Mizuno Corporation

Other

Kiyotaka Chaen

Isamu Toshinari

Tomomi Watanabe

Mamoru Saraie

Mototaka Iwata

Harry B Taylor

Koryo Miura

Motokaka Iwata

Kenji Kanegawa

Perimeter-weighted back portion with an integrated trapezoidal weight portion for an iron golf club

Perimeter-weighted golf club back with integrated trapezoidal weight

A groove is provided a surface on a cavity portion side of a sole portion in a head portion of an iron golf club, and a thickness of a ball hitting portion in a face portion is made larger than a thickness of a top edge side portion of the face portion and at least as large as a thickness of a sole side portion of the face portion. In a golf club set according to the present invention, the groove has the greatest depth in a long iron golf club, while the groove has the smallest depth in a short iron golf club or no groove is provided in the short iron golf club.

Iron golf club and golf club set

Golf club iron head

Weight portion for a golf club iron head

A golf club according to the present invention comprises a face portion ( ) and a neck portion ( ), and metal flow lines ( ) continue from the face portion ( ) to the neck portion ( ). These metal flow lines ( ) extend in a single direction on the face portion ( ). A method of manufacturing a golf club according to the present invention comprises steps of bending a rod member subjected to drawing plastic working on an end and forging the rod member after the bending for integrally molding a face portion ( ) and a neck portion ( ).

Golf club and method of manufacturing the golf club

The golf club shaft according to the present invention is provided with a pseudo-cylindrical concave polyhedral shell structure composed of triangles or trapezoids on the entire outer circumferential surface or on a part of the outer circumferential surface. With this structure of the golf club shaft, the degradation in the mechanical strength and the increase in the material cost are prevented. At the same time, a lighter weight golf club shaft can be produced while a greater degree of freedom is allowed in designing the characteristics such as bending stiffness distribution, a kick point position, bend point, etc. upon designing the golf club shaft.

Golf club shaft

Golf club head

Growing community of inventors

Osaka, Japan

Kiyotaka Chaen