Abstract: A golf club has a first shaft coupled to a club head, a second shaft configured to slidably engage a portion of the first shaft, a grip coupled to the second shaft, and an adjustable length shaft assembly received by the second shaft and configured to allow a portion of the first shaft to slide in relation to the second shaft in a first configuration, and to restrict a portion of the first shaft from sliding in relation to the second shaft in a second configuration. The grip is restricted from rotation about the first shaft or the second shaft as the first shaft slides in relation to the second shaft.

Abstract: A pocket-sized, retractable golf club stand that can hold one or more golf clubs is described. The golf club stand includes a magnetic club holder that is attached to a telescoping shaft which is attached to a base including a slidable anchor. During use the anchor is extended and embedded into the ground, the telescoping pole is extended, and clubs are held against the device by the magnetic holder. Upon completion of use, the clubs are removed from the magnetic holder, the telescoping pole is retracted, and the anchor is slidably hidden away. In addition to holding golf clubs the device's anchor may be used for divot repair and the magnetic club holder may be used to secure ball markers.

Abstract: A ball bat includes a barrel portion, a handle portion, and a joint connecting the handle portion to the barrel portion. In some embodiments, the joint includes a releasable connector configured to releasably connect the barrel portion to the handle portion. In some embodiments, the joint includes two releasable connectors to releasably connect the barrel portion to the handle portion. The ball bat may include a flexible rod element positioned between the two releasable connectors. The rod element may include an elastomeric material. In some embodiments, the ball bat may further include a safety connector between the barrel portion and the handle portion or a releasable connector may include a threaded connection to resist release of the releasable connector. In some embodiments, the joint may include a rotatable element for adjusting flex.

Abstract: A golf club shaft system and golf club shaft possessing unique flexural and torsional rigidity profiles, while providing significant adjustability to fine tune the shaft to a particular golf swing.

Abstract: A golf swing exercise machine allows a player to develop their golf swing by forcing the head of an adapted golf club to follow a preferred wing path. The path is marked by a rail. The rail is held by a rail support that is oriented with respect to the ground by a frame. The frame is made up of a base with side, front and back support members and horizontal supports. The golf club head has slots to allow the head to follow the rail.

Abstract: Disclosed herein is a grip comprising an internal bore with an opening having an internal tapered edge. The grip can engage with a tool or a piece of sports equipment. Further disclosed herein is a method of installing a grip onto a tool or piece of sports equipment, including providing a grip having a tubular body; grinding an open first end of the body, wherein the open first end comprises a greatest diameter closest to the exterior of the bore and tapers internally at an angle towards the interior of the bore; providing a shaft or handle; applying an adhesive to a top portion of the handle; sliding the handle into the grip bore until the shaft contacts the a capped second end of the grip; and coupling a surface of the bore to the handle by allowing the adhesive to dry.

Abstract: A collapsible arrow having an outer shaft. An inner shaft is preferably in slidable contact with the outer shaft in order to aid longitudinal stability. In order to be shot with a bow, the inner shaft can be extended from the outer shaft; to be stored, the inner shaft can be retracted into the outer shaft. A locking mechanism having minimal aerodynamic impact holds the inner shaft in its maximum extend position for shooting and flight. Preferably, traditional aerodynamic stabilizers are located on the outer surface of the aft section of the inner shaft.

Abstract: A golf club length adjustment device for use in a golf club, comprising a first member affixed to a main shaft, said main shaft configured to couple to a golf club head, a second member slideably coupled to said first member, said second member adapted to couple to a golf club grip, said golf club grip including an internal cavity configured to receive a golf club shaft, wherein said first member is configured to slide relative to said second member to change the length of said golf club, wherein said first member and said second member are configured to limit rotation of said first member relative to said second member, a locking system configured to selectively limit said first member from sliding relative to said second member, wherein said locking system comprises a locked position and an unlocked position.

Abstract: A variable length shaft assembly comprising a shaft, a shaft adapter, a grip sleeve, an actuator screw, a grip, and a screw is disclosed herein. The grip is bonded to the grip sleeve, the shaft adapter is bonded to the shaft, and the shaft adapter comprises a keyed portion that mates with a keyed structure inside of the grip sleeve. The actuator screw comprises external threads that mate with internal threads inside the grip sleeve, and the location of the actuator screw within the grip sleeve can be adjusted with a wrench. Once the actuator screw is at a desired location within the grip sleeve, the shaft is semi-permanently fixed to the grip sleeve by releasably affixing the keyed structure of the shaft adapter to the actuator screw with the screw. The overall length of the assembly can be adjusted and fine-tuned using these structures.

Abstract: A device designed for modifying the length of a golf club shaft. The device is a three-piece mechanism with a bottom part bonded into the top end of a tubular golf club shaft, a top part provided within the grip, a threaded screw provided within the top part and threadably connected to the bottom part such that movement of the screw will adjust the distance between the top part and bottom part thereby adjusting the club length. The extension device is hidden within the shaft and grip and does not require a custom grip or shaft.

Abstract: A golf club length adjustment device for use in a golf club, comprising a first member affixed to a main shaft, said main shaft configured to couple to a golf club head, a second member slideably coupled to said first member, said second member adapted to couple to a golf club grip, said golf club grip including an internal cavity configured to receive a golf club shaft, wherein said first member is configured to slide relative to said second member to change the length of said golf club, wherein said first member and said second member are configured to limit rotation of said first member relative to said second member, a locking system configured to selectively limit said first member from sliding relative to said second member, wherein said locking system comprises a locked position and an unlocked position.

Abstract: An adjustable length golf club shaft having a grip portion with an end point is disclosed. A locking element is located within the grip portion and a lower shaft having an inner surface that is in frictional contact with the locking element is also disclosed. The locking element is configured to engage the inner surface of the lower shaft. A total length of the golf club shaft is adjustable by a distance of at least one inch and a total weight of the golf club shaft in a weight zone is less than 110 g. The weight zone is defined as a region of the golf club shaft extending from the end point of the grip portion up to 11? along a central axis of the golf club shaft toward a tip portion of the shaft.

Abstract: According to an aspect of this invention, a golf club includes: a shaft; a head attached to a distal end of the shaft; a substantially cylindrical shaft case is secured to the distal end of the shaft; the shaft case is inserted into a hosel hole in the head; and the shaft case is fixed to the head by a bolt which is inserted from a sole side of the head, wherein: a stopper member is attached to an outer circumference of the shaft case so that an attaching position can be changed; the stopper member is in abutment with an upper end portion of a hosel; and an inserting depth of the shaft case into the hosel hole can be changed by changing the attaching position of the stopper member.

Abstract: A golf club shaft swing training and practice device to impart axial rotation to the user's hand during the length of the stroke by utilizing a fixed upper handgrip and a movable lower handgrip on a support rod. The upper handgrip is fixed on the rod and the lower handgrip is slidably disposed along the rod which is cross-sectionally square with a longitudinal spiral twisted surface to impart lower grip axial rotation as it is moved therealong in increasing distance from the fixed upper handgrip during a practice swing.

Abstract: Embodiments of adjustable length golf clubs and methods of manufacturing adjustable length golf clubs are generally described herein. Other embodiments may be described and claimed.

Abstract: An adjustable length golf club shaft having a grip portion with an end point is disclosed. A locking element is located within the grip portion and a lower shaft having an inner surface that is in frictional contact with the locking element is also disclosed. The locking element is configured to engage the inner surface of the lower shaft. A total length of the golf club shaft is adjustable by a distance of at least one inch and a total weight of the golf club shaft in a weight zone is less than 110 g. The weight zone is defined as a region of the golf club shaft extending from the end point of the grip portion up to 11? along a central axis of the golf club shaft toward a tip portion of the shaft.

Abstract: A variable length shaft assembly comprising a shaft, a shaft adapter, a grip sleeve, an actuator screw, a grip, and a screw is disclosed herein. The grip is bonded to the grip sleeve, the shaft adapter is bonded to the shaft, and the shaft adapter comprises a keyed portion that mates with a keyed structure inside of the grip sleeve. The actuator screw comprises external threads that mate with internal threads inside the grip sleeve, and the location of the actuator screw within the grip sleeve can be adjusted with a wrench. Once the actuator screw is at a desired location within the grip sleeve, the shaft is semi-permanently fixed to the grip sleeve by releasably affixing the keyed structure of the shaft adapter to the actuator screw with the screw. The overall length of the assembly can be adjusted and fine-tuned using these structures.

Abstract: A variable length shaft assembly comprising at least one spacer, a shaft portion, and a threaded fastener, wherein the threaded fastener removably connects the spacer to the lower shaft, is disclosed herein. The variable length shaft assembly may further comprise at least two spacers that are stackable on a butt end of the shaft portion so a golfer can adjust the total length of the shaft. 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 lightweight grip assembly is disclosed herein. The lightweight grip assembly comprises a rigid support structure comprising a hollow portion and a grip portion comprising a substantially uniform thickness, wherein the grip portion is disposed on an external surface of the rigid support structure. The lightweight grip assembly may be used in connection with golf club shafts and heads having one or more adjustable features to increase the amount of overall discretionary weight available to a golfer.

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: 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 shaft assembly comprising a shaft, a shaft adapter, a grip sleeve, an actuator screw, a grip, and a screw is disclosed herein. The grip is bonded to the grip sleeve, the shaft adapter is bonded to the shaft, and the shaft adapter comprises a keyed portion that mates with a keyed structure inside of the grip sleeve. The actuator screw comprises external threads that mate with internal threads inside the grip sleeve, and the location of the actuator screw within the grip sleeve can be adjusted with a wrench. Once the actuator screw is at a desired location within the grip sleeve, the shaft is semi-permanently fixed to the grip sleeve by releasable affixing the keyed structure of the shaft adapter to the actuator screw with the screw. The overall length of the assembly can be adjusted and fine-tuned using these structures.

Abstract: A variable length shaft assembly comprising at least one spacer, a shaft portion, and a threaded fastener, wherein the threaded fastener removably connects the spacer to the lower shaft, is disclosed herein. The variable length shaft assembly may further comprise at least two spacers that are stackable on a butt end of the shaft portion so a golfer can adjust the total length of the shaft. 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 comprises a front portion, a rear portion, a toe portion and a heel portion that together form a two-piece body and for which a center of gravity is defined. The body comprises a central portion as a first piece and a frame as a second piece. The frame encloses a substantial portion of the central portion within an XY-plane. The central portion is connected with the frame with fasteners along at least the front portion. The moment inertia of the club head about a z-axis of the center of gravity is between about 7,000 kg·mm2 and about 14,000 kg·mm2.

Abstract: An adjustable length golf club including an engaging mechanism, a rotational shaft, a locking mechanism, and a lower shaft. The rotational shaft is connected with the engaging mechanism and is configured to rotate upon movement by the engaging mechanism. The locking mechanism is connected with the rotational shaft and includes a locking insert and a locking collar located on the locking insert. The locking insert being is configured to retain the locking collar during axial movement. The lower shaft has an inner surface that is in frictional contact with the locking collar. The locking insert is threadingly engaged with the locking collar and a first rotational movement in a first rotational direction by the rotational shaft causes the locking insert to move the locking collar creating a frictional locking engagement between the locking collar and the inner surface of the lower shaft.

Abstract: A variable length golf club shaft is disclosed herein. The variable length shaft includes a hollow lower shaft with a plurality of holes, a hollow upper shaft with at least one protrusion extending from an inner surface that is sized to fit within the plurality of holes, and an unlocking bar. The shaft length can be adjusted by sliding the upper shaft over the lower shaft and using the unlocking bar to release the protrusion from the holes to allow overall shaft length adjustments. in another embodiment, the variable length shaft includes a hollow lower shaft, a hollow upper shaft, an engaging insert, and a locking bar.

Abstract: An adjustable length golf club shaft having a grip portion with an end point is disclosed. A locking element is located within the grip portion and a lower shaft having an inner surface that is in frictional contact with the locking element is also disclosed. The locking element is configured to engage the inner surface of the lower shaft. A total length of the golf club shaft is adjustable by a distance of at least one inch and a total weight of the golf club shaft in a weight zone is less than 110 g. The weight zone is defined as a region of the golf club shaft extending from the end point of the grip portion up to 11? along a central axis of the golf club shaft toward a tip portion of the shaft.

Abstract: A device designed for extending a golf club shaft. The device is a three-piece mechanism with a bottom piece bonded into the top end of a tubular golf club shaft, and a plurality of top piece sizes that are connected to the bottom piece and provide a plurality of club lengths. A special golf grip having an accordion like plurality of rings can expand or contract in accordance with the amount of club length adjustment.

Abstract: A variable length shaft assembly comprising a shaft, a shaft adapter, a grip sleeve, an actuator screw, a grip, and a screw is disclosed herein. The grip is bonded to the grip sleeve, the shaft adapter is bonded to the shaft, and the shaft adapter comprises a keyed portion that mates with a keyed structure inside of the grip sleeve. The actuator screw comprises external threads that mate with internal threads inside the grip sleeve, and the location of the actuator screw within the grip sleeve can be adjusted with a wrench. Once the actuator screw is at a desired location within the grip sleeve, the shaft is semi-permanently fixed to the grip sleeve by releasable affixing the keyed structure of the shaft adapter to the actuator screw with the screw. The overall length of the assembly can be adjusted and fine-tuned using these structures.

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: A variable length golf club shaft is disclosed herein. The variable length shaft includes a hollow lower shaft with a plurality of holes, a hollow upper shaft with at least one protrusion extending from an inner surface that is sized to fit within the plurality of holes, and an unlocking bar. The shaft length can be adjusted by sliding the upper shaft over the lower shaft and using the unlocking bar to release the protrusion from the holes to allow overall shaft length adjustments. In another embodiment, the variable length shaft includes a hollow lower shaft, a hollow upper shaft, an engaging insert, and a locking bar.

Abstract: A device designed for modifying the length of a golf club shaft. The device is a three-piece mechanism with a bottom part bonded into the top end of a tubular golf club shaft, a top part provided within the grip, a threaded screw provided within the top part and threadably connected to the bottom part such that movement of the screw will adjust the distance between the top part and bottom part thereby adjusting the club length. The extension device is hidden within the shaft and grip and does not require a custom grip or shaft.

Abstract: A lightweight grip assembly is disclosed herein. The lightweight grip assembly comprises a rigid support structure comprising a hollow portion and a grip portion comprising a substantially uniform thickness, wherein the grip portion is disposed on an external surface of the rigid support structure. The lightweight grip assembly may be used in connection with golf club shafts and heads having one or more adjustable features to increase the amount of overall discretionary weight available to a golfer.

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: An adjustable length golf club shaft having a grip portion with an end point is disclosed. A locking element is located within the grip portion and a lower shaft having an inner surface that is in frictional contact with the locking element is also disclosed. The locking element is configured to engage the inner surface of the lower shaft. A total length of the golf club shaft is adjustable by a distance of at least one inch and a total weight of the golf club shaft in a weight zone is less than 110 g. The weight zone is defined as a region of the golf club shaft extending from the end point of the grip portion up to 11? along a central axis of the golf club shaft toward a tip portion of the shaft.

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: Embodiments of adjustable length golf clubs and methods of manufacturing adjustable length golf clubs are generally described herein. Other embodiments may be described and claimed.

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 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: Embodiments of adjustable length golf clubs and methods of manufacturing adjustable length golf clubs are generally described herein. Other embodiments may be described and claimed.

Abstract: An adjustable length golf club shaft having a grip portion with an end point is disclosed. A locking element is located within the grip portion and a lower shaft having an inner surface that is in frictional contact with the locking element is also disclosed. The locking element is configured to engage the inner surface of the lower shaft. A total length of the golf club shaft is adjustable by a distance of at least one inch and a total weight of the golf club shaft in a weight zone is less than 110 g. The weight zone is defined as a region of the golf club shaft extending from the end point of the grip portion up to 11? along a central axis of the golf club shaft toward a tip portion of the shaft.

Abstract: The present invention is directed to a shaft lengthening system for a golf club. The shaft lengthening system comprises three components: an upper shaft portion that is attached to a grip, a lower shaft portion or portions that are attached to a club head, and a collet clamp assembly that couples the upper and lower shaft components together. The shaft components slideably engage with each other. The collet clamp assembly may comprise a collet secured to one of the shaft components and a collet clamp that interacts with the collet. Preferably, the collet clamp is threaded over the collet to clamp a portion of the collet to the other of the shaft components thereby setting the position of the shaft components relative to each other, and thus setting the overall length of the golf club shaft.

Abstract: A variable length shaft assembly comprising a shaft adapter, a grip support, and an engagement device is disclosed herein. The variable length shaft assembly of the present invention allows a golfer to quickly, semi-permanently, and inexpensively change the overall length of the shaft assembly, such that the shaft performs as desired and conforms to USGA rules. The variable length shaft assembly of the invention may further a travel limiter to prevent parts of the shaft assembly from disengaging from each other. Methods of adjusting the length of a golf club shaft without damaging any portion of the shaft 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: 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: Embodiments of adjustable length golf clubs and methods of manufacturing adjustable length golf clubs are generally described herein. Other embodiments may be described and claimed.

Abstract: A variable length shaft assembly comprising a shaft adapter, a grip support, and an engagement device is disclosed herein. The variable length shaft assembly of the present invention allows a golfer to quickly, semi-permanently, and inexpensively change the overall length of the shaft assembly, such that the shaft performs as desired and conforms to USGA rules. The variable length shaft assembly of the invention may further a travel limiter to prevent parts of the shaft assembly from disengaging from each other. Methods of adjusting the length of a golf club shaft without damaging any portion of the shaft are also disclosed herein.

Abstract: A device designed for extending a golf club shaft. The device is a three-piece mechanism with a bottom piece bonded into the top end of a tubular golf club shaft, and a plurality of top piece sizes that are connected to the bottom piece and provide a plurality of club lengths. A special golf grip having an accordion like plurality of rings can expand or contract in accordance with the amount of club length adjustment.

Abstract: Embodiments of adjustable length golf clubs and methods of manufacturing adjustable length golf clubs are generally described herein. Other embodiments may be described and claimed.

Abstract: Embodiments of adjustable length golf clubs and methods of manufacturing adjustable length golf clubs are generally described herein. Other embodiments may be described and claimed.