Sri Sports Limited

Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Dunlap Sports Co. Ltd.

Hitoshi Oyama

Kazuyoshi Shiga

Toshiyuki Tarao

Kuniyasu Horiuchi

Hidetaka Inoue

Hiroshi Hasegawa

Chiemi Mikura

Sho Goji

An object of the present invention is to provide a grip for sporting goods containing an acrylonitrile-butadiene based rubber as a base rubber and having an excellent grip performance and sustainability of grip performance under a wet condition. The present invention provides a grip for sporting goods comprising an outermost surface layer formed from a surface layer rubber composition, wherein the surface layer rubber composition contains (A) a base rubber and (B) a resin having a softening point in a range from 5&#xb0; C. to 120&#xb0; C., (A) the base rubber contains an acrylonitrile-butadiene based rubber, and (B) the resin is at least one type selected from the group consisting of a hydrogenated rosin ester, a disproportionated rosin ester, an ethylene-vinyl acetate copolymer, a coumarone resin, a phenol resin, a xylene resin and a styrene resin.

Grip for sporting goods and golf club

An object of the present invention is to provide a golf club grip having excellent adhesion between the grip body and the grip end thereof, and excellent durability. The present invention provides a golf club grip comprising a cylindrical grip body having a cylindrical inner layer and a cylindrical outer layer covering the cylindrical inner layer, and a grip end provided on an butt side end of the cylindrical grip body, wherein the cylindrical outer layer is interposed in at least a part of a space between a butt side end edge of the cylindrical inner layer and the grip end.

Golf club grip, golf club and method for producing golf club grip

An object of the present invention is to provide a golf club grip showing a good feeling both at hitting and at waggling. The present invention provides a golf club grip comprising a cylindrical portion for inserting a shaft, wherein the cylindrical portion has a compression strain in a range from 46% to 55% at a compression stress of 20 kg/cm, and a compression strain in a range from 63% to 69% at a compression stress of 120 kg/cm.

Golf club grip and golf club

An object of the present invention is to provide a golf club grip excellent in grip performance in a wet condition. The present invention provides a golf club grip formed from a rubber composition comprising a base rubber and a crosslinking agent, wherein the base rubber comprises a hydrogenated acrylonitrile-butadiene rubber and/or a carboxyl-modified acrylonitrile-butadiene rubber.

An object of the present invention is to provide a grip for sporting goods excellent in tensile strength and having a light weight. The present invention provides a grip for sporting goods comprising a cylindrical portion composed of a cylindrical inner layer and a cylindrical outer layer covering the cylindrical inner layer, wherein the cylindrical inner layer is a porous rubber layer or a porous resin layer, and the cylindrical outer layer is formed from a rubber composition containing an acrylonitrile-butadiene based rubber.

An object of the present invention is to provide a golf club grip comprising a layer containing a polar rubber and a layer containing a nonpolar rubber, and excellent in tensile strength. The present invention provides a golf club grip comprising a polar rubber layer and a nonpolar rubber layer, wherein the polar rubber layer is formed from a rubber composition containing a base rubber including a polar rubber in an amount of 50 mass % or more, the nonpolar rubber layer is formed from a rubber composition containing a base rubber including a nonpolar rubber in an amount of 50 mass % or more, the polar rubber layer and the nonpolar rubber layer are laminated via an interlayer formed from an interlayer composition containing an olefin rubber.

A golf clubis provided with a headhaving a hosel holeand a shaft. The golf clubhas a mounting/detaching mechanism detachably mounting the headand the shaftto each other. The mounting/detaching mechanism can fix the shaftto the hosel holeof the headat a plurality of circumferential mounting positions. The shafthas anisotropy producing coupled deformations of bending and torsion. Preferably, an angle &#x3b8;1 between an axis line of the shaftand an axis line of the hosel holeis 0 degree. Preferably, a bending torsional amount of the shaftis equal to or greater than 0.5 degree.

Golf club

A hollow wood-type golf club head with stable flight direction and flight distance performances, the club head having a moment of inertia Ix 4,000 to 5,900 g&#xb7;cmabout a vertical axis passing through the club head's center of gravity, and comprising a face with face bulge and face roll such that the radius of curvature Rx of the face bulge is from 12 to 25 inches, and the Ry/Rx ratio of the radius of curvature Ry of the face roll to the radius of curvature Rx of the face bulge is 0.50 to 0.90.

Wood-type golf club head

In a golf club head, a horizontal direction oriented from the toe side toward the heel side is defined as an X direction, while a vertical upward direction is defined as a Y direction; and the coordinate of the center of the hit face is defined as (0, 0); the coordinate of the sweet spot is defined as (x1, y1); and the coordinate of the maximum resilience point on the hit face is defined as (x2, y2). In this golf club head, x1 is +3 mm or greater and +8 mm or less, and x2 is &#x2212;5 mm or greater and +2 mm or less. Preferably, the shortest distance Dbetween the axis line of the shaft hole and the center of gravity G of the head is 33 mm or greater and 44 mm or less. Preferably, when the face member is divided into a toe portion and a heel portion by a plane that passes the center of the hit face along the Y direction, the area mean thickness Tt of the toe portion is smaller than the area mean thickness Th of the heel portion.

Golf club head

A wood-type golf club head has a volume V (cc) of not less than 350 cc and a club face area S (sq.cm) of not less than 30 sq.cm but not more than V&#xd7;0.08+5. Preferably, the weight of the face portion is in a range of from 20 to 40% of the overall weight of the club head, and the overall weight is in a range of from 150 to 210 grams.

A golf club head has a hollow shell structure comprising: a main frame provided with three independent openings which are a front opening, a top opening and a bottom opening; a face plate covering the front opening; a crown plate covering the top opening; and a sole plate covering the bottom opening. The specific gravity Gc of the crown plate, the specific gravity Gf of the face plate and the specific gravity Gs of the sole plate are each smaller than the specific gravity Gm of the main frame. Preferably, the specific gravity Gc is smaller than the specific gravity Gf and smaller than the specific gravity Gs, and the main frame is made of a metal material. Therefore, the freedom of designing the center of gravity the club head can be increased.

A wood-type hollow golf club head comprises a face having a specific thickness distribution, wherein average thicknesses tUTP, tUCP, tUHP, tMTP, tMCP, tMHP, tLTP, tLCP and tLHP of an upper toe portion UTP, upper central portion UCP, upper heel portion UHP, middle toe portion MTP, middle central portion MCP, middle heel portion MHP, lower toe portion LTP, lower central portion LCP, and lower heel portion LHP, respectively, of the face satisfy the following conditions: (a) tUTP&#x3c;tUCP&#x3e;tUHP; (b) tMTP&#x3c;tMCP&#x3e;tMHP; (c) tLTP&#x3c;tLCP&#x3e;tLHP; (d) tUTP&#x3e;tMTP&#x3c;tLTP; and (e) tUHP&#x3e;tMHP&#x3c;tLHP, and further, in the above nine average thicknesses, (f) the largest average thickness is 2.8 to 3.5 mm; and (g) the smallest average thickness is 1.6 to 2.3 mm.

Wood-type hollow golf club head

A wood golf club () which is not less than 44 inches in a length thereof and whose head () is not less than 190 g in a weight thereof. The value of a ratio of a rigidity value EIt at a position spaced at an interval of 130 mm from a head-side front end of a shaft () of the golf club () to a rigidity value EIb at a position spaced at an interval of 250 mm from a grip-side rear end of the shaft () is set to not less than 0.50.

Golf club shaft

A golf club comprises a club shaft having a tip end and a butt end, a club head being attached to the tip end of the club shaft, and a golf grip being attached to a region of the club shaft extending from the butt end toward the tip end of the club shaft, the grip having an end by the side of the butt end of the club shaft, wherein the club head has an moment (M) of inertia around a center line of the club shaft of not less than 6500 g&#xb7;cm, and the club shaft has a bending stiffness (E) of not less than 5.0&#xd7;10kgf&#xb7;mmat the position which separates 200 mm from the end of the grip toward the club head.

A reference state is envisioned in which a golf club is placed on a horizontal plane P with a predetermined lie angle and face angle, and the shaft axis line thereof is disposed within a reference plane that is perpendicular to the horizontal plane P. A center of gravity of the head G is positioned on the back side of the head from the reference plane, and a depth of the center of gravity D that is a distance between the reference plane and the center of gravity of the head G is 20 mm or greater and 30 mm or less. The golf club has a flexural rigidity value EIt (kgf&#xb7;mm) of the shaft at a position T140 mm away from the tip on the head side being 0.5&#xd7;10or greater and 1.75&#xd7;10or less. More preferably, a value of a ratio (GIt/EIt) of the flexural rigidity value EIt to a torsional rigidity value GIt of the shaft at a position 140 mm away from the tip on the head side is specified to be 0.8&#xd7;10or greater and 1.2&#xd7;10or less.

Growing community of inventors

Kobe, Japan

Hitoshi Oyama