Bridgestone Sports Co., Ltd.

Bridgestone Tire Company Limited

Hirato Shimasaki

Hiroshi Ezaki

Daisuke Mikame

Yasunori Imamoto

Makoto Kubota

Masaomi Hiruta

Yuu Hasebe

Hidekimi Inoue

Ryohei Uji

Tetsuya Miyajima

Masami Adachi

Ikuo Aoki

Isao Nomizu

Taketo Matsuzaki

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 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

An enlarged golf club head has a front wall decreased in thickness, which is sufficient strength, easy to menufacture, and has no increase in total weight. It is a wood or iron golf club head with a plate wall made of a metal, a front side of which provides a front wall having a ball striking front face and a back face at the opposite side thereof, the back face having a plurality of ridges projecting rearwardly of the back face. The ridges extend vertically, horizontally or in both directions of the club head and are disposed at a back of at least a sweet spot of the front face.

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.

The golf club head according to the present invention comprises a head body having a cavity formed in a rear face thereof, striking face portion having a thickness less than that of a heel and toe portions, respectively, to improve the moment of inertia thereof, and a rear insert, which is made of a material of which the specific gravity is smaller than that of the material of the heel and toe portions, provided in the cavity of the head body, behind at least the sweet spot on the striking face.

A golf club head of which the face height is larger than the sole width, a so-called 'iron' club, having at least the striking face made of a copper or copper alloy or plated with a copper.

The present invention provides a golf club head made of at least a first and second head components formed integrally with each other. A metallic material of the first head component is different in kind from that of the second head component. At an anti-disjoining device such as a projection, concavity or the like is formed, as a part of the head, on all or a part of an end face of the first head component, which is to join the second head component. Further a metallic material having a melting point 200.degree. C. or more below that of the metallic material of the first head component is cast to the first head component to integrally join the end faces of the first and second head components, thereby forming the second head component.

An adhesive compound coating apparatus for coating an adhesive compound on leading and trailing beveled end faces of a rubber strip material, comprising: a conveyor unit for conveying the strip material in its longitudinal direction; a coating roller disposed to have a center axis substantially perpendicular to the longitudinal direction of the strip material and rotatable about its center axis with respect to the conveyor unit, the coating roller being movable with respect to the conveyor unit between a first position having the center axis of the coating roller positioned below the upper surface of the conveyor unit and a second position having the peripheral surface of the coating roller positioned above the upper surface of the conveyor unit; a drive unit for driving the coating roller to rotate about its center axis; an adhesive compound supplying unit for supplying and applying the adhesive compound on the peripheral surface of the coating roller; a detecting unit operative to detect the positions of the strip material conveyed by the conveyor unit and produce output signals; and a control unit responsive to the output signals delivered from the detecting unit and operative to move the coating roller between the first and second positions.

Growing community of inventors

Tokyo, Japan

Hirato Shimasaki