Sumitomo Rubber Industries Limited

Sri Sports Limited

Sumitomo Electric Industries, Limited

Dunlop Sports Company Limited

Gifu University

Yumi Kanemitsu

Kazuhisa Fushihara

Mikio Yamada

Naruhiro Mizutani

Hirotaka Nakamura

Tadashi Uozumi

Yuki Motokawa

Toshiaki Sakaki

Chiemi Mikura

Tetsuo Mizoguchi

Ryo Murakami

Takehiko Hyodo

Asami Nakai

Jun Nishibayashi

Akio Ohtani

Hiromasa Tsunashima

Noboru Uenishi

Toshihiko Takiguchi

Hitoshi Takii

Shinji Kikuhara

Toshinori Sakamaki

Takuzo Iwatsubo

Ayaka Hibi

Hitoshi 1-3 1-Chome Shimaya Takii

Toshihiko 1-3 1-Chome Shimaya Takiguchi

A golf club head includes a metallic head body having an opening, and an FRP member fixed to the head body so as to close the opening. The FRP member is a fiber-reinforced plastic including fibers and thermoplastic resin. The head body includes a support portion around the opening. The support portion has a first surface for supporting the FRP member. The first surface is provided with at least one narrow groove having a groove width of 20 to 80 μm and a groove depth of 100 to 400 μm, and a part of the thermoplastic resin of the FRP member is solidified inside the at least one narrow groove.

Golf club head

To provide a lightweight shaft having excellent strength, a shaft has one or a plurality of fiber reinforced resin layers. At least one of the fiber reinforced resin layers is produced by a filament winding method in which one or a plurality of fiber bundles are wound while tension is applied thereto. The fiber bundles each include a plurality of filaments. The tension applied to the fiber bundles is not less than 0.04 (gf) per filament. The tension is great. Preferably, at least one of the fiber reinforced resin layers is produced by a multi-filament winding method in which a plurality of the fiber bundles are simultaneously wound while being arranged side by side. Preferably, fibers forming the filaments are carbon fibers. Preferably, a resin composition included in each fiber reinforced resin layer is an epoxy resin composition.

Golf club shaft

The present invention provides a golf ball resin composition comprising (A) an ionomer resin component and (B) a compound having an anionic part within a molecule thereof, wherein with respect to a metal ion contained in the golf ball resin composition, (A) the ionomer resin component and (B) the compound having the anionic part within the molecule thereof, following coordinate energies obtained by ab initio molecular orbital calculation method using a basis function B3LYP/6-31G(d) satisfy the following expression: 0.3&#x2266;(A&#x2212;C)/(B&#x2212;C)&#x2266;0.6, wherein coordinate energy A is the coordinate energy between the metal ion and the anionic part of (B) component, coordinate energy B is the coordinate energy between the metal ion and the carboxyl ion of (A) component, and coordinate energy C is the coordinate energy between the metal ion and the olefin of (A) the ionomer resin component.

Golf ball resin composition and golf ball

An object of the present invention is to provide a golf ball having high resilience. The present invention provides a golf ball having a constituting member, wherein at least a part of the constituting member is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, the organic sulfur compound being derivatives of thiophenols and disulfide with a strong electron withdrawing substituent.

Golf ball

An object of the present invention is to provide a golf ball having high resilience. The gist of the present invention resides in selecting an organic sulfur compound used for a golf ball rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) the organic sulfur compound from organic sulfur compounds having specific structures such that a sum of substituent constants of the substituents X in a structure represented by the following formula (4) is 0.2 or more and SP value of the structure represented by the following formula (4) is in a range from 19.0 (J/cm)to 24.0 (J/cm)and using the same. 

Method for selecting organic sulfur compound for golf ball, method for producing golf ball, and golf ball

An object of the present invention is to provide an environmentally safe golf ball having excellent resilience. The present invention provides a golf ball having constituting members, wherein at least a part of the constituting members is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (d) an organic sulfur compound, wherein the organic sulfur compound includes a disubstituted compound of thiophenol, disulfide and/or thiophenol metal salt with Br, F or CFonly at ortho positions.

The present invention provides a solid golf ball that exhibits a high resilience performance and a high flight performance and gives a good shot feeling. The present invention relates to a solid golf ball including:

Solid golf ball

A high specific-gravity EPDM composition consisting of a mixture of EPDM containing diene at less than 4.5 wt % and ethylene at not less than 58 wt % nor more than 80 wt % and having a Mooney viscosity MLnot less than 50 nor more than 170 at 125&#xb0; C. and a powdery material, containing powder whose specific gravity is not less than 12 as a main component thereof, added to the EPDM at not less than 80 wt % nor more than 97.5 wt % of a whole amount of the high specific-gravity EPDM composition.

High-specific-gravity EPDM composition, dynamic damper made from the composition, tennis racket with the dynamic damper, and radiation-shielding material comprising the composition

A testing equipment including a first joint extending upright from a base ( ), a final joint on which a holder ( ) for holding a grip of a ball-hitting tool is installed, and an intermediate joint disposed between the first and final joints. The first, intermediate, and final joints are successively connected to each other and rotated by individual driving devices in such a way that the ball-hitting tool held by the holder installed on the final joint is swung in X, Y-, and Z-directions or/and rotated around a longitudinal axis of the ball-hitting tool held by the holder to adjust/increase or decrease a distance, between a ball-hitting plane and the base, corresponding to a motion of a person swinging his/her arm up and down, with the person gripping the ball-hitting tool, adjust/change an angle of the ball-hitting plane corresponding to an inward rotation of the arm or an outward rotation thereof, and/or adjust/change an angle between a longitudinal axis of the ball-hitting tool and the base.

Ball-batting implement testing device

A dynamic damper ( ) having a viscoelastic part ( ) and a mass-adding part ( ) laminated on the viscoelastic part ( ). The dynamic damper ( ) has a horizontal frame ( ) and a vertical frame ( ) disposed at both sides of the horizontal frame ( ) in such a way that the horizontal frame ( ) and the vertical frame ( ) continuous with the horizontal frame ( ) in the shape of a lattice. The horizontal frame ( ) and the vertical frame ( ) are integral with each other or separately provided in the shape of a lattice.

Dynamic damper and dynamic damper-installed tennis racket

A tennis racket including a vibration damping member located in the vicinity of a position of a racket frame at which a large amplitude is generated when the tennis racket hits a tennis ball. The vibration damping member includes a mass adding part, such as a bracket assembly, having a portion extending in a widthwise direction of the tennis racket and a portion extending in a thickness direction thereof such that both portions are either integral or unintegral with each other; a viscoelastic material; a spring; or/and a damper each for connecting the mass adding part to the racket frame. The vibration damping member absorbs a vibration in an in-plane and an out-of-plane direction of the racket frame, and longitudinal and rotational impacts to be applied to a handle portion of the tennis racket.

Growing community of inventors

Kobe, Japan

Yumi Kanemitsu