Golf club head

• US 20070129160A1
• Filed: 05/17/2006
• Published: 06/07/2007
• Est. Priority Date: 12/05/2005
• Status: Active Grant

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: Matsunaga, Hideo, Shimazaki, Hideo, Ban, Wataru
• Granted Patent: US 7,686,707 B2
• Time in Patent Office: Days
• US Class Current: 473/332
• CPC Class Codes: A63B 2209/00 Characteristics of used materials
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/0462 characterised by tapering thickness of the impact face plate
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/54 with means for damping vibrations

Abstract

This invention provides a hollow golf club head having a first viscoelastic body made of a first viscoelastic material and a second viscoelastic body made of a second viscoelastic material with a loss coefficient the temperature dependence of which is different from that of a loss coefficient of the first viscoelastic material.

Claims

1. A hollow golf club head having

a first viscoelastic body made of a first viscoelastic material and

a second viscoelastic body made of a second viscoelastic material with a loss coefficient a temperature dependence of which is different from that of a loss coefficient of the first viscoelastic material.

2. The head according to claim 1, wherein a peak value temperature of the loss coefficient of the first viscoelastic material and that of the loss coefficient of the second viscoelastic material are different.

3. The head according to claim 1, wherein a peak value of the loss coefficient of the first viscoelastic material and that of the loss coefficient of the second viscoelastic material are both not less than 0.3.

4. The head according to claim 1, wherein peak value temperatures of the loss coefficients of one and the other of the first viscoelastic material and the second viscoelastic material are less than −

30°

C. and not less than −

30°

C., respectively.

5. The head according to claim 1, further comprising a fixing portion provided to a circumferential wall of the golf club head for fixing said first viscoelastic body and said second viscoelastic body in a stacked manner.

6. The head according to claim 1, further comprising a first fixing portion and a second fixing portion provided to a circumferential wall of the golf club head for fixing said first viscoelastic body and said second viscoelastic body separately.

7. The head according to claim 1, wherein at least either one of said first viscoelastic body and said second viscoelastic body is fixed in a sole portion of the golf cub head.

8. The head according to claim 1, wherein aid head comprises any one of a wood type golf club head and utility type golf club head.

9. The head according to claim 1, further comprising

one or a plurality of viscoelastic bodies different from said first viscoelastic body and said second viscoelastic body,

wherein the viscoelastic materials that form said one or plurality of viscoelastic bodies, said first viscoelastic body, and said second viscoelastic body have loss coefficients temperature dependences of which are different from each other.