Wood club head

• US 6,344,002 B1
• Filed: 09/15/1999
• Issued: 02/05/2002
• Est. Priority Date: 09/16/1998
• Status: Expired due to Term

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: Kajita, Ryota
• Primary Examiner(s): Passaniti, Sebastiano
• Application Number:
  US09/396,447
• Publication Number:
  US 20020013180A1
• Time in Patent Office: 874 Days
• Field of Search: 473/324, 473/331, 473/330, 473/349, 473/131, 473/290, 473/291, 473/345, 473/346, 473/350
• US Class Current: 473/330
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like

Abstract

In a wood club head having a face 2 constituted by convex surfaces curved vertically and horizontally, a bulge radius forming the substantially horizontally-curved surface is set to be not smaller than 15 inches.

Claims

1. A wood club head formed of titanium alloy and having a substantially hollow structure filled with a light sponge filler, wherein an inertial movement (IY) around a vertical axis (Y) passing through a center of gravity of said wood club head is set to be not smaller than 20 g·

mm·

sec² and a distance (ZG) perpendicular from said center of gravity to said face is set to be not larger than 30 mm;

wherein the bulge radius (R) is set to a value in a range of not smaller than 15 inches, at which the amount of displacement of a ball falling point with respect to a target direction becomes substantially zero, the value of the bulge radius (R) is based on the inertial moment (IY) and the distance (ZG) of said perpendicular.

2. A wood club head formed of titanium alloy and having a hollow structure filled with a light sponge filler, said club head comprising a face constituted by convex surfaces curved vertically and horizontally wherein,

a bulge radius forming the substantially horizontally-curved surface is set to be not smaller than 15 inches,

inertial moment (IY) around a vertical axis (Y) passing through a center of gravity of said club head is set to be not smaller than 20 g mm sec^{2, and}

a distance (ZG) of a perpendicular drawn from said center of gravity to said face is set to be not larger than 30 mm.