US20080254909A1 - Two-part hosel connection system for golf clubs - Google Patents

Abstract

Disclosed herein is a golf club including a shaft, a club head and several devices for releasably connecting the shaft to the club head.

Description

FIELD OF THE INVENTION
• This invention generally relates to golf clubs, and more specifically to golf clubs having an improved hosel connection that provides interchangeability between a shaft with a club head.
BACKGROUND OF THE INVENTION
• In order to improve their game, golfers often customize their equipment to fit their particular swing. In the absence of a convenient way to make heads and shafts interchangeable, a store or a business offering custom fitting must either have a large number of clubs with specific characteristics, or must change a particular club using a complicated disassembly and reassembly process. It, for example, a golfer wants to try a golf club shaft with different flex characteristics, or use a club head with a different mass, center of gravity, or moment of inertia, in the past it has not been practical to make such changes. Golf equipment manufacturers have been increasing the variety of clubs available to golfers. For example, a particular model of a driver-type golf club may be offered in several different loft angles and lie angles to suit a particular golfer's needs. In addition, golfers can choose shafts, whether metal or graphite, and adjust the length of the shaft to suit their swing. Recently, golf clubs have emerged that allow shaft and club head components, such as adjustable weights, to be interchanged to facilitate this customization process.
• One example is U.S. Pat. No. 3,524,646 to Wheeler for a Golf Club Assembly. The Wheeler patent discloses a putter having a grip and a putter head, both of which are detachable from a shaft. Fastening members, provided on the upper and lower ends of the shaft, have internal threads, which engage the external threads provided on both the lower end of the grip and the upper end of the putter head shank to secure these components to the shaft. The lower portion of the shaft further includes a flange, which contacts the upper end of the putter head shank, when the putter head is coupled to the shaft. This design produces an unaesthetic bulge at the top of the shaft and another unaesthetic bulge at the bottom of the shaft.
• Another example is U.S. Pat. No. 5,433,442 to Walker for Golf Clubs with Quick Release Heads. The Walker patent discloses a golf club in which the club head is secured to the shaft by a coupling rod and a quick release pin. The upper end of the coupling rod has external threads that engage the internal threads formed in the lower portion of the shaft. The lower end of the coupling rod, which is inserted into the hosel of the club head, has diametric apertures that align with diametric apertures in the hosel to receive the quick release pin.
• Another example is U.S. Patent Pub. No. 2006/0105855 A1 to Cackett et al. for a Golf Club with Interchangeable Head-Shaft Connections. The Cackett publication discloses a golf club that uses a sleeve/tube arrangement instead of a traditional hosel to connect the interchangeable shaft to the club head in an effort to reduce material weight and provide for quick installation. A mechanical fastener (screw) entering the club head through the sole plate is used to secure the shaft to the club head.
• Still another example is U.S. Pat. No. 6,547,673 to Roark for an Interchangeable Golf Club Head and Adjustable Handle System. The Roark patent discloses a golf club with a quick release for detaching a club head from a shaft. The quick release is a two-piece connector including a lower connector, which is secured to the hosel of the club head, and an upper connector, which is secured to the lower portion of the shaft. The upper connector has a pin and a ball catch that both protrude radially outward from the lower end of the upper connector. The upper end of the lower connector has a corresponding slot formed therein for receiving the upper connector pin, and a separate hole for receiving the ball catch. When the shaft is coupled to the club head, the lower connector hole retains the ball catch to secure the shaft to the club head.
• Other published patent documents, such as U.S. Pat. No. 7,083,529 and U.S. patent application publication numbers 2006/0287125, 2006/0293115, 2006/0293116 and 2006/0281575, disclose interchangeable shafts and club heads with anti-rotation devices located therebetween.
• There remains a need in the art for golf clubs with an improved connection that provides a method for quickly and easily interchanging the shaft, removable weights and other attachments with the club head.
SUMMARY OF THE INVENTION
• The invention is directed to a releasable connection system for assembling a golf club. The inventive connection system provides an interchangeability between a shaft and a club head that imparts minimal visual impairment and club mass fluctuation while optimizing customization.
• In one embodiment, the present invention includes a connection system that comprises a two-part hosel, wherein a first hosel part is connected to the shaft and a second hosel part is connected to the club head, and an anti-rotation device is disposed between the first and second hosel parts, and the anti-rotation device is located above the club head. The anti-rotation device can have a first serrated surface disposed on the first hosel part and a second corresponding serrated surface disposed on the second hosel part. The first and second serrated surfaces mate to minimize relative rotation between the shaft and the club head.
• In another embodiment, the connection system comprises a hollow sole insert affixed in a hosel bore proximate a sole of the club head, wherein a first key is disposed on an internally threaded distal end of the shaft and a second corresponding key is disposed on the sole insert. As a fastener is inserted through the sole insert and into the threaded distal end of the shaft to connect the shaft to the club head the first and second keys mate with each other to minimize relative rotation between the shaft and the club head.
• In yet another embodiment, the connection system comprises a spring loaded bayonet mount, wherein the spring has a spring constant from about 5 pounds-force to about 100 pounds-force and wherein the spring loaded bayonet mount is located above the club head. The bayonet mount comprises at least one post disposed on the shaft and at least one corresponding channel disposed on a hosel of the club head and the bayonet mount further comprises a spring disposed within the hosel. The channel may have a reduced diameter section sized and dimensioned to releasably retain said post.
BRIEF DESCRIPTION OF THE DRAWINGS
• In the accompanying drawings, which form a part of the specification and are to be read in conjunction therewith and in which like reference numerals are used to indicate like parts in the various views:
• FIG. 1 is an exploded view of an exemplary driver club showing a shaft, a club head and a first embodiment of the inventive connection system;
• FIG. 2 is an exploded view of the two-part hosel of the connection system ofFIG. 1;
• FIG. 3 is a perspective view of the assembled shaft;
• FIG. 4 is a partial cross-sectional view of the connection system ofFIG. 1
• FIG. 5 is a perspective view of the assembled driver club ofFIG. 1;
• FIGS. 6 and 7 are perspective views a second embodiment of the inventive connection system; and
• FIG. 8 is an exploded view of an exemplary driver club and a third embodiment of the inventive connection system;FIG. 8A is an alternative of the third embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
• The present invention is directed to a quick connection system for connecting the shaft to a club head and for changing the shaft or the club head to optimize the golfer's strength to the playing conditions. Such a system can be utilized or customized for various applications, including, but not limited, to the shaft-club head connection, the insertion of adjustable weights in the club head, and the connection of a sole plate to the club head. Several embodiments of the present invention are described below.
• Inventive connection system10 is designed for club fitters to repeatedly change shaft or club head combinations during a fitting session.Inventive connection system10 is designed to give fitting accounts maximum fitting options with a system that is fast and easy to use
• Referring toFIGS. 1 and 2,connection system10 releasably connectsclub head12 toshaft14, such thatdifferent shafts14 can be connected todifferent club heads12.Connection system10 comprises a two-part hosel, i.e., shaftserrated hosel16 and driverserrated hosel18 and internally threadedshaft insert20. Serratedsurface17 ofshaft hosel16 andserrated surface19 ofdriver hosel18 are sized to mate with each other to minimize or prevent relative rotation betweenshaft hosel16 andshaft hosel18. Preferably, each serrated surface comprises a plurality of corresponding teeth.Connection system10 further comprises driversole insert22 andscrew24, which are connected toclub head12 on the sole side, as shown.
• As best shown inFIG. 3,shaft14 is at least partially hollow and is sized and dimensioned to receive and retain internally threadedshaft insert20 therewithin. Preferably,shaft insert20 is securely attached toshaft14 by means of adhesives, epoxies or similar materials. Shaftserrated hosel16 is sized and dimensioned to fit on the outside ofshaft14. Apredetermined length26 ofshaft14 is positioned below shaftserrated hosel16 for insertion intoclub head12. The internal threads ofshaft insert20 are adapted to receive the external threads offastener24, such asscrew24.
• As best shown inFIG. 4, driverserrated hosel18 has external threads, as shown, and is threaded into the top of bore28 ofclub head12. Adhesives or epoxies can also be used to affix driverserrated hosel18 to bore28. At the bottom of bore28, driversole insert22 is inserted into bore28 and affixed therein. Preferably, driversole insert22 is serrated or threaded on the outside surface to increase the surface area to adhesives or epoxies. The assembledshaft14 withshaft insert20 andshaft hosel16 as shown inFIG. 3 is inserted throughdriver hosel18 and intobore18.Screw24 is inserted through driversole insert22 and is threaded intoshaft insert20 to secureshaft14 toclub head12. Preferably,distal tip30 ofshaft14 is spaced apart from the top of driversole insert22 andshaft14 and driversole insert22 is separated bygap32.Gap32 ensures thatscrew24 can fully pullshaft14 downward toward the sole ofclub head12 so thatserrated surfaces17 and19 fully engage each other to minimize relative rotation between the twohosels16 and18 thereby minimizing relative rotation betweenshaft14 andclub head12. In other words,gap32 ensures thatscrew24 does not “bottom out” inside threadedshaft insert20 so thatserrated hosels16 and18 can fully mate with each other.
• Optionally, bore28 hasledge34 shown inFIG. 4 formed integrally thereon, e.g., through the casting process, to abut driver sole insert22 to provide additional structural support for driversole insert22 andscrew24. Alternatively, driver sole insert22 can be formed integrally on bore28. These alternatives are applicable to all of the embodiments described herein.
• Referring toFIG. 5, a fully assembled golf club is shown.Serrated hosels16 and18 form a single hosel and theserrated lines16 and17 separating the two hosels are preferably located above the top ofclub head12. The advantage of locating the anti-rotation device, i.e., shaftserrated hosel16 and driverserrated hosel18, above the club head is that no additional mass is added, thereby preserving the mass properties of the club head and eliminating a protrusion at the shaft/hosel intersection. The anti-rotation device uses a standard hosel to make both the shaft serrated hosel and the driver serrated hosel This means there is no weight gained or lost from the device, which in turn means no change in moment of inertia or center of gravity. Furthermore,serrated lines16 and17 add a visual distinction to the golf club and readily identify the golf club as an interchangeable golf club.
• Driver sole insert22 and shaft threadedinsert20 can be made out of aluminum, stainless steel or titanium.Screw24 can be any threaded screw, and is preferably a TORX™ drive flat head screw and thesole insert22 is tapered so that the head ofscrew24 can be flushed withsole insert22, as best shown inFIG. 4.
• Referring toFIGS. 6 and 7, another embodiment ofconnection system10 is shown. In this embodiment, the two-part hosel of the first embodiment is replaced by a keyed anti-rotation device. This keyed anti-rotation device comprises angled cut-out36 on the distal tip ofshaft14.Shaft14 is also hollow and has threadedshaft insert20 inserted therein andconventional hosel40 disposed thereon. Driver sole insert22′ has angledsurface38 sized and dimensioned to match cut-out36. In this embodiment,shaft14 is inserted into driver sole insert22′, and angled cut-out36 is keyed to angledsurface38 asscrew24 is threaded intoshaft insert20 to minimize or prevent relative rotation betweenshaft14 and driver sole insert22′/club head12. An advantage of this embodiment is that an anti-rotation device can be added without adding substantial weight to the club head thereby minimizing the effect on the club's swing weight.
• Referring toFIG. 8, another embodiment ofconnection system10 is shown. In this embodiment, bore18 does not extend throughclub head12.Club head12 hashosel42, which has at least one and preferably two ormore channels44.Channel44 hasentry leg46 and lockingleg48.Leg46 is adapted to receivepost50 onshaft14. Afterpost50 travels throughentry leg46, it passestransverse leg47 before being received and held in lockingleg48. Disposed withinhosel42 isspring52 which exerts an upward force onshaft14 to hold securely post50 in lockingleg48.Spring52 is selected so that it can exert a sufficient force to holdpost50 withinchannel44. Preferably,spring52 has a spring constant from about 5 to about 100 pounds-force/inch. More preferably, the spring constant can be in the range of about 20 to about 75 pounds-force/inch and most preferably about 33 pounds-force/inch. A golfer can conveniently insertshaft14 intohosel42 after aligningpost50 toleg46. Thereafter,shaft14 is rotated alongtransverse leg47 and afterward spring52 pushesshaft14 upleg48.Post50 andchannel44 is also known as a bayonet mount or connection.
• Althoughchannel44 is illustrated as a “J-shaped” channel, it can have any shape, e.g., “U”, “L”, “S”, “V” or “W” shape. Also, preferablyleg46 is preferably deep so that aspost50 is moved down intohosel42, more ofshaft14 overlaps hosel42 to increase mechanical stability. Alternatively, the top of lockingleg48 may have a reduced diameter section to holdpost50 by press-fit or by increased friction. As illustrated inFIG. 8A, the reduced diameter section can be a triangular section. The reduced diameter section can also be a figure-eight or waist section.
• While the embodiments of the present invention are illustrated with driver-type clubs, it is understood that any type of golf clubs can utilizeinventive connection system10.
• While it is apparent that the illustrative embodiments of the invention disclosed herein fulfill the objectives stated above, it is appreciated that numerous modifications and other embodiments may be devised by those skilled in the art. Therefore, it will be understood that the appended claims are intended to cover all such modifications and embodiments, which would come within the spirit and scope of the present invention.

Claims (20)

1. A golf club comprising a shaft, a club head and a connection system releasably connecting the shaft to the club head, said connection system comprises a two-part hosel, wherein a first hosel part is connected to the shaft and a second hosel part is connected to the club head wherein an anti-rotation device is disposed between the first and second hosel parts, and wherein said anti-rotation device is located above the club head.

2. The golf club ofclaim 1, wherein the anti-rotation device comprises a first serrated surface disposed on the first hosel part and a second corresponding serrated surface disposed on the second hosel part and wherein the first and second serrated surfaces mate to minimize relative rotation between the shaft and the club head.

3. The golf club ofclaim 1, wherein the connection system further comprises a hollow sole insert fixedly attached to a bore in the club head and a fastener adapted to pass through the sole insert and into a threaded distal end of the shaft to affix the club head to the shaft.

4. The golf club ofclaim 3, wherein the distal end of the shaft is spaced apart from the sole insert.

5. The golf club ofclaim 3, wherein the sole insert is made integral to the bore.

6. The golf club ofclaim 3, wherein the bore comprises a ledge that the sole insert abuts when the fastener is affixed to the distal end of the shaft.

7. The golf club ofclaim 3, wherein the threaded distal end of the shaft comprises a hollow distal end adapted to receive a threaded shaft insert.

8. The golf club ofclaim 3, wherein the fastener comprises a threaded screw.

9. The golf club ofclaim 2, wherein each serrated surface comprises a plurality of teeth.

10. A golf club comprising a shaft, a club head and a connection system, said connection system compriseing a hollow sole insert affixed in a hosel bore proximate a sole of the club head, wherein a first key is disposed on an internally threaded distal end of the shaft and a second corresponding key is disposed on the sole insert and wherein as a fastener is inserted through the sole insert and into the threaded distal end of the shaft to connect the shaft to the club head the first and second keys mate with each other to minimize relative rotation between the shaft and the club head.

11. The golf club ofclaim 10, wherein the first and second keys comprise corresponding surfaces.

12. The golf club ofclaim 10, wherein the sole insert and hosel bore are integral to each other.

13. A golf club comprising a shaft, a club head and a connection system, said connection system comprises a spring loaded bayonet mount, wherein the spring has a spring constant, k, from about 5 pounds-force to about 100 pounds-force and wherein the spring loaded bayonet mount is located above the club head.

14. The golf club ofclaim 13, wherein the bayonet mount comprises at least one post disposed on the shaft and at least one corresponding channel disposed on a hosel of the club head and the bayonet mount further comprises a spring disposed within the hosel.

15. The golf club ofclaim 13, wherein the spring constant is from about 20 pounds-force to about 75 pounds-force.

16. The golf club ofclaim 15, wherein the spring constant is about 33 pounds-force.

17. The golf club ofclaim 14, wherein said channel comprises a reduced diameter section sized and dimensioned to releasably retain said post.

18. The golf club ofclaim 17, wherein said reduced diameter section comprises a triangular section.

19. The golf club ofclaim 17, wherein said reduced diameter section comprises a waist section.

20. A golf club comprising a shaft, a club head and a means for releasably connecting the shaft to the club head.

Images