GOLF CLUB HEAD

• US 20080132351A1
• Filed: 12/01/2006
• Published: 06/05/2008
• Est. Priority Date: 12/01/2006
• Status: Active Grant

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: Ban, Wataru, Nguyen, Vinh-Duy Thai
• Granted Patent: US 7,815,521 B2
• Time in Patent Office: Days
• US Class Current: 473/331
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0445 Details of grooves or the like on the impact surface
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like

Abstract

The present invention provides a golf club head comprising, a face, a plurality of score line grooves formed in the face, traces formed in the face by milling; and a pair of side surfaces of the score line groove including a first surface that is contiguous with the face and a second surface that is contiguous with the first surface in the depth direction of the score line groove. A first angle that is formed by each first surface of the pair of side surfaces is larger than a second angle that is formed by each second surface of the pair of surfaces. The face in which the traces are formed has the arithmetic mean deviation of the profile (Ra) of not less than 4.00 μm.

Claims

1. A golf club head, comprising:

a face;

a plurality of score line grooves formed in said face;

traces formed in said face by milling; and

a pair of side surfaces of said score line groove including a first surface that is contiguous with said face and a second surface that is contiguous with said first surface in the depth direction of said score line groove,

wherein a first angle that is formed by each first surface of the pair of side surfaces is larger than a second angle that is formed by each second surface of the pair of surfaces, and

wherein said face in which said traces are formed has the arithmetic mean deviation of the profile (Ra) of not less than 4.00 μ

m.

2. The golf club head according to claim 1, wherein said face in which said traces are formed has the arithmetic mean deviation of the profile (Ra) of between 4.00 μ

m and 4.57 μ

m, inclusive.

3. The golf club head according to claim 1, wherein said traces are a plurality of striations, and an angle formed by an arrangement direction of the plurality of striations and said score line groove is between 40 degrees and 70 degrees, inclusive, as viewed clockwise from a toe side end of said score line groove.

4. The golf club head according to claim 3, wherein each striation forms a circular arc;

and the arrangement direction is a direction that intersects the center of the circular arc of each striation.

5. The golf club head according to claim 1, wherein each score line groove includes said pair of side surfaces and a bottom surface;

and

a width Wr (mm) of each score line groove as measured by the 30 degrees measurement rule, and a cross section area S (mm²) of each score line groove, are;

S/(Wr×

0.5)×

100≧

70%.

6. The golf club head according to claim 5, wherein the first angle is between 50 degrees and 100 degrees, inclusive.

7. The golf club head according to claim 1, wherein the second angle is not greater than 30 degrees.

8. The golf club head according to claim 1, wherein the boundary between the first surface and said face has a rounding of not more than 0.3 mm in radius.

9. The golf club head according to claim 5, wherein the first angle is between 10 degrees and 50 degrees, inclusive, and the boundary between said first surface and said face has a rounding of between 0.05 mm and 0.3 mm in radius, inclusive.

10. The golf club head according to claim 9, wherein the width Wr (mm) and the cross section area S (mm²) are:

S/(Wr×

0.5)×

100≧

80%.