GOLF CLUB HEAD

• US 20080167138A1
• Filed: 01/04/2007
• Published: 07/10/2008
• Est. Priority Date: 01/04/2007
• 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 7,691,007 B2
• Time in Patent Office: Days
• US Class Current: 473/331
• CPC Class Codes: A63B 2069/402 giving spin
• 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

Abstract

This invention provides a plurality of grooves formed on a face of the golf club head. Each of a pair of side surfaces of each of the grooves has a first surface leading to the face and a second surface leading to the first surface in the depth direction of the groove. A first angle between the first surfaces of each of said pair of the side surfaces is larger than a second angle between the second surfaces of each of the said pair of the side surfaces. Edges of the groove are rounded. A width W (mm) of the groove measured including the rounded edges, a width Ws (mm) between the grooves adjacent one another, a width Wr (mm) of the groove measured based on the 30 degrees measurement rule and a cross section area S (mm²) of the groove satisfy the following expressions; W/Ws×100≧40 (%), S/(Ws×0.5)×100≧70 (%).

Claims

1. A golf club head comprising:

a plurality of grooves formed on a face of the golf club head; and

each of a pair of side surfaces of each of said grooves having a first surface leading to the face and a second surface leading to said first surface in the depth direction of said groove,

wherein a first angle between said first surfaces of each of said pair of the side surfaces is larger than a second angle between said second surfaces of each of said pair of the side surfaces,

edges of said groove are rounded, and

a width W (mm) of said groove measured including said rounded edges, a width Ws (mm) between said grooves adjacent one another, a width Wr (mm) of said groove measured based on the 30 degrees measurement rule and a cross section area S (mm²) of said groove satisfy the following expressions;

W/Ws×

100≧

40 (%)

S/(Ws×

0.5)×

100≧

70 (%).

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

said first angle is not more than 50 degrees;

and

a radius for said rounded edge of said groove is not more than 0.2 mm.

3. The gold club head according to claim 1, wherein

said width (mm) of said groove measured based on the 30 degrees measurement rule is equal to or more than 0.6 (mm) and not more than 0.9 (mm).