Golf club shaft

Details Golf club shaft Golf club shaft

2006-05-23

2006-05-23

Blau, Stephen (Department: 3711)

Games using tangible projectile

Golf

Club or club support

Reexamination Certificate

active

07048645

ABSTRACT:
A golf club shaft whose outer diameter is set to 9.5 to 12 mm in at least one portion of a range from a tip thereof to a position located at 25% of the distance from the tip to its butt. The minimum value of a flexural rigidity (EI) is set to 1.00 to 2.50 kg·m2. A reinforcing layer is formed in the region disposed from the tip to the position located at about 25% of the distance from the tip to the butt. The layer includes at least one straight layer whose reinforcing fiber has a tensile modulus of elasticity of 5 to 15 ton/mm2and is parallel with an axis of the shaft and one angular layer whose reinforcing fiber has a tensile modulus of elasticity of 24 to 40 ton/mm2and an orientation angle of ±20 to 65°.

REFERENCES:
patent: 5265872 (1993-11-01), Tennent et al.
patent: 6056648 (2000-05-01), Kusumoto et al.
patent: 6110056 (2000-08-01), Yamamoto
patent: 6273830 (2001-08-01), Takemura et al.
patent: 9-234256 (1997-09-01), None
patent: 2000-263653 (2000-09-01), None

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