Sri Sports Limited

Dunlop Sports Company Limited

Sumitomo Rubber Industries Limited

Daicel Chemical Industries, Ltd.

Akio Yamamoto

Seiji Hayase

Kenji Tagashira

Masahide Onuki

Naruhiro Mizutani

Hiroshi Hasegawa

Daisuke Kohno

Tetsuo Yamaguchi

Fumikazu Yamashita

Masaru Kono

Hideaki Kawamatsu

Takeshi Takahori

Mitsushige Idei

A method of manufacturing a golf club head enables increased moment-of-inertia and improved durability. The golf club head's crown portion has a first region having a first thickness and multiple second regions having a second thickness that is smaller than the first thickness. The second regions are distributed in a radiating fashion so as to extend from an origin toward a peripheral portion of the crown portion excluding the face side, the origin being located within 15 mm of the center of gravity of the golf club head in the toe-heel direction and also being located in the vicinity of the face side in the face-back direction in a plan view.

Golf club head and manufacturing method for same

A head includes a face portion, a sole portion, and an internal weight portion provided on an inner surface of the sole portion and located apart from the face portion. The internal weight portion includes a base portion, and a protruding portion protruding from the base portion toward a face side and located apart from the inner surface of the sole portion. The protruding portion is positioned on the face side with respect to the head center of gravity. A thickness of a toe-side part of the protruding portion and/or a thickness of a heel-side part of the protruding portion is greater than a thickness of a middle part of the protruding portion. Alternatively, a middle part of the protruding portion in a toe-heel direction is absent. The internal weight portion may be formed integrally with the sole portion, or may be a different member from the sole portion.

Golf club head

A golf club head includes a head main body, and a toe-side component. The head main body includes a striking face, a hosel portion defining a shaft center line, and a mounting portion for mounting the toe-side component on a toe side with respect to the shaft center line. The toe-side component is fixed to the mounting portion removably. When the toe-side component is removed from the mounting portion of the head main body, a head projected area in a front view of the golf club head becomes smaller.

Golf club head and golf club kit

A golf club head having a hollow portion therein includes a face portion for striking a ball and defining a leading edge, a sole portion extending rearwardly of the club head from the face portion and having an inner surface thereof facing the hollow portion, a club head thickness being equal to or less than 39.0 mm. The sole portion is provided on the inner surface with a weight portion extending along the leading edge and a thin wall region between the leading edge and the weight portion. The thin wall region has a length L of from 14.0 to 23.0 mm in a head front-rear direction. The thin wall region has a ratio t/L of a maximum thickness t (mm) thereof to the length L (mm) is in a range of from 0.040 to 0.080.

The present invention provides a golf club head that enables increasing the moment of inertia while also improving durability, and a manufacturing method for the same. The golf club head of the present invention includes a crown portion. The crown portion has a first region having a first thickness and multiple second regions having a second thickness that is smaller than the first thickness. The second regions are distributed in a radiating fashion so as to extend from an origin toward a peripheral portion of the crown portion excluding the face side, the origin being located within 15 mm of the center of gravity of the golf club head in the toe-heel direction and also being located in the vicinity of the face side in the face-back direction in a plan view.

A golf club includes a club head, and a shaft. The club head includes a hosel formed into a tubular body having a top end and a shaft insertion hole extending downwardly from the top end. The shaft includes a shaft main body and a reinforcing member. The shaft main body is formed into a tubular shape having a tip end, and an internal surface surrounding cavity therein. The reinforcing member has a specific gravity of not more than 2.0 and is fixed in the cavity of the shaft main body. The reinforcing member includes a first portion fitting the internal surface of the shaft main body. The first portion includes an uppermost edge positioned upwardly with respect to the top end of the hosel, and a lowermost edge positioned between the top end of the hosel and the tip end of the shaft main body.

Golf club

A head body hincludes a recess partfor a socket. A socketis attached to the recess partfor a socket. A weight bodyis detachably attached to the socket. The weight bodycan be secured by relative rotation of an angle +&#x3b8;&#xb0;. The weight bodycan be detached by relative rotation of an angle&#x2212;&#x3b8;&#xb0;. The weight bodyincludes an engaging part. The socketincludes a first hole partand a second hole part. The engaging partcan take an engaging position EP and a non-engaging position NP at the second hole partby the relative rotations. A sectional shape of the engaging parthas N-fold rotation symmetry. N is an integer of 1 or greater and 3 or less.

Golf club head with removable weight

A golf club gc includes a head hd, a shaft sf, a sleeve sv, and a screw sc. The sleeve sv is secured to a tip part of the shaft sf. The sleeve sv includes a plurality of engaging projections svand non-engaging surfaces sv, each of the non-engaging surfaces svpositioned between the engaging projections svadjacent to each other. A hoselof the head hd includes an engaging recessextending downward from a hosel end face, and a hosel hole h. Rotation of the sleeve sv to the head hd is regulated by engagement between the engaging projection svand the engaging recess. A space is formed between an inner surface of the hosel hole hand the non-engaging surface svin the connected state.

A golf clubincludes a head, a shaft, a sleeve, and a screw. The sleeveis fixed to a tip part of the shaft. The headhas a head bodyand an engaging member. The engaging memberis fixed to the head body. Rotation of the sleeveto the headis regulated based on engagement between the sleeveand the engaging member. Withdrawal of the sleevefrom the headis regulated based on connection between the sleeveand the screw. The head bodyhas a screw part. The engaging memberhas a screw part. The screw part of the head bodyis connected to the screw part of the engaging member

A method for manufacturing a headincludes the steps of: Preferably, the guide core gcis made of a water-soluble material. Preferably, at least one of the head components Ph is produced by a press process. Preferably, the guide core gchas a lack part Ms. Preferably, existence of the lack part Msavoids contact between a welding joint part wdand the guide core gcin the step B.

Method for manufacturing golf club head

A golf club headis provided with a head body hand a CFRP member. The CFRP memberconstitutes at least a part of a crownor at least a part of a sole. The CFRP memberhas a UD lamination parthaving laminated UD layers. Orientation of a fiber is substantially set to three directions in the UD lamination part. When the three directions are a first direction, a second direction, and a third direction, preferably, an angle of the second direction to the first direction is substantially +60 degrees, and an angle of the third direction to the first direction is substantially &#x2212;60 degrees. Preferably, the UD lamination parthas a lamination symmetrical property in a fiber orientation angle. Preferably, the number of layers of the UD lamination partis 5 or greater and 12 or less.

A headincludes a head body h1, a socket, and a weight body. The weight bodyhas an engaging part. The sockethas a first hole partand a second hole part. The engaging partcan take an engaging position EP and a non-engaging position NP in the second hole partby relative rotation of an angle &#x3b8;. Hardness Hs of the second hole partis D40 or greater and D58 or less. The second hole parthas a resistance surfaceelastically deformed in the middle of the relative rotation. A longest sectional size of the engaging partis defined as d1, and a distance between the resistance surfacesopposed to each other is defined as F1, a ratio (F1/d1) is 0.935 or greater and 0.965 or less.

A golf club head () has a hollow structure provided on a heel side thereof with a hosel portion () having a shaft inserting hole. The hollow structure comprises a main frame (A) made of at least one kind of metal material and a rear casing (C) made of a fiber reinforced resin and fixed to the main frame. The main frame comprises: the hosel portion; a front section () extending from the hosel portion toward a club face (A) for hitting a ball and toward a toe side of the golf club head; and a rear section () extending from the hosel portion toward a back face of the golf club head and toward the toe side of the golf club head while keeping a distance (L) in the front-back direction of the golf club head from the front section ().

Growing community of inventors

Kobe, Japan

Akio Yamamoto