# US 2021/0275879 A1 · Golf club heads with hosel inserts and related methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0275879 A1 - Document ID: US20210275879A1 - Status: Published application - Kind: A1 - Application number: 17/330,309 - Filed: 2021-05-25 - Published: 2021-09-09 - Earliest claimed: 2011-08-31 - Assignees: Karsten Manufacturing Corporation - Applicants: Karsten Manufacturing Corporation - Inventors: Jacob T. Clarke; Eric J. Morales; Ryan M. Stokke; Evan R. Greer; Eric V. Cole; David S. Kultala - Web page: https://patentgrep.com/patent/US20210275879A1 ## CPC - A63B 53/02: Joint structures between the head and the shaft - A63B 53/0466: {wood-type} - A63B 53/023: {adjustable angular orientation} - Y10T 29/49826: Assembling or joining - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Embodiments of golf coupling mechanisms are presented herein. Other examples and related methods are also disclosed herein. ## Claims ### Claim 1 A golf club head comprising: a club head body comprising: a sole portion comprising a sole bottom end, a top portion opposite the sole portion, a heel portion, a toe portion opposite the heel portion, a rear portion, a front portion opposite the rear portion, the front portion comprising a strike face; and a hosel; a shaft sleeve insertable into the hosel and configured to couple a golf club shaft with the hosel; and a securing fastener configured to couple to a sleeve bottom end of the shaft sleeve to secure the shaft sleeve in the hosel: wherein: the hosel comprises a hosel bore configured to receive the shaft sleeve; the shaft sleeve comprises: a shaft bore configured to receive an end of the golf club shaft; a shaft sleeve body comprising a sleeve outer wall; a shaft sleeve cap configured to be coupled with the sleeve body; a sleeve top end; a sleeve bottom end; a sleeve axis extending longitudinally between the sleeve top end and sleeve bottom end; the shaft sleeve body further comprising: a first coupler protruding from the sleeve outer wall; a second coupler protruding from the sleeve outer wall; a third coupler protruding from the sleeve outer wall; and a fourth coupler protruding from the sleeve outer wall; the first coupler comprising a first arcuate surface curved throughout, the first coupler; the second coupler comprising a second arcuate surface curved throughout the second coupler; the third coupler comprising a third arcuate surface curved throughout the third coupler; the fourth coupler comprising a fourth arcuate surface curved throughout the fourth coupler; the shaft bore further comprising a shaft bore axis; wherein the shaft sleeve outer wall and shaft bore are non-coaxial. ### Claim 2 (depends on 2) The golf club head of claim 2, wherein the shaft bore axis and sleeve axis define a loft angle and a lie angle therebetween. ### Claim 3 (depends on 2) The golf club head of claim 2, wherein: a first coupler position defines a first loft angle and a first lie angle between the shaft bore axis and the shaft receiver; a second coupler position defines a second loft angle and a second lie angle between the shaft bore axis and the shaft receiver; a third coupler position defines a third loft angle and a third lie angle between the shaft bore axis and the shaft receiver; a fourth coupler position defines a fourth loft, angle and a fourth lie angle between the shaft bore axis and the shaft receiver. ### Claim 4 (depends on 4) The golf club head of claim 4, wherein: the first coupler position is configured to reduce the first lie angle between 0.2 degrees and 4 degrees. ### Claim 5 (depends on 3) The golf club head of claim 3, wherein: the second coupler position is configured to increase the second lie angle between 0.2 degrees and 4 degrees. ### Claim 6 (depends on 3) The golf club head of claim 3, wherein: the third coupler position is configured to reduce the third loft angle between 0.2 degrees and 4 degrees. ### Claim 7 (depends on 3) The golf club head of claim 3, wherein: the fourth coupler position is configured to increase the fourth loft angle between 0.2 degrees and four degrees. ### Claim 8 (depends on 4) The golf club head of claim 4, wherein the first loft angle remains in a neutral orientation. ### Claim 9 (depends on 5) The golf club head of claim 5, wherein the second loft angle remains in a neutral orientation. ### Claim 10 (depends on 6) The golf club head of claim 6, wherein the third lie angle remains in a neutral orientation. ### Claim 11 (depends on 7) The golf club head of claim 7, wherein the fourth lie angle remains in a neutral orientation. ### Claim 12 (depends on 1) The golf club head of claim 1, wherein: the shaft sleeve further comprises a fifth coupler protruding from the sleeve outer wall and comprising a fifth arcuate surface curved throughout the fifth coupler; and a sixth coupler protruding from the sleeve outer wall and comprising a sixth arcuate surface curved throughout the sixth coupler. ### Claim 13 A golf club head comprising: a club head body comprising: a sole portion comprising a sole bottom end, a top portion opposite the sole portion, a heel portion, a toe portion opposite the heel portion, a rear portion, a front portion opposite the rear portion, the front portion comprising a strike face; a hosel; and a golf coupling mechanism comprising: a shaft sleeve configured to be coupled to an end of the golf club shaft and a hosel; a shaft receiver of the golf club head configured to receive the shaft sleeve; wherein: the shaft sleeve comprises: a shaft bore configured to receive the end of the golf club shaft; a shaft sleeve body comprising a sleeve outer wall; a shaft sleeve cap configured to be coupled with the shaft sleeve; a top end; a bottom end; a sleeve axis extending longitudinally between the sleeve top end and sleeve bottom end; a coupler set comprising: a first coupler protruding from the sleeve outer wall; a second coupler protruding from the sleeve outer wall; a third coupler protruding from the sleeve outer wall; and a fourth coupler protruding from the sleeve outer wall; wherein: the shaft bore comprises a shaft bore axis; the first coupler comprises a first arcuate surface curved throughout the first coupler; the second coupler comprises a second arcuate surface curved throughout the second coupler; the third coupler comprises a third arcuate surface curved throughout, the third coupler; the fourth coupler comprises a fourth arcuate surface curved throughout the fourth coupler; and the shaft receiver comprises: a fifth coupler indented into the receiver inner wall; a sixth coupler indented into the receiver inner wall; a seventh coupler indented into the receiver inner wall; and an eighth coupler indented into the receiver inner wall; the fifth coupler comprises a fifth arcuate surface curved throughout the fifth coupler; the sixth coupler comprises a sixth arcuate surface curved throughout the sixth coupler; the seventh coupler comprises a seventh arcuate surface curved throughout the seventh coupler; the eighth coupler comprises an eighth arcuate surface curved throughout the eighth coupler; and wherein the shaft sleeve outer wall and shaft bore are non-coaxial.