Golf club head
AssigneeBridgestone Sports Co., Ltd.
InventorsHideo Matsunaga, Masashi Nishitani
Life of this patent
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Abstract
In a golf club head with a loft angle in a range of from 5 to 30 degrees, the golf club head comprises a metal body having a hollow portion and having a face portion, a thick portion is formed on the back surface of the face portion, when counted from behind the face portion to the face portion side, the thick portion has N steps (N≧2) so that a centroid of a cut surface of the first step is distanced by 1 mm or more from a centroid of the face surface, and a centroid of a cut surface of the Nth step is distanced by 1 mm or more from a centroid of a cut surface of the N-1th step. Incidentally, the cut surface of each of the steps is defined by cutting provisionally the face portion at each of the steps in parallel to a plane touching with the face surface at a face center
Claims14
A golf club head with a loft angle in a range of from 5 to 30 degrees, the golf club head comprising a metal body having a hollow portion and a face portion,
- wherein a thick portion is formed on the back surface of the face portion, the thick portion has N steps (N≧2) so that a center of the face portion including the first step is the thickest and the thick portion becoms gradually thin toward the peripheral portion thereof;
- a distance between a centroid of a cut surface of the first step and a centroid of the face surface, and a distance between a centroid of a cut surface of the Nth step and a centroid of a cut surface of the N-1th step are in a range of from 1 mm to 25% of a face length.
Dependencies are inferred from the claim text.