1. Field of the Invention
The invention relates generally to golf clubs having detachable heads and shafts. More particularly, the invention pertains to a golf club and a related kit in which various selected club heads and shafts may be interchanged and adapted to suit the needs of the user.
2. Description of the Prior Art
Golf clubs having removable shafts are well represented in the prior art. For example, in U.S. Pat. No. 5,388,827, granted to Reynolds, Jr., three embodiments of a golf putter with a removable shaft are disclosed. A keyway engaged by various shaft locking means, prevents the shaft from rotating. A screw or a double threaded allen bolt threadably engages the lower end of the shaft, and secures it within a bore in the club head.
In U.S. Pat. No. 6,890,269, issued to Burrows, a temporary golf club shaft-component connection is illustrated. A compression nut, an adapter insert with a lower pin, an adapter socket, and an anchor member are used to secure the lower tip of a shaft within the hosel of a club head. Splines are provided on the adapter insert and spline grooves are provided within the adapter socket.
A golf club having an aligning and quick connect-disconnect coupling between the golf club shaft and the club head is shown in U.S. Pat. No. 5,039,098, to Pelz. This arrangement uses an angular alignment surface on the lower end of the shaft which cooperates with an angular alignment stop formed within the heel of the golf club head. A bore, provided within the end of the shaft, is engaged by a machine screw to secure the shaft within the hosel of the club.
The present invention comprises a golf club kit having selectively interchangeable heads and shafts. In this manner, the golfer may experiment with different combinations of golf club heads and shafts, to obtain the optimum golf club construction for the needs of that golfer. In addition, the golf club construction allows the selected shaft to be quickly and easily re-positioned into a plurality of rotational positions with respect to the selected club head, again to optimize the performance of the golf club for the golfer.
The upper face of a club head includes a shaft hosel, provided with a recessed sleeve therein. The recessed sleeve includes sidewalls, an open top, and an open bottom. A receiver, having a bore provided with a plurality of spline grooves, is secured within the sleeve. The receiver fits snugly within the sleeve and may be epoxy glued or welded to resist rotation or accidental removal. A recessed, elongated screw port is provided in the lower face of the club head. The screw port is axially aligned with the open bottom in the floor of the sleeve and the bore in the receiver.
The club shaft includes a conventional hand grip on its upper end and a hosel connector on its lower end. The hosel connector has a lower portion provided with a plurality of external splines. The lower portion is also provided with a threaded bore having an open end. The upper portion of the hosel includes a circumferential flange, having an downwardly and outwardly flaring, arcuate sidewall.
The hosel connector of a selected shaft is inserted into the receiver of a selected club head in a selected rotational position. The threaded end of a headed screw is passed upwardly through a passageway in the upper end wall of the screw port. The screw end is threadably installed within the bore of the hosel connector. The head of the screw tightens against the end wall, and the hosel connector flange is compressed securely against the upper end of the receiver.
Making particular reference to
Club head 12 includes an upper face 17 and a lower face 18. Upper face 17 is provided with a hosel 19 including a recessed sleeve 21. Sleeve 21 is preferably right-circular cylindrical in configuration, and includes an open top 22 and an open bottom 23. A hosel receiver 24, is provided with a bore 26 having a plurality of spline grooves. Receiver 24 also includes a peripheral flange 27 around its upper end, including an outer side with an arcuate surface. Receiver 24 may be secured within sleeve 21 through the use of epoxy glue. Alternatively, peripheral flange 27 may be welded to an adjacent surface of the club head 12.
A recessed screw port 28 is provided in the lower surface 18 of the club 12. Port 28 is elongated, including a right-circular cylindrical side wall 29, a side brace 30, and a transverse upper end 31. A passageway 32 is provided within upper end 32, to pass a screw 33. Preferably, left-handed threads 34 are provided on the end of screw 33, to discourage any tendency for the screw to loosen during use of the club 11. The screw 33 also includes a head 36 provided with a star-shaped driver recess 37. As shown most clearly in
Club shaft 13 includes a hosel connector 39 secured over its lower end. The hosel connector 39 has a lower portion provided with a plurality of external splines 41, oriented so they are generally parallel to axis 38. An internally threaded open bore 42, axially coincident with axis 38, is also proved within the lower portion. An upper portion of connector 39 is provided with a circumferential flange 43. Shaft 13 is preferably constructed from carbon fiber material, although tubular metals and other material may be suitable and, in fact, desired by certain golfers. A conventional grip 44 is provided on the upper end of shaft 13, for convenient and comfortable gripping by the golfer.
In use, the golfer selects a particular shaft 13 and a particular club head 12. This selection process may be pre-determined in the sense that the golfer knows the precise combination of shaft and club head necessary to assemble the desired golf club 11. Or, the process may initially be indeterminate, where the golfer likes a particular shaft 13, but does not know which club head 12 is optimum for his or her swing and use. It may also be the case that the golfer likes a particular club head 12, but desires to experiment with different shafts 13. The golf club 12 of the present invention allows the user to assemble a particular pre-determined combination of a shaft and a club head, or to experiment with different shaft and club head combinations. In the latter circumstance, the golf club 11 may also be viewed as a kit, comprised of a single shaft with multiple club heads, a single club head with multiple shafts, or multiple shafts with multiple club heads.
Once the selection has been made, the hosel connector 39 of a selected shaft 13 is inserted into the hosel receiver 24 of a selected club head 12. To secure the shaft 13 within the club head 12, a screw installation and removal tool 46 is utilized. Tool 46 is of conventional design, and includes features which are handy for the present application. Tool 46 includes a handle 47, a rachet direction control 48, and a bit coupler 49. A bit 51, including a male star element 52 corresponding in configuration to driver recess 37, is secured to coupler 49. Tool 46 is used to pass screw 33 upwardly through screw port 28 and passageway 32. Owing to the existing axial alignment of structural elements, continued urging of the screw upwardly will effect a mate of the end of the screw 33 and the bore 42 in connector 39.
Rotation of the handle of tool 46 will threadably install the screw 33 within the bore 42 and draw shaft 13 and club head 12 together. In addition, as screw 33 is further tightened, circumferential flange 43 and peripheral flange 27 are compressed together in tight relation. The outer side of the flanges 43 and 27 have generally matching arcuate configurations, providing a smooth and pleasing visual transition between the two structures.
It should also be noted that shaft 13 may be installed within club head 12 in a plurality of rotational positions owing to the spline and spline groove compatibility for multiple coupling positions. This is a desirable feature for at least several reasons. First, some grips 44 may have flats or other surface contours which make the shaft better for gripping with a certain rotational orientation between the shaft and the club head. In addition, certain shafts have better performance, particularly for driving activities, when they are oriented in a particular rotational position with respect to the swinging and impact forces. It is believed that this characteristic may be attributable to manufacturing techniques used in making the shafts. In any event, the rotationally adjustable feature for the shaft 13 of the golf club 11 of the present invention, allows appropriate adjustments to be made as needed.
A second embodiment of the golf club 11, simply involves the use of a club head having a structurally different design to be used for a different purpose other than for driving. To that end, a putter or iron club head 53, is shown in
Pursuant to the provisions of 35 U.S.C. § 119(e)(1), Applicant claims the priority of U.S. Provisional Patent Application Ser. No. 60/597,292, filed Nov. 21, 2005.
Number | Date | Country | |
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60597292 | Nov 2005 | US |
Number | Date | Country | |
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Parent | 11595146 | Nov 2006 | US |
Child | 12229824 | US |