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Golf clubhead with a high polar moment of inertia

  • US 4,898,387 A
  • Filed: 12/27/1988
  • Issued: 02/06/1990
  • Est. Priority Date: 12/27/1988
  • Status: Expired due to Fees
First Claim
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1. A golf clubhead comprising:

  • a. a toe and heel, a front and rear, and a top and sole with an elongated ball striking surface toward said front;

    b. a fastening means to affix a shaft between said heel and said toe;

    c. a geometric center of said striking face, and a vertical axis through said geometric center;

    d. a toe section and a heel section;

    e. a body casting of a material having a predetermined lower density, said body casting comprising in said toe section a portion of said elongated ball striking surface, and at least one toe cavity; and

    f. said toe section of said head from a plane perpendicular to the length line of said head through said geometric center to the extreme of said toe comprising;

    i. a toe weight means comprising at least one toe weight attached to said clubhead in said toe cavity, whereby each of said toe weights is of a material having some predetermined higher density greater than said predetermined lower density of said body casting;

    ii. a mass distribution means to decrease the relative mass consisting of said body casting and said toe weight means in the region of said toe section near the center of mass of said clubhead and to position a most substantial portion of the mass of said toe weight means adjacent said toe behind said ball striking surface; and

    iii. a characteristic feature of said most substantial portion of said toe weight means adjacent said toe comprising a relatively thin expanded surface whereby both the width and the height of said toe weight means are generally greater than the length of said relatively thin expanded surface to resist twisting forces when a golf ball is struck.

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