Abstract
Golf club shaft assemblies with removable counterbalance weights are disclosed herein. In each embodiment, a shaft sleeve is secured within a butt end of a shaft and a weight is removably affixed to the shaft sleeve via locking structures, magnets, and/or spring devices.
Claims
1. An assembly comprising: a shaft comprising a shaft wall, a hollow interior, and a butt end; a shaft sleeve comprising a first head portion with a notch, a first extension portion, and a hollow through-hole; a weight comprising a second head portion, a second extension portion, and a plurality of tines extending radially from the elongated extension portion; and a disc spring, wherein the first extension portion is disposed within the hollow interior and bonded to the shaft wall so that the first head portion abuts the butt end of the shaft, wherein the second extension portion is disposed within the hollow through-hole so that each of the plurality of tines aligns with and fits within the notch, wherein the disc spring is disposed between the first head portion and the second head portion.
2. The assembly of claim 1, wherein the plurality of tines comprises three tines, and wherein each of the three tines is spaced approximately 120° from the other two tines.
3. The assembly of claim 1, wherein the weight can be removed from the shaft sleeve by pulling the head portion of the sleeve apart so that the plurality of tines can be removed from the notch.
4. The assembly of claim 1, wherein the shaft has a diameter ranging from 0.595 to 0.605 inch.
5. The assembly of claim 1, wherein the hollow through-hole has a diameter ranging from 0.510 to 0.517 inch.
6. The assembly of claim 1, wherein the disc spring places pressure on a lower surface of the second head portion.
7. An assembly comprising: a shaft comprising a shaft wall, a hollow interior, and a butt end; a shaft sleeve comprising a first head portion with a notch, a first extension portion with a groove, and a hollow through-hole; a weight comprising a second head portion, a second extension portion with a shelf, and a plurality of tines extending radially from the elongated extension portion; and a spring c-clip; wherein the first extension portion is disposed within the hollow interior and bonded to the shaft wall so that the first head portion abuts the butt end of the shaft, wherein the second extension portion is disposed within the hollow through-hole so that each of the plurality of tines aligns with and fits within the notch, wherein the spring c-clip is disposed within the groove so that it encircles the second extension portion and abuts the shelf.
8. The assembly of claim 7, wherein the plurality of tines comprises three tines, and wherein each of the three tines is spaced approximately 120° from the other two tines.
9. The assembly of claim 7, wherein the weight can be removed from the shaft sleeve by pulling the head portion of the sleeve apart so that the plurality of tines can be removed from the notch.
10. The assembly of claim 7, wherein the shaft has a diameter ranging from 0.595 to 0.605 inch.
11. The assembly of claim 7, wherein the hollow through-hole has a diameter ranging from 0.510 to 0.517 inch.
12. The assembly of claim 7, wherein the spring c-clip places pressure on the shelf.
13. An assembly comprising: a shaft comprising a shaft wall, a hollow interior, and a butt end; a shaft sleeve comprising a first head portion with a notch, a first extension portion with a first shelf and a groove disposed beneath the first shelf, and a hollow through-hole; a weight comprising a second head portion, a second extension portion with a second shelf, and a plurality of tines extending radially from the elongated extension portion; a c-clip; and a disc spring, wherein the first extension portion is disposed within the hollow interior and bonded to the shaft wall so that the first head portion abuts the butt end of the shaft and the first shelf aligns with the second shelf, wherein the second extension portion is disposed within the hollow through-hole so that each of the plurality of tines aligns with and fits within the notch, wherein the c-clip is disposed within the groove so that it encircles the second extension portion, and wherein the disc spring is disposed between the c-clip and the first and second shelves.
14. The assembly of claim 13, wherein the plurality of tines comprises three tines, and wherein each of the three tines is spaced approximately 120° from the other two tines.
15. The assembly of claim 13, wherein the weight can be removed from the shaft sleeve by pulling the head portion of the sleeve apart so that the plurality of tines can be removed from the notch.
16. The assembly of claim 13, wherein the shaft has a diameter ranging from 0.595 to 0.605 inch.
17. The assembly of claim 13, wherein the hollow through-hole has a diameter ranging from 0.510 to 0.517 inch.
18. The assembly of claim 13, wherein the disc spring places pressure on the second shelf
19. The assembly of claim 13, wherein the weight is composed of a high-density material.
20. The assembly of claim 19, wherein the weight comprises tungsten.
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0018] FIG. 1 is a side plan view of a golf club shaft.
[0019] FIG. 2 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a first embodiment of the present invention.
[0020] FIG. 3 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a second embodiment of the present invention.
[0021] FIG. 4 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a third embodiment of the present invention.
[0022] FIG. 5 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a fourth embodiment of the present invention.
[0023] FIG. 6 is a cross-sectional view of the golf club shaft shown in any of FIGS. 2-5 taken along lines 6-6.
[0024] FIG. 7 is a cross-sectional view of the golf club shaft shown in any of FIGS. 2-5 taken along lines 7-7.
[0025] FIG. 8 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a fifth embodiment of the present invention.
[0026] FIG. 9 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a sixth embodiment of the present invention.
[0027] FIG. 10 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a seventh embodiment of the present invention.
[0028] FIG. 11 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to an eighth embodiment of the present invention.
[0029] FIG. 12 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a ninth embodiment of the present invention.
[0030] FIG. 13 is a cross-sectional view of the golf club shaft shown in any of FIGS. 11-12 taken along lines 13-13.
[0031] FIGS. 14A and 14B are side perspective views of the shaft sleeve shown in FIGS. 11-12.
[0032] FIG. 15 is a cross-sectional view of the golf club shaft shown in any of FIGS. 11-12 taken along lines 15-15.
[0033] FIG. 16 is a side view of the embodiment shown in FIG. 15 viewed along lines 16-16.
[0034] FIG. 17 is a cross-sectional view of the golf club shaft shown in FIG. 1 taken along lines A-A according to a tenth embodiment of the present invention.
[0035] FIG. 18 is a cross-sectional view of the embodiment shown in FIG. 17 taken along lines 18-18.
DETAILED DESCRIPTION OF THE INVENTION
[0036] The present invention is directed to golf club shafts with removable counterbalance weights, which are particularly useful when used in connection with putters. The counterbalance weight configurations of the present invention permit golfers to easily and quickly change their club weighting whenever and wherever they wish, including, but not limited to, at the practice range, the golf course, and their home. Each of the embodiments disclosed herein, when fully assembled with a grip 15, appear as shown in FIG. 1.
[0037] A first, preferred embodiment of the present invention is shown in FIGS. 2 and 6-7. In this embodiment, the assembly 10 comprises a shaft 20, a shaft sleeve 30, a weight 40, and a disc spring 50. The shaft 20 has a wall 22 with an overall diameter ranging from 0.595 to 0.605 inch, a hollow interior 24 with a diameter ranging from 0.510 to 0.517 inch, and a butt end 26. The sleeve 30 comprises a head portion 32 comprising a notch 34, an extension portion 36, and a hollow through-hole 38. The weight 40 comprises a head portion 42, an elongated extension portion 44, and a plurality of tines 46a, 46b, 46c extending radially from the elongated extension portion 44, each spaced approximately 120° from its neighbors.
[0038] As shown in FIG. 2, the extension portion 36 of the sleeve 30 is bonded to the shaft wall 22 within the hollow interior 24 at the butt end 26. The weight 40 is removably affixed to the shaft sleeve 30 by inserting the elongated extension portion 44 into the through-hole 38 and flexing the head portion 32 of the sleeve 30 open so that the tines 46a, 46b, 46c can fit within the notch 34. The disc spring 50 is disposed between the head portion 32 of the sleeve and the head portion 42 of the weight 40 and helps to snugly secure the weight 40 to the shaft sleeve 30 by pressing against the underside of the head portion 42. When a user wishes to remove the weight 40, they can pull the head portion 32 of the sleeve 30 open so that the tines 46a, 46b, 46c can be removed from the notch 34.
[0039] The second embodiment, shown in FIGS. 3 and 6-7, has many of the same features as the preferred embodiment, except that instead of a disc spring 50, a spring c-clip 60 is inserted into a lower groove 35 at the bottom end of the extension portion 36 of the sleeve 30. The elongated extension portion 44 of the weight 40 comprises a shelf or lip 45 that rests against the spring c-clip 60 when the weight 40 is fully engaged with the shaft sleeve 30, and the spring c-clip 60 places pressure on the shelf 45 such that, when the head portion 32 of the sleeve 30 is flexed open to remove the tines 46 from the notch 34, the weight is pushed upwards away from the shaft 20.
[0040] The third embodiment, shown in FIGS. 4 and 6-7, has most of the same features as the second embodiment, except that the extension portion 36 of the sleeve 30 has a shelf 37 disposed directly above the lower groove 35, into which a disc spring 50 is placed. Instead of a spring c-clip 60, a regular c-clip 65 is placed into the lower groove, effectively sandwiching the disc spring 50 between the c-clip 65 and the shelf 37. The disc spring 50 places pressure on the shelf 45 of the weight 40 to assist in its removal from the shaft 20 when the head portion 32 of the sleeve 30 is flexed open to remove the tines 46 from the notch 34.
[0041] In a fourth embodiment, shown in FIGS. 5-7, the weight 40 is retained within the sleeve 30 with magnetic parts instead of disc springs 50 or spring c-clips 60. As shown in FIG. 5, the fourth embodiment has many of the same features as the first embodiment, except that the disc spring 50 is replaced with one or more anchoring magnets 70 that are affixed (via adhesive or other means known to a person skilled in the art) to an upper surface 31 of the sleeve 30 head portion 32. The head portion 42 of the weight 40 comprises a lower groove or indent 41 into which one or more securing magnets 80 are affixed, via adhesive or other means known to a person skilled in the art. The magnets 70, 80 are attracted to one another and provide enough force to help secure the weight 40 within the sleeve 30 and shaft 20.
[0042] The fifth through tenth embodiments of the present invention differ from the preceding embodiments in that there is no tine 46/groove 34 structure for retaining the weight 40 within the shaft sleeve 30.
[0043] In the fifth, sixth, and seventh embodiments, the weight 40 is made from a ferrous material. For example, in the fifth embodiment, shown in FIG. 8, the structure is similar to that of the fourth embodiment, except that there is no need for securing magnets 80, as the weight 40 is attracted to the anchoring magnet 70 by virtue of its ferrous properties. The sixth embodiment, shown in FIG. 9, is similar to the fifth embodiment, except that the anchoring magnet 70 is embedded within an upper groove 33 disposed within the upper surface 31 of the sleeve 30 head portion 32. In the seventh embodiment, shown in FIG. 10, the sleeve 30 itself is a magnet, thereby making a separate anchoring magnet 70 unnecessary.
[0044] An eighth embodiment is shown in FIGS. 11 and 13-16. In this embodiment, the shaft sleeve 30 has first and second locking notches 39a, 39b. The first locking notch 39a extends the entire length of the sleeve 30, from the head portion to the end of the extension portion 36, facing the through-hole 38, while the second locking notch is disposed only at the end of the extension portion 36. The weight 40 includes a keyed portion 48 disposed proximate the end of the elongated extension portion 44, the keyed portion 48 sized to fit within and slide through the first locking notch 39a when the elongated extension portion 44 is inserted into the through-hole 38 of the sleeve 30. When the keyed portion 48 exits the through-hole 38, the weight is turned ninety degrees so that the keyed portion 48 fits within the second locking notch 39b, which secures the weight within the sleeve 30 and prevents it from being pulled out without being turned so that the keyed portion 48 can enter the first locking notch 39a again. In this embodiment, pressure may be placed on the head portion 42 of the weight 40 with a disc spring 50 to prevent the weight 40 from rattling, moving, or twisting, as shown in FIG. 11, or the weight 40 made be made of a ferrous material and an anchoring magnet 70 may be affixed to the head portion 32 of the sleeve 30, as described above to further secure the weight 40 within the sleeve. In a ninth embodiment, shown in FIG. 12, an o-ring 90 helps secure the weight 40 instead of a disc ring 50 or magnet 70. The head portion 42 of the weight 40 may include a groove or indent 41 to receive the o-ring 90
[0045] A tenth embodiment of the present invention is shown in FIGS. 17-18. In this embodiment, the sleeve 30 includes a lower groove 35, and the elongated extension portion 44 of the weight 40 includes a plurality of indents or notches 49a, 49b, 49c, each spaced approximately 120° from its neighbors. In an alternative embodiment, there may be two notches 49a, 49b spaced approximately 90° apart, or even just one notch 49a. A detent ball and spring 100a, 100b, 100c is disposed in each notch 49a, 49b, 49c, with the spring portion 101a, 101b, 101c disposed within the notch 49a, 49b, 49c, and the ball portion 102a, 102b, 102c protruding from the notch 49a, 49b, 49c. When the elongated extension portion 44 is inserted into the through-hole 38 of the sleeve 30, the detent ball and springs 100a, 100b, 100c are compressed inwards, allowing the elongated extension portion 44 to slide within the sleeve 30. When the detent ball and springs 100a, 100b, 100c encounter the lower groove 35, they expand such that the ball portions 102a, 102b, 102c slide into the lower groove 35 and prevent the weight 40 from being extracted from the sleeve 30.
[0046] In any of the embodiments disclosed herein, the head portion 42 of the weight may include a socket 43 sized to receive a secondary weight 47 or filler material to allow for further weight adjustability, as shown in FIGS. 8-10. The weight 40 may be composed of a high-density material, including tungsten, and the shaft sleeve 30 may be composed of any material, but preferably a lower-density material such as aluminum alloy or plastic or carbon composite.
[0047] 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. Therefore, the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims.
