Golf Club Head With Heel and Toe Stiffeners

Abstract

A golf club head with plate-like, heel and toe side internal stiffeners is disclosed herein. Each stiffener has a planar portion extending approximately parallel with a portion of the striking face, and is entirely disposed within an interior cavity of the golf club head. The heel side stiffener is connected to top, sole, and heel walls of the club head, with a toe-side edge unconnected to any other portion of the head, and the toe side stiffener is connected to the top, sole, and toe walls of the club head, with a heel-side edge unconnected to any other portion of the head. The toe and heel side edges may have large concavities that distribute mass away from the geometric face center and toward the heel and toe sides of the golf club head.

Claims

1. A golf club head comprising: a body comprising a sole portion, a front wall, a return portion, a hosel, a heel side with a heel side wall, a toe side with a toe side wall, and an interior cavity; wherein the front wall comprises a striking face surface and a geometric face center; a heel side stiffener comprising a first planar front surface, a first planar rear surface, a first upper edge connected to the return portion, a first lower edge connected to the sole portion, a first heel edge connected to the heel side wall, and a first toe edge; a toe side stiffener comprising a second planar front surface, a second planar rear surface, a second upper edge connected to the return portion, a second lower edge connected to the sole portion, a second toe edge connected to the toe side wall, and a second heel edge; wherein each of the heel side stiffener and the toe side stiffener is disposed entirely within the interior cavity; wherein each of the first and second planar front surfaces extends approximately parallel with the striking face surface; wherein the first toe edge is spaced a distance of at least 1 inch measured along a horizontal y-axis from the second heel edge; wherein each of the heel side stiffener and the toe side stiffener has a midsection and has a variable thickness that tapers from the midsection towards at least one of the respective edges of each of the heel side and toe side stiffeners; wherein the first toe edge is spaced a first distance of at least 0.25 inch measured along a horizontal y-axis from the geometric face center; and wherein the second heel edge is spaced a second distance of at least 0.65 inch measured along the horizontal y-axis from the geometric face center.

2. The golf club head of claim 1 wherein the second distance is greater than the first distance.

3. The golf club head of claim 1 wherein the heel side stiffener has an average thickness that is greater than an average thickness of the toe side stiffener.

4. The golf club head of claim 1, wherein the first toe edge is spaced a distance of approximately 1.2 inch from the geometric face center, and wherein the second heel edge is spaced a distance of approximately 1.4 inch from the geometric center.

5. The golf club head of claim 1, wherein each of the heel side stiffener and the toe side stiffener has a maximum thickness of 0.2 inch.

6. The golf club head of claim 1, wherein at least one of the first toe edge and the second heel edge has a concavity.

7. The golf club head of claim 1, wherein each of the first toe edge and the second heel edge has a concavity, such that spacing between the first toe edge and the second heel edge varies.

8. A golf club head comprising: a body comprising a sole portion, a front wall, a return portion, a hosel, a heel side with a heel side wall, a toe side with a toe side wall, and an interior cavity; wherein the front wall comprises a striking face surface and a geometric face center; a planar heel side stiffener comprising a first front surface, a first rear surface, a first upper edge connected to the return portion, a first lower edge connected to the sole portion, a first heel edge connected to the heel side wall, and a first toe edge; a planar toe side stiffener comprising a second front surface, a second rear surface, a second upper edge connected to the return portion, a second lower edge connected to the sole portion, a second toe edge connected to the toe side wall, and a second heel edge; wherein each of the planar heel side stiffener and the planar toe side stiffener is disposed entirely within the interior cavity; wherein each of the first and second front surfaces extends approximately parallel with the striking face surface; wherein the first toe edge is spaced a distance of at least 0.90 inch measured along a horizontal y-axis from the second heel edge; wherein each of the planar heel side stiffener and the planar toe side stiffener has a variable thickness that is no greater than 0.20 inch and that tapers from the midsection towards at least one of the respective edges of each of the planar heel side and planar toe side stiffeners; wherein the first toe edge is spaced a first distance measured along a horizontal y-axis from the geometric face center; wherein the second heel edge is spaced a second distance measured along the horizontal y-axis from the geometric face center; wherein the second heel edge is spaced a second distance measured along the horizontal y-axis from the geometric face center; wherein the second distance is greater than the first distance, and wherein spacing between the first toe edge and the second heel edge is variable.

9. The golf club head of claim 8, wherein the heel side stiffener has an average thickness that is greater than an average thickness of the toe side stiffener.

10. The golf club head of claim 8, wherein the first toe edge is spaced a minimum distance of approximately 1.2 inch from the geometric face center, and wherein the second heel edge is spaced a minimum distance of approximately 1.4 inch from the geometric center.

11. The golf club head of claim 8, wherein the second distance is at least 0.40 inch greater than the first distance.

12. The golf club head of claim 8, wherein the second distance is at least 0.65 inch, and wherein the first distance is at least 0.25 inch.

13. The golf club head of claim 8, wherein the sole portion comprises a weight port.

14. The golf club head of claim 8, wherein at least one of the first toe edge and the second heel edge has a concavity.

15. The golf club head of claim 8, wherein each of the first toe edge and the second heel edge has a concavity.

16. The golf club head of claim 8, wherein the return portion comprises at least one upper rib, and wherein at least one of the first upper edge and the second upper edge is connected to the at least one upper rib.

17. The golf club head of claim 16, wherein the sole portion comprises at least one lower rib, and wherein at least one of the first lower edge and the second lower edge is connected to the at least one lower rib.

18. The golf club head of claim 8, wherein the sole portion comprises at least one lower rib, and wherein at least one of the first lower edge and the second lower edge is connected to the at least one lower rib.

19. The golf club head of claim 18, wherein the return section comprises at least one upper rib, and wherein at least one of the first upper edge and the second upper edge is connected to the at least one upper rib.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0011] FIG. 1 is a top elevational view of a first embodiment of the present invention.

[0012] FIG. 2 is a front elevational of the embodiment shown in FIG. 1 with its crown and face inserts removed.

[0013] FIG. 3 is a cross-sectional view of the embodiment shown in FIG. 1 taken along lines 3-3.

[0014] FIG. 4 is a cross-sectional view of the embodiment shown in FIG. 2 taken along lines 4-4.

[0015] FIG. 5 is side plan view of the embodiment shown in FIG. 5.

[0016] FIG. 6 is a cross-sectional view of the embodiment shown in FIG. 2 taken along lines 6-6.

[0017] FIG. 7 is side plan view of the embodiment shown in FIG. 6.

[0018] FIG. 8 is a front elevational of a second embodiment of the present invention with its crown and face inserts removed.

[0019] FIG. 9 is a cross-sectional view of the embodiment shown in FIG. 8 taken along lines 9-9.

[0020] FIG. 10 is a cross-sectional view of the embodiment shown in FIG. 8 taken along lines 10-10.

[0021] FIG. 11 is a side plan view of the embodiment shown in FIG. 11.

[0022] FIG. 12 is a cross-sectional view of the embodiment shown in FIG. 8 taken along lines 12-12.

[0023] FIG. 13 is a side plan view of the embodiment shown in FIG. 12.

[0024] FIG. 14 is a cross-sectional view of another embodiment with alternative stiffener dimensions.

[0025] FIG. 15 is a cross-sectional view of another embodiment with through-holes in the stiffeners.

DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention is directed to a golf club head, and particular a hybrid golf club head, with stiffeners that extend between crown and sole portions and that are entirely contained within heel and toe regions of the body. The dimensions of the stiffeners, and particularly their heel-to-toe widths, are related to the dimensions of the body of the golf club head, particularly its shaping, volume, heel to toe width, and front to back length. The plate-like stiffeners engage the heel and toe walls, but allow for necessary flex and deflection of the sole and crown hinge region near the center of the face during impact with a golf all, thereby reducing characteristic time while maintaining coefficient of restitution and ball speed. The location of the stiffeners' masses at the heel and toe portions of the club head also benefits the club's moments of inertia, and are mass efficient because they do not need to span the tallest section of the golf club head near the center of the face.

[0027] A first, preferred embodiment is shown in FIGS. 1-7. In this embodiment, the golf club 10 comprises a metal body 20 with a front wall 21, a sole portion 22, a heel side 23 with a heel side wall 23a proximate a hosel 24, a toe side 25 with a toe side wall 25a opposite the heel side 23, a face opening 26, an upper opening 27 encircled by a flange 28 and bounded at the front by a return portion 28a, and a hollow interior 29. A metal face insert 30 is welded to the front wall 21 to close the face opening 26, and a composite crown insert 40 is glued to the flange 28 to close the upper opening 27. When the face insert 30 is affixed to the body 20, it comprises a striking surface 32 that includes a geometric face center 34 and a rear surface 36. The golf club head 10 includes a rear side 12, a crown hinge region 14 and a sole hinge region 16.

[0028] The body 20 also includes a heel-side stiffener 50 and a toe-side stiffener 60. The heel side stiffener 50 has a heel edge 52 that is affixed to the heel side wall 23a, a toe edge 54 that faces the hollow interior 29, a front surface 56 facing the front wall 21 and the face insert 30, and a rear surface 58 facing the rear side 12 of the golf club head 10. The heel-side stiffener 50 also includes an upper edge 51 that is affixed to the return portion 28a and a lower edge 53 that is affixed to the sole portion 22. The toe-side stiffener 60 has a toe edge 62 that is affixed to the toe side wall 25a, a heel edge 64 that faces the hollow interior 29, a front surface 66 facing the front wall 21 and the face insert 30, and a rear surface 68 facing the rear side 12 of the golf club head 10. The toe-side stiffener 60 also includes an upper edge 61 that is affixed to the return portion 28a and a lower edge 63 that is affixed to the sole portion 22.

[0029] When the golf club head 10 is fully assembled, the entire heel edge 64 of the toe-side stiffener 60 is spaced a distance D.sub.1 of at least 0.9 inch from the entire toe edge 54 of the heel-side stiffener 50 as shown in FIG. 14, which illustrates different possible spacing and widths of the stiffeners 50, 60, all measured along the horizontal y-axis. Preferably, the toe edge 54 of the heel-side stiffener 50 is spaced a distance D.sub.2 of at least 0.25 inch from the geometric center 34, and more preferably, the toe edge 54 of the heel side stiffener is spaced approximately 1.2 inch from the geometric face center. The heel edge 64 of the toe-side stiffener 60 preferably is spaced a distance D.sub.3 of at least 0.65 inch from the geometric face center 34, and more preferably approximately 1.44 inches. In some embodiments, distances D.sub.2 and D.sub.3 may be equivalent to one another, but preferably D.sub.2 is greater than D.sub.3.

[0030] Each of the stiffeners 50, 60 has a maximum thickness of no more than 0.20 inch, and have variable thicknesses that taper from their midsections towards the edges of the stiffeners 50, 60. In the preferred embodiment, the heel-side stiffener 50 has an average thickness of 0.045 inch, while the toe-side stiffener 60 has an average thickness of 0.067 inch.

[0031] The preferred embodiment confers performance improvements on the golf club head when compared with an identical golf club head that lacks the novel stiffeners 50, 60. As shown in Table I, the stiffeners 50, 60 increases the MOI along the x and z axes, which are particularly important for spin robustness in hybrid-type golf club heads. The stiffeners also move the center of gravity (cg) closer to the face along the horizontal, face to rear x-axs. As shown in Table II, while the characteristic time drops slightly, the stiffeners 50, 60 maintain the coefficient of restitution (COR) and ball speed compared with a golf club head having no stiffeners 50, 60, and also reduce stress on the golf club head 10.

TABLE-US-00001 TABLE I Impact Frame Mass Properties Impact Frame Mass Properties (No Stiffener) (Vertical Wall Stiffener) Units Cg(x), Cg(y), Cg(z) 0.807 0.01 0.05 0.796 0.005 0.057 in I(xx), I(yy) I(zz) 2291 761 2564 2444 770 2716 g*cm.sup.2 I(xy), I(xz), I(yz) 314 −25 −53 313 −28 −46 g*cm.sup.2

TABLE-US-00002 TABLE I Metric No stiffener Vertical Wall Stiffener Characteristic Time (μs) 242.7 240.9 Coefficient of Restitution 0.878 0.878 Ball Speed (mph) 135.96 135.96 Backspin (rpm) 3724.5 3739.6 Launch Angle (°) 15.56 15.54 Maximum Face IML Stress (ksi) 581.80 571.30 Average Face IML Stress (ksi) 426.37 417.44

[0032] A second embodiment is shown in FIGS. 8-13. The golf club head 10 of this second embodiment includes many of the same features as the first embodiment, except that the toe edge 54 of the heel side stiffener 50 and the heel edge 64 of the toe-side stiffener 60 each include large concavities, so that the spacing between the toe edge 54 of the heel side stiffener 50 and the heel edge 64 of the toe-side stiffener has a variable distance D.sub.4. Similarly, the distances D.sub.5 and D.sub.6 between the geometric face center 34 and these edges 54, 64 are also variable. The concavities allow discretionary mass to be moved to other portions of the golf club head 10 without reducing the beneficial, stiffening effects provided by the stiffeners 50, 60.

[0033] In each of the embodiments, the front and rear surfaces 56, 58, 66, 68 of the stiffeners 50, 60 are planar and preferably extend approximately parallel with the rear surface 36 of the face insert 30. The return section 28a and the sole portion 22 also each have reinforced portions, taking the form of upper and lower ribs 28b, 22a, to which the stiffeners 50, 60 are affixed. Each stiffener 50, 60 is preferably integrally formed with the body 20, but in alternative embodiments one or both of them can be manufactured separately from the body 20 and then affixed within the hollow interior 29 using welding, brazing, or adhesives. Also, in each embodiment, both stiffeners 50, 60 are entirely located within 1 inch of the rear surface 36 of the face insert 30 measured along a front-to-back x-axis, and more preferably are spaced a distance D.sub.7 of no more than 0.85 inch. In any of the embodiments, either or both of the stiffeners 50, 60 may have a through-hole or cutout 100, as shown in FIG. 15.

[0034] From the foregoing it is believed that those skilled in the pertinent art will recognize the meritorious advancement of this invention and will readily understand that while the present invention has been described in association with a preferred embodiment thereof, and other embodiments illustrated in the accompanying drawings, numerous changes, modifications and substitutions of equivalents may be made therein without departing from the spirit and scope of this invention which is intended to be unlimited by the foregoing except as may appear in the following appended claims. The section titles included herein also are not intended to be limiting. Therefore, the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims.