Bridgestone Sports Co., Ltd.

Daisuke Mikame

Hirato Shimasaki

Yasunori Imamoto

Makoto Kubota

Yuu Hasebe

Hiroshi Ezaki

Wataru Ban

Hideo Matsunaga

Masaomi Hiruta

A golf club head having a hollow construction, including a bar-like gravity adjusting piece ( ) which extends longitudinally from a toe ( ) towards a heel ( ), or vice versa, of the head and is secured directly on an inner surface of a sole portion ( ) in a position nearer to a front face ( ) or wherein a forward half area (F) of the sole portion ( ) as viewed from above, that is nearer to a face member ( ) of the head, has a thickness two or more times greater in at least a portion thereof than an average thickness of a rearward half area (R) of the sole portion, that is nearer to a back side ( ).

Golf club head

A golf club head having a hollow construction, including a bar-like gravity adjusting piece ( ) which extends longitudinally from a toe ( ) towards a heel ( ), or vice versa, of the head and is secured directly on an inner surface of a sole portion ( ) in a position nearer to a front face ( ) or wherein a forward half area (F) of the sole portion ( ) as viewed from above, that is nearer to a face member ( &prime;) of the head, has a thickness two or more times greater in at least a portion thereof than an average thickness of a rearward half area (R) of the sole portion, that is nearer to a back side ( ).

A wood club head provided with a metal shell and having a head volume of 200 cc or more, wherein the ratio (H/W) of a maximum height (H) of a face (,) acting as a hitting surface to a maximum width (W) of the face is set to be in a range of 0.65&lE;(H/W)&lE;1.0, and the area of the face is set to be not smaller than 20 cm,.

Wood club head

A golf club head having a hollow construction, including a bar-like gravity adjusting piece (,) which extends longitudinally from a toe (,) towards a heel (,), or vice versa, of the head and is secured directly on an inner surface of a sole portion (,) in a position nearer to a front face (,) or wherein a forward half area (F) of the sole portion (,) as viewed from above, that is nearer to a face member (,&prime;) of the head, has a thickness two or more times greater in at least a portion thereof than an average thickness of a rearward half area (R) of the sole portion, that is nearer to a back side (,).

A set of iron golf clubs permitting to hit a ball correctly with a positive ball catching and less pulling even when used by any average golfer, in which as the club number ascends, the center distance L between the axis 20 of club shaft and the center C of club head impact face 2 is gradually longer and the weight distributed on the heel 4 is gradually smaller while the weight distributed on the toe 3 is gradually larger.

Iron golf club set

A golf club head has a gravity depth of 27 mm or greater and a convexed face with bulge and roll radii each equal to 9 inches or less. In an embodiment, a club head has a gravity depth of 27 mm, a bulge radius in the range of 6 to 8 inches and a roll radius of 7 to 9 inches. In another embodiment, a club head has a gravity depth of 30 to 35 mm, a bulge radius in the range of 6 to 8 inches and a roll radius of 7 to 9 inches.

Growing community of inventors

Saitama-ken, Japan

Daisuke Mikame