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Golf club head

  • US 7,686,707 B2
  • Filed: 05/17/2006
  • Issued: 03/30/2010
  • Est. Priority Date: 12/05/2005
  • Status: Active Grant
First Claim
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1. A hollow golf club head comprising:

  • a first recess portion formed in a portion of said head;

    a second recess portion formed in another portion of said head;

    a first viscoelastic body made of a first viscoelastic material, said first viscoelastic body fixed in said first recess portion;

    a second viscoelastic body made of a second viscoelastic material, said second viscoelastic body fixed in said second recess portion;

    a first cover member provided with said first recess portion and covering the whole first viscoelastic body; and

    a second cover member provided with said second recess portion and covering the whole second viscoelastic body,wherein said first viscoelastic material has a peak value temperature of the loss coefficient which is less than −

    30°

    C. and said second viscoelastic material has a peak value temperature of the loss coefficient which is not less than −

    30°

    C.,wherein said first viscoelastic material comprises one of a butyl bromide composition, an acrylonitrile-butadiene rubber, silicone rubber and styrene-based rubber, and said second viscoelastic material comprises one of a butyl bromide composition, an acrylonitrile-butadiene rubber, silicone rubber and styrene-based rubber, andwherein said first recess portion is formed in a sole portion of said head, and said second recess portion is formed in a side portion of said head.

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