Hollow golf club head
First Claim
1. 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 (ρ
- m/ρ
f) of the specific gravity ρ
m of said head body and the specific gravity ρ
f of said cover member is set equal or superior to 1.3.
1 Assignment
0 Petitions
Accused Products
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.
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Citations
11 Claims
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1. 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 (ρ
- m/ρ
f) of the specific gravity ρ
m of said head body and the specific gravity ρ
f of said cover member is set equal or superior to 1.3. - View Dependent Claims (7, 8, 9, 10)
- m/ρ
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2. 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 (ρ
- m/ρ
f) of the specific gravity ρ
m of said head body and the specific gravity ρ
f of said cover member is set equal or superior to 1.3.
- m/ρ
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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 (ρ
- m/ρ
f) of the specific gravity ρ
m of said head body and the specific gravity ρ
f of said cover member is set equal or superior to 1.3. - View Dependent Claims (5, 6)
- m/ρ
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4. 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 (ρ
- m/ρ
f) of the specific gravity ρ
m of said head body and the specific gravity ρ
f of said cover member is set equal or superior to 1.3.
- m/ρ
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11. 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 (ρ
- b/ρ
c) of the specific gravity ρ
b of a portion of said head body excluding the crown portion and the specific gravity ρ
c of said crown portion is set equal or superior to 1.3.
- b/ρ
Specification