Adjustable golf club shaft and hosel assembly

Abstract

An adjustable shaft and hosel assembly allows for dependent and independent adjustment of a golf club's face angle, loft angle, and lie angle. The adjustable shaft and hosel assembly comprises a shaft sleeve with a joint portion, a hosel portion, and a fitting piece, wherein the joint portion fits within the fitting piece and the fitting piece fits within the hosel portion.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not Applicable

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a golf club head having an adjustable shaft and hosel assembly. More specifically, the present invention relates to a golf club shaft and hosel connection assembly that allows a user to adjust the loft, lie, and face angle of the golf club head, either dependently or independently without requiring the user to remove the shaft from the hosel completely.

2. Description of the Related Art

It is known that changing the angle of a golf club shaft with respect to the golf club head will change certain club specifications, including loft angle, lie angle, and face angle. Several types of adjustable golf clubs are currently available on the market. These models allow the user to adjust loft, lie and face angle by adjusting certain golf club components, which themselves rotate the shaft in a cone-shaped path about a reference axis.

Current adjustable golf club models include rotatable component features that are used for angle indexing and for transmitting torque forces between the club body and shaft, and vice-versa. These component features limit the number of shaft angle adjustments, however. The maximum angular range of these designs has been found to be approximately ±2.0° from the reference axis. None of the currently available adjustable golf clubs permit a 0° angle adjustment with respect to the reference axis.

The adjustable golf club models currently on the market have other drawbacks in addition to limited shaft angle adjustability. Because the shaft is fixed to the standard rotating features of these golf clubs, which operate on a fixed cone range of movement, the shaft graphics and grip reminder rotate out of orientation with the club head body when angles are adjusted. This can frustrate golfers who rely on grip reminders or asymmetric grips while using their clubs.

Furthermore, in many cases a user has to remove certain shaft components to make angle adjustments, thus increasing the difficulty of making adjustments as well as increasing the likelihood that the user will lose important pieces of the adjustable golf club head. For example, with current designs, shaft interchangeability is achieved by removing mechanical fastener(s) that attach the shaft component to the club head body. A different shafted component can then be added and the mechanical fastener(s) can be re-used to attach the shaft component to the club head body. Golfers run the risk of losing the mechanical fastener(s) when they make desired adjustments.

BRIEF SUMMARY OF THE INVENTION

The present invention relates to wood golf club heads that have angular adjustable shaft and hosel assemblies.

One aspect of the present invention is an adjustable golf club head comprising a face, a sole, a crown, a shaft sleeve having a shaft sleeve axis and a shaft-receiving bore, the shaft-receiving bore having a bore axis that is coaxial with the shaft sleeve axis, a hosel having a hosel bore extending from the sole to the crown, at least part of the hosel bore having a diameter sized to receive at least a part of the shaft sleeve, and a first tubular adjustment piece having non-parallel upper and lower surfaces, wherein the first tubular adjustment piece fits around a section of the shaft sleeve when at least a part of the shaft sleeve is inserted within the hosel bore, wherein rotating the first tubular adjustment piece around the shaft sleeve changes the angle of the shaft sleeve with respect to the face, wherein the first tubular adjustment piece provides a plurality of angular adjustments, and wherein the shaft sleeve does not rotate around the bore axis more than 5 degrees for any of the plurality of angular adjustments. This adjustable golf club head may further comprise a flange within the hosel bore, wherein the flange comprises a convex lower surface and a fastener comprising a fastener head and a threaded body, wherein the fastener is inserted into the hosel bore through the sole, wherein the threaded body engages the shaft sleeve to connect the shaft sleeve to the head, and wherein the fastener head abuts the convex lower surface of the flange when the threaded body is fully engaged with the shaft sleeve.

In a further embodiment, the adjustable golf club head comprises a washer disposed between the fastener head and the convex lower surface of the flange, wherein the washer comprises a concave surface that mates with the convex lower surface of the flange. In an alternative embodiment, the fastener head comprises a concave surface that mates with the convex lower surface of the flange. In a further embodiment, a radius of the convex lower surface is equivalent to a distance between a rotation point of the shaft sleeve and a point at which the fastener head makes contact with the flange. In another embodiment, a radius of the convex lower surface is 0.1 to 3.0 inches. In yet another embodiment, the shaft sleeve further comprises a universal joint connection having a joint bore sized to securely receive the threaded body of the fastener, and the universal joint connection may protrude from a lower portion of the shaft sleeve and comprise at least two planar sides and at least two curved sides. In a further embodiment, the golf club head may comprise a fitting member sized to fit within the hosel bore proximate the crown, the fitting member comprising a fitting member bore sized to receive the universal joint connection. The fitting member may be able move within the hosel bore along a first axis, and the universal joint connection may be able move within the fitting member bore along a second axis. In a further embodiment, the first axis is perpendicular to the second axis. The shaft sleeve of these embodiments may have a 360 degree range of angular movement around a rotation point when the fitting member and the universal joint connection are fully assembled with the hosel

In another embodiment, the adjustable golf club head may further comprise a second tubular adjustment piece having non-parallel upper and lower surfaces, wherein the second tubular adjustment piece is disposed proximate the first tubular adjustment piece. In this embodiment, the first and second tubular adjustment pieces may each comprise one or more markings on an external surface, and wherein the one or more markings indicate angular adjustments provided by said adjustment pieces. The adjustable golf club head may be any type of club head, such as a wood-type golf club head, or more specifically a driver golf club head.

Another aspect of the present invention is an adjustable driver head comprising a face, a sole, a crown, a shaft sleeve comprising a shaft sleeve axis, a shaft-receiving bore having a bore axis that is coaxial with the shaft sleeve axis, and a universal joint connection protruding from a lower portion of the shaft sleeve, wherein the universal joint connection comprises at least two flat sides and at least two curved sides, and wherein the universal joint connection further comprises a threaded joint bore, a fitting member comprising a fitting member bore and an external surface, wherein each of the fitting member bore and the external surface have at least two flat sides and at least two curved sides, and wherein the fitting member bore is sized to receive the universal joint connection, a hosel comprising a hosel bore extending from the sole to the crown, wherein a region of the hosel bore proximate the crown comprises at least two flat sides and at least two curved sides and wherein the region of the hosel bore proximate the crown is sized to receive the fitting member, first and second tubular adjustment pieces, each comprising non-parallel upper and lower surfaces, wherein the first tubular adjustment piece fits around the shaft sleeve when the universal joint connection is assembled with the fitting member and the hosel bore, and a fastener comprising a head and a threaded body, wherein the threaded body engages the threaded joint bore, wherein rotating the first and second tubular adjustment piece around the shaft sleeve changes the angle of the shaft sleeve with respect to the face, and wherein the shaft sleeve does not rotate around the bore axis more than 5 degrees.

In a further embodiment, the driver head may further comprise a flange disposed within the hosel bore, wherein the fastener head abuts the convex lower surface of the flange when the threaded body is fully engaged with the threaded joint bore, and wherein the flange comprises a convex lower surface having a radius that is equivalent to a distance between a rotation point of the shaft sleeve and a point at which the fastener head makes contact with the flange. The radius of the lower convex surface may be between 0.1 and 3 inches.

Yet another aspect of the present invention is an adjustable driver head comprising a face, a sole, a crown, a shaft sleeve comprising a shaft sleeve axis and a shaft-receiving bore, the shaft-receiving bore having a bore axis that is coaxial with the shaft sleeve axis, a hosel having a hosel bore extending from the sole to the crown, the hosel bore sized to receive at least a part of the shaft sleeve, a first tubular adjustment piece disposed around the shaft sleeve and providing a plurality of angular adjustments for the shaft sleeve, a flange within the hosel bore, wherein the flange comprises a convex lower surface, and a fastener comprising a fastener head and a threaded body, wherein the fastener is inserted into the hosel bore through the sole, wherein the threaded body engages the shaft sleeve to connect the shaft sleeve to the head, wherein the fastener head abuts the convex lower surface of the flange when the threaded body is fully engaged with the shaft sleeve, and wherein the shaft sleeve does not rotate around the bore axis more than 5 degrees for any of the plurality of angular adjustments.

Another aspect of the present invention is an adjustable shaft and hosel assembly for a golf club head, the adjustable shaft and hosel assembly comprising a shaft sleeve comprising a joint portion, a hosel portion, and a fitting piece, wherein the adjustable shaft and hosel assembly can independently alter a loft angle, a lie angle, and a face angle of the golf club head. The assembly further comprises a fastener, the joint portion is a side key ball joint, and the hosel portion is integrally formed with the golf club head. The loft angle, lie angle, and face angle of the golf club head may be adjusted using an angle adjustment tool, and in this embodiment the shaft sleeve does not need to be removed from the hosel portion for a user to make angular adjustments.

The adjustable shaft and hosel assembly may further comprise a shaft having graphics and a grip reminder, wherein the shaft is at least partially disposed within the shaft sleeve, and wherein the graphics and the grip reminder do not rotate out of orientation with the golf club head when a user makes angular adjustments. In this embodiment, torque forces are transmitted between the golf club head and the shaft. The loft, lie, and face angles of the golf club head may each have an angular adjustment range of 0° to ≧2° from a reference axis.

Another aspect of the present invention is an adjustable shaft and hosel assembly for a golf club head, the adjustable shaft and hosel assembly comprising a shaft sleeve comprising an extension portion and a side key ball joint, a fitting piece sized to receive the side key ball joint, a hosel portion integrally formed with the golf club head and sized to receive the fitting piece, a first shim encircling the shaft sleeve and having an upper surface and a lower surface, a second shim encircling the hosel piece and having an upper surface and a lower surface, and a fastener, wherein the upper surface of the first shim is nonparallel with the lower surface of the first shim, wherein the upper surface of the second shim is non parallel with the lower surface of the second shim, and wherein a lie angle, a loft angle, and a face angle of the golf club head can be adjusted by rotating the first shim around the shaft sleeve and the second shim around the hosel portion. The first and second shims each have angle indicators on their exterior surfaces, and the shaft sleeve does not need to be removed from the hosel portion for a user to make angular adjustments.

A further embodiment of this aspect of the present invention may comprise a shaft having graphics and a grip reminder, wherein the shaft is at least partially disposed within the shaft sleeve, and wherein the graphics and the grip reminder do not rotate out of orientation with the golf club head when a user makes angular adjustments. The loft, lie, and face angles of the golf club head may each have an angular adjustment range of 0° to ≧2° from a reference axis.

Yet another aspect of the present invention is an adjustable shaft and hosel assembly for a golf club head, the adjustable shaft and hosel assembly comprising a shaft sleeve comprising an extension portion and a side key ball joint, a fitting piece sized to receive the side key ball joint, a hosel portion integrally formed with the golf club head and sized to receive the fitting piece, a first wheel having a first bore with a first diameter, a second wheel having a second bore with a second diameter that is smaller than the first diameter, and a fastener, wherein the fastener affixes the first and second wheels to the shaft sleeve, and wherein a lie angle, a loft angle, and a face angle of the golf club head can be adjusted by rotating the first and second wheels. The first and second wheels may each have angle indicators on their exterior surfaces. The first bore provides a pivot surface and the second wheel causes the fastener to move along the pivot surface when the second wheel is turned. The shaft sleeve does not need to be removed from the hosel portion for a user to make angular adjustments.

In a further embodiment of this aspect of the invention, the shaft and hosel assembly comprises a shaft having graphics and a grip reminder, wherein the shaft is at least partially disposed in the shaft sleeve, and wherein the graphics and the grip reminder do not rotate out of orientation with the golf club head when a user makes angular adjustments.

Yet another aspect of the present invention is a method of adjusting a loft, lie, or face angle of a golf club head, the method comprising providing a golf club head having a hosel portion with a hosel bore extending from a sole of the golf club head to a top most portion of the hosel portion, providing a fitting member sized to be received within the hosel bore and to move along a first axis within the hosel bore, providing a shaft sleeve with a universal joint connection sized to be received within the fitting member and to move along a second axis within the fitting member that is perpendicular to the first axis, the universal joint portion comprising a joint bore, providing a fastener to be received within the joint bore, rotating the shaft sleeve to have a desired angle with respect to the golf club head, and tightening the fastener so that the shaft sleeve retains the desired angle.

Having briefly described the present invention, the above and further objects, features and advantages thereof will be recognized by those skilled in the pertinent art from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a side, perspective view of a golf club head having the adjustability features included in each embodiment of the present invention.

FIG. 2 is top perspective view of a first embodiment of the invention.

FIG. 3 is a side, cross sectional view of the embodiment shown in FIG. 1.

FIGS. 4A through 4D are side, cross sectional views of assembled shaft sleeve, fitting member, and hosel portions of the embodiment shown in FIG. 2.

FIG. 5 is an exploded view of shaft sleeve, fitting member, and hosel portions of the embodiment shown in FIG. 1.

FIGS. 6A and 6B are top, cross-sectional views of fitting members available for use in connection with the embodiment shown in FIG. 1.

FIG. 7A is a side plan view of upper and lower shim portions of the embodiment shown in FIG. 1.

FIG. 7B is a side plan view of a single shim that can be used in another embodiment.

FIG. 8A is a top plan view of the upper and lower shim portions assembled with the shaft sleeve.

FIG. 8B is a side, cross-sectional view of the embodiment shown in FIG. 7A.

FIG. 9A is a diagram showing the forces involved in one configuration between a flange and a fastener assembly

FIG. 9B is a diagram showing the forces involved in another configuration between a flange and a fastener assembly.

FIG. 10 is a bottom perspective view of a golf club head having a second embodiment of the present invention.

FIG. 11 is a cross-sectional view of the embodiment shown in FIG. 7.

FIG. 12 is a plan view of the wheels of the embodiment shown in FIG. 7.

FIG. 13 is a side perspective view of a third embodiment of the present invention interacting with an angle adjustment device.

DETAILED DESCRIPTION OF THE INVENTION

Angular adjustability in a golf club head is achieved through universal movement of the golf club shaft with respect to the golf club head, which almost always requires the shaft to rotate around a reference axis. As shown in FIG. 1, unlike other adjustable golf club designs currently available on the market, the present invention allows for universal angular adjustment without requiring the shaft 12, and thus the grip 13, to rotate about a reference axis 80 more than 5 degrees, if at all. As shown, for example, in FIG. 8B, the shaft 12 is disposed within a shaft sleeve 20 having a bore axis that is coaxial with the overall shaft sleeve 20 axis, such that a shaft 12 disposed within the shaft sleeve 20 is coaxial with, and not angled with respect to, the shaft sleeve 20. During adjustment of the golf club of the present invention, rotation of the shaft sleeve 20, and thus the shaft 12, around the reference axis 80 is limited or non-existent for the full range of shaft 12 angle adjustability, represented by “A” in FIG. 1, with respect to the golf club head 100 around a rotation point 85. Preferably the full range of adjustability A allows for at least 0.75 degree of hosel axis tilt in any direction. In the present invention, the torque forces between the golf club head 100 and shaft 12 are coupled and, because there is limited or no rotation about the reference axis 80, the shaft graphic and/or the grip reminder 14 remain oriented with the club head body during angular adjustment, as shown in FIG. 1 with respect to shaft-head angles A₁, A₂, and A₃. The full range of shaft 12 angle adjustability A in the present invention includes the 0° angle with respect to the reference axis 80.

In addition to having non-ideal adjustability features, many of the adjustable golf club heads currently available on the market are difficult to use because they require a user to make minute linear movements with respect to a pivot point to achieve the desired angular change. For example, a 1° change that is made using an adjustability feature located 1 inch from the pivot point requires the user to make a precise, 0.0174 inch linear movement. In contrast with the currently available technology, the present invention includes precise methods for setting and fixing the angular adjustments desired.

The present invention provides golfers with a structure that can be used to easily and quickly modify club specifications such as loft, lie and face angle of their golf club. This invention enables golfers to change these specifications at the practice range or golf course. The tools used to alter the club's specifications are few in number and can be carried in a pocket of the user's golf bag. Furthermore, the technical ability required to modify the club specifications with this invention is minimal and its approach is intuitive and easy to understand.

The present invention is also valuable because a golfer's swing often changes over time, which can require alterations to his clubs. A golfer may improve his game through lessons and may gain greater flexibility and strength through practice and exercise. As such, it is reasonable for a golfer to wish to change his club's face, lie, and/or loft angles to help improve his accuracy, distance, and feel as needed or desired. This applies to all types of golf clubs. In fact, though the Figures show the present invention in connection with a driver-type golf club head, the embodiments of the present invention disclosed herein may be used in connection with other wood-type golf club heads as well as with irons and putters.

A preferred embodiment of the present invention is shown in FIGS. 1-8B. This adjustable hosel assembly 10 includes a shaft sleeve 20, a hosel 30, an upper tubular adjustment piece, referred to herein as a shim 40, a lower tubular adjustment piece, also referred to herein as a shim 50, a fastener 60, and a fitting member 70, and is associated with a golf club head 100 having a crown 110, sole 120, and face 130. The assembly 10 also includes a ferrule 150, which can envelope or lie against the shaft (not shown) or the shaft sleeve 20, as shown in FIG. 8B. As shown in FIGS. 3 and 4A-D, the shaft sleeve 20 includes a universal joint connection 25, which preferably is a protrusion that is flat 25a on two opposing sides, as shown in FIG. 4A, and curved or spherical 25b on the other two opposing sides, as shown in FIGS. 4B-D. As shown in FIGS. 4B-D, the spherical portions 25b of the universal joint connection 25 may have different diameters.

In the preferred embodiment, the fitting member 70 fits within the hosel 30 of the adjustable hosel assembly 10. As shown in FIG. 5, the mouth 32 of the hosel 30 is shaped to receive the fitting member 70 by having two flat sides and two curved sides. As shown in FIGS. 5, 6A, and 6B (an alternative embodiment to the one shown in FIG. 6A), the universal joint connection 25 fits within the fitting member 70 and can move within the fitting member 70 along a first axis 81. Similarly, the fitting member 70 can move within the hosel mouth 32 along a second axis 82. The two axes 81, 82 are disposed at 90° angles with respect to one another, and provide full, 360° rotation capability for the shaft sleeve 20, and thus the shaft (not shown), with respect to the golf club head 100.

When the universal joint connection 25, fitting member 70, and hosel 30 are fully assembled with upper and lower shims 40, 50 described herein and shown in FIG. 7A, the universal joint connection 25, and hence the shaft sleeve 20, is capable of moving 360° around a rotation point 85 located on the shaft reference axis 80. The greatest force in this assembly is applied within the hosel 30 with respect to the fitting member 70 and universal joint connection 25. In contrast with other adjustable hosel designs currently available on the market, the shims 40, 50, which are located proximate to or around the rotation point 85 to control angular adjustment, as shown in FIGS. 3, 7A, and 8B, do not bear the brunt of the force between the shaft sleeve 20 and the golf club head 100.

As shown in FIG. 7A, the shims 40, 50 each have non-parallel (tapered), mating upper surfaces 42, 52 and lower surfaces 44, 54 and work together by moving the shaft sleeve 20, and thus an installed shaft (not shown), so that it has a desired angle with respect to the hosel 30 and thus the golf club head 100. In other words, the shims 40, 50 allow a user to rotate the shaft sleeve 20, and thus the shaft, from 0° to a desired maximum degree angle with respect to the reference axis 80. The angle α between the upper and lower surfaces 42, 44 of the upper shim 40 may be equivalent to the angle β between the upper and lower surfaces 52, 54 of the lower shim 50, or they may differ. The upper surface 42 of the upper shim 40 may be parallel with the lower surface 54 of the lower shim 50, or these surfaces 42, 54 may be non-parallel. In an alternative embodiment, the shims 40, 50 may be combined into a single adjustment piece 75 having non-parallel upper and lower sides 76, 77 as shown in FIG. 7B and angles β/2 between their upper and lower sides 76, 77 and a midline 78.

In the preferred embodiment shown in FIG. 7A, the shims 40, 50 include angle markings 45, 55 on their sides to permit a user to select a desired shaft sleeve 20 angle. The shims 40, 50 may also include locating pins and sockets to receive said pins to permit a user to more easily select the desired shaft sleeve angles, as shown in U.S. Pat. No. 2,027,452 to Rusing, the relevant disclosure of which is incorporated by reference in its entirety herein Preferably, the number of angular positions provided by the shims 40, 50 is determined by the formula of A*N positions created between the first contact surface set, such as the lower surface 54 of the lower shim 50 and its contact surface on the hosel 30, and B*N positions created between a second contact surface set of the upper surface 52 of the lower shim 50, and the lower surface 44 of shim 40, and C*N positions created between a third contact surface set of the of the upper surface 42 of shim 40 and its contact surface on the shaft sleeve 20, wherein each of A, B, C, and N can be an integer. The relationships between these formulae can be A=C>B, C≧B≧A=1, A≧B≧C=1, C≧B≧A≧0 or A≧B≧C≧0. This can be repeated for systems of i contact surface sets, where i is an integer and i≧3.

The shims 40, 50, shaft sleeve 20, fitting member 70, and hosel 30 of the golf club head 100 are held together by the fastener 60. The fastener 60, which in the preferred embodiment is a bolt or screw, is inserted through an opening 125 in the sole 120 of the golf club head 100 and engages the universal joint connection 25 of the shaft sleeve 20, which includes a hollow, threaded bore 22 sized to receive the fastener 60. In an alternative embodiment, the fastener 60 comprises one or more snap rings, which may or may not be permanently attached to the hosel assembly 10. In the preferred embodiment, the fastener 60 provides the preload force necessary to hold the other components of the embodiment together during use. The component sizes of these connections are what limit the maximum angular adjustment. Removal of the shaft is not necessary for angular adjustment in the preferred embodiment—instead, the fastener 60 needs only to be loosened from the shaft sleeve 20 so that the component parts can be rotated with respect to each other.

As shown in FIGS. 3 and 8B, the fastener 60 preferably includes a head 62 and a threaded portion 64. In the preferred embodiment, the head 62 of the fastener 60 abuts a flange 35 located within the hosel 30, against which the fitting member 70 can also rest. The flange 35 provides a brace towards which the fastener 60 pulls the other components of the adjustable hosel assembly 10 when fully assembled. The flange 35 is preferably formed integrally with the hosel 30, but may, in an alternative embodiment, be formed as a separate piece and bonded to the hosel 30. As shown in FIG. 8B, the fastener 60 pulls the shaft sleeve 20 towards the hosel 30, trapping the shims 40, 50 between the ferrule 150 (or another ledge provided by the shaft sleeve 20) and the hosel 30, and pressing the upper shim 40 (or, in an alternative embodiment, the single shim 75) against the ferrule 150 (or the other ledge provided by the shaft sleeve 20), thus causing the shaft sleeve 20 to tilt with respect to the head 100. In this way, an angle between the shaft sleeve 20 and the head 100 that is selected by a user by rotating the shims 40, 50 around the shaft sleeve 20 can be semi-permanently fixed for use during a round of golf.

The present invention is functional when the contact surface between the fastener 60 and flange 35 is flat, as shown in FIG. 3. This flat-surface configuration is not ideal, however, because when the shaft sleeve 20 is moved with respect to the reference axis 80, the shaft sleeve 20 changes position within the hosel 30 and moves the fastener 60. When the fastener 60 is tightened, the alignment forces on the hosel 30 from contact between the golf club head 100 the shaft sleeve 20, and the shims 40, 50 create a moment on the shaft sleeve 20 which in turn creates a moment on the fastener 60 around the rotation point 85, and creates a resultant frictional force opposite the fastener's 60 motion. The greater the angle between the reference axis 80 and the resulting axis 83 of the shaft sleeve, i.e., the greater the angular options offered by the shims 40, 50 in the preferred embodiment, the more frictional force is created. When this happens, the fastener 60 may not securely hold the shaft sleeve 20 in the desired position with respect to the reference axis 80, and there can be unwanted slippage that can affect the angle of the shaft sleeve 20 with respect to the golf club head 100.

This problem can be overcome by incorporating into the hosel 30 a flange 35 that has a convex lower surface 36, as shown in FIG. 8B. The radius of the convex surface is preferably between 0.1 to 3.0 inches, and most preferably matches the distance R between the pivot or rotation point 85 of the shaft sleeve 20 and the point 87 at which the fastener head 62 contacts the flange 35. The convex lower surface 36 may be integrally formed with the flange 35, or it may be a separate piece that is bonded to a lower surface of the flange 35 after the flange 35 and hosel 30 are formed. The head 62 of the fastener 60, or a washer 140 disposed between the fastener head 62 and the flange 35, preferably has a concave surface 62a that mates with the convex lower surface 36 of the flange, and permits the head 62 to slide along the convex lower surface 36 as a user adjusts the angular relationship between the shaft and the golf club head 100. In an alternative embodiment, the flange 35 may have a concave surface and the fastener head 62 or washer 140 may have a mating convex surface.

FIGS. 9A and 9B illustrate the forces present in the flat-surface and curved-surface configurations described herein. With reference to each of these Figures, F is the alignment force that results from assembling the adjustable hosel assembly 10, M is the resultant moment about the rotation point 85, derived from the equation F-2FL, R is the distance from the rotation point 85 to the contact point 87 between the fastener head 62 and the flange 35, L is the distance from the rotation point 85 to the adjustment surface's contact force, μ is the coefficient of friction, T is the mating force between the fastener 60 and the shaft sleeve 20, F_m is the relocation moment force due to the adjustment, also represented as M/R, and F_f is the frictional force between the fastener and the fixed head surface.

As shown in FIG. 9A, the reaction forces at P created by the flat-surface configuration are not aligned with the fastener surface, as compared to the reaction forces at P′ created by the curved-surface configuration, shown in FIG. 9B, which are tangent and normal to the surfaces. In fact, the alignment forces in FIG. 9B are greater than the frictional forces created by the adjustable hosel assembly 10, which is beneficial because the alignment forces must be greater than the frictional forces for moment to accord during the fastening process. If there is a misalignment of the alignment surfaces between the flange 35 and the head 62 of the fastener 60, the curved surface configuration described herein has a F_M with a larger value than F_M cos(θ), associated with the flat-surface configuration, if both are clamped by the same T mating force and the alignment moment is the some.

In order to prevent loss of the fastener 60 after it is loosened to adjust the angle of the shaft sleeve 20, the fastener 60 may be retained within the hosel 30 of the golf club head 100 by any number of mechanisms or features, including those disclosed in U.S. Pat. No. 8,002,644, the disclosure of which is hereby incorporated in its entirety herein. In the preferred embodiment, the fastener 60 is retained within the hosel 30 by means of an o-ring 160 attached to the threaded portion 64 of the fastener 60 after it is inserted into the hosel 30, such that the flange 35 is sandwiched between the head 62 of the fastener 60 or a washer 140 and the o-ring as shown in FIG. 7B.

A second embodiment of the present invention is disclosed in FIGS. 10 and 11. This embodiment has the same components shown in FIG. 5, including the shaft sleeve 20 with a universal joint connection 25 that preferably is flat on two sides and spherical on two sides, a fitting member 70, a hosel 30 with a hosel mouth 32 to receive the fitting member, and a fastener 60. Instead of shims 40, 50, however, the shaft angle of the second embodiment is adjusted using a pair of eccentric wheels 90, 95 that are disposed within and accessible via an opening 125 in the sole 120 of the golf club head.

The wheels 90, 95 each have bores 92, 97 through their centers to receive the fastener 60 and are connected to the shaft and hosel assembly 10 via the fastener 60, as shown in FIGS. 10 and 11. The fastener head 62, or a washer 140 with which it interacts, may also have the same concave structure discussed herein, and the outermost wheel 95 may have a mating convex structure to minimize unwanted friction or slippage during operation of the assembly 10. As shown in FIG. 12, the first wheel 90 bore 92 has a diameter that is larger than of the second wheel 95 bore 97 and creates a pivot surface 98. The second wheel 95 bore 97 is sized so that it snugly receives the fastener 60 and guides the fastener 60 around the pivot surface 98 as the second 95 wheel is turned. The first wheel bore 92 may have dimensions of 1° by 1 inch by R0.0175 inch. The wheels 90, 95 are preferably marked with angle indicia.

The first wheel 90, which is closest to the golf club head, sweeps the shaft sleeve 20 the desired angle 360° around the reference axis 80. The second wheel 95 rotates the shaft sleeve 20 from 0° to the maximum degree with respect to the reference axis. Combinations of these rotations modify the loft, lie, and face angles by rotating the universal joint connection 25, and thus the shaft sleeve 20 and the shaft (not shown) around the reference axis 80.

A third embodiment of the present invention is shown in FIG. 13. This embodiment has the same components shown in FIG. 5, including the shaft sleeve 20 with a universal joint connection 25 that preferably has two flat sides and two spherical sides, a fitting member 70, a hosel 30 with a hosel mouth 32 to receive the fitting member, and a fastener 60. This embodiment may also utilize the convex outermost wheel 95 and concave fastener head 62 configuration to reduce unwanted slippage. The angle of the shaft with respect to the golf club head in this embodiment, however, is adjusted using an angle adjustment tool 200, shown in FIG. 13.

The angle adjustment tool 200 preferably has tapered gauge thicknesses 210, 215, 220, 225, 230, 235, 240, 245 at multiple locations around its circumference. The tool 200 is used to set a desired gap angle between the shaft sleeve 20 and hosel 30. The combination of the gap angles of the tool 200 and the orientation of the tool 200 about a reference axis 80 modifies the loft, lie, and face angle of the golf club head. In order to make an adjustment, the fastener 60 is loosened so that a gap angle between the shaft sleeve 20 and the hosel 30 can be adjusted. Once the shaft sleeve 20 is adjusted to have the desired angle with respect to the hosel 30, the fastener is tightened so that the golf club head retains the chosen angle. The fastener head 62, or a washer 140 with which it interacts, and a flange 35 may further have the concave-convex structure discussed in detail herein.

The embodiments of the adjustable shaft and hosel assembly 10 described herein allow for universal angular adjustment, and also allow a user to remove the shaft sleeve from the hosel portion entirely so that a different shaft and/or shaft sleeve can be attached to the golf club head. Preferably, for each of the embodiments, the angular adjustment range is a minimum of 0° to ≧2° from the reference axis 80. The assembly 10 of the present invention allows for torque forces to be transmitted between the body and the shaft, and visa-versa. The universal joint connection 25 also prevents shaft graphics and grip reminders on a golf club shaft from rotating out of orientation from the club head.

The embodiments disclosed herein may be made of any number of materials, including those material compositions disclosed in U.S. Pat. Nos. 6,244,976, 6,332,847, 6,386,990, 6,406,378, 6,440,008, 6,471,604, 6,491,592, 6,527,650, 6,565,452, 6,575,845, 6,478,692, 6,582,323, 6,508,978, 6,592,466, 6,602,149, 6,607,452, 6,612,398, 6,663,504, 6,669,578, 6,739,982, 6,758,763, 6,860,824, 6,994,637, 7,025,692, 7,070,517, 7,112,148, 7,118,493, 7,121,957, 7,125,344, 7,128,661, 7,163,470, 7,226,366, 7,252,600, 7,258,631, 7,314,418, 7,320,646, 7,387,577, 7,396,296, 7,402,112, 7,407,448, 7,413,520, 7,431,667, 7,438,647, 7,455,598, 7,476,161, 7,491,134, 7,497,787, 7,549,935, 7,578,751, 7,717,807, 7,749,096, and 7,749,097, the disclosure of each of which is hereby incorporated in its entirety herein. Furthermore, the shims 40, 50, and fitting member 70 may be composed of lightweight materials, such as plastic, composite, aluminum, titanium alloy, and/or other such materials.

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.

Claims

1. An adjustable golf club head comprising: a face;a sole;a crown;a shaft sleeve having a shaft sleeve axis and a shaft-receiving bore, the shaft receiving bore having a bore axis that is coaxial with the shaft sleeve axis;a hosel having a hosel bore extending from the sole to the crown, at least part of the hosel bore having a diameter sized to receive at least a part of the shaft sleeve;a first tubular adjustment piece having non-parallel upper and lower surfaces;a flange within the hosel bore, wherein the flange comprises a convex tower surface; anda fastener comprising a fastener head and a threaded body,wherein the first tubular adjustment piece fits around a section of the shaft sleeve when at least a part of the shaft sleeve is inserted within the hosel bore,wherein rotating the first tubular adjustment piece around the shaft sleeve changes the angle of the shaft sleeve with respect to the face,wherein the first tubular adjustment piece provides a plurality of angular adjustments,wherein the shaft sleeve does not rotate around the bore axis more than 5 degrees for all of the plurality of angular adjustments,wherein the fastener is inserted into the hosel bore through the sole,wherein the threaded body engages the shaft sleeve to connect the shaft sleeve to the head,wherein the fastener head abuts the convex lower surface of the flange when the threaded body is fully engaged with the shaft sleeve,wherein the shaft sleeve further comprises a universal joint connection having a joint bore sized to securely receive the threaded body of the fastener,wherein the universal joint connection protrudes from a lower portion of the shaft sleeve, andwherein the universal joint connection comprises at least two planar sides and at least two curved sides.

2. The adjustable golf club head of claim 1, wherein the fastener head comprises a concave surface that mates with the convex lower surface of the flange.

3. The adjustable golf club head of claim 1, wherein a radius of the convex lower surface is equivalent to a distance between a rotation point of the shaft sleeve and a point at which the fastener head makes contact with the flange.

4. The adjustable golf club head of claim 1, wherein a radius of the convex lower surface is 0.1 to 3.0 inches.

5. The adjustable golf club head of claim 1, further comprising a fitting member sized to fit within the hosel bore proximate the crown, the fitting member comprising a fitting member bore sized to receive the universal joint connection.

6. The adjustable golf club head of claim 5, wherein the fitting member can move within the hosel bore along a first axis, and wherein the universal joint connection can move within the fitting member bore along a second axis.

7. The adjustable golf club head of claim 6, wherein the first axis is perpendicular to the second axis.

8. The adjustable golf club head of claim 7, wherein the shaft sleeve has a 360 degree range of angular movement around a rotation point when the fitting member and the universal joint connection are fully assembled with the hosel.

9. The adjustable golf club head of claim 1, further comprising a second tubular adjustment piece having non-parallel upper and lower surfaces, wherein the second tubular adjustment piece is disposed proximate the first tubular adjustment piece.

10. The adjustable golf club head of claim 9, wherein the first and second tubular adjustment pieces each comprise one or more markings on an external surface, and wherein the one or more markings indicate angular adjustments provided by said adjustment pieces.

11. The adjustable golf club head of claim 1, wherein the adjustable golf club head is a wood-type golf club head.

12. The adjustable golf club head of claim 11, wherein the adjustable golf club head is a driver golf club head.

13. An adjustable driver head comprising: a face;a sole;a crown;a shaft sleeve comprising a shaft sleeve axis, a shaft-receiving bore having a bore axis that is coaxial with the shaft sleeve axis, and a universal joint connection protruding from a lower portion of the shaft sleeve, wherein the universal joint connection comprises at least two flat sides and at least two curved sides, and wherein the universal joint connection further comprises a threaded joint bore;a fitting member comprising a fitting member bore and an external surface, wherein each of the fitting member bore and the external surface have at least two flat sides and at least two curved sides, and wherein the fitting member bore is sized to receive the universal joint connection;a hosel comprising a hosel bore extending from the sole to the crown, wherein a region of the hosel bore proximate the crown comprises at least two flat sides and at least two curved sides and wherein the region of the hosel bore proximate the crown is sized to receive the fitting member;first and second tubular adjustment pieces, each comprising non-parallel upper and lower surfaces, wherein the first tubular adjustment piece fits around the shaft sleeve when the universal joint connection is assembled with the fitting member and the hosel bore; anda fastener comprising a head and a threaded body, wherein the threaded body engages the threaded joint bore,wherein rotating the first and second tubular adjustment piece around the shaft sleeve changes the angle of the shaft sleeve with respect to the face, andwherein the shaft sleeve does not rotate around the bore axis more than 5 degrees.

14. The adjustable driver head of claim 13, further comprising a flange disposed within the hosel bore, wherein the fastener head abuts the convex lower surface of the flange when the threaded body is fully engaged with the threaded joint bore, andwherein the flange comprises a convex lower surface having a radius that is equivalent to a distance between a rotation point of the shaft sleeve and a point at which the fastener head makes contact with the flange.

15. The adjustable driver head of claim 14, wherein the radius is between 0.1 and 3 inches.