Golf club head

• US 20070129165A1
• Filed: 05/16/2006
• 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 7,611,423 B2
• 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 2209/00 Characteristics of used materials
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 53/0475 with one or more enclosed cavities
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like
• CPC Class Codes: A63B 60/54 with means for damping vibrations

Abstract

This invention provides a 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 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, wherein said first viscoelastic body and said second viscoelastic body are disposed within the golf club head.

6. The head according to claim 1, comprising

a head main body, and

a face plate fixed to a front surface side of said head main body to form a face surface,

wherein said first viscoelastic body is disposed within the golf club head to be in tight contact with a rear surface of said face plate.

7. The head according to claim 6, wherein said second viscoelastic body is disposed within the golf club head behind said first viscoelastic body, and

a peak value temperature of the loss coefficient of the first viscoelastic material is lower than that of the loss coefficient of the second viscoelastic material.

8. The head according to claim 1, wherein said head comprises an iron 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.