Other

Sri Sports Limited

Sumitomo Rubber Industries Limited

Hisashi Kakiuchi

Masahide Onuki

Akihisa Inoue

Yoshishige Takano

Masaya Tsunoda

Masahide Ohnuki

Hiroto Setokawa

A hollow golf club head comprises: a face portion whose front face defines a club face for hitting a ball; a crown portion intersecting the club face at the upper edge thereof; and a sole portion intersecting the club face at the lower edge thereof, wherein at least one of the sole portion and the crown portion is provided along the front edge thereof with a face-backing zone in which the rigidity is gradually increased from its toe-side end and heel-side end toward the center thereof.

Golf club head

A golf club head in which a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with an vibrator method is between 600 and 1200 (Hz), and a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by making the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 (Hz).

A wood-type golf club head comprises a club face provided with a high-resilience part whose Young's modulus E is in a range of from 40 to 80 GPa. The head volume is in a range of from 270 to 420 cc. The horizontal inertial moment is in a range of from 3000 to 4500 (g&#xb7;sq.cm), and the gravity point depth is in a range of from 15 to 25 mm.

Wood-type golf club head

A golf club head comprises a face part defining a face for striking a golf ball, and at least a part of the face part made of an alloy satisfying the following three conditions: (1) the alloy is composed of at least three different metallic elements whose group numbers in the periodic system are at least two consecutive numbers; (2) a difference in the atomic radius between at least two of said at least three different metallic elements is not less than 10%; and (3) the heat of mixing of the element that is the major component of the alloy and at least one of the remaining components or the remaining component is not less than &minus;10 kcal/mol.

A metal mold for manufacturing amorphous alloy. A metal mold is composed of a lower mold having a portion for fusing metal material and a cavity portion, and an upper mold working with the lower mold which presses molten metal in the portion for fusing metal material and pours the molten metal into the cavity portion to mold. And, surface roughness of a part of or all of an inner surface of the metal mold is arranged to be more than 12S in JIS indication.

Metal mold for manufacturing amorphous alloy and molded product of amorphous alloy

A metal mold is composed of a lower mold having a portion for fusing metal material and a cavity portion, and an upper mold working with the lower mold which presses molten metal in the portion for fusing metal material and pours the molten metal into the cavity portion to mold. And, the portion for fusing metal material is composed of a material having a heat conductivity equal to or less than 250 kcal/(m&middot;h&middot;&deg; C.).

Manufacturing apparatus and method for amorphous alloy

A metal mold for manufacturing amorphous alloy. A metal mold is composed of a lower mold having a portion for fusing metal material and a cavity portion, and an upper mold working with the lower mold which presses molten metal in the portion for fusing metal material and pours the molten metal into the cavity portion to mold. And, surface roughness of a part of or all of an inner surface of the metal mold is arranged to be more than 12 S in JIS indication.

Growing community of inventors

Kobe, Japan

Hisashi Kakiuchi