Claims
- 1. In a wood-type core-shell golf club head wherein the core is made of a foamable synthetic resin and the shell is a fiber reinforced plastic, the improvement which is characterized in that the shell includes in its face side section a homogeneous mixture of a resin matrix, and a fiber mixture of long reinforcement fibers having a length of from 12.5 to 50 mm., and short reinforcement fibers having a length of 3 mm. or less, the content ratio of said long and short fibers ranging from 90 to 70% by weight of said long fibers to 10 to 30% by weight of said short fibers, the content ratio of said mixture of fibers to said resin matrix ranging from 40 to 60% by weight of said fibers to 60 to 40% by weight of said resin matrix, the said face side section structure providing a club head which effectively transmits and reduces absorption of shock at impact of the club head with a golf ball.
- 2. A wood-type core-shell golf club head according to claim 1 wherein said resin matrix is an epoxy or vinyl resin, said long fibers are carbon or carbon fibers admixed with glass fibers, and said short fibers are boron carbide, alumina, carbon, glass or silicon carbide fibers.
- 3. A wood-type core-shell golf club head according to claim 2 wherein said long fibers have a length of about 15 mm., said short length fibers have a length of about 2 mm., within a weight ratio of 80:20 weight ratio of each, and in a 50:50 weight ratio of said mixture of fibers to the resin matrix.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-24636 |
Mar 1984 |
JPX |
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Parent Case Info
This invention is a continuation-in-part of previously filed application Ser. No. 709,439, filed Mar. 8, 1985, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3598693 |
Anderson et al. |
Aug 1971 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2115295 |
Sep 1983 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
709439 |
Mar 1985 |
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