IP Library › Granted Patent US 12,508,477
Granted Patent B2
US 12,508,477 · App. 18/155,620 · Granted Dec 30, 2025

Golf club heads with golf coupling mechanisms

Inventors: Evan R. Greer (Phoenix, AZ); Jacob T. Clarke (Apex, NC); Eric J. Morales (Laveen, AZ); Ryan M. Stokke (Anthem, AZ); Eric V. Cole (Phoenix, AZ); David S. Kultala (Phoenix, AZ)
Assignee: Karsten Manufacturing Corporation
A63B53/02A63B53/0466A63B53/023Y10T29/49826
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Quick Facts
Patent No.
US 12,508,477
App. No.
18/155,620
Granted
Dec 30, 2025
Kind
B2
Abstract

Embodiments of golf coupling mechanisms for joining golf club heads and shafts are described herein. The golf coupling mechanism allows for adjustment of a club head loft angle, a club head lie angle, and a golf club shaft length while utilizing one club head and one shaft. In a fully extended configuration, the golf coupling mechanism includes a shaft sleeve, a removable spacer, and a removable extender, wherein a fastening assembly secures the golf coupling mechanism to the golf club head. In a contracted configuration, the golf coupling mechanism includes the shaft sleeve. The golf coupling mechanism further includes a shaft cap to soften the interaction between the shaft and the golf coupling mechanism. The golf coupling mechanism further comprises one or more arcuate coupler sets to frictionally lock the shaft relative to the golf club head.

Claims (31)

1 . A golf club coupling mechanism configured for joining an iron-type club head and a golf club shaft, the golf club coupling mechanism comprising:

a shaft sleeve having a sleeve bore configured to receive an end of the golf club shaft; the shaft sleeve comprising:

a top section;

a bottom section; and

a sleeve coupler set having a plurality of sleeve couplers protruding from an outer surface of the top section; the sleeve coupler set comprising:

a first coupler having an arcuate surface curved throughout the first coupler;

a second coupler having an arcuate surface curved throughout the second coupler;

a third coupler having an arcuate surface curved throughout the third coupler; and

a fourth coupler having an arcuate surface curved throughout the fourth coupler;

a shaft cap configured to be inserted into the sleeve bore;

a removable spacer configured to couple with the top section of the shaft sleeve; and

a removable extender configured to couple with the bottom section of the shaft sleeve;

wherein the removable extender is non-threadably secured to the shaft sleeve.

2 . The golf club coupling mechanism of claim 1 , wherein:

the sleeve coupler set of the shaft sleeve further comprises:

a fifth coupler having an arcuate surface curved throughout the fifth coupler;

a sixth coupler having an arcuate surface curved throughout the sixth coupler;

a seventh coupler having an arcuate surface curved throughout the seventh coupler; and

an eighth coupler having an arcuate surface curved throughout the eighth coupler.

3 . The golf club coupling mechanism of claim 1 , wherein:

the removable spacer further comprises a receiver coupler set having a plurality of receiver couplers; and

the sleeve coupler set of the shaft sleeve is configured to sit against the receiver coupler set of the removable spacer to restrict a rotation of the shaft sleeve relative to the removable spacer.

4 . The golf club coupling mechanism of claim 1 , wherein the removable spacer further comprises a spacer coupler set protruding from an outer surface of the removable spacer.

5 . The golf club coupling mechanism of claim 1 , wherein the shaft sleeve further comprises locking channels located at the bottom section of the shaft sleeve.

6 . The golf club coupling mechanism of claim 5 , wherein:

the removable extender comprises a first engagement member and a second engagement member; and

the first and second engagement members of the removable extender are configured to couple with the locking channels of the shaft sleeve to restrict rotation of the removable extender relative to the shaft sleeve.

7 . The golf club coupling mechanism of claim 1 , wherein the shaft cap comprises a plurality of protrusions protruding from an internal surface of the shaft cap; wherein the plurality of protrusions of the shaft cap are configured to center the golf club shaft within the shaft sleeve.

8 . The golf club coupling mechanism of claim 1 , wherein the shaft cap is configured to elastically compress to be secured within the shaft sleeve.

9 . The golf club coupling mechanism of claim 1 , wherein the sleeve coupler set is asymmetric about an outer surface of the shaft sleeve such that one or more sleeve couplers of the plurality of sleeve couplers are longer in length at a first area of the shaft sleeve than a second area of the shaft sleeve.

10 . The golf club coupling mechanism of claim 1 , wherein the removable spacer and the removable extender is formed from aluminum alloy.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 1, 2023
From: GREER, EVAN R.; CLARKE, JACOB T.; MORALES, ERIC J.; STOKKE, RYAN M.; COLE, ERIC V.; KULTALA, DAVID S.
To: KARSTEN MANUFACTURING CORPORATION
Reel/Frame 064456/0974 →
Continuity (22)
Division 16945577 · Jul 31, 2020
Continuation In Part 16523839 · Jul 26, 2019
Continuation 15831515 · Dec 5, 2017
Continuation 15003494 · Jan 21, 2016
Continuation In Part 14282786 · May 20, 2014
Continuation In Part 13795653 · Mar 12, 2013
Continuation In Part 13735123 · Jan 7, 2013
Continuation In Part 13468663 · May 10, 2012
Continuation In Part 13468675 · May 10, 2012
Continuation In Part 13468675 · May 10, 2012
Continuation In Part 13468663 · May 10, 2012
Continuation In Part 13468677 · May 10, 2012
Continuation In Part 13429319 · Mar 24, 2012
Continuation In Part 13429319 · Mar 24, 2012
Continuation 13429319 · Mar 24, 2012
Continuation In Part 13429319 · Mar 24, 2012
Provisional Application 62881271 · Jul 31, 2019
Provisional Application 62254081 · Nov 11, 2015
Provisional Application 62107240 · Jan 23, 2015
Provisional Application 61590232 · Jan 24, 2012
Provisional Application 61529880 · Aug 31, 2011
Related Publication 20230149781A1 · May 18, 2023
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