CLUB HEAD FOR IRON GOLF CLUB

• US 20080161126A1
• Filed: 10/31/2007
• Published: 07/03/2008
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: KAJITA, Ryota
• Granted Patent: US 7,670,236 B2
• Time in Patent Office: Days
• US Class Current: 473/350
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/0454 Strengthening ribs on the rear surface of the impact face plate
• CPC Class Codes: A63B 53/047 iron-type

Abstract

An iron club head for an iron golf club, includes: an upper portion of a face member; and a lower portion of the face member, wherein: a maximum height (H) on the face member at which a ball is to be hit is obtained by an equation: H=Rb×(1−sin(loft angle−8)+DP/2×cos(loft angle) where, Rb: ball radius (21.4 mm), and Dp: strike mark diameter (15 mm); the upper portion is arranged upper than the height (H) obtained by the equation as a boundary; and a thickness of the upper portion, excluding a circumferential edge, is formed thinner than a thickness of the lower portion, the thickness of the upper portion being made to be 1±0.2 mm (0.8 to 1.2 mm).

Claims

1. An iron club head for an iron golf club, comprising:

an upper portion of a face member; and

a lower portion of the face member, wherein;

a maximum height (H) on the face member at which a ball is to be hit is obtained by an equation;

H=Rb×

(1−

sin(loft angle−

8)+DP/2×

cos(loft angle) where, Rb;

ball radius (21.4 mm), and Dp;

strike mark diameter (15 mm);

the upper portion is arranged upper than the height (H) obtained by the equation as a boundary; and

a thickness of the upper portion, excluding a circumferential edge, is formed thinner than a thickness of the lower portion, the thickness of the upper portion being made to be 1±

0.2 mm (0.8 to 1.2 mm).

2. The iron club head according to claim 1, further comprising

a rib that connects the circumferential edge of the upper portion with the lower portion, the rib arranged on a back of the upper portion which has the thickness of 1±

0.2 mm (0.8 to 1.2 mm).