Sumitomo Rubber Industries Limited

Sri Sports Limited

Takumi Nishino

Keiji Ohama

Keiji Moriyama

Hidenori Hiraoka

Kazunari Yoshida

Golf club head

Putter headhaving a head main bodyconstructed with a metal, and a member having low specific gravityconstructed with a material having a specific gravity lower than that of the metal constructing the head main body. The member having low specific gravityis provided on the sole surfaceside of the head main body. At least a part of the sole surfaceis constructed with the member having low specific gravity. Preferably, the head main bodyhas a hollow part t. Preferably, the center of gravity gof the member having low specific gravityis located to get closer to the face side than the center of gravity gof the head does. The golf putter according to the present invention has the putter head, a shaft, and a grip. The present invention provides a golf club head for a putter and a golf putter which achieve favorable rolling.

Golf club head for putter, and golf putter

A golf club head comprises a main body provided with at least two holes and detachable parts attached to said holes, the detachable parts including a weight member and a damper, the weight member having a specific gravity larger than the main body, the damper having a specific gravity different from the weight member and made of elastic material at least partially for absorbing a vibration of the main body, and the damper and the weight member being attached to the holes of the main body so that each position can be exchanged.

A headhas three regions, i.e., an anterior region Z positioned on the facemost side, a posterior region K positioned on the backmost side, and a joint region R positioned between the anterior region Z and the posterior region K, which are provided to divide the putter head equally in the face-to-back direction. The anterior region Z has an anterior thick part Zhaving a thickness of equal to or greater than 20 mm. The joint region R has a thin parthaving a thickness of equal to or less than 7 mm. The posterior region K has a posterior thick part Khaving a thickness of greater than 7 mm. The joint region R has a full-width partformed by making the full width of this joint region to correspond to the thin partProvided that the length of the headin the face-to-back direction is A, the length of the full-width partin the face-to-back direction is equal to or greater than (A/6).

Putter head

The present invention provides a multi-piece solid golf ball comprising a core consisting of an inner core and an outer core, and one or more layers of cover, wherein the inner core has a diameter of 30 to 39.5 mm and a center hardness in JIS-C hardness of 55 to 70, and is formed from press molded rubber composition comprising polybutadiene, a co-crosslinking agent, an organic peroxide and a filler, and the JIS-C hardness at a distance of 15 mm from the center point of the inner core is higher than the center hardness by 5 to 20; the outer core has a thickness of 0.3 to 2.0 mm and a surface hardness in JIS-C hardness of 75 to 90, and is formed from press molded rubber composition, and the surface hardness of the outer core is higher than the center hardness of the outer core is higher than the center hardness of the inner core by 10 to 35; and the cover contains thermoplastic resin as a base resin, and the outmost cover layer has a thickness of 1.5 to 2.5 mm and a surface hardness in Shore D hardness of 64 to 72.

Multi-piece solid golf ball and method of making the same

A golf ball formed with half metal molds having stable flying ability without dispersion, regardless of hitting point on surface of the ball. A parting line is latitude 0.degree., two pole portions are latitude 90.degree., an area of which latitude is 0.degree. to 17.degree. is a parting line vicinity, an area of which latitude is more than 17.degree. and less than 62.degree. is a shoulder portion, an area of which latitude is 62.degree. to 90 .degree. is a pole vicinity. And, when X represents total volume of dimples which belong to the parting line vicinity, Y represents total volume of dimples which belong to the pole vicinity, and Z represents total volume of dimples which belong to the shoulder portion, X/Z is set to be 0.58 to 0.72, Y/Z is set to be 0.22 to 0.30, and Y/X is set to be 0.35 to 0.48.

Growing community of inventors

Kobe, Japan

Takumi Nishino