Golf club head

• US 7,059,972 B2
• Filed: 04/26/2001
• Issued: 06/13/2006
• Est. Priority Date: 05/15/2000
• Status: Expired due to Fees

• Current Assignee: Yokohama Rubber Company Limited
• Original Assignee: Yokohama Rubber Company Limited
• Inventors: Miyamoto, Masahiko
• Primary Examiner(s): Passaniti, Sebastiano
• Application Number:
  US09/842,051
• Publication Number:
  US 20020002084A1
• Time in Patent Office: 1,874 Days
• Field of Search: 473/330, 473/331, 473/345, 473/346, 473/342, 473/324, 473/349, 473/288
• 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 53/0445 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

Disclosed is a golf club head, in which a face surface is divided into upper and lower portions by a boundary line across a position of a sweet spot thereof, a roll radius of the upper portion is set at 305 mm or less, and a roll radius of the lower portion is set at 310 mm or more.

Claims

1. A wood-type golf club head comprising:

a face surface having upper and lower portions separated by a boundary line across the position of a sweet spot on the face surface, said face surface being free of a face surface portion at said boundary line other than said upper and lower portions of said face surface,

said upper portion having a roll radius of between 152 mm and 305 mm and said lower portion having a roll radius of 310 mm or more.

2. The golf club head according to claim 1, comprising a metallic hollow structure.

5. The golf club head according to claims 1, 3 or 4, comprising a metallic hollow structure.

6. The golf club head according to claims 1, 3 or 4, wherein said lower portion is formed by a plane surface while said upper portion is formed by a curved surface.

7. The golf club head according to claim 6, comprising a metallic hollow structure.

3. A wood-type golf club head comprising:

a face surface having upper and lower portions separated by a boundary line across the position of a sweet spot on the face surface, said upper portion and said lower portion being in contact with each other at said boundary line,

said upper portion having a roll radius of between 152 mm and 305 mm and said lower portion having a roll radius of 310 mm or more.

4. A wood-type golf club head comprising:

a face surface having upper and lower portions separated by a boundary line across the position of a sweet spot on the face surface, said upper portion contacting said lower portion across the entire face surface at said boundary line,

said upper portion having a roll radius of between 152 mm and 305 mm and said lower portion having a roll radius of 310 mm or more.