# US 10,765,920 B2 · Iron-type golf clubs and golf club heads > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,765,920 B2 - Document ID: US10765920B2 - Status: Granted - Kind: B2 - Application number: 16/034,256 - Filed: 2018-07-12 - Published: 2018-11-08 - Granted: 2020-09-08 - Earliest claimed: 2015-05-28 - Assignees: Karsten Manufacturing Corporation - Applicants: Karsten Manufacturing Corporation - Inventors: Raymond J. Sander - Web page: https://patentgrep.com/patent/US10765920B2 ## CPC - A63B 53/047: {iron-type} - A63B 53/08: with special arrangements for obtaining a variable impact - A63B 53/0416: {Heads having an impact surface provided by a face insert} - A63B 53/0454: {Strengthening ribs on the rear surface of the impact face plate} - A63B 53/0458: {with non-uniform thickness 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 An iron-type golf club head includes a ball striking face and a rear weight member that are engaged through one or more resilient members with a connection structure that creates a mass-damping effect at impact with a golf ball. ## Claims ### Claim 1 An iron-type golf club head, comprising: a ball striking face member including a rear surface and a ball striking face; a rear weight member including a front surface, at least one resilient member between the front surface of the rear weight member and the rear surface of the ball striking face member, wherein the front surface of the rear weight member and the rear surface of the ball striking face member face one another and define a space therebetween; wherein the at least one resilient member is disposed within the space, wherein the ball striking face member comprises a first material having a first hardness, wherein the rear weight member comprises a second member having a second hardness, and wherein the at least one resilient member comprises at least a third hardness, wherein no portion of the at least one resilient member comprises a hardness greater than any portion of the ball striking face member or rear weight member; wherein the hardness of the at least one resilient member is varied; wherein the rear surface of the ball striking face member comprises an engagement member, wherein the engagement member comprises a raised rib element formed as part of the ball striking face member, wherein the raised rib element projects rearward from the rear surface of the ball striking face member, wherein the raised rib element extends from a toe portion of the ball striking face member to a heel portion of the ball striking face member, wherein the at least one rear weight member and varied hardness of the at least one resilient member are configured to receive transferred energy from impact between the face member and a ball, and to selectively limit compressibility of the space between the ball striking face member and the rear weight member and divide the space into: (a) an area of low compressibility located above the raised rib element, and (b) an area of high compressibility located below the raised rib element, wherein the raised rib element is arranged with respect to a center of gravity of the golf club head such that the raised rib element passes through the center of gravity of the iron type golf club head. ### Claim 2 (depends on 1) The iron type golf club head of claim 1, wherein the at least one resilient member is in contact with both the rear surface of the ball striking face member and the front surface of the rear weight member. ### Claim 3 (depends on 1) The iron type golf club head of claim 1, wherein the rear weight member comprises a rear perimeter weight, wherein the rear perimeter weight at least in part defines a rear cavity area. ### Claim 4 (depends on 1) The iron type golf club head of claim 1, wherein the ball striking face member further comprises a hosel integrally formed with ball striking face member. ### Claim 5 (depends on 1) The iron type golf club head of claim 1, wherein the raised rib element comprises a half-cylinder shape, wherein the raised rib element comprises a half circle cross section. ### Claim 6 (depends on 5) The iron type golf club head of claim 5, wherein the at least one resilient member comprises a half-cylinder recess configured to receive the raised rib element. ### Claim 7 (depends on 1) The iron type golf club head of claim 1, wherein the raised rib element comprises a triangular cross sectional shape, wherein a triangular peak of the raised rib element is oriented toward the rear weight member. ### Claim 8 (depends on 7) The iron type golf club head of claim 7, wherein the at least one resilient member comprises a triangular cross sectional recess configured to receive the raised rib element. ### Claim 9 An iron-type golf club head, comprising: a ball striking face member including a rear surface and a ball striking face; a rear weight member including a front surface, at least one resilient member between the front surface of the rear weight member and the rear surface of the ball striking face member, wherein the front surface of the rear weight member and the rear surface of the ball striking face member face one another and define a space therebetween; wherein the at least one resilient member is disposed within the space, wherein the ball striking face member comprises a first material having a first hardness, wherein the rear weight member comprises a second member having a second hardness, and wherein the at least one resilient member comprises at least a third hardness, wherein no portion of the at least one resilient member comprises a hardness greater than any portion of the ball striking face member or rear weight member; wherein the hardness of the at least one resilient member is varied; wherein the rear surface of the ball striking face member comprises an engagement member, wherein the engagement member comprises a raised rib element formed as part of the ball striking face member, wherein the raised rib element projects rearward from the rear surface of the ball striking face member, wherein the raised rib element extends from a toe portion of the ball striking face member to a heel portion of the ball striking face member, wherein the at least one rear weight member and varied hardness of the at least one resilient member are configured to receive transferred energy from impact between the face member and a ball, and to selectively limit compressibility of the space between the ball striking face member and the rear weight member and divide the space into: (a) an area of low compressibility located below the raised rib element, and (b) an area of high compressibility located above the raised rib element, wherein the raised rib element is arranged with respect to a center of gravity of the golf club head such that the raised rib element passes through the center of gravity of the iron type golf club head. ### Claim 10 (depends on 9) The iron type golf club head of claim 9, wherein the at least one resilient member is in contact with both the rear surface of the ball striking face member and the front surface of the rear weight member. ### Claim 11 (depends on 9) The iron type golf club head of claim 9, wherein the rear weight member comprises a rear perimeter weight, wherein the rear perimeter weight at least in part defines a rear cavity area. ### Claim 12 (depends on 9) The iron type golf club head of claim 9, wherein the ball striking face member further comprises a hosel integrally formed with ball striking face member. ### Claim 13 (depends on 9) The iron type golf club head of claim 9, wherein the raised rib element comprises a half-cylinder shape, wherein the raised rib element comprises a half circle cross section. ### Claim 14 (depends on 13) The iron type golf club head of claim 13, wherein the at least one resilient member comprises a half-cylinder recess configured to receive the raised rib element. ### Claim 15 An iron-type golf club head, comprising: a ball striking face member including a rear surface and a ball striking face; a rear weight member including a front surface, at least one resilient member between the front surface of the rear weight member and the rear surface of the ball striking face member, wherein the front surface of the rear weight member and the rear surface of the ball striking face member face one another and define a space therebetween; wherein the at least one resilient member is disposed within the space, wherein the ball striking face member comprises a first material having a first hardness, wherein the rear weight member comprises a second member having a second hardness, and wherein the at least one resilient member comprises at least a third hardness, wherein no portion of the at least one resilient member comprises a hardness greater than any portion of the ball striking face member or rear weight member; wherein the hardness of the at least one resilient member is varied; wherein the front surface of the rear weight member comprises an engagement member, wherein the engagement member comprises a raised rib element formed as part of the rear weight member, wherein the raised rib element projects forward from the front surface of the rear weight member, wherein the raised rib element extends from a toe portion of the rear weight member to a heel portion of the rear weight member, wherein the at least one rear weight member and varied hardness of the at least one resilient member are configured to receive transferred energy from impact between the face member and a ball, and to selectively limit compressibility of the space between the ball striking face member and the rear weight member and divide the space into: (a) an area of low compressibility located above the raised rib element, and (b) an area of high compressibility located below the raised rib element, wherein the raised rib element is arranged with respect to a center of gravity of the golf club head such that the raised rib element passes through the center of gravity of the iron type golf club head.