Yamaha Corporation

Nippon Gakki Seizo Kabushiki Kaisha

Toyohiko Tadokoro

Masaki Fujimura

Yoichi Nagasaki

Itsushi Nagamoto

Tatsuo Nakanishi

In construction of a metallic gold club head having a rear side recess and a composite face situated in front of the rear side recess, the position of the composite face is biased towards the toe or heel depending on the number of the club head in order to assure stabilized course of travel traced by balls, increased distance of travel traced by balls and crisp feel at shot of balls.

Metallic golf club head

In construction of a composite type iron club head for golf having a fiber reinforcement, a synthetic resin backup is used as a substitute for the conventional ring for holding the fiber reinforcement in postion, thereby improving productivity and inertia moment of iron clud head. The fiber reinforcement, which can be of solid or hollow construction, and the synthetic resin back up are disposed in a recess provided on the side of the club head remote from the shooting surface. A mass can be adjustably imbedded in the synthetic resin backup so as to increase the inertial moment of the club head. A rise member extending upwardly from the sole face of the clud head can also be provided so that the center of gravity can be more easily adjusted. Undercuts can also be provided about the periphery of the recess to further facilitate the fixing of the fiber reinforcement within the recess and to provide additional fiber reinforcement in the peripheral sections of the club head. To further provide additional fiber reinforcement in the peripheral sections of the club head, a plano-concave surface can be provided on the side of the club head remove from the shooting surface.

Iron club head for golf

A fiber reinforcement, which can be of solid or hollow construction, and a synthetic resin back up are disposed in a recess provided on the side of the club head remote from the shooting surface. A mass can be adjustably imbedded in the synthetic resin backup so as to increase the inertial moment of the club head. A rise member extending upwardly from the sole face of the club head can also be provided so that the center of gravity can be more easily adjusted. The fiber reinforcement is relatively thin for shorter shafted golf clubs having high degrees of loft, and increases progressively to a greater thickness for longer shafted golf clubs having relatively small degrees of loft. A back plate made of a woven cloth can be provided adjacent the fiber reinforcement to aid in reinforcing the shooting surface and to withstand the tension acting across the rear of the club head upon impact. The synthetic backup can be transparent or semi-transparent to expose the esthetics of the woven cloth. Bonding tape can be provided between the fiber reinforcement and the main body and between the fiber reinforcement and the back plate to facilitate the manufacture of the club head and to minimize the shock and vibration effect caused by striking a ball.

In constructioln of a golf club head, presence of a light FRP plate located in a through opening in the face side region allows free weight assignment to other regions for ideal inertia moment adjustment. A metal layer may be provided on the FRP plate to produce a locally laminated face side construction in which thickness ratio of components can be adjusted for better feel at shooting.

Golf club head

A metallic golf club head having a rear side recess and a synthetic backing situated in the rear side recess, wherein the position of the rear side recess is selectively offset towards the toe of the golf club head in a short club and towards the heel of the golf club head in a long club so as to selectively position the center of gravity of the golf club head and thereby provide a more stabilized course of travel for a ball impacted by the golf club head, increase the distance traveled by a ball impacted by the golf club head and provide a crisp feel when a ball is impacted by the golf club head.

Set of golf clubs

An improved golf club head includes a metallic main body 1 having a face side section 2 providing a face side surface for shooting balls. A rearwardly opening gouge 3 is formed within the main body, extending to an end wall 3a provided by the face side section. An FRP plate 4 is inserted into the gouge and attached to the end wall. Presence of the light FRP plate in the face side region allows free weight assignment to other regions for ideal inertia moment adjustment and produces locally laminated face side construction in which thickness ratio of components can be adjusted for better feel at shooting.

An improved golf club head includes a metallic main body 1 having a face side section 2 providing a face side surface for shooting balls. A rearwardly opening gouge 3 is formed within the main body, extending to an end wall 3a provided by the face side section. An FRP plate 4 is inserted into the gouge and held against the end wall 3a by an open frame 5 which engages a circumferential portion of the plate 4. Presence of the light FRP plate in the face side region allows free weight assignment to other regions for ideal inertia moment adjustment and produces locally laminated face side construction in which thickness ratio of components can be adjusted for better feel at shooting.

In production of a composite type iron golf club head having a FRP (fiber reinforced plastic) backing in a rear recess, a peripheral flange to be caught by the main body is formed on the FRP backing by providing a bottom peripheral groove in the rear recess for fortified bonding of the FRP backing to the main body.

Growing community of inventors

Hamamatsu, Japan

Toyohiko Tadokoro