The Yokohama Rubber Co., Ltd.

Kazuo Kawada

Takaharu Okumoto

Toshio Kobayashi

Tetsuo Hayashi

Heihatiro Soeda

Shinji Yamamoto

Hideyo Asabuki

Toshinori Nishimura

Shinkichi Saito

Toshio Ninomiya

Atsushi Onozato

Tadashi Miura

Tadashi Hayashida

Toshihiro Horiba

A method of producing a wood type golf club head which comprises molding and curing integrally an outer shell portion of a head main body having a hollow portion thereinside and equipped with a recess on at least one of the toe, back and heel sides thereof facing the hollow portion, from a synthetic resin as a main material, fixing a weight member having an adjustable weight into the or each recess, packing a core member into the hollow portion, and fitting a sole plate to a sole portion, and such a wood type golf club produced.

Wood type golf club head

A wood type golf club head having a crown portion in an upper part of a club head body, a sole in a lower part thereof, a face in a front side thereof, a side portion between the crown portion and sole, and a continuous ridgeline X extending from a toe side to a heel side along a boundary between the crown portion and side portion, characterized in that a height of a portion Xa of the ridgeline X on the rear side is set less than 1/4 of that H of the club head, a height of a portion Xb of the ridgeline X on the heel side being set more than 1/2 of that H of the club head, a height of remaining portions Xc, Xd of the ridgeline X being set 1/4-1/2 of that H of the club head with a total length of the last-mentioned portions Xc, Xd of the ridgeline X accounting for 60-90% of a total length of a whole ridgeline X.

A golf club set consisting of a plurality of golf clubs having a series of continuous club numbers, characterized in that an angle of centroid defined as an angle described between an extension line of a face of a club head and a perpendicular passing through a center axis of a club shaft when the club shaft of each of the golf clubs is placed on a horizontal table with the club head thereof being suspended freely, is smaller for the golf clubs having higher club numbers and progressively larger in the order of decreasing club numbers among a plurality of the golf clubs.

Golf club sets

A method of producing a wood type golf club head which comprises molding and curing integrally an outer shell portion of a head main body having a hollow portion thereinside and equipped with a recess on at least one of the toe, back and heel sides thereof facing the hollow portion, from a synthetic resin as a main material, fixing a weight member having an adjustable weight into the at least one recess, packing a core member into the hollow portion, and fitting a sole plate to a sole portion of the club head.

Method of producing wood type golf club head

An iron golf club head having a sole and a hosel molded integrally as a frame from a metallic material, a core portion disposed in an upper part above the sole and the outer periphery of the core portion and the outer periphery of the frame except for the sole are covered with a fiber-reinforced resin and a weight having a greater specific gravity than the metallic material of the frame disposed between the sole and the core portion. The weight consists of a mass of 92 to 98 wt. % of powdery tungsten mixed in a polyamide resin.

Iron golf club head made of fiber-reinforced resin

This invention relates to a wood golf club and its production method, wherein an outer peripheral surface recessed from an outer surface of a club head main body through a step is formed on a neck portion of a club head made of a fiber-reinforced resin, a long-fiber-reinforced resin layer formed by winding resin-impregnated long fibers in such a manner as to cross the axial direction of the neck portion is fitted over the outer peripheral surface, and the outer surface of the long-fiber-reinforced resin layer and the outer surface of the club head main body are at substantially the same level.

Growing community of inventors

Hiratsuka, Japan

Kazuo Kawada