respect to the upper toe quadrant 514 of the striking face. In other embodiments, an alignment feature is provided to alter the perceived angle of the face for the user to appear closed with respect to the actual face angle. In the aforementioned embodiments, the alignment feature counteracts the open appearance of “twisted” bulge and roll contour. In some embodiments, the alignment feature may be provided as a contrasting paint or shading of the crown 120 relative to the color or shading of the face 110. In some embodiments, the contrasting paint or shading extends from the crown 120 onto the face 110. In some implementations, a negative CGx is provided along with a “twisted” bulge and roll contour on the striking face. In some implementations, the negative CGx counteracts some of the alignment issues caused by the “twisted” bulge contour, and vice versa. For example, the “twisted” bulge and roll contour on the striking face may be combined with one or more adjustable weights and/or a discretionary mass strategically positioned at an angle with respect to the striking face. Other combinations of the present embodiments may be provided.
In an embodiment, an alignment feature is provided to alter the perceived angle of the face of a golf club head with a “twisted” bulge and roll contour on the striking face. In this embodiment, the performance of the golf club had can be improved by decreasing lateral dispersion of the golf club head. For example, in the case of a right-handed golfer, lateral dispersion is measured indicating that the golf club has a dispersion tendency for a right miss. The right miss may be the result of the “twisted” bulge and roll contour causing the perceived angle of the face of the golf club head to appear open. The alignment feature may be altered to counteract for the right miss, such as by altering the perceived face angle to appear closed with respect to the closed with respect to the actual face angle. The amount that the alignment feature may be altered may be based on the amount of the lateral dispersion, such as by altering the alignment feature about 1 degree with respect to the intended target line for about every 3-5 yards of lateral dispersion from the intended target line. In the case of a left-handed golfer, if the lateral dispersion is measured indicating that the golf club has a dispersion tendency for a left miss, the alignment feature may be altered to counteract for the left miss by altering the perceived face angle to appear closed with respect to the closed with respect to the actual face angle.
In another embodiment, a different alignment feature is provided to alter the perceived angle of the face of a golf club head with a “twisted” bulge and roll contour on the striking face. In this embodiment, the performance of the golf club had can also be improved by decreasing lateral dispersion of the golf club head. For example, in the case of a right-handed golfer, lateral dispersion is measured indicating that the golf club has a dispersion tendency for a left miss. The left miss may be the result of the “twisted” bulge and roll contour causing the perceived angle of the face of the golf club head to appear closed. The alignment feature may be altered to counteract for the left miss, such as by altering the perceived face angle to appear open with respect to the closed with respect to the actual face angle. The amount that the alignment feature may be altered may be based on the amount of the lateral dispersion, such as by altering the alignment feature about 1 degree with respect to the intended target line for about every 3-5 yards of lateral dispersion from the intended target line. In the case of a left-handed golfer, if the lateral dispersion is measured indicating that the golf club has a dispersion tendency for a right miss, the alignment feature may be altered to counteract for the right miss by altering the perceived face angle to appear closed with respect to the closed with respect to the actual face angle.
In an embodiment, a method 2400 is provided for determining an alignment feature for a golf club head, such as in a head with a negative CGx, a “twisted” bulge and roll, or another design. This method may be performed using one or more of the golf club head embodiments discussed above.
At 2410, a golf club head is provided with an alignment feature. In an embodiment, the golf club head is a new design to be tested prior to large scale manufacturing. In this embodiment, the golf club head may have one or more alignment features. The one or more alignment features may be based on previous designs, such as retained topline properties from a previous design, or may a new alignment feature, such as based on a computer aided design (CAD) model or another club head design. For example, the golf club head may have undergone a complete remodel, such as incorporating a substantial golf club head shape change, or may have been slightly redesigned based on a previous golf club head design. In another embodiment, The golf club head may have only minor differences from another golf club head design, such as a different loft that may result in differences between golf club head designs.
At 2420, the alignment feature is measured. For example, in an embodiment using a top line as an alignment feature, a top line radius is measured. Other alignment features may be measured. Additionally or alternatively, a Sight Adjusted Perceived Face Angle (SAPFA) or other metric of the golf club head may also be measured.
At 2430, the golf club head is tested. For example, a prototype of the new golf club head design are provided for player testing. In this example, one or more players may test the golf club head. Based on the testing, a lateral dispersion of the golf club head may be measured. Other performance metrics may also be measured. Lateral dispersion may be indicative that a different alignment feature may provide better performance, such as less lateral dispersion. In another example, an impression of the alignment feature on the user may also be measured. In this example, if the golf club head face appears too open or too closed during the test, a different alignment feature may improve appeal or confidence in the golf club head to the testers.
At 2440, the alignment feature is adjusted. For example, based on the testing, the one or more alignment features may be adjusted to increase performance and/or appeal of the golf club head. In this example, a top line radius may be adjusted. Based on the lateral dispersion measured during testing, a top line radius may be adjusted one degree for every five yards of lateral dispersion with a driver and adjusted one degree for every three yards of lateral dispersion with a fairway wood. Other adjustment amounts may be provided. Further, additional and different adjustments to the one or more alignment features may be provided.
After the alignment feature is adjusted, one or more of acts 2430 and 2440 may be repeated for additional testing and/or adjustment. In some embodiments, individual player testing may also be performed, such as for individual tour players. At 2450, the adjusted alignment feature is provided for manufacturing. For example, after testing and adjusting one or more alignment features, the golf club head design is manufactured.
Discretionary mass generally refers to the mass of material that can be removed from various structures providing mass that can be distributed elsewhere for tuning one or more mass moments of inertia and/or locating the golf club head center-of-gravity. Golf club head walls provide one source of discretionary mass. In other words, a reduction in wall thickness reduces the wall mass and provides mass that can be distributed elsewhere. Thin walls, particularly a thin crown, provide significant discretionary mass compared to conventional golf club heads.
For example, a golf club head made from an alloy of steel can achieve about 4 grams of discretionary mass for each 0.1 mm reduction in average crown thickness. Similarly, a golf club head made from an alloy of titanium can achieve about 2.5 grams of discretionary mass for each 0.1 mm reduction in average crown thickness. Discretionary mass achieved using a thin crown, e.g., less than about 0.65 mm, can be used to tune one or more mass moments of inertia and/or center-of-gravity location.
To achieve a thin wall on a golf club head body, such as a thin crown, a golf club head body can be formed from an alloy of steel or an alloy of titanium.
Some examples of titanium alloys that can be used to form any of the striking faces and/or club heads described herein can comprise titanium, aluminum, molybdenum, chromium, vanadium, and/or iron. For example, in one representative embodiment the alloy may be an alpha-beta titanium alloy comprising 6.5% to 10% Al by weight, 0.5% to 3.25% Mo by weight, 1.0% to 3.0% Cr by weight, 0.25% to 1.75% V by weight, and/or 0.25% to 1% Fe by weight, with the balance comprising Ti (one example is sometimes referred to as “1300” titanium alloy).
In another representative embodiment, the alloy may comprise 6.75% to 9.75% Al by weight, 0.75% to 3.25% or 2.75% Mo by weight, 1.0% to 3.0% Cr by weight, 0.25% to 1.75% V by weight, and/or 0.25% to 1% Fe by weight, with the balance comprising Ti.
In another representative embodiment, the alloy may comprise 7% to 9% Al by weight, 1.75% to 3.25% Mo by weight, 1.25% to 2.75% Cr by weight, 0.5% to 1.5% V by weight, and/or 0.25% to 0.75% Fe by weight, with the balance comprising Ti.
In another representative embodiment, the alloy may comprise 7.5% to 8.5% Al by weight, 2.0% to 3.0% Mo by weight, 1.5% to 2.5% Cr by weight, 0.75% to 1.25% V by weight, and/or 0.375% to 0.625% Fe by weight, with the balance comprising Ti.
In another representative embodiment, the alloy may comprise 8% Al by weight, 2.5% Mo by weight, 2% Cr by weight, 1% V by weight, and/or 0.5% Fe by weight, with the balance comprising Ti. Such titanium alloys can have the formula Ti-8Al-2.5Mo-2Cr-1V-0.5Fe. As used herein, reference to “Ti-8Al-2.5Mo-2Cr-1V-0.5Fe” refers to a titanium alloy including the referenced elements in any of the proportions given above. Certain embodiments may also comprise trace quantities of K, Mn, and/or Zr, and/or various impurities.
Ti-8Al-2.5Mo-2Cr-1V-0.5Fe can have minimum mechanical properties of 1150 MPa yield strength, 1180 MPa ultimate tensile strength, and 8% elongation. These minimum properties can be significantly superior to other cast titanium alloys, including 6-4 Ti and 9-1-1 Ti, which can have the minimum mechanical properties noted above. In some embodiments, Ti-8Al-2.5Mo-2Cr-1V-0.5Fe can have a tensile strength of from about 1180 MPa to about 1460 MPa, a yield strength of from about 1150 MPa to about 1415 MPa, an elongation of from about 8% to about 12%, a modulus of elasticity of about 110 GPa, a density of about 4.45 g/cm3, and a hardness of about 43 on the Rockwell C scale (43 HRC). In particular embodiments, the Ti-8Al-2.5Mo-2Cr-1V-0.5Fe alloy can have a tensile strength of about 1320 MPa, a yield strength of about 1284 MPa, and an elongation of about 10%.
In some embodiments, striking faces and/or club head bodies can be cast from Ti-8Al-2.5Mo-2Cr-1V-0.5Fe. In some embodiments, striking surfaces and club head bodies can be integrally formed or cast together from Ti-8Al-2.5Mo-2Cr-1V-0.5Fe, depending upon the particular characteristics desired.
The mechanical parameters of Ti-8Al-2.5Mo-2Cr-1V-0.5Fe given above can provide surprisingly superior performance compared to other existing titanium alloys. For example, due to the relatively high tensile strength of Ti-8Al-2.5Mo-2Cr-1V-0.5Fe, cast striking faces comprising this alloy can exhibit less deflection per unit thickness compared to other alloys when striking a golf ball. This can be especially beneficial for metalwood-type clubs configured for striking a ball at high speed, as the higher tensile strength of Ti-8Al-2.5Mo-2Cr-1V-0.5Fe results in less deflection of the striking face, and reduces the tendency of the striking face to flatten with repeated use. This allows the striking face to retain its original bulge, roll, and “twist” dimensions over prolonged use, including by advanced and/or professional golfers who tend to strike the ball at particularly high club velocities.
For further details concerning titanium casting, please refer to U.S. Pat. No. 7,513,296, incorporated herein by reference.
Additionally, the thickness of a club hosel may be varied to provide for additional discretionary mass, as described in U.S. Pat. No. 9,731,176, the entire contents of which are hereby incorporated by reference.
As discussed above, the location and characteristics of golf club head alignment features, such as a golf club head topline, may be important to the golf club's performance and aesthetics. For example, a 1-degree change in perceived face angle of the golf club head may cause a lateral dispersion of up to about 5 yards. Likewise, providing an alignment feature changing the perceived face angle of the golf club head may correct for lateral dispersion caused by other characteristics of the golf club.
One or more of the present embodiments provide for hard tooling the location and characteristics of one or more alignment features into the golf club head. For example, instead of masking and painting a topline onto the golf club head, a topline is hard tooled at the intersection between the casted club head body and a face insert. The club head body, such as a casted club head body, may be painted separately from the face insert, requiring no special masking to provide for an alignment feature. In some embodiments, a transition zone between the face and the crown may be painted the same color as other portions of the casted club head body, eliminating the need to use a masking line between the transition zone and other portions of the casted club head body. After painting the casted club head body, the face may be bonded or otherwise attached to the casting. A contrast in color, difference in finishes, and/or difference in texture between the casted club head body and the face defines the necessary visual cue. For example, the face insert may be a single color, or multicolored. Likewise, the club head body and/or the crown may also be a single color, or multicolored, providing for one or more alignment features by contrasting with the one or more color of the face insert. In another example, the club head body and/or the crown may have one finish, such as gloss, and the face insert may be a different finish, such as matte. In yet another example, the club head body and/or the crown may have one texture, such a visible composite weave, and the face insert may be a different texture, such as a texture that appears uniform or smooth. Additionally or alternatively, a crown insert may be bonded or otherwise attached to the casted club head body to provide for a visual cue. Accordingly, the topline may not be subject to the manufacturing variability resulting from user error and the manufactured golf club heads may be more consistent from part to part.
In some embodiments, the face insert is made of a composite that includes multiple plies or layers of a fibrous material (e.g., graphite, or carbon, fiber) embedded in a cured resin (e.g., epoxy), such as those described in U.S. Pat. No. 10,016,662, the entire contents of which are hereby incorporated by reference. Composite face plates for use in the metalwood golf clubs may be fabricated using the procedures described in U.S. patent application Ser. No. 10/442,348 (now U.S. Pat. No. 7,267,620), Ser. No. 10/831,496 (now U.S. Pat. No. 7,140,974), Ser. Nos. 11/642,310, 11/825,138, 11/998,436, 11/895,195, 11/823,638, 12/004,386, 12,004,387, 11/960,609, 11/960,610, and 12/156,947, which are all incorporated herein by reference in their entirety. The composite material can be manufactured according to the methods described at least in U.S. patent application Ser. No. 11/825,138, the entire contents of which is herein incorporated by reference in its entirety. In some embodiments, the face insert has a variable thickness, such as those described in U.S. Pat. No. 7,874,938, the entire contents of which are hereby incorporated by reference.
In some embodiments, the face is tunable (e.g., for CT, COR, or another characteristic), such as described in U.S. patent application Ser. No. 15/857,407, filed Dec. 28, 2017, the entire contents of which are hereby incorporated by reference.
In some embodiments, the face 110 is provided at least in part as a composite material. Other materials may also be used. The face 110 may be bonded to the golf club head 2500. Any bonding methods known in the art may be utilized, including but not limited to adhesive bonding, including gluing, welding (preferable welding processes are ultrasonic welding, hot element welding, vibration welding, rotary friction welding or high frequency welding (Plastics Handbook, Vol. 3/4, pages 106-107, Carl Hanser Verlag Munich & Vienna 1998)) or calendaring or mechanical fastening including riveting, or threaded interactions. Alternatively, the face 110 may be attached to the golf club head in another manner, such as with screws, fasteners, epoxy, welding, or with another attaching or bonding means. In some embodiments, the face may be welded from the back of the face (i.e., from inside the cavity of a golf club head). The welding may not fully penetrate the face (e.g., less than 100% weld penetration). Past club head designs have provided for an intersection location of the face 110 and golf club body casting at a location that is undesirable for a primary alignment feature 2514. For example, past intersection locations do not provide for aesthetic and visual cue performance due to durability constraints. One or more of the present embodiments provide for a bonded face design allowing for a tooled topline location with aesthetic and performance characteristics while maintaining durability of the golf club head. For example, the tooled topline location may follow the shape of the face insert. If testing the club head shows a lateral dispersion that goes right and/or appears closed, the shape of the face insert may be changed to minimize the lateral dispersion and to make the club head appear more open. Likewise, if testing the club head shows a lateral dispersion that goes left and/or appears open, the shape of the face insert may be changed to minimize the lateral dispersion and to make the club head appear more closed. To maximize performance, the face insert may not be a uniform shape (e.g., not an elliptical face insert). For example, in some embodiments, a portion of the face insert extends upward and heelward toward the hosel. A portion of the face insert may also extend upward and toeward.
In some embodiments, the golf club head includes a secondary alignment feature. Referring back to
The characteristics of the primary alignment feature 2514 may be defined by the face insert 110. For example, a larger face insert 110 may position the alignment feature 2514 higher on the golf club head 2500. Likewise, a smaller face insert 110 may position the alignment feature 2514 lower on the golf club head 2500. The shape of the face insert 110 may also provide for a desired curvature and/or radius of the topline. Once the desired characteristics of the primary alignment feature 2514 are established, the alignment feature 2514 is hard tooled into the golf club head 2500. Hard tooling the alignment feature allows for the alignment feature to be permanent, non-deformable, and not prone to manufacturing errors associated with painted alignment features that use stickers or other maskings during manufacturing. As such, the primary alignment feature is determined by the club head casting and integrated in the golf club head using the face insert.
Additional features of the golf club head 2500 may be facilitated by using a face insert 110. For example, including a notch in the back of the face insert 110 allows for the golf club head 2500 to utilize flight control technology (FCT) in the hosel 150 to include a loft and lie connection sleeve to adjust, inter alia, face angle. Other characteristics of the face insert may provide for performance benefits. In an embodiment, the face insert 110 may provide for more accurate and uniform face thicknesses between manufactured golf club heads and provide for the precise face thickness variabilities incorporated in the golf club head design. In an embodiment, a molded composite face insert allows for variable thickness across locations of the face. In an embodiment, the center of gravity about the x-axis (CGx) may be more accurately positioned using the face insert, such as by using a variable thickness face. Further, characteristic time (CT) and coefficient of restitution (COR) requirements may be attained precisely by molding the composite face and bonding the face to the golf club head. The composite face may also be tunable after installation. In an embodiment, the face insert may provide for a CT above about 255 and a COR of about 835. In an embodiment, different bulge and roll characteristics may be prescribed for a user and provided using the face insert. For example, the different bulge and roll characteristics, including twisted bulge and roll characteristics, may be provided by selecting from different face inserts. One of the different face inserts may be selected prior to bonding the face to the golf club head, or alternatively the face inserts may be interchangeable by a user or club fitter. In yet another embodiment, changing the face characteristics requires the club head casting to change to accommodate the new face insert.
In some embodiments, the face insert may be provided as a dark face insert surface area having a CIELab brightness (L) of less than about 40 and a bright surface area of the casted club head body and/or the crown of the club head has a CIELab brightness of between about 50 and about 100. In some embodiments, the difference in brightness (ΔL) between the face insert and the casted club head body and/or the crown is about 20, about 40, about 50, about 60, about 70, or another difference greater than about 20.
In some embodiments, the face insert may be provided with a dark face insert surface area having a CIELab brightness (L) of less than about 40 and the casted club head body and/or the crown of the club head is provided with a dark surface area having a CIELab brightness of less than about 40. For example, the difference in brightness (ΔL) between the face insert and the casted club head body and/or the crown is about 5, about 10, about 15, about 20, or another difference less than about 20.
In some embodiments, the face insert may be provided as a matte, semigloss, or low gloss face insert surface area having a gloss value of less than about 60, about 50, or about 40 gloss units and a semigloss surface area of the casted club head body and/or the crown of the club head has a CIELab gloss value of greater than about 40, about 50, about 60, and about 70 gloss units. For example, a matte or low gloss face insert may have gloss values of less than 10, 8, 5, 4, or 2 gloss units.
Any difference in appearance between the face insert and the casted club head body and/or the crown may be used as an alignment feature. The club head body and/or the crown may be different in appearance with the face insert by color, brightness, texture, finish, or another visual difference. For example, different finishes may be used, such gloss, semigloss, low gloss, matte, or another finish. Different textures may also be used, such textures manufactured into the club head components, ridges, valleys, patterns of material, composite weaves, and other textures.
At 2810, a primary alignment feature is provided. For example, the primary alignment feature may include a line delineating a transition between a portion of the crown and the face. The portion of the crown may have an area with a shade or color that contrasts the shade or color of the face. The primary alignment feature may be hard tooled into the golf club head using the face of the golf club body. For example, the face may be bonded or otherwise attached to a painted golf club body. The face may be painted or provided with a different shade or color from the crown, or may be unpainted. In an embodiment, the face is provided in a composite material of a shade or color that contrasts with the crown.
At 2820, the lateral dispersion tendency of the golf club head is measured. The lateral dispersion tendency indicates an average dispersion from a center target line. For example, a positive lateral dispersion tendency is the average dispersion right of the center target line and a negative lateral dispersion tendency is the average dispersion left of the center target line. For example, a prototype of the new golf club head design is provided for player testing. In this example, one or more players may test the golf club head. Based on the testing, a lateral dispersion of the golf club head may be measured. Other performance metrics may also be measured. Lateral dispersion may be indicative that a different alignment feature may provide better performance, such as less lateral dispersion. In another example, an impression of the alignment feature on the user may also be measured. In this example, if the golf club head face appears too open or too closed during the test, a different alignment feature may improve appeal or confidence in the golf club head to the testers.
At 2830, the primary alignment feature is adjusted to provide an adjusted primary alignment feature, such as to counteract the lateral dispersion tendency of the golf club head. The primary alignment feature may also be adjusted in conjunction with changing face characteristics of the golf club head, such as when providing for different bulge and roll characteristics, tuning CT, and prescribing other face characteristics. In an embodiment, based on the testing, the primary alignment feature may be adjusted to increase performance and/or appeal of the golf club head. In this example, a top line radius may be adjusted. Based on the lateral dispersion measured during testing, a top line radius may be adjusted one degree for every five yards of lateral dispersion with a driver and adjusted one degree for every three yards of lateral dispersion with a fairway wood. Other adjustment amounts may be provided. Furthermore, additional and different adjustments to the one or more alignment features may be provided.
After the alignment feature is adjusted, one or more of acts 2820 and 2830 may be repeated for additional testing and/or adjustment. In some embodiments, individual player testing may also be performed, such as for individual tour players. In some embodiments, a secondary alignment feature is tested and adjusted.
At 2840, the adjusted primary alignment feature is incorporated into the golf club head. In an embodiment, the adjusted primary alignment feature is incorporated into the golf club head by retooling the golf club head. The adjusted alignment feature may also be provided for manufacturing the golf club heads. For example, after testing and adjusting one or more alignment features, the golf club head design is manufactured. Therefore, as-cast with the golf club head, the one or more alignment features are integrally formed into the golf club head, such as with an integrally formed topline alignment feature.
In some embodiments, when installed to the face insert support structures 2928A, 2928B, the face insert forms a part of the transition region from the face to the crown 120 and/or the sole 130. For example, at least a portion of the transition region may be painted the same color or shade as at least a portion of the crown prior to installing the face insert, which when installed provides a contrasting color or shade of the face insert with respect to the painted portion of the transition region and/or crown. In other embodiments, the face insert eliminates the need for a transition region from the face to the crown 120 and/or the sole 130. In some embodiments, the face insert includes at least a portion of the radius of the transition from the face insert to the crown. By forming part of the radius of the transition from the face to the crown, aerodynamics of the club head may be improved by decreasing turbulence of the air passing from the face to the crown and increasing annular flow.
In some embodiments, the upper face insert support structure 2928A is provided in a shape that flexes in a similar manner as the face insert when the golf club head strikes a golf ball. For example, in some golf club head designs, the face insert material, such as a composite material, is more flexible or compliant than the golf club body material, such as an aluminum or titanium alloy. In this example, a slot or recess 3008A may be provided within the upper peripheral member 3048A to increase flexibility or compliance of the upper face insert support structure 2928A, allowing the face to flex more uniformly. Additional and different shapes may be provided to increase or decrease flexibility and compliance of one or more components of the golf club body. By flexing in a similar manner, the golf club head may be more durable, substantially preventing the face insert from decoupling, or de-bonding, from the golf club body.
In some embodiments, the lower face insert support structure 2928B is provided in a shape that flexes in a similar manner as the face insert when the golf club head strikes a golf ball. In the example discussed above, the face insert material is more flexible or compliant than the golf club body material. In this example, a slot or recess 3008B may be provided within the lower peripheral member 3048B to increase flexibility or compliance of the upper face insert support structure 2928B, allowing the face to flex more uniformly. Additional and different shapes may be provided to increase or decrease flexibility and compliance of one or more components of the golf club body. By flexing in a similar manner, the golf club head may be more durable, substantially preventing the face insert from decoupling, or de-bonding, from the golf club body.
In some embodiments, a high CFY (e.g., greater than about 15 mm, 14 mm, 13 mm, or another CFY) may produce lateral dispersion right of the intended target line. In other embodiments, a low CFY (e.g., less than about 15 mm, 14 mm, 13 mm, or another CFY) may produce lateral dispersion left of the intended target line. In some embodiments, CFY is between about 13 mm and about 15 mm.
In some embodiments, a high face progression (e.g., greater than about 20 mm, 19 mm, 18 mm, or another face progression) may produce lateral dispersion right of the intended target line. In other embodiments, a low face progression (e.g., less than about 19 mm, 18 mm, 17 mm, or another face progression) may produce lateral dispersion left of the intended target line. In some embodiments, face progression is between about 15 mm and about 20 mm.
In some embodiments, a golf club head is provided with at least one of: CFY no more than 15.5 mm; CFY no more than 15 mm; CFY no more than 14.5 mm; CFY no more than 14 mm; CFY no more than 13.5; CFY no more than 13 mm; face progression no more than 20 mm; face progression no more than 19 mm; face progression no more than 18 mm; face progression no more than 17 mm; and face progression no more than 16 mm. In some embodiments, a golf club head is provided with a CFY no more than 17.5 mm.
In other embodiments, one or more alignment features are hard tooled into the golf club head by casting one or more witness lines into the golf club head. For example, one or more positive witness lines may be cast into the hollow body 3210, such as by casting a protrusion, ridge, or other raised feature in the hollow body 3210. In another example, one or more negative witness lines may be cast into the hollow body 3210, such as an indentation, valley, or other depressed feature into the hollow body 3210. In some embodiments, a combination of positive and negative witness lines may be provided. The one or more witness line may be painted with the hollow body 3210 to provide one or more alignment features. Alternatively or additionally, the witness lines may be used as a guide for painting one or more alignment features on the golf club head. By casting the witness lines in the golf club head during manufacturing, the subsequent painting of the one or more alignment features may be more accurate from part to part.
Referring back to
In some embodiments, the golf club head 3200 includes a slot 3295 and a weight track 3245. For example, the slot 3295 and/or the weight track 3245 may be cast into the hollow body 3210. As will be discussed below, the slot 3295 may increase the durability of the golf club head by allowing at least a portion of the hollow body 3210 to flex similarly to the face insert 110, increasing performance of the golf club head and increasing the durability of the golf club head by preventing the face insert 110 from decoupling from the hollow body 3210. In some embodiments, the golf club head 3200 includes one or more characteristic time (CT) tuning ports. Referring to
In some embodiments, the golf club head includes one or more foam inserts. For example, a foam insert 3276 is positioned within the hollow body 3210. An additional foam insert is also provided proximate to the toe portion (not depicted). The one or more foam inserts aid in CT tuning the golf club head by restraining the adhesive or other material to locations within the golf club head while the material solidifies. Additionally, a rear wall may also be provided to further restrain the material while it solidifies. Accordingly, the foam inserts and the rear wall prevent the adhesive injected into the tuning port 3275 from moving too far toeward, heelward, and backward, allowing the golf club head to be CT tuned more precisely. Additional and different structures may be provided to restrain the injected materials during CT tuning.
In some embodiments, the golf club head includes a multi-material inertia generator. An inertia generator, as discussed herein, may also be referred to as an aft winglet and a center of gravity (CG) lowering platform. The inertia generator 3285 moves discretionary mass rearward to increase inertia and to move the CG projection lower on the face of the golf club head. For example, the golf club head 3200 includes an inertia generator 3285 extending rearwardly and angled toewardly from the front portion of the golf club head 3200 to the rear portion of the golf club head 3200. A multi-material inertia generator may include two or more materials of different densities. For example, the inertia generator 3285 includes one or more of a low density portion 3286, a medium density portion 3287, and a high density portion 3288.
The low density portion 3286 may be a composite or another material, such as a portion of the composite sole panel 3230 or as another component. The low density portion 3286 has a density of less than about 2 g/cc, such as between about 1 g/cc and about 2 g/cc. The medium density portion 3287 may be an aluminum alloy, a titanium alloy, another alloy, another material, or a combination of multiple alloys or materials, such as a portion of the hollow body 3210 or as another component. The medium density portion 3287 has a density greater than about 2.7 g/cc, such as between about 1 g/cc and about 5 g/cc, between about 2.0 g/cc and about 5.0 g/cc, and between about 2.5 g/cc and about 4.5 g/cc. The high density portion 3288 may be a steel alloy, a tungsten alloy, another alloy, another material, or a combination of multiple alloys or materials, such as a rear weight affixed to the inertia generator 3285 or as another component. The high density portion 3288 has a density greater than about 7 g/cc. For example, an aluminum alloy is often about 2.7 g/cc, a titanium alloy is often about 4.5 g/cc, a steel alloy is often about 7.8 g/cc, and tungsten alloy a tungsten alloy is often about 19 g/cc.
In some embodiments, the golf club head 3200 includes support ribs 3296, 3297. For example, support ribs 3296 provide for additional support for the hollow body 3210, the weight track 3245 and/or slot 3295. The support ribs 3296 may be provided over the weight track 3245 and in other areas within the hollow body 3210. Support rib 3297 may be provided to support supports the hollow body 3210 and inertia generator 3285. As depicted in
In some embodiments, the golf club head 3200 includes a mass pad 3290 in the heel portion of the golf club head. Mass pad 3290 positions discretionary mass of the golf club head 3200 heelward, and may lower the CG and move CG forward to modify the CG projection onto the face. In some embodiments, a removable and/or adjustable weight may be provided in the heel portion in lieu of or in addition to the mass pad 3290.
The skirt height of golf club 3200 may also improve aerodynamic features of the golf club head. Golf club head 3200 has a skirt height S1, which may measure the lowest point above the ground plane at which the skirt meets the crown. Golf club head 4100 has a skirt height S2. In some embodiments, the skirt height S1 is at least 20 mm, and in some embodiments may be between about 25 mm and about 40 mm, such as between 30 mm and 40 mm, or between 30 mm and 35 mm. Increasing the skirt height S1 of golf club head 3200 likewise improves the aerodynamic properties of the golf club head. The golf club body has a total body height from defined from a bottom most portion of the golf club body, or the ground plane, to a top most portion of the crown, or the peak crown height, such as vertically or along a z-axis. In some embodiments, the total body height is no less than 48 mm, no less than 42 mm, or no less than 53 mm. The golf club body also has a body length defined from a leading edge of the golf club body, or the leading-edge location, to a rearward most portion of golf club head, or the rearward most portion of the skirt, such as horizontally or along a y-axis. In some embodiments, the body length is no less than 98 mm, no less than 93 mm, or no less than 103 mm.
In some embodiments, the face insert 110 can be machined from a composite plaque. In an example, the composite plaque can be substantially rectangular with a length between about 90 mm and about 130 mm or between about 100 mm and about 120 mm, preferably about 110 mm±1.0 mm, and a width between about 50 mm and about 90 mm or between about 6 mm and about 80 mm, preferably about 70 mm±1.0 mm plaque size and dimensions. The face insert 110 is then machined from the plaque to create a desired face profile. For example, the face profile length 4212 can be between about 80 mm and about 120 mm or between about 90 mm and about 110 mm, preferably about 102 mm. The face profile width 4211 can be between about 40 mm and about 65 mm or between about 45 mm and about 60 mm, preferably about 53 mm. The ideal striking location width 4213 can be between about 25 mm and about 50 mm or between about 30 mm and about 40 mm, preferably about 34 mm. The ideal striking location length 4214 can be between about 40 mm and about 70 mm or between about 45 mm and about 65 mm, preferably about 55.5 mm. Alternatively, the face insert 110 can be molded to provide the desired face dimensions and profile.
In embodiments where the face insert 110 is machined from a composite plaque, the face insert 110 can be machined in one or more operations, such as computer numerical control (CNC) or other operations. For example, starting with the composite plaque, a notch 4220 can be first machined from the plaque. Next, a perimeter chamfer can be machined around the perimeter of the face insert 110. Finally, a face profile can be machined from the plaque. In some embodiments, each of the notch 4220, perimeter chamfer, and face profile can be machined in a single operation, such as a single CNC operation without removing the plaque from the CNC fixture. In other embodiments, multiple operations can be performed, such as machining one or more of the notch 4220, perimeter chamfer, or face profile being machined separately from the other features of the face. Other orders of machining features can be provided, such as machining the notch after the face profile and chamfer, as well as machining additional features into the face insert 110, such as bond gap bumps and other features.
Additional features can be machined or molded into face the insert 110 to create the desired face profile. For example, a notch 4220 can be machined or molded into the backside of a heel portion of the face insert 110. For example, the notch 4220 in the back of the face insert 110 allows for the golf club head 2500 to utilize flight control technology (FCT) in the hosel 150. The notch 4220 can be configured to accept at least a portion of the hosel within the face insert 110. Alternatively or additionally, the notch 4220 can be configured to accept at least a portion of the club head body within the face insert 110.
In some embodiments, the notch 4220, or another relief portion, defines a transition region on the face insert. For example, the notch 4220 or relief portion is proximate to a heel portion of the face and can have an area of at least about 50 mm2 and no more than about 300 mm2, preferably less than about 200 mm2, more preferably between about 75 mm2 and about 150 mm2. Preferably, the notch area is about 1.5% to about 6% of the external area of the face insert (e.g., the outward facing portion of the face configured for striking the golf ball), more preferably the notch area is about 2% to about 3% of the external face insert.
The notch may allow for the reduction of CFY by accommodating at least a portion of the hosel and/or at least a portion of the club body within the face insert, allowing the ideal striking location of the face insert to be closer to a plane passing through a center point location of the hosel. The face insert 110 can be configured to provide a CFY no more than about 18 mm and no less than about 9 mm, preferably between about 11.0 mm and about 16.0 mm, and more preferably no more than about 15.5 mm and no less than about 11.5 mm. The face insert 110 can be configured to provide face progression no more than about 21 mm and no less than about 12 mm, preferably no more than about 19.5 mm and no less than about 13 mm and more preferably no more than about 18 mm and no less than about 14.5 mm. In some embodiments, a difference between CFY and face progression is at least 2 mm and no more than 12 mm, preferably between at least 3 mm and 8 mm. In other embodiments, a difference between CFY and face progression is at least 2 mm and no more than 4 mm.
In another example, backside bumps 4230A, 4230B, 4230C, 4230D may be machined or molded into the backside of the face insert. The backside bumps 4230A, 4230B, 4230C, 4230D can be configured to provide for a bond gap. A bond gap is an empty space between the club head body and the face insert that is filled with adhesive during manufacturing. The backside bumps 4230A, 4230B, 4230C, 4230D protrude to separate the face from the club head body when bonding the face insert to the club head body during manufacturing. In some instances, too large or too small of a bond gap may lead to durability issues of the club head, the face insert, or both. Further, too large of a bond gap can allow too much adhesive to be used during manufacturing, adding unwanted additional mass to the club head. The backside bumps 4230A, 4230B, 4230C, 4230D can protrude between about 0.1 mm and 0.5 mm, preferably about 0.25 mm. In some embodiments, the backside bumps are configured to provide for a minimum bond gap, such as a minimum bond gap of about 0.25 mm and a maximum bond gap of about 0.45 mm.
Further, one or more of the edges of the face insert 110 can be machined or molded with a chamfer. In an example, the face insert 110 includes a chamfer substantially around the inside perimeter edge of the face insert, such as a chamfer between about 0.5 mm and about 1.1 mm, preferably 0.8 mm. In some embodiments, the perimeter chamfer is provided to avoid the face insert 110 bottoming out on an internal radius of the recessed face opening of the golf club head configured to receive the face insert 110. By providing the perimeter chamfer, the face insert 110 can fit properly within recessed face opening despite manufacturing variances and other characteristics of the golf club head created during the casting process.
In some embodiments, the face insert 110 is manufactured from multiple layers of composite materials. Exemplary composite materials and methods for making the same are described in U.S. patent application Ser. No. 13/452,370 (published as U.S. Pat. App. Pub. No. 2012/0199282), which is incorporated by reference. In some embodiments, an inner and outer surface of the composite face can include a scrim layer, such as to reinforce the face insert 110 with glass fibers making up a scrim weave. Multiple quasi-isotropic panels (Q's) can also be included, with each Q panel using multiple plies of unidirectional composite panels offset from each other. In an exemplary four-ply Q panel, the unidirectional composite panels are oriented at 90°, −45°, 0°, and 45°, which provide for structural stability in each direction. Clusters of unidirectional strips (C's) can also be included, with each C using multiple unidirectional composite strips. In an exemplary four-strip C, four 27 mm strips are oriented at 0°, 125°, 90°, and 55°. C's can be provided to increase thickness of the face insert 110 in a localized area, such as in the center face at the ideal striking location. Some Q's and C's can have additional or fewer plies (e.g., three-ply rather than four-ply), such as to fine tune the thickness, mass, localized thickness, and provide for other properties of the face insert 110, such as to increase or decrease COR of the face insert 110.
Additional composite materials and methods for making the same are described in U.S. Pat. Nos. 8,163,119 and 10,046,212, which is incorporated by reference. For example, the usual number of layers for a striking plate is substantial, e.g., fifty or more. However, improvements have been made in the art such that the layers may be decreased to between 30 and 50 layers.
The tables below provide examples of possible layups. These layups show possible unidirectional plies unless noted as woven plies. The construction shown is for a quasi-isotropic layup. A single layer ply has a thickness of ranging from about 0.065 mm to about 0.080 mm for a standard FAW of 70 gsm with about 36% to about 40% resin content. The thickness of each individual ply may be altered by adjusting either the FAW or the resin content, and therefore the thickness of the entire layup may be altered by adjusting these parameters.
In addition to the unidirectional composite panels oriented at 90°, −45°, 0°, and 45°, additional Q panels can be provided according to table 1.
indicates data missing or illegible when filed
The Area Weight (AW) is calculated by multiplying the density times the thickness. For the plies shown above made from composite material the density is about 1.5 g/cm3 and for titanium the density is about 4.5 g/cm3.
In an example, a first face insert can have a peak thickness of 4.1 mm and an edge thickness of 3.65 mm, including 12 Q's and 2 C's, resulting in a mass of 24.7 g. In another example, a second face insert can have a peak thickness of 4.25 mm and an edge thickness of 3.8 mm, including 12 Q's and 2 C's, resulting in a mass of 25.6 g. The additional thickness and mass is provided by including additional plies in one or more of the Q's or C's, such as by using two 4-ply Q's instead of two 3-ply Q's. In yet another example, a third face insert can have a peak thickness of 4.5 mm and an edge thickness of 3.9 mm, including 12 Q's and 3 C's, resulting in a mass of 26.2 g. Additional and different combinations of Q's and C's can be provided for a face insert 110 with a mass between about 20 g and about 30 g, or between about 15 g and about 35 g.
In some embodiments, a method of assembling a golf club is provided. For example, the method includes providing a golf club head having a face opening with an internal hosel surface intruding into the face opening (e.g., forming a portion of the face opening). The golf club head can also include at least one of a crown opening and/or a sole opening. The method also includes attaching a composite face insert to the golf club body, where the face insert is machined from a composite plaque with a larger area than the finished face insert. For example, the composite face insert includes a machined perimeter chamfer and a machined in notch. The method further includes enclosing the face opening with the face insert, such as by attaching the face insert to the club head. In some embodiments, the internal hosel surface is received by the notch in the face insert. The method also includes enclosing one or more of the crown opening and/or sole opening with a crown insert and/or a sole insert. The method may further include attaching a golf club shaft having a shaft sleeve, and tightening a screw to attach the golf club shaft to the golf club head to form a golf club assembly. In some examples, the golf club head has a face progression less between 10 and 20 mm and a CFY between 9 and 18 mm, preferably less than 16 mm.
In some embodiments, the x-axis of the golf club head is tangential to the face and parallel to a ground plane, negative locations on the x-axis extend from the center face to the toe portion, and positive locations on the x-axis extend from the center face to the heel portion. In these embodiments, a center of gravity of the golf club body with respect to the x-axis (CGx) can be oriented from about 0 mm to about −10 mm.
In some embodiments, a method of counteracting a lateral dispersion tendency of a golf club head is provided. For example, the golf club head can have a face, a crown and a sole together defining an interior cavity, a body of the golf club head including a heel and a toe portion and having x, y and z axes which are orthogonal to each other and have their origin at USGA center face. The method can include providing a primary alignment feature comprising a line delineating a transition between at least a first portion of the crown having an area of contrasting shade or color with a shade or color of the face. The primary alignment feature can be hard tooled into the golf club head with the face of the golf club body, and the golf club head can have a first Sight Adjusted Perceived Face Angle (SAPFA) with respect to the primary alignment feature. The method also includes measuring the lateral dispersion tendency of the golf club head. The lateral dispersion tendency indicates an average dispersion from a center target line, where a positive lateral dispersion tendency is the average dispersion right of the center target line and a negative lateral dispersion tendency is the average dispersion left of the center target line. The method further includes adjusting the primary alignment feature to provide an adjusted primary alignment feature to counteract the lateral dispersion tendency of the golf club head and incorporating the adjusted primary alignment feature into the golf club head. The adjusted primary alignment feature can have a second Sight Adjusted Perceived Face Angle (SAPFA) of from about −2 to about 10 degrees and a second Radius of Curvature (circle fit) of from about 300 to about 1000 mm.
In some embodiments, the method can also include incorporating the adjusted primary alignment feature into the golf club head comprises retooling the golf club head. In some embodiments, adjusting the primary alignment feature counteracts the lateral dispersion tendency of the golf club head by providing for a positive lateral dispersion tendency for the golf club head. In some embodiments, adjusting the primary alignment feature counteracts the lateral dispersion tendency of the golf club head by providing for a negative lateral dispersion tendency for the golf club head. In some embodiments, adjusting the primary alignment feature counteracts the lateral dispersion tendency of the golf club head by reducing average dispersion from the center target line. In some embodiments, the primary alignment feature is hard tooled into the golf club head by bonding the face to the golf club body. In some embodiments, the golf club body is painted prior to bonding the face to the golf club body. In some embodiments, the adjusted primary alignment feature includes: a second Sight Adjusted Perceived Face Angle 25 mm Heelward (SAPFA25H) of from about −5 to about 2 degrees; a second Sight Adjusted Perceived Face Angle 25 mm Toeward (SAPFA25T) of from 0 to about 9 degrees; and a second Sight Adjusted Perceived Face Angle 50 mm Toeward (SAPFA50T) of from about 2 to about 9 degrees.
In addition to the alignment features described herein, the golf club heads of the present invention may also incorporate additional, such features including but not limited to:
The above-described embodiments are merely possible examples of implementations, merely set forth for a clear understanding of the principles of the present disclosure. Any process descriptions or blocks in flow diagrams should be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process, and alternate implementations are included in which functions may not be included or executed at all, may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present disclosure. Many variations and modifications may be made to the above-described embodiment(s) without departing substantially from the spirit and principles of the present disclosure. Further, the scope of the present disclosure is intended to cover any and all combinations and sub-combinations of all elements, features, and aspects discussed above. All such modifications and variations are intended to be included herein within the scope of the present disclosure, and all possible claims to individual aspects or combinations of elements or steps are intended to be supported by the present disclosure.
This application is a continuation of U.S. patent application Ser. No. 17/547,519, filed Dec. 10, 2021, which is a continuation of U.S. patent application Ser. No. 17/006,561, filed Aug. 28, 2020, now U.S. Pat. No. 11,219,803, which claims the benefit of U.S. Provisional Application No. 62/894,523, filed Aug. 30, 2019, all of which are incorporated by reference herein in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62894523 | Aug 2019 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17547519 | Dec 2021 | US |
| Child | 18136180 | US | |
| Parent | 17006561 | Aug 2020 | US |
| Child | 17547519 | US |
