Golf club head

• US 20010007837A1
• Filed: 03/13/2001
• Published: 07/12/2001
• Est. Priority Date: 01/30/1998
• Status: Active Grant

• Current Assignee: Daisuke Mikame, Hirato Shimasaki, Makoto Kubota, Yasunori Imamoto, Yuu Hasebe
• Original Assignee: Daisuke Mikame, Hirato Shimasaki, Makoto Kubota, Yasunori Imamoto, Yuu Hasebe
• Inventors: Imamoto, Yasunori, Kubota, Makoto, Mikame, Daisuke, Shimasaki, Hirato, Hasebe, Yuu
• Granted Patent: US 6,572,491 B2
• Time in Patent Office: Days
• US Class Current: 473/349
• CPC Class Codes: A63B 2053/0491 with added weights, e.g. changeable, replaceable
• CPC Class Codes: A63B 2209/00 Characteristics of used materials
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0433 with special sole configurations
• 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

Abstract

A golf club head having a hollow construction, including a bar-like gravity adjusting piece (4) which extends longitudinally from a toe (7) towards a heel (8), or vice versa, of the head and is secured directly on an inner surface of a sole portion (2) in a position nearer to a front face (3) or wherein a forward half area (F) of the sole portion (2) as viewed from above, that is nearer to a face member (3′) of the head, has a thickness two or more times greater in at least a portion thereof than an average thickness of a rearward half area (R) of the sole portion, that is nearer to a back side (10).

Claims

1. A golf club head of 250 cc or more in volume and having a hollow construction, including a bar-like gravity adjusting piece extending longitudinally from a toe towards a heel, or vice versa, of the head and secured directly on an inner surface of a sole portion in a position nearer to an inner surface of a front face.

2. A golf club of 250 cc or more in volume and having a hollow construction, including three gravity adjusting pieces:

a piece (A) secured directly on an inner surface of a sole portion of the head in a position nearer to a toe portion, a piece (B) secured directly on the sole inner surface in a position nearer to a back side of the head, and a piece (C) secured directly on the sole inner surface in a position nearer to a heel portion, these gravity adjusting pieces being in a weight relationship of A+B≦

C.

3. A golf club head of 250 cc or more in volume and having a hollow construction, in which an arcuate length (l₁) from a front edge of a crown portion of the head to a front edge of a sole portion, a circumferential length (l₂) from the crown front edge through the back side to the sole front edge, and a gravity depth (D) of the head in a cross section of the head in the direction of the head width at least in a sweet area of a front face, are in a relationship of (l₂/l₁)×

D≦

100 in the cross section.

4. The golf club head as set forth in

claim 3

, wherein there is formed on a portion of the cross section that will be the sole portion of the head a generally horizontal surface of 50 mm or less in width measured from a leading edge of the head that will be placed on the ground during addressing.

5. A golf club head having a hollow construction, a sole portion in the forward area, that is nearer to a front face of the head from a half of a head width being thicker than a sole portion in the rearward area, that is nearer to a back side of the head from the half of the head width.

6. A golf club head having a hollow construction, a forward half area of a sole portion of the head as viewed from above, that is nearer to a front face of the head, having a thickness two or more times greater in at least a portion thereof than an average thickness of a rearward half area of the sole portion, that is nearer to a back side of the head.

7. The golf club head as set forth in

claim 6

, wherein the forward area of the sole portion has a width smaller than a half of the sole width from the leading edge of the front face to the back side end.

8. The golf club head as set forth in

claim 6

or

7

, wherein the total area of the thick portion of the forward area is 25% or more of the area of the forward area.

9. The golf club head as set forth in any of

claims 6

to

8

, wherein portions of the forward area that are nearer to the toe and heel, respectively, are thick.