Abstract: Embodiments of golf club heads comprising a club face with a variable thickness profile to increase face deflection and ball speed for a given CT are described herein. The variable thickness profile comprises a central region, the central transition, the hinge, the inner transition, and the hinge outer peak creating a variable face thickness with a topography that evokes the shape of a speaker woofer to produce non-linear bending, thereby producing greater strike face deflection and resulting ball speed for a given CT value. The variable face thickness profiles can further comprise a non-linear bending region comprising a first peak, a valley, and a second peak to non-linearly bend at other locations on the strike face thereby, producing greater strike face deflection and resulting ball speed for a given CT value.

Abstract: The invention described herein is an iron-type golf club head having a back cavity and a multi-section back cavity insert that preserves more strikeface flexibility and energy return to the golf ball. Additionally, the back cavity insert includes a damping member that mitigates undesirable vibrations produced after the golf club head impacts a golf ball. In some embodiments, the damping member includes an extension tip or arm that contacts an undercut of the golf club head.

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: Described herein is a hollow body iron-type golf club head having a sole and ballast configured to relieve stress within a forward region of the sole. In a first configuration, the golf club head comprises a ballast undercut for relieving stress. In other configurations, the ballast undercut is combined with additional stress relief features, such as a cascading sole near the face sole juncture, for further reductions to face thickness. In further configurations, the ballast defines a recess for receiving a ballast weight having a density greater than the body, thereby improving mass properties of the golf club head.

Abstract: A golf club head comprising a shaft sleeve with a shaft sleeve coupler set, a sleeve outer wall, and a cap. The shaft sleeve coupler set comprises four couplers protruding from the sleeve outer wall. Each of the four couplers comprises an arcuate surface. The golf club head comprises a hosel bore. The shaft sleeve is configured to be received by the hosel bore. The shaft sleeve and the hosel bore are non-coaxial.

Abstract: Some embodiments include club heads having reinforced club head faces. In one example, the club head comprises a variable face thickness profile with thickened and thinned regions. The face includes a thinned perimeter region positioned near a perimeter of the face, and a thickened central region positioned over a geometric center of the face. The club head further comprises a 360 undercut that extends along the entire perimeter of the face. The club head further comprises one or more reinforcement ribs to improve the frequency response during golf ball impacts. The combination of the thinned perimeter region, thickened central region, and 360 undercut reinforces the club head while permitting the face to bend. Other embodiments of related club heads and methods are also disclosed.

Abstract: Some embodiments include club heads having reinforced club head faces. In one example, the club head comprises a variable face thickness profile with thickened and thinned regions. The face includes a thinned perimeter region positioned near a perimeter of the face, and a thickened central region positioned over a geometric center of the face. The club head further comprises a 360 undercut that extends along the entire perimeter of the face. The club head further comprises one or more reinforcement ribs to improve the frequency response during golf ball impacts. The combination of the thinned perimeter region, thickened central region, and 360 undercut reinforces the club head while permitting the face to bend. Other embodiments of related club heads and methods are also disclosed.

Abstract: Described herein is a golf club head comprising reinforcement members. The reinforcement members span across a rear cavity to connect to at least two portions of the perimeter of the club head and do not touch the rear surface of the strike face. The reinforcement members can be integrally casted or separately formed and attached to the club head. The reinforcement members improve the sound and vibrational response of the club head.

Abstract: A golf club head includes a hosel and a shaft sleeve insertable into the hosel, A shaft sleeve body of the shaft sleeve, the shaft sleeve body includes an outer wall and a first coupler protruding from the sleeve outer wall and having a first coupler surface area, a second coupler protruding from the sleeve outer wall and having a second coupler surface area, a third coupler protruding from the sleeve outer wall and having a third coupler surface area, and a fourth coupler protruding from the sleeve outer wall and having a fourth coupler surface area. Each of the first second, third and fourth couplers has an arcuate surface continuously curved throughout its respective surface area.

Abstract: Described herein is a golf club head comprising reinforcement members. The reinforcement members span across a rear cavity to connect to at least two portions of the perimeter of the club head and do not touch the rear surface of the strike face. The reinforcement members can be integrally casted or separately formed and attached to the club head. The reinforcement members improve the sound and vibrational response of the club head.

Abstract: A golf club head that achieves high performance by improving and/or balancing physical properties and performance characteristics. The golf club heads described herein achieve an IYY at or near the allowable limit, an IXX/IYY ratio near 1, and a club head CG position that is centered relative to the club head perimeter and located at or near the loft-normal axis. The golf club head comprises one or more structures that create discretionary mass to be redistributed into a heavy weight member in an extreme rearward and soleward position, and/or a central mass pad at or near the Y?-axis.

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 driver-type golf club head comprising a cube-like body shape, wherein a ratio between the body height and the body depth is between 0.5 and 0.75, and a ratio between the body height and the body width is between 0.5 and 0.75. The golf club head further comprises a mass distribution wherein a large portion of the club head mass is located within a central mass zone centered about the Y?-axis. The golf club head further comprises an Ixx and an Iyy moment of inertia, wherein and Ixx/Iyy ratio is greater than 0.8. In many embodiments, the golf club head further comprises optimized bulge and roll curvatures determined by the Ixx, Iyy, CG position, coefficient of restitution, and/or other characteristics.

Abstract: A method of forming a golf club head assembly includes aligning a faceplate with a recess of a club head; welding the faceplate to the club head; then, after welding the faceplate, heating the club head and the faceplate to at least a solvus temperature of the faceplate for a predetermined amount of time; and then, after heating the club head and the faceplate, allowing the club head and the faceplate to air cool.

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: Embodiments of a stick weight assembly for use within a shaft of a golf club, wherein the shaft includes a shaft inner surface defining a shaft bore, the stick weight assembly comprising: a stick weight comprising: a rod sized for insertion into the shaft bore, the rod having a top end and a bottom end, wherein the top end defines an outer top end geometry; a disk coupled to the rod bottom end and sized to abut a tip end of the shaft; and a stick weight support comprising: a first end; a second end; a first portion having an outer surface defining a dome wherein the dome is sized for insertion into the shaft; a second portion coupled to the first portion comprises an outer surface and a plurality of ridges projecting outward from the outer surface and sized to engage the shaft inner surface; wherein the stick weight support defines a cavity extending from the second end towards the first end, wherein the cavity is configured to receive the top end of the rod.