Hollow golf club head
First Claim
1. A hollow golf club head comprising a hollow head body having a crown portion, a face portion, a sole portion and a neck portion, wherein all of said portions are made of metal and wherein a part of the crown portion and a part of the face portion of the head body are composed of a material different from said metal, said part of the crown portion being located on an outer surface of the crown portion and said part of the face portion being located on an inner surface of the face portion and a ratio (pb/pc) of a specific gravity pb of a portion of said head body excluding the crown portion and the face portion and a specific gravity pc of said crown portion including said part thereof is set equal to or greater than 1.3.
0 Assignments
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, 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%.
-
Citations
2 Claims
- 1. A hollow golf club head comprising a hollow head body having a crown portion, a face portion, a sole portion and a neck portion, wherein all of said portions are made of metal and wherein a part of the crown portion and a part of the face portion of the head body are composed of a material different from said metal, said part of the crown portion being located on an outer surface of the crown portion and said part of the face portion being located on an inner surface of the face portion and a ratio (pb/pc) of a specific gravity pb of a portion of said head body excluding the crown portion and the face portion and a specific gravity pc of said crown portion including said part thereof is set equal to or greater than 1.3.
Specification