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US20080234066A1 - Golf Club Head Having a Face Insert and Method of Making Same - Google Patents

Golf Club Head Having a Face Insert and Method of Making Same Download PDF

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Publication number
US20080234066A1
US20080234066A1 US11/690,696 US69069607A US2008234066A1 US 20080234066 A1 US20080234066 A1 US 20080234066A1 US 69069607 A US69069607 A US 69069607A US 2008234066 A1 US2008234066 A1 US 2008234066A1
Authority
US
United States
Prior art keywords
insert
cavity
platform
side wall
golf club
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/690,696
Inventor
David D. Jones
John K. Solheim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Karsten Manufacturing Corp
Original Assignee
Karsten Manufacturing Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Karsten Manufacturing Corp filed Critical Karsten Manufacturing Corp
Priority to US11/690,696 priority Critical patent/US20080234066A1/en
Assigned to KARSTEN MANUFACTURING CORPORATION reassignment KARSTEN MANUFACTURING CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SOLHEIM, JOHN K., JONES, DAVID D.
Priority to GB0723710A priority patent/GB2447717A/en
Priority to CA002618319A priority patent/CA2618319A1/en
Publication of US20080234066A1 publication Critical patent/US20080234066A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0416—Heads having an impact surface provided by a face insert
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0487—Heads for putters
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00—Golf clubs
    • A63B53/04—Heads
    • A63B53/0416—Heads having an impact surface provided by a face insert
    • A63B53/042—Heads having an impact surface provided by a face insert the face insert consisting of a material different from that of the head
    • A63B53/0425—Heads having an impact surface provided by a face insert the face insert consisting of a material different from that of the head the face insert comprising two or more different materials
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations

Definitions

  • This invention relates generally to golf equipment and, in particular, to golf clubs.
  • the present invention comprises a golf club.
  • the golf club includes a club head body, the front face of which has a cavity with a first sub-cavity and a second sub-cavity for receiving a first insert and a second insert, respectively.
  • the cavity is defined by a bottom wall, a lower side wall, an upper side wall and a platform separating the lower and upper side walls.
  • the first sub-cavity comprises a lower portion of the cavity located between the bottom wall and the platform
  • the second sub-cavity comprises an upper portion of the cavity located between the platform and the front face.
  • a first insert is disposed in the first sub-cavity
  • a second insert is disposed in the second sub-cavity.
  • the first and second inserts are formed of different materials.
  • FIG. 1 is a front exploded perspective view of a golf club head according to one embodiment of the present invention
  • FIG. 2 is a front elevational view of the golf club head shown in FIG. 1 ;
  • FIG. 3 is a sectional view taken along lines 3 - 3 of FIG. 2 ;
  • FIG. 4 is a sectional view of a golf club head in accordance with another embodiment of the present invention.
  • a golf club head 10 such as a golf putter head, comprises a club head body 12 and a hosel 14 with a boss 16 counterbored for receiving one end of a golf club shaft 17 .
  • the body 12 has a front face 18 , a rear surface 19 , a heel end 20 , and a toe end 22 .
  • the front face 18 has a cavity 24 formed therein defined by a bottom wall 26 , a lower side wall 28 , a platform 30 , and an upper side wall 32 .
  • the platform 30 separates the lower side wall 28 and the upper side wall 32 .
  • Platform 30 may also be referred to as a step or a ledge.
  • the lower side wall 28 is located below the platform 30 between the bottom wall 26 and the platform 30 .
  • the upper side wall 32 is located above the platform 30 between the platform 30 and the front face 18 .
  • Protrusions 38 extend from upper side wall 32 .
  • a first sub-cavity 34 is defined between the bottom wall 26 and the platform 30 .
  • the first sub-cavity 34 or lower portion 34 of cavity 24 , is circumscribed by the lower side wall 28 .
  • a second sub-cavity 36 is defined between the platform 30 and the front face 18 .
  • the second sub-cavity 36 or upper portion 36 of cavity 24 , is circumscribed by the upper side wall 32 .
  • the first sub-cavity 34 has a smaller area than the second sub-cavity 36 .
  • the club head body 12 is made of a material such as a metal formed by an investment casting process. Suitable metals used to form club head body 12 include steel, titanium, aluminum, tungsten, brass, bronze, beryllium copper, or the like. Those skilled in the art will recognize also that the club head body 12 may be made of other metallic or non-metallic materials.
  • the bottom wall 26 , the lower side wall 28 , the platform 30 , the upper side wall 32 , and the protrusions 38 are then shaped by a milling process to maintain precise tolerances.
  • a first insert 44 is disposed in the first sub-cavity 34 .
  • the damping insert 44 may be attached to the bottom wall 26 of the first sub-cavity 34 using conventional means such as adhesive.
  • the damping insert 44 is preferably made of a first polymer having a shore A hardness (durometer) ranging from about 25 to about 55.
  • the damping insert 44 may be preformed by an injection molding process in which an elastomeric polymer such as silicone is injected into a mold cavity.
  • the damping insert 44 may be formed and cured in the first sub-cavity 34 .
  • Suitable materials for damping insert 44 include silicone, silicone dielectric gel, silicone rubber, or any other highly resilient elastomer.
  • the damping insert 44 After formation of the damping insert 44 , it is cured and inserted into the first sub-cavity 34 substantially covering the bottom wall 26 of the cavity 24 .
  • the damping insert 44 lies adjacent the lower side wall 28 .
  • the damping insert 44 has a width “W D ” of approximately 2.15 inches and a height “H D ” of approximately 0.65 inches.
  • a second insert 46 is disposed in the second sub-cavity 36 above the platform 30 substantially covering the first insert 44 .
  • the face insert 46 may be attached to the first insert 44 and the platform 30 using conventional means such as adhesive.
  • the face insert 46 may be preformed of a second polymer having a shore D hardness ranging from about 45 to about 75.
  • the face insert 46 may be formed and cured in the second sub-cavity 36 .
  • the face insert 46 is formed of a polymer that is different from that of the damping insert 44 and different from the material of the club head body 12 .
  • the face insert 46 also has a hardness (durometer) or resiliency that is different from that of the damping insert 44 .
  • the face insert 46 is made of polyurethane, which is molded using an injection molding process and cured. After formation, the face insert 46 is inserted into the second sub-cavity 36 . The face insert 46 lies adjacent the upper side wall 32 . The protrusions 38 position the face insert 46 in the second sub-cavity 36 so that a circumferential gap exists between the face insert 46 and the upper side wall 32 . This circumferential gap will later be filled with material such as paint in order to complete the golf club head 10 as disclosed in U.S. Pat. No. 6,913,545 to D. D. Jones et al.
  • the face insert 46 has a width “W F ” of approximately 2.24 inches and a height “H F ” of about 0.75 inches.
  • the combined thickness of the damping insert 44 and the face insert 46 is less than about 0.25 inches as measured between the front face 18 and the bottom wall 26 .
  • FIG. 3 is a sectional view taken along lines 3 - 3 of FIG. 2 and further illustrates the bottom wall 26 , the lower side wall 28 , the platform 30 , and the upper side wall 32 .
  • Damping insert 44 is attached to bottom wall 26 and face insert 46 is attached to damping insert 44 and platform 30 .
  • a club head body 12 has a damping insert 50 disposed within the first sub-cavity 34 .
  • the damping insert 50 comprises double-sided adhesive tape which is about 0.015 inches thick and cut to a size and shape that matches bottom wall 26 .
  • the damping insert 50 has adhesive surfaces 52 .
  • One of the adhesive surfaces 52 contacts or is attached to the bottom wall 26 of the first sub-cavity 34 .
  • the face insert 46 is placed in the second sub-cavity 36 and attached to the other adhesive surface 52 of the damping insert 50 .
  • the face insert 46 may injected onto an exposed surface 52 of the double-sided adhesive tape 50 and then cured.
  • the face insert 46 is polymer with a Shore D hardness when cured.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Golf Clubs (AREA)

Abstract

A golf club includes a club head body having a front face with a cavity formed therein. The cavity has a bottom wall, a lower side wall, an upper side wall and a platform separating the lower and upper side walls. A first sub-cavity is defined between the bottom wall and the platform. A second sub-cavity is defined between the platform and the front face. A damping insert is disposed in the first sub-cavity, and a face insert is disposed in the second sub-cavity.

Description

    BACKGROUND
  • This invention relates generally to golf equipment and, in particular, to golf clubs.
  • In order to improve the “feel” of golf clubs, especially putters, golf manufacturers have frequently provided a face insert that forms the striking face of the club head. Early golf clubs had face inserts made of cork, wood, rubber, or gutta-percha. Recent golf clubs have face inserts made polymer resin, graphite epoxy and polyurethane. Examples of recent golf clubs with face inserts include U.S. Pat. No. 5,575,472 to Magerman et al, U.S. Pat. No. 5,524,331 to Pond, U.S. Pat. No. 5,458,332 to Fisher and U.S. Patent Publication No. 2005/0020378 to Krumme et al.
    • SUMMARY
  • The present invention comprises a golf club. In one embodiment, the golf club includes a club head body, the front face of which has a cavity with a first sub-cavity and a second sub-cavity for receiving a first insert and a second insert, respectively. The cavity is defined by a bottom wall, a lower side wall, an upper side wall and a platform separating the lower and upper side walls. The first sub-cavity comprises a lower portion of the cavity located between the bottom wall and the platform, and the second sub-cavity comprises an upper portion of the cavity located between the platform and the front face. A first insert is disposed in the first sub-cavity, and a second insert is disposed in the second sub-cavity. The first and second inserts are formed of different materials.
    • DRAWINGS
  • FIG. 1 is a front exploded perspective view of a golf club head according to one embodiment of the present invention;
  • FIG. 2 is a front elevational view of the golf club head shown in FIG. 1;
  • FIG. 3 is a sectional view taken along lines 3-3 of FIG. 2; and
  • FIG. 4 is a sectional view of a golf club head in accordance with another embodiment of the present invention.
    •  DESCRIPTION
  • With reference to FIGS. 1 and 2, a golf club head 10, such as a golf putter head, comprises a club head body 12 and a hosel 14 with a boss 16 counterbored for receiving one end of a golf club shaft 17. The body 12 has a front face 18, a rear surface 19, a heel end 20, and a toe end 22. The front face 18 has a cavity 24 formed therein defined by a bottom wall 26, a lower side wall 28, a platform 30, and an upper side wall 32. The platform 30 separates the lower side wall 28 and the upper side wall 32. Platform 30 may also be referred to as a step or a ledge. The lower side wall 28 is located below the platform 30 between the bottom wall 26 and the platform 30. The upper side wall 32 is located above the platform 30 between the platform 30 and the front face 18. Protrusions 38 extend from upper side wall 32.
  • A first sub-cavity 34 is defined between the bottom wall 26 and the platform 30. The first sub-cavity 34, or lower portion 34 of cavity 24, is circumscribed by the lower side wall 28. A second sub-cavity 36 is defined between the platform 30 and the front face 18. The second sub-cavity 36, or upper portion 36 of cavity 24, is circumscribed by the upper side wall 32. The first sub-cavity 34 has a smaller area than the second sub-cavity 36.
  • Typically, the club head body 12, including the cavity 24, is made of a material such as a metal formed by an investment casting process. Suitable metals used to form club head body 12 include steel, titanium, aluminum, tungsten, brass, bronze, beryllium copper, or the like. Those skilled in the art will recognize also that the club head body 12 may be made of other metallic or non-metallic materials. The bottom wall 26, the lower side wall 28, the platform 30, the upper side wall 32, and the protrusions 38 are then shaped by a milling process to maintain precise tolerances.
  • A first insert 44, also referred to as a damping insert, is disposed in the first sub-cavity 34. The damping insert 44 may be attached to the bottom wall 26 of the first sub-cavity 34 using conventional means such as adhesive. The damping insert 44 is preferably made of a first polymer having a shore A hardness (durometer) ranging from about 25 to about 55. In this embodiment, the damping insert 44 may be preformed by an injection molding process in which an elastomeric polymer such as silicone is injected into a mold cavity. Alternatively, the damping insert 44 may be formed and cured in the first sub-cavity 34. Suitable materials for damping insert 44 include silicone, silicone dielectric gel, silicone rubber, or any other highly resilient elastomer. After formation of the damping insert 44, it is cured and inserted into the first sub-cavity 34 substantially covering the bottom wall 26 of the cavity 24. The damping insert 44 lies adjacent the lower side wall 28. By way of example, the damping insert 44 has a width “WD” of approximately 2.15 inches and a height “HD” of approximately 0.65 inches.
  • A second insert 46, also referred to as a face insert, is disposed in the second sub-cavity 36 above the platform 30 substantially covering the first insert 44. The face insert 46 may be attached to the first insert 44 and the platform 30 using conventional means such as adhesive. The face insert 46 may be preformed of a second polymer having a shore D hardness ranging from about 45 to about 75. Alternatively, the face insert 46 may be formed and cured in the second sub-cavity 36. The face insert 46 is formed of a polymer that is different from that of the damping insert 44 and different from the material of the club head body 12. Preferably, the face insert 46 also has a hardness (durometer) or resiliency that is different from that of the damping insert 44. In the illustrative embodiment, the face insert 46 is made of polyurethane, which is molded using an injection molding process and cured. After formation, the face insert 46 is inserted into the second sub-cavity 36. The face insert 46 lies adjacent the upper side wall 32. The protrusions 38 position the face insert 46 in the second sub-cavity 36 so that a circumferential gap exists between the face insert 46 and the upper side wall 32. This circumferential gap will later be filled with material such as paint in order to complete the golf club head 10 as disclosed in U.S. Pat. No. 6,913,545 to D. D. Jones et al. By way of example, the face insert 46 has a width “WF” of approximately 2.24 inches and a height “HF” of about 0.75 inches. The combined thickness of the damping insert 44 and the face insert 46 is less than about 0.25 inches as measured between the front face 18 and the bottom wall 26.
  • FIG. 3 is a sectional view taken along lines 3-3 of FIG. 2 and further illustrates the bottom wall 26, the lower side wall 28, the platform 30, and the upper side wall 32. Damping insert 44 is attached to bottom wall 26 and face insert 46 is attached to damping insert 44 and platform 30.
  • With reference to FIG. 4, in another embodiment, a club head body 12 has a damping insert 50 disposed within the first sub-cavity 34. The damping insert 50 comprises double-sided adhesive tape which is about 0.015 inches thick and cut to a size and shape that matches bottom wall 26. The damping insert 50 has adhesive surfaces 52. One of the adhesive surfaces 52 contacts or is attached to the bottom wall 26 of the first sub-cavity 34. The face insert 46 is placed in the second sub-cavity 36 and attached to the other adhesive surface 52 of the damping insert 50. Alternatively, the face insert 46 may injected onto an exposed surface 52 of the double-sided adhesive tape 50 and then cured. In this embodiment, the face insert 46 is polymer with a Shore D hardness when cured.

Claims (20)

1. A method of making a golf club comprising:
providing a club head body having a front face with a cavity formed therein, the cavity being defined by a bottom wall, a lower side wall, an upper side wall and a platform separating said lower and upper side walls with the lower side wall being located below the platform and the upper side wall being located above the platform;
inserting a first insert formed of a first material in a lower portion of the cavity located between the bottom wall and the platform substantially covering the bottom wall and lying adjacent the lower side wall; and
inserting a second insert formed of a second material in an upper portion of the cavity located between the platform and the front face substantially covering the first insert and lying adjacent the upper side wall.
2. The method of claim 1, wherein inserting the first insert comprises:
preforming the first insert; and
attaching the first insert to the bottom wall.
3. The method of claim 2, wherein the first insert is formed of a first polymer having a Shore A hardness.
4. The method of claim 2, wherein inserting the second insert comprises:
preforming the second insert; and
attaching the second insert to the first insert and the platform.
5. The method of claim 4, wherein the second insert is formed of a second polymer having a Shore D hardness.
6. The method of claim 4, wherein the first polymer is selected from a group of materials including elastomer, silicone, silicone dielectric gel, and silicone rubber.
7. The method of claim 2, wherein attaching the first insert to the bottom wall comprises using adhesive.
8. The method of claim 4, wherein attaching the second insert to the first insert and the platform comprises using adhesive.
9. A golf club comprising:
a club head body having a heel end, a toe end, and a front face with a cavity formed therein, said cavity being defined by a bottom wall, a lower side wall, an upper side wall, and a platform separating said lower and upper side walls, the lower side wall being located between the bottom wall and the platform, the upper side wall being located between the platform and the front face, the cavity having a lower portion circumscribed by the lower side wall and an upper portion circumscribed by the upper side wall;
a damping insert formed of a first material disposed in the lower portion of the cavity; and
a face insert formed of a second material disposed in the upper portion of the cavity.
10. The golf club of claim 9, wherein said first material comprises an elastomer, and wherein said second material comprises polyurethane.
11. The golf club of claim 9, wherein said first material comprises a material having a Shore A hardness, and wherein said second material comprises a material having a Shore D hardness.
12. The golf club of claim 9, wherein said first material comprises a double-sided adhesive material.
13. A golf club head comprising:
a body having a heel end, a toe end and a front face with a cavity formed therein, said cavity including a bottom wall, a lower side wall, an upper side wall, and a platform separating said lower and upper side walls, said cavity comprising a first sub-cavity defined between the bottom wall and the platform, and a second sub-cavity defined between the platform and the front face;
a first insert formed of a first material disposed in the first sub-cavity; and
a second insert formed of a second material disposed in the second sub-cavity above the first insert.
14. The golf club head of claim 13, wherein said lower side wall is located between the bottom wall and the platform, and wherein the upper side wall is located between the platform and the front face.
15. The golf club head of claim 13, wherein said body is formed of a third material.
16. The golf club head of claim 13, wherein said first material has a Shore A hardness, and wherein said second material has a Shore D hardness.
17. The golf club head of claim 13, wherein said first material comprises an elastomer, and wherein said second material comprises a polymer.
18. The golf club head of claim 13, wherein said first material comprises a double-sided adhesive material.
19. The golf club head of claim 13, wherein said first material includes material selected from a group of materials including an elastomer, a dielectric gel, and a silicone rubber.
20. The golf club head of claim 15, wherein the third material comprises metal.
US11/690,696 2007-03-23 2007-03-23 Golf Club Head Having a Face Insert and Method of Making Same Abandoned US20080234066A1 (en)

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Application Number Priority Date Filing Date Title
US11/690,696 US20080234066A1 (en) 2007-03-23 2007-03-23 Golf Club Head Having a Face Insert and Method of Making Same
GB0723710A GB2447717A (en) 2007-03-23 2007-12-04 Golf club head having a face insert and method of making same
CA002618319A CA2618319A1 (en) 2007-03-23 2008-01-04 Golf club head having a face insert and method of making same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/690,696 US20080234066A1 (en) 2007-03-23 2007-03-23 Golf Club Head Having a Face Insert and Method of Making Same

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JP2013523320A (en) * 2010-04-06 2013-06-17 ナイキ インターナショナル リミテッド Putter head and putter containing polymer material as part of the ball striking surface
US20140038744A1 (en) * 2010-09-22 2014-02-06 Leatt Corporation Golf club with a cushion made of viscoelastic material
US9446292B2 (en) 2008-05-19 2016-09-20 Nike, Inc. Golf club heads
US9517394B1 (en) * 2015-04-14 2016-12-13 Callaway Golf Company Putter-type golf club head with dampening screw
US9526952B1 (en) * 2015-03-19 2016-12-27 Callaway Golf Company Putter-type golf club head with sound chamber
US20170173412A1 (en) * 2015-05-28 2017-06-22 Karsten Manufacturing Corporation Iron-Type Golf Clubs And Golf Club Heads
JP6254319B1 (en) * 2017-06-08 2017-12-27 羽立工業株式会社 Golf club
US9943735B2 (en) * 2014-07-16 2018-04-17 Guerin D. Rife Putter face with variable sized ball contact land areas
CN110314353A (en) * 2018-08-27 2019-10-11 南京佑天金属科技有限公司 A kind of amorphous alloy glof club head and its manufacturing method
US10583338B2 (en) 2011-09-30 2020-03-10 Karsten Manufacturing Corporation Grooves of golf club heads and methods to manufacture grooves of golf club heads
US10912973B2 (en) 2017-04-10 2021-02-09 Guerin D. Rife Weighted golf grip
US11083938B2 (en) 2008-08-07 2021-08-10 Karsten Manufacturing Corporation Grooves of golf club heads and methods to manufacture grooves of golf club heads
US11161022B2 (en) 2011-09-30 2021-11-02 Karsten Manufacturing Corporation Golf club heads with a multi-material striking surface
US11207572B2 (en) 2019-08-01 2021-12-28 Karsten Manufacturing Corporation Golf club heads with a multi-material striking surface
US20220118330A1 (en) * 2018-02-12 2022-04-21 Drive Step Products LLC Coaching Tool For Footwork Development
US20220241656A1 (en) * 2017-01-19 2022-08-04 Guerin D. Rife Golf club putter
US11420100B2 (en) 2008-08-07 2022-08-23 Karsten Manufacturing Corporation Grooves of golf club heads and methods to manufacture grooves of golf club heads
WO2022200196A1 (en) * 2021-03-23 2022-09-29 Phacel Llc Golf club head comprising a strike face with a hardness suitable for the hardness a golf ball
US20230166167A1 (en) * 2016-07-26 2023-06-01 Acushnet Company Golf club having a damping element for ball speed control
US11684831B2 (en) * 2017-01-10 2023-06-27 Parsons Xtreme Golf, LLC Golf club heads and methods to manufacture golf club heads
US11918864B2 (en) 2019-08-01 2024-03-05 Karsten Manufacturing Corporation Golf club heads with a multi-material striking surface
US11992736B2 (en) 2008-08-07 2024-05-28 Karsten Manufacturing Corporation Grooves of golf club heads and methods to manufacture grooves of golf club heads
US12138513B2 (en) 2021-11-02 2024-11-12 Karsten Manufacturing Corporation Golf club heads with a multi-material striking surface

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WO2010099530A1 (en) * 2009-02-27 2010-09-02 Ballenger Matthew B Golf club with high friction striking surface
GB0919682D0 (en) 2009-11-11 2009-12-23 Hi Lex Cable System Company Ltd Damper

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