Abstract: 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.

Abstract: A metal mold for producing a wood type golf club head, including an upper metal mold member having a molding recess including a surface for molding an upper end portion of a shaft bore in a club head, a lower metal mold member having a molding recess including a surface for molding a sole of the club head, a shaft bore molding upper pin fitted firmly in the portion of the surface of the upper metal mold member which corresponds to an upper end portion of the shaft bore, so as to project to the inner side of the metal mold, and a shaft bore-molding lower pin fitted firmly in the lower metal mold member so as to project to the inner side of the metal mold, the upper and lower pins being arranged coaxially in an opposed state via a narrow clearance, the direction in which the upper and lower pins are arranged crossing perpendicularly the direction in which the joint surfaces of the upper and lower metal mold members extend.

Abstract: An iron-type golf club set includes three club groups; a long iron-type club group comprising a plurality of long iron-type clubs having lower club numbers, a middle iron-type club group including a plurality of middle iron-type clubs having medium club numbers, and a short iron club group including a plurality of short iron-type clubs having higher club numbers. The long iron-type clubs of the long iron-type club group each includes a club head which contains a sole made of a metal material and a shell having a ball-hitting face and a core which is made of a foaming material and enclosed in the shell, and the shell is made of a fiber-reinforced material. The middle iron-type clubs of the middle iron-type club group each includes a club head having a sole and an external periphery each made of a metal material and at least a ball-hitting face made of a fiber-reinforced resin. The short iron-type clubs of the short iron-type club group each includes a club head made of a metal material.

Abstract: An iron golf club set characterized in that the difference of the club lengths between at least two adjacent golf clubs in terms of the club number in a middle iron golf club group is set to be greater than the pitch difference of the club length between the club numbers in a long iron golf club group and the pitch difference of the club lengths between the club numbers in a short iron golf club group.

Abstract: A long wood-type golf club having a length of 44 inches or more when measured from the bottom of the sole portion of the club's head to the upper end of the club's shaft, the club head having the relationship h.ltoreq.H, where h is the vertical height from the bottom of the sole portion of the club head to the axial center of the upper end of the neck thereof and H is the maximum vertical height of the club head's body, the club shaft being inserted into the club head a distance of at least 35 mm.

Abstract: 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.

Abstract: 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.

Abstract: A golf club head having a main body made of synthetic resin as a main material and a sole plate of metal material molded integrally with the club head main body. The sole plate has an its bottom surface at least one projection formed independently of the sole plate and fixed thereto so that it extends in a back and forth direction relative to the direction of swing of the club.

Abstract: A golf club having a bottom plug fitted in a sole-side portion of a shaft receiving bore extending from the upper end of a club head to the lower surface of its sole plate, in which the plug has a smaller-diameter portion having an outer diameter substantially equal to the inner diameter of the club's shaft, and fitted in and bonded to the inner surface of the club shaft, and a larger-diameter portion having an outer diameter substantially equal to the inner diameter of the shaft receiving bore, and fitted in and bonded to the inner surface of the bore.

Abstract: A wood type golf club head comprising a head body consisting mainly of a synthetic resin, and a metallic sole plate bonded to the lower surface of the head body. The sole plate has on its surface to be bonded to the head body various members formed integrally therewith which include a hosel on the heel side, weights on the toe side and rear side, and a beam connecting the weights and the hosel.

Abstract: A golf club wherein at least the surface of the face of a club head made of fiber-reinforced plastic or wood or the surface of a club shaft made of fiber-reinforced plastic is covered with a cured coating layer of a silicone-modified synthetic resin.

Abstract: A golf club head having a channel formed in the back on the heel side of the club head main body that extends from the upper end of the hosel portion to the underside of a sole portion. A cover member molded separately is mounted over the opening of the channel to close it whereby a shaft fit hole is formed for receipt of the club's shaft by the inner surface of the cover member and a part of the inner surface of the channel.

Abstract: A wood-type metal golf club head comprising a hollow metal head body and a core material filling the inside of the metal head body, wherein the core material is an aggregate prepared by fusing expandable beads comprising a microcapsule of a synthetic polymer and an expanding gas enclosed therein to each other by the expansion of the gas and has a bulk specific gravity of 0.05 to 0.15 g/cm.sup.3.

Abstract: An iron golf club set characterized in that the difference of the club lengths between at least two adjacent golf clubs in terms of the club number in a middle iron golf club group is set to be greater than the pitch difference of the club length between the club numbers in a long iron golf club group and the pitch difference of the club lengths between the club numbers in a short iron golf club group.

Abstract: A golf club head made of a fiber-reinforced resin, at least the outermost layer of the face thereof being composed of a cloth-reinforcing material impregnated with a matrix resin containing whiskers mixed therein so that the edges of the scoring lines will be composed of the matrix resin containing the whiskers mixed therein.

Abstract: A wood golf club head equipped with steps which extend transversely on an upper surface of the head or a single large dimple of specific dimensions and location that extends over the rear portion of the upper surface of the club head.

Abstract: A wood-type golf club head molded from a fiber-reinforced resin having at least one fin equipped with at least one hook fixed by brazing to the inner side surface of the metal sole plate so that the fiber-reinforced resin of the head will flow into and under the hook of the fin during molding to securely bond the club head to the sole plate.

Abstract: A golf club head in which a core buried in the interior of an outer shell of a fiber reinforced resin is molded out of a molten mixture of a thermoplastic resin and powder of a metal having a high specific gravity, and a method of manufacturing such golf club heads.

Abstract: 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.

Abstract: A golf club head composed of an outer shell made of a fiber-reinforced resin and a core made of a syntactic foam and formed in the outer shell, wherein the syntactic foam comprises a matrix resin with glass microballoons as a main component and whiskers mixed therein.