Golf club head

• US 20030032500A1
• Filed: 08/01/2002
• Published: 02/13/2003
• Est. Priority Date: 08/03/2001
• Status: Abandoned Application

• Current Assignee: Yokohama Rubber Company Limited
• Original Assignee: Yokohama Rubber Company Limited
• Inventors: Mori, Tomoaki, Nakahara, Norihiko, Nishizawa, Yoh
• Application Number:
  US10/208,739
• Publication Number:
  US 20030032500A1
• Time in Patent Office: Days
• US Class Current: 473/345
• CPC Class Codes: A63B 2053/0491 with added weights, e.g. changeable, replaceable
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0412 Volume
• 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
• CPC Class Codes: A63B 60/42 Devices for measuring, verifying, correcting or customising the inherent characteristics of golf clubs, bats, rackets or the like, e.g. measuring the maximum torque a batting shaft can withstand

Abstract

A golf club head is disclosed, which enables a low center of gravity to be achieved without spoiling appearance of the head and reducing strength thereof, and thus enables a carry to be increased. This golf club head has a hollow structure, and includes an opening in a crown portion and a plate member fixed to the opening. The plate member is made of a material having a specific strength of 294 N/mm² or higher. For example, this head includes a volume equal to or more than 350 cc, a center-of-gravity retreating amount GR from a shaft axis equal to or more than 15 mm, and a center-of-gravity position ratio GH/FH equal to or lower than 0.61. Here, the ratio GH/FH is calculated from a maximum height FH of a face surface and a center-of-gravity height GH on the face surface.

Claims

1. A golf club head having a hollow structure, comprising:

a crown portion;

an opening in the crown portion; and

a plate member fixed to the opening, the plate member being made of a material having a specific strength of 294 N/mm² or higher.

7. The golf club head according to claim 1, wherein a surface area ratio of the plate member to a portion above a position at half a maximum height of the crown portion is set equal to or higher than 20%.

2. A golf club head having a hollow structure, the head including:

a volume equal to or more than 350 cc;

a center-of-gravity retreating amount GR from a shaft axis equal to or more than 15 mm; and

a center-of-gravity position ratio GH/FH equal to or lower than 0.61, the ratio GH/FH being calculated from a maximum height FH of a face surface and a center-of-gravity height GH on the face surface.

6. The golf club head according to any one of claims 2 to 5, wherein an opening is provided in a crown portion, and a plate member made of a material having a specific strength of 294 N/mm² or higher is fixed to the opening.

8. The golf club head according to claim 6, wherein a surface area ratio of the plate member to a portion above a position at half a maximum height of the crown portion is set equal to or higher than 20%.

3. A golf club head having a hollow structure, the head including:

a volume equal to or more than 300 cc but less than 350 cc;

a center-of-gravity retreating amount GR from a shaft axis equal to or more than 18 mm; and

a center-of-gravity position ratio GH/FH equal to or lower than 0.55, the ratio GH/FH being calculated from a maximum height FH of a face surface and a center-of-gravity height GH on the face surface.

4. A golf club head having a hollow structure, the head including:

a volume equal to or more than 150 cc but less than 200 cc;

a center-of-gravity retreating amount GR from a shaft axis equal to or more than 12 mm; and

a center-of-gravity position ratio GH/FH equal to or lower than 0.50, the ratio GH/FH being calculated from a maximum height FH of a face surface and a center-of-gravity height GH on the face surface.

5. A golf club head having a hollow structure, the head including:

a volume equal to or more than 100 cc but less than 150 cc;

a center-of-gravity retreating amount GR from a shaft axis equal to or more than 8 mm; and

a center-of-gravity position ratio GH/FH equal to or lower than 0.50, the ratio GH/FH being calculated from a maximum height FH of a face surface and a center-of-gravity height GH on the face surface.