Abstract: A golf club system has at least one golf club shaft assembly and a plurality of detachable golf club head assemblies. The golf club shaft assembly includes a shaft segment, a grip, and a coupler. The golf club head assembly includes a golf club head, a head shaft segment, and a head coupler pin to reversibly mate the golf club head assembly to a golf club shaft assembly to make a golf club. Any one of the golf club head assemblies can be attached to the golf club shaft assembly using a coupler. A second coupler allows the at least one golf club shaft assembly to be split into an upper shaft segment and a lower shaft segment to reduce the size of the golf club system. The golf club system can include a golf bag to hold the at least one shaft and plurality of detachable golf club head assemblies.

Abstract: A temporary shaft-component connection for assembling a selected golf club shaft with a club head and/or hand grip segment is disclosed to facilitate custom club design and fitting. The temporary shaft-component connection is designed for use with nonmetallic club shafts formed from a graphite-based composite material or the like having a range of different lengths and stiffness characteristics. In a shaft-head connection, a metal adapter insert is mounted onto a lower end of the club shaft and includes one or more flat surfaces for reception into a matingly shaped socket in the hosel of a selected club head to prevent relative rotation between the club shaft and head. A compression nut carried on the shaft is threaded onto the hosel to axially engage and retain a thrust flange on the shaft or adapter or adapter insert, to prevent axial separation of the club head and shaft.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: An iron-type golf club head is disclosed including a main body including a heel portion, a sole portion, a toe portion, a top-line portion, a front portion, a rear portion, and a striking face. The main body has a recessed region including a relief region in the front portion. A replaceable striking plate is inserted into the recessed region and the relief region. The replaceable striking plate includes a front surface, a first rear surface region and a second rear surface region. A threaded opening is located on the rear surface of the replaceable striking plate and receives a fastener to retain the replaceable striking plate on the front portion of the main body and within the recessed region and relief region.

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, a hosel portion, and at least two tubular adjustment pieces having non-parallel upper and lower surfaces, wherein the tubular adjustment pieces include loft and lie angle indicators that can be added together to determine overall club head loft and lie angles.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: An adjustable hosel assembly allows for adjustment of shaft angle and the distance between the shaft and the club head. The adjustable hosel assembly comprises a hosel portion, a cam piece, a bolt, and a golf club head having a convex or concave surface, wherein the hosel portion can move along the surface of the cam piece, and the cam piece can move along the surface of the club head, to adjust the orientation of a shaft placed within the hosel with respect to the club head, and wherein the bolt secures the cam piece and the hosel to the golf club head.

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, a hosel portion, and a ball joint, wherein the ball joint is located either on the shaft sleeve or the hosel portion and fits within, and is rotatable along various axes within, a socket.

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, a hosel portion, and at least two tubular adjustment pieces having non-parallel upper and lower surfaces, wherein the tubular adjustment pieces include loft and lie angle indicators that can be added together to determine overall club head loft and lie angles.

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.

Abstract: A length adjustment system for joining a golf club head to a shaft is provided. The length adjustment system may be utilized to produce a minor length and an intermediate length of a golf club. In a minor length configuration, the length adjustment system includes a shaft sleeve attached to an end of the shaft. The minor length configuration also features a minor length weight system. The intermediate length configuration further includes a first hosel sleeve and an intermediate length weight system. The length adjustment system results golf club that has similar characteristics in each configuration.

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.

Abstract: A golf club 2 is provided with a head 4, a shaft 6, a tip member 8, and a screw member 10. The shaft 6 is inserted into a shaft hole of the tip member 8, and a tip part of the shaft 6 is fixed to the shaft hole. An axis line s1 of the shaft 6 is inclined with respect to an axis line z1 of the tip member 8. The head 4 has a head hole into which the tip member is inserted, a head side engaging part capable of being engaged with the tip member 8 inserted into the head hole, and a through hole into which the screw member 10 can be inserted. The tip member 8 has a shaft side engaging part 38 capable of being engaged with the head side engaging part. Circumferential relative positions A in which the head side engaging part and the shaft side engaging part can be engaged with each other are M kinds.

Abstract: A system for fitting golf clubs to golfers that enables an overall club length to be varied without varying a length of a shaft. The system enables a greater number of combinations of club characteristics, such as shaft flex, brand, and length, to be contained within a club fitting cart and/or for a same number of combinations of club characteristics to be contained within a smaller cart.

Abstract: A golf club includes: a hosel of a head to which a leading end of a shaft is attached; a weight material for adjusting weight being provided in a lower end portion of a hosel hole; and a communication opening which communicates the lower end portion of the hosel hole with an inside of the head, wherein the weight material is detachably screwed into the communication opening.

Abstract: A golf club includes: a shaft; a head including a hosel formed with a hosel hole; a shaft case with a substantially tube shape being bonded to a leading end of the shaft, the shaft case being inserted into the hosel hole, the shaft case being fixed to the hosel by a ring-shaped screw member fitted onto an upper portion of the shaft case and detachably screwed into a female screw in an inner circumferential surface of the hosel hole, wherein an outer side surface of a lower side part of the shaft case and a lower side part of the hosel hole have non-circular cross-section shapes.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: (a) a first cylindrical structure having a cylindrical interior chamber for receiving a golf club shaft, a first rotation-inhibiting structure, and a securing structure; (b) a second cylindrical structure having a borehole for receiving the first cylindrical structure, and a second rotation-inhibiting structure that engages the first rotation-inhibiting structure and (c) a securing system for releasably engaging the securing structure. The shaft may extend at an angle from the shaft connection assembly so as to allow adjustment of the shaft position with respect to the club head by rotating the first cylindrical structure or exchanging the second cylindrical structure.

Abstract: A golf club head with a leading end of a shaft mountable thereon, the golf club head includes: a head main body, formed with a hosel insertion hole; a hosel, formed with a shaft case insertion hole and removably mounted in the hosel insertion hole; and a shaft case, formed with a shaft insertion hole and removably mounted in the shaft case insertion hole.

Abstract: A golf club comprises a shaft, a club head, and a connection assembly that allows the shaft to be easily disconnected from the club head. In particular embodiments, the connection assembly includes a removable hosel sleeve that allows a shaft to be supported a desired predetermined orientation relative to the club head. In this manner, the shaft loft and/or lie angle of the club can be adjusted without resorting to traditional bending of the shaft. In another embodiment, the club head has an adjustable sole that can be adjusted upwardly and downwardly relative to the strike face of the club head, which is effective to adjust the face angle of the club head.

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.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: (a) a shaft engaging member including a rotation-inhibiting structure; (b) a club head engaging member including a shaft-receiving chamber and a retaining structure for engaging the rotation-inhibiting structure; and (c) a securing system for releasably securing the shaft engaging member with respect to the club head engaging member. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft engaging member so as to allow adjustment of the shaft position with respect to the club head.

Abstract: A golf putter head with a front portion comprising traditional shape and appearance, with an integral face insert extending through the head to an alignment and weighting portion extending beyond the main body of the putter, adding improved alignment, increased moment of inertia (MOI) and adjustable weighting and adjustable balance and optimizable center of percussion. The putter head comprises a central face insert portion extending through the body and above the traditional weight flange, with mass relieved portions below the top of the alignment piece in order to receive one or more optional weights, and the upper side of the rearwardly extending portion being engraved or marked with various alignment indicia, and the whole through-head insert face portion and rearwardly extending portion being affixed to the base portion of the head at least in part with threaded fasteners.

Abstract: A golf club comprises a shaft, a club head, and a connection assembly that allows the shaft to be easily disconnected from the club head. In particular embodiments, a sleeve including a top portion, a middle portion connected to the top portion is described. The middle portion includes a thin wall thickness. A bottom portion is connected to the middle portion including a plurality of engaging surfaces. A central longitudinal axis and an offset angle offset from the central longitudinal axis is described. The offset angle allows a maximum loft change of about 0.5 degrees to about 4.0 degrees. The total weight of the sleeve is less than 9 g.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include: a shaft adapter, a shaft retainer, and a club head having an interior chamber. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts. Furthermore, the shaft may be bent or otherwise extend at an angle from the shaft adapter so as to allow adjustment of the shaft position with respect to the club head.

Abstract: A system of interchangeable club heads sharing one or more shafts and golf bag for carrying the club heads and one or more shafts. The club heads contain a shaft segment to set club length and a coupler to interconnect to the shaft and grip. The shaft contains an opposite gender coupler. The system is very lightweight and much more portable than a conventional set of golf clubs. It also creates the opportunity for players to match club heads with shafts with differing performance characteristics. Additionally, it solves a problem for golfers using long shafts on putters. These long shafts can now be disassembled for storage and transport.

Abstract: A golf club head includes: a head main body formed with a hosel column inserting hole; a hosel column which is formed with a shaft inserting hole and is installed on the hosel column inserting hole; a bolt inserting hole penetrating from a sole side of the head main body to the hosel column inserting hole; and a bolt which is inserted into the bolt inserting hole and is screwed into the hosel column, wherein: the hosel column includes a trunk portion provided with a shaft inserting hole, and a leg portion which protrudes from a lower end surface of the trunk portion and is inserted into the hosel column inserting hole; and at least a lower end side of the leg portion and an inner portion of the hosel column inserting hole are polygonal sectional shape portions and are engaged with each other.

Abstract: A golf club head system and a golf club head for inclusion into a golf club are provided. The golf club head includes a main body member and a secondary body member. The main body member has a striking surface, a sole portion, a crown portion, and a rear face substantially opposed to the striking surface. The main body member defines an at least substantially enclosed main body cavity. The secondary body member is attached to the main body member and extends at least substantially over the entire rear face of the main body member. The golf club head system includes two or more secondary body members, each configured for interchangeable attachment to a main body member. Each secondary body member defines an internal concavity, has a different external shape, and has a different combination of center-of-gravity and moment-of-inertia characteristics.

Abstract: A variable length shaft assembly comprising at least one upper shaft portion, a lower shaft portion and a threaded fastener, wherein the threaded fastener removably connects the upper shaft portion to the lower shaft portion, is disclosed herein. The variable length shaft assembly may further comprise at least two upper shaft portions having different lengths so a golfer can adjust the total length of the shaft by removing one upper shaft portion and replacing it with another upper shaft portion having a different length. Methods of adjusting the length of a golf club shaft without damaging any portion of the shaft and variable length shaft kits are also disclosed herein.

Abstract: A golf club head includes: a head main body having a shaft holder inserting hole; a shaft holder which has a shaft inserting hole and is attachably and detachably installed in the shaft holder inserting hole; a bolt inserting hole which penetrates from a sole side of the head main body to the shaft holder inserting hole; and a bolt which is inserted into the bolt inserting hole, screwed into the shaft holder, and fixes the shaft holder to the head main body, an axis center of the shaft inserting hole and an axis center of the shaft holder inserting hole being non-coaxial shapes, wherein a lower end side of the shaft holder and an inner portion of the shaft holder inserting hole are polygonal sectional shape portions and are engaged with each other.

Abstract: Compact golf club set configurable during game play at player discretion prior to shot play, comprising: Adjustable-length shaft 100 in discrete length positions 165 in telescoping handle 110; adjustable-length shaft 100 including head interchange mechanism 170; Interchangeable head 200, 300, 400 in adjustable-length shaft 100, with fixed loft head options 201, 301, 401; adjustable loft heads 202, 302 incorporating adjustable loft mechanism 500a, 500b, and sole 504 whose geometry 545 keeps adjustable loft heads 202, 302 horizontal on the ground; Interchangeable fixed or adjustable loft head, encompassing: Wood heads 200: 1-wood 210, fairway woods 220, and hybrids; Iron heads 300: 1- to 9-irons 310, 320 and wedges 330; and/or putter head 400.

Abstract: A golf club includes: a shaft case being inserted into a hosel from the upper end side of a hosel hole in a head; an extending member with a lower end side which is screwed into the upper end side of the hosel hole, into which the screw member is screwed; and a pair of attachments which is fit onto the shaft and interposed between an upper end surface of the shaft case and a lower end surface of the screw member and each of which has a half-split cylindrical shape, wherein: the shaft case is fixed to the hosel hole by the screw member pressing the shaft via the attachments; and the shaft case is fixable to the hosel hole by removing the extending member and the attachments and screwing the screw member onto the upper end side of the hosel hole.

Abstract: A connector of a golf club is provided. The connector includes a shaft adapter and a hosel adapter. A compression nut fits over both adapters to secure them against one another. The hosel adapter advantageously fits over the hosel, thereby allowing the bore of the hosel to remain unmodified from its original design. The connector also includes an anti-rotation arrangement to prevent relative rotation between the shaft adapter and the hosel adapter. Further, the tip end of the club shaft passes entirely through the connector and seats within the hosel as it normally would in the absence of the connector. The connector does not surround the tip end of the shaft where it seats in the hosel, giving the club an unaltered feel, despite the inclusion of the connector.

Abstract: A ball striking device, such as a golf club head, includes a head that includes a face having an outer surface located at a front of the head, a body connected to the face and extending rearward from the face, and a face mask connected to the outer surface of the face, the face mask having a first surface configured for forming at least a portion of a ball striking surface of the head configured for striking a ball, a second surface opposite the first surface and confronting the outer surface of the face, and a plurality of elongated slots extending completely through the face mask, from the first surface to the second surface. The slots combine with the outer surface of the face to form a plurality of face grooves on the ball striking surface.

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.

Abstract: A golf club can include a universal hosel and/or hosel spacer that allows the golf club to be used with a variety of different sized club head shafts. The universal hosel can include multiple steps or ledges, and various inner diameters to accommodate different sized shafts. The spacer can be a self-expanding spacer, and can be pre-coated with epoxy. The spacer can fill in gaps within a hosel, so as to accommodate different sized shafts.

Abstract: A golf club head with an improved Moment of Inertia (MOI) is disclosed herein. More specifically, the present invention relates to a golf club head with a releasable hosel mechanism that is leaner and more lightweight, it allows a significant amount of weight to be saved from the hosel portion of the golf club head and used to improve Center of Gravity (CG) location of the golf club head; which contributes to the improvement of the MOI of the golf club head.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discrete orientations between the shaft and club head.

Abstract: Assemblies for releasably connecting a golf club head and shaft may include: (a) a shaft engaging member including a rotation-inhibiting structure having a circular cross-section and a first set of circumferentially spaced teeth; (b) a club head engaging member including a retaining structure for engaging the rotation-inhibiting structure, the retaining structure having a circular opening with a second set of circumferentially spaced teeth to engage the first set of teeth on the rotation-inhibiting structure; and (c) a securing system for releasably securing the shaft engaging member with respect to the club head engaging member. The first set of teeth may have a different number of teeth than the second set of teeth. Golf club heads are releasably engaged with shafts so that the shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed.

Abstract: A golf club incorporating an interchangeable shaft system includes a shaft, a shaft sleeve, a club head. The shaft sleeve is coupled to an end of the shaft and is received in a hosel included in the club head. The shaft sleeve is removably coupled to the club head. Hosel and shaft sleeve alignment features provide discreet orientations between the shaft and club head.

Abstract: Releasable golf club head/shaft connection systems and methods allow one to change shafts on a single club head, change club heads on a single shaft, and/or change the angular orientation features of a golf club. Such systems may include: (a) a club head body including a hosel and a locking nut stabilizer; (b) a shaft releasably engaged with the club head body, wherein an end of the shaft includes a retaining member that is inserted into the club head body; and (c) a locking nut engaged with a side surface of the club head body such that a body portion of the locking nut extends at least partially through the hosel and is supported by the locking nut stabilizer. The locking nut is movably engaged with the club head body such that it securely holds the shaft or allows the shaft to be removed therefrom.

Abstract: A golf club with an improved interchangeable hosel is disclosed herein. More specifically, the improved interchangeable hosel is independent of the golf club head as well as the shaft; and has a non-threaded connection mechanism that releasably connects the shaft to the golf club head quickly and easily. The non-threaded connection mechanism disclosed in accordance with the present invention may generally utilize a circumferentially constricting clamping force to secure the shaft of the golf club to the head of the golf club.

Abstract: The present invention is directed to a modular golf club. In particular, a golf club includes a plurality of components that are removably coupled so that the physical attributes of the golf club head may be tuned. The inventive golf club head includes a body member and at least one of a removable sole member and a removable face member.

Abstract: The present invention is directed at a quick release connection system to facilitate customization of golf clubs. It can be used to interchange soleplates quickly and easily. Teeth are disposed on the inside of a frame so that a soleplate may be inserted with minimal resistance, but cannot be removed without specific steps which may require the use of a simple tool. Strengthening and interlock devices are provided to ensure performance quality akin to traditional golf clubs.

Abstract: Golf club heads are releasably engaged with shafts so they may be readily interchanged and/or so that the shaft orientation with respect to the club head can be readily changed. Assemblies for connecting the club head and shaft may include a shaft adapter and a head adapter. The shaft adapter may have an exterior surface extending along a first axis and a bore having a cross-sectional shape along a second axis configured to attach to a shaft member. The second end of the shaft adapter has a cross-sectional shape of a regular polygon. The head adapter has a first end and a second end along a first axis and a bore having a shape of a regular polygon along a second axis that is shaped to receive the second end of the shaft adapter in a plurality of orientations.

Abstract: A variable length shaft assembly comprising at least one upper shaft portion, a lower shaft portion and a threaded fastener, wherein the threaded fastener removably connects the upper shaft portion to the lower shaft portion, is disclosed herein. The variable length shaft assembly may further comprise at least two upper shaft portions having different lengths so a golfer can adjust the total length of the shaft by removing one upper shaft portion and replacing it with another upper shaft portion having a different length. Methods of adjusting the length of a golf club shaft without damaging any portion of the shaft and variable length shaft kits are also disclosed herein.

Abstract: A variable length golf club shaft is disclosed herein. The variable length golf club shaft includes at least one upper shaft portion having a first diameter and a hollow lower shaft portion having a second diameter that is larger than the first diameter, wherein the lower shaft portion has at least one notch, and wherein the at least one upper shaft portion has at least one pin that fits within the at least one notch.

Abstract: Golf club heads are releasably engaged with shafts so that the club heads and shafts can be readily interchanged and/or so that the shaft position with respect to the club head can be readily changed. Golf clubs are provided that have spherical releasable connections between the golf club head and the golf club shaft along with head/shaft position adjusting features to allow interchange of shafts and heads and to allow modification of the head/shaft positioning properties. Assemblies for connecting the club head and shaft may include: a shaft adapter, a shaft retainer, and a hosel insert located within an interior chamber of the club head. The club head and shaft may be changed by releasing the securing system and exchanging the original parts with different parts.

Abstract: Embodiments of golf coupling mechanisms are presented herein. Other examples and related methods are also disclosed herein.

Abstract: A ball striking device, such as a golf club head, includes a head that includes a face having an outer surface located at a front of the head, a body connected to the face and extending rearward from the face, and a face mask connected to the outer surface of the face, the face mask having a first surface configured for forming at least a portion of a ball striking surface of the head configured for striking a ball, a second surface opposite the first surface and confronting the outer surface of the face, and a plurality of elongated slots extending completely through the face mask, from the first surface to the second surface. The slots combine with the outer surface of the face to form a plurality of face grooves on the ball striking surface.

Abstract: An iron-type golf club head is disclosed including a main body including a heel portion, a sole portion, a toe portion, a top-line portion, a front portion, a rear portion, and a striking face. The main body has a recessed region including a relief region in the front portion. A replaceable striking plate is inserted into the recessed region and the relief region. The replaceable striking plate includes a front surface, a first rear surface region and a second rear surface region. A threaded opening is located on the rear surface of the replaceable striking plate and receives a fastener to retain the replaceable striking plate on the front portion of the main body and within the recessed region and relief region.