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Golf club head

  • US 7,137,905 B2
  • Filed: 12/03/2003
  • Issued: 11/21/2006
  • Est. Priority Date: 12/19/2002
  • Status: Expired due to Fees
First Claim
Patent Images

1. A wood-type golf club head, which comprises:

  • a face portion forming a hitting face hitting a ball;

    a crown portion extending from an upper edge of the hitting face and forming an upper surface of the head;

    a sole portion extending from a lower edge of the hitting face and forming a bottom surface of the head;

    a side portion extending between the crown portion and the sole portion from a toe side edge of the hitting face to a heel side edge of the hitting face through a back face; and

    a neck portion formed with a shaft insertion hole to which one end of a shaft is attached, whereinin a measuring state where an axial center line of the shaft insertion hole is arranged in a vertical plane and is inclined at a lie angle β

    determined in accordance with the head, and a face angle is set to zero,a point at which the axial center line of the shaft insertion hole crosses a virtual plane passing through an upper end surface of the neck portion is set to an origin O, and a two-dimensional X-Y coordinate in which a Y-axis is a nodal line between the horizontal plane and the vertical plane, and an X-axis is an axis line passing through the origin O and being perpendicular to the Y-axis is virtually set on the horizontal plane passing through the origin O, andin the case where the maximum value of the Y-axis in a profile line of the head projected on the X-Y coordinate system is set to ym and the maximum value of the X-axis is set to xm, a weight member having a great specific gravity is firmly attached to the sole portion in an area where a center of gravity of the weight member is set to 0.2 to 0.7 times of the xm value in the X-coordinate and set to 0.1 to 0.5 times of the ym value in the Y-coordinate,wherein the specific gravity is in the range of from 6.0 to 25.0,the weight member is mounted in a concave portion formed on the sole portion, and the golf club head satisfies the following three conditions in a moment M of inertia around a center line of a shaft axis (g·

    cm2) and a depth L of center of gravity (mm);


    5950 ≦

    M≦

    7000;





    (1)
    30 ≦

    L ≦

    50; and





    (2)
    M≦

    (200×

    L)−

    2000. 



    (3)

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