Golf club head

• US 5,346,216 A
• Filed: 02/22/1993
• Issued: 09/13/1994
• Est. Priority Date: 02/27/1992
• Status: Expired due to Term

• Current Assignee: Daiwa Seiko Incorporated
• Original Assignee: Daiwa Resort Company Limited (Daiwa House Industry Company Limited)
• Inventors: Aizawa, Yuichi
• Primary Examiner(s): Brown, Theatrice
• Assistant Examiner(s): Passaniti, Sebastiano
• Application Number:
  US08/020,974
• Time in Patent Office: 568 Days
• Field of Search: 273/167 R, 273/77 A, 273/193 R, 273/194 R, 273/194 A, 273/DIG. 7, 273/DIG. 23, 273/80 C, 273/162 R, 273/186.2, 273/187.4, 273/77 R , 273/DIG. 3, 273/DIG. 10, 273/79
• US Class Current: 473/329
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/0458 with non-uniform thickness of the impact face plate
• CPC Class Codes: A63B 53/0462 characterised by tapering thickness of the impact face plate
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like
• CPC Class Codes: Y10S 273/23 High modulus filaments

Abstract

A golf club head which is more durable, capable of driving a golf ball further and providing a desirable, "soft" feeling when hitting the golf ball. These objectives are achieved by configuring the head to efficiently transmit and store potential energy due to impact with the golf ball. The head comprises a hollow shell defining a cup portion and an opening or concave portion which receives a face plate. The face plate forms a contact surface for striking a golf ball. The structural arrangement causes the hollow shell to elastically deform upon contact with a golf ball to enhance driving performance.

Claims

1. A golf club head, comprising:

a hollow shell including an opening portion and a cup portion sharing a first common perimeter, said opening portion extending into said cup portion and comprising at least one surface;

a bottom sharing a second common perimeter with said opening portion, said first common perimeter being dimensionally larger than said second common perimeter; and

a face plate received in and substantially filling a recess defined by the opening portion, said face plate defining a striking surface for striking a golf ball;

wherein said first common perimeter circumscribes said striking surface, and said opening portion, said cup portion and said bottom enclose an inner chamber.

2. The golf club head according to claim 1, wherein the opening portion defines a plane oriented at an acute angle relative to an imaginary straight line on which a sweet spot and a center of gravity of the golf club head are located.

3. The golf club head according to claim 1, wherein said bottom is planar.

4. The golf club head according to claim 1, wherein said inner chamber encapsulates a filling member.

5. The golf club head according to claim 1, wherein said face plate is secured to said bottom.

6. The golf club head according to claim 5, wherein said face plate is secured to said bottom with a screw countersunk flush with a ball hitting surface on said face plate.

7. The golf club head according to claim 6, wherein said ball hitting surface is a convex surface.

8. The golf club head according to claim 1, wherein wall thickness is reduced at a back portion of said cup portion with respect to a front portion of said cup portion, said back portion being distal and said front portion being proximate with respect to said opening portion.

9. The golf club head according to claim 1, wherein said hollow shell is made of metal, and said face plate is made of synthetic resin.

10. The golf club head according to claim 1, wherein all surfaces defined by said opening portion converge in a direction from said first common perimeter to said second common perimeter toward a center of gravity of the golf club head.

11. The golf club head according to claim 1, wherein said first common perimeter defines a closed curve bounding a curved area, said striking surface lying substantially in said curved area.

12. The golf club head according to claim 1, wherein said first common perimeter defines a closed curve bounding a curved area, said striking surface lying substantially in said curved area.

13. The golf club head according to claim 1, wherein said face plate is exposed only at said striking surface.

14. The golf club head according to claim 1, wherein said face plate is exposed only at said striking surface.

20. The golf club head according to claim 10, wherein wall thickness is reduced at a back portion of said cup portion with respect to a front portion of said cup portion, said back portion being distal and said front portion being proximate with respect to said common perimeter.

15. A gold club head, comprising:

a hollow shell including a concave portion and a cup portion sharing a common perimeter at a distal end of said concave and cup portions to form an enclosed inner chamber, said concave portion extending into said cup portion; and

a face plate received in and substantially filling a recess defined by said concave portion, said face plate defining a striking surface for striking a golf ball,

wherein said distal end is positioned adjacent said striking surface.

16. The golf club head according to claim 15, wherein said concave portion is substantially semicylindrical in cross-section.

17. The golf club head according to claim 15, wherein said concave portion is substantially parabolic in cross-section.

18. The golf club head according to claim 15, wherein said face plate includes a ball hitting surface opposite said concave portion.

19. The golf club head according to claim 18, wherein said ball hitting surface is a convex surface.

21. The golf club head according to claim 15, wherein said hollow shell is made of metal, and said face plate is made of synthetic resin.

22. A golf club head, comprising:

a hollow shell including a cup portion having an opening perimeter, a bottom located inside said cup portion thereby defining a recess in said club head, said bottom and said cup portion sharing a common perimeter, said common perimeter being dimensionally larger than said opening perimeter; and

a face plate received in and substantially filling said recess bounded between said opening perimeter and said bottom, said face plate defining a striking surface for a golf ball;

wherein said opening perimeter circumscribes said striking surface.

23. The golf club head according to claim 22, wherein said bottom is planar.

24. The golf club head according to claim 22, wherein said face plate in said recess is secured to said bottom.

25. The golf club head according to claim 22, wherein wall thickness is reduced at a back portion said cup portion with respect to a front portion of said cup portion, said back portion being distal and said front portion being proximate with respect to said opening perimeter.

26. The golf club head according to claim 22, wherein said hollow shell is made of metal, and said face plate is made of synthetic resin.

27. The golf club head according to claim 22, wherein said concave portion and said cup portion are joined only at said common perimeter.