# US 2023/0057513 A1 · Set of golf club heads and method of manufacture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0057513 A1 - Document ID: US20230057513A1 - Status: Published application - Kind: A1 - Application number: 17/981,883 - Filed: 2022-11-07 - Published: 2023-02-23 - Earliest claimed: 2011-11-28 - Assignees: Acushnet Company - Applicants: Acushnet Company - Inventors: Kevin Tassistro; Ronald K. Hettinger - Web page: https://patentgrep.com/patent/US20230057513A1 ## CPC - A63B 53/0475: {with one or more enclosed cavities} - A63B 53/047: {iron-type} - A63B 53/06: adjustable - A63B 53/08: with special arrangements for obtaining a variable impact - A63B 53/005: {Club sets} - A63B 53/0408: {characterised by specific dimensions, e.g. thickness} - A63B 53/0416: {Heads having an impact surface provided by a face insert} - A63B 53/0433: {with special sole configurations} - A63B 53/0437: {with special crown configurations} - A63B 53/0454: {Strengthening ribs on the rear surface of the impact face plate} - A63B 2053/0491: {with added weights, e.g. changeable, replaceable} - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) ## Abstract A co-forged iron type golf club is disclosed. More specifically, the present invention discloses an iron type golf club head from a pre-form billet that already contains two or more materials before the actual forging process resulting in a multi-material golf club head that doesn't require any post manufacturing operations such as machining, welding, swaging, gluing, and the like. The resultant golf club head may be capable of achieving center of gravity locations previously unachievable without utilizing this co-forging technique. The resultant golf club head may be used to create a set of golf club heads with center of gravity locations that are more advantageous throughout a set of golf clubs. ## Claims ### Claim 1 A golf club head comprising: a striking face portion located at a frontal portion of said golf club head defining a loft of said golf club head; a back portion located aft of said striking face portion; a topline located at an upper portion of said golf club head between said striking face portion and said back portion; a sole portion located at a lower portion of said golf club head between said striking face portion and said back portion, and a hosel located near a heel portion of said golf club head adapted to engage a shaft, wherein said sole portion further comprises a hollow sole cavity and a cap, wherein when said loft of said golf club head is greater than 52 degrees, said golf club head has a CG-C-SA relationship with said loft that satisfies the equation below: CG-C-SA<0.1907*Loft+11.17, said CG-C-SA defined as a distance measured in millimeters of a center of gravity of said golf club head rearward of a hosel bore axis of said golf club head along a Z-axis, wherein said hollow sole cavity further comprises a heel side cavity portion and a toe side cavity portion, wherein a weight adjustment portion is located within said toe side cavity portion of said hollow sole cavity, and wherein said heel side cavity portion is void of material. ### Claim 2 (depends on 1) The golf club head of claim 1, wherein when said loft of said golf club head is between 52 degrees and about 56 degrees, said CG-C-SA is between about 12 mm and about 13 mm. ### Claim 3 (depends on 2) The golf club head of claim 2, wherein when said loft of said golf club head is between 52 degrees and about 56 degrees, said CG-C-SA is between about 12.1 mm and about 12.9 mm. ### Claim 4 (depends on 3) The golf club head of claim 3, wherein when said loft of said golf club head is between 52 degrees and about 56 degrees, said CG-C-SA is between about 12.2 mm and about 12.8 mm. ### Claim 5 (depends on 1) The golf club head of claim 1, wherein when said loft of said golf club head is greater than about 56 degrees, said CG-C-SA is between about 13 mm and about 14 mm. ### Claim 6 (depends on 5) The golf club head of claim 5, wherein when said loft of said golf club head is greater than about 56 degrees, said CG-C-SA is between about 13.1 mm and about 13.9 mm. ### Claim 7 (depends on 6) The golf club head of claim 6, wherein when said loft of said golf club head is greater than about 56 degrees, said CG-C-SA is between about 13.2 mm and about 13.8 mm. ### Claim 8 (depends on 1) The golf club head of claim 1, wherein said golf club head has a CG-C-SA relationship with said loft that satisfies the equation below: CG-C-SA≤0.0879*Loft+11.667. ### Claim 9 (depends on 1) The golf club head of claim 1, wherein said hosel has a length of greater than about 83.5 mm. ### Claim 10 (depends on 1) The golf club head of claim 1, wherein said heel side cavity portion and said toe side cavity portion are separated by a wall. ### Claim 11 (depends on 10) The golf club head of claim 10, wherein said wall has an opening, said opening connecting said heel side cavity portion to said toe side cavity portion. ### Claim 12 A golf club head comprising: a striking face portion located at a frontal portion of said golf club head defining a loft of said golf club head; a back portion located aft of said striking face portion; a topline located at an upper portion of said golf club head between said striking face portion and said back portion; a sole portion located at a lower portion of said golf club head between said striking face portion and said back portion, and a hosel located near a heel portion of said golf club head adapted to engage a shaft, wherein said sole portion further comprises a hollow sole cavity and a cap, wherein when said loft of said golf club head is greater than 52 degrees, said golf club head has a CG-C-SA relationship with said loft that satisfies the equation below: CG-C-SA<0.1907*Loft+11.17, said CG-C-SA defined as a distance measured in millimeters of a center of gravity of said golf club head rearward of a hosel bore axis of said golf club head along a Z-axis, wherein said hollow sole cavity further comprises a heel side cavity portion and a toe side cavity portion separated by a wall, wherein a weight adjustment portion is located within said toe side cavity portion of said hollow sole cavity, and wherein said heel side cavity portion has a volume greater than said toe side cavity portion. ### Claim 13 (depends on 12) The golf club head of claim 12, wherein when said loft of said golf club head is between 52 degrees and about 56 degrees, said CG-C-SA is between about 12 mm and about 13 mm. ### Claim 14 (depends on 13) The golf club head of claim 13, wherein when said loft of said golf club head is greater than about 56 degrees, said CG-C-SA is between about 13 mm and about 14 mm. ### Claim 15 (depends on 14) The golf club head of claim 14, wherein said golf club head has a CG-C-SA relationship with said loft that satisfies the equation below: CG-C-SA≤0.0879*Loft+11.667. ### Claim 16 (depends on 15) The golf club head of claim 15, wherein said cap completely covers both said heel side cavity portion and said toe side cavity portion. ### Claim 17 (depends on 16) The golf club head of claim 16, wherein said heel side cavity portion is void of material. ### Claim 18 (depends on 17) The golf club head of claim 17, wherein said weight adjustment portion does not contact said heel side cavity portion. ### Claim 19 (depends on 18) The golf club head of claim 18, wherein said heel side cavity portion and said toe side cavity portion are separated by a wall. ### Claim 20 (depends on 19) The golf club head of claim 19, wherein said hosel has a length of greater than about 83.5 mm.