Golf club head

• US 9,168,430 B2
• Filed: 07/02/2013
• Issued: 10/27/2015
• Est. Priority Date: 07/13/2012
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Dunlop Sports Co. Ltd. (Sumitomo Rubber Industries Limited)
• Inventors: Mizutani, Naruhiro
• Primary Examiner(s): Passaniti, Sebastiano
• Application Number:
  US13/933,810
• Publication Number:
  US 20140018185A1
• Time in Patent Office: 847 Days
• Field of Search: 473324-350, 473287-292
• US Class Current: 1/1
• CPC Class Codes: A63B 2053/0491 with added weights, e.g. changeable, replaceable
• 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 60/002 Resonance frequency related characteristics
• CPC Class Codes: A63B 60/42 Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand

Abstract

A hollow golf club head comprises a head main body made of a metallic material and having a bottom portion including a first portion and a second portion being connected with the first portion having difference in level, and at least one weight member having a specific gravity larger than that of the head main body and attached to the second portion of the head main body.

Claims

1. A hollow golf club head comprising

a head main body made of a metallic material and having a bottom portion provided with a recess, the bottom portion recess comprising a toe-side primary portion, a heel-side primary portion, and a secondary portion provided between the heel-side portion and the toe-side portion, wherein the height of the toe-side primary portion and the height of the heel-side primary portion are both greater than the height of the secondary portion, and wherein the secondary portion has a thickness larger than those of the toe-side primary portion and the heel-side primary portion, and

at least one weight member having a specific gravity larger than that of said head main body, said weight member comprising a first weight member attached to the toe-side primary portion of said bottom portion recess and a second weight member attached to the heel-side primary portion of said bottom portion recess.

2. The golf club head according to claim 1, wherein the recess has a thickness smaller than that of the remainder of the bottom portion around the recess.

3. The golf club head according to claim 1, wherein the bottom portion recess has a thickness in a range of from 0.5 to 2.0 mm.

4. The golf club head according to claim 1, wherein the difference between thicknesses of the recess and the remainder of the bottom portion around the recess is in a range of not less than 0.1 mm.

5. The golf club head according to claim 1, wherein the recess has a longitudinal width along the front-back direction of the head, wherein the longitudinal width gradually enlarges toward a heel side and a toe side from its center.

6. The golf club head according to claim 1, wherein

the toe-side primary portion and the secondary portion are smoothly connected to one another, and

the heel-side primary portion and the secondary portion are smoothly connected to one another.

7. A hollow golf club head comprising

a head main body made of a metallic material and having a bottom portion provided with a recess, the bottom portion recess comprising a toe-side primary portion, a heel-side primary portion, and a secondary portion provided between the heel-side portion and the toe-side portion, wherein the height of the toe-side primary portion and the height of the heel-side primary portion are both greater than the height of the secondary portion, and wherein the secondary portion has a thickness smaller than that of the remainder of the bottom portion around the recess, and

at least one weight member having a specific gravity larger than that of said head main body, said weight member comprising a first weight member attached to the toe-side primary portion of said bottom portion recess and a second weight member attached to the heel-side primary portion of said bottom portion recess.