Hollow golf club head
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsNorihiko Nakahara, Tomoaki Mori, Masahiko Miyamoto
Life of this patent
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Abstract
A hollow golf club head allowing to increase the repulsion and the degree of design freedom, while maintaining the durability. A hollow golf club head having a head body formed from a metal, wherein a hole is formed in the vicinity of the middle of a crown portion in the head body, the hole is closed with a cover member made of a material different from the head body, the ratio (ρm/ρf) of the specific gravity ρm of the head body and the specific gravity ρf of the cover member is set equal or superior to 1.3, and the ratio of the face area of a portion where the reinforcement and the head body are combined to the face area of the head body is set equal or superior to 20%.
Claims7
A hollow golf club head comprising a hollow head body having a hollow space and formed from a metal, a hole formed in the vicinity of the middle of a crown portion of said head body, said crown portion having a peripheral edge extending around said hole, a flange over the hollow space and extending continuously all around the peripheral edge of said crown portion, and a cover member made of a material different from said head body that continuously overlaps said flange and closes said hole, wherein a ratio (ρm/ρf) of the specific gravity ρm of said head body and the specific gravity ρf of said cover member is set equal to or greater than 1.3, a face portion of said head body is laminated with a reinforcement made of a fiber reinforced plastic, and the ratio of the face area of a portion where said reinforcement and said head body are combined to the face area of said head body is set equal to or greater than 20%.
Dependencies are inferred from the claim text.