Hollow golf club head
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsNorihiko Nakahara, Shinji Yamamoto, Yoh Nishizawa, Tomoaki Mori
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, and 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.
Claims11
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 said head body, the hole is closed with a cover member made of a material different from said head body, and the ratio (ρm/ρf) of the specific gravity ρm of said head body and the specific gravity ρf of said cover member is set equal or superior to 1.3.
A hollow golf club head having a head body formed from a metal, wherein holes are formed respectively in the vicinity of the middle of a crown portion and a sole portion in said head body, each of the holes is closed. with a cover member made of a material different from said head body, and the ratio (ρm/ρf) of the specific gravity ρm of said head body and the specific gravity ρf of said cover member is set equal or superior to 1.3.
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 said head body, a flange spreading over a hollow space is formed at least on a part of the peripheral edge of said crown portion, the hole is closed with a cover member made of a material different from said head body, and the ratio (ρm/ρf) of the specific gravity ρm of said head body and the specific gravity ρf of said cover member is set equal or superior to 1.3.
A hollow golf club head having a head body formed from a metal, wherein holes are formed respectively in the vicinity of the middle of a crown portion and a sole portion in said head body, a flange spreading over a hollow space is formed at least on a part of the peripheral edge of said crown portion, another flange spreading under the hollow space is formed at least on a part of the peripheral edge of said sole portion, each of the holes is closed with a cover member made of a material different from said head body, and the ratio (ρm/ρf) of the specific gravity ρm of said head body and the specific gravity ρf of said cover member is set equal or superior to 1.3.
A hollow golf club head, wherein at least a part of the crown portion is composed of a material different from a head body thereof, and the ratio (ρb/ρc) of the specific gravity ρb of a portion of said head body excluding the crown portion and the specific gravity ρc of said crown portion is set equal or superior to 1.3.
Dependencies are inferred from the claim text.