Golf club shaft
AssigneeDunlop Sports Co. Ltd.
InventorTatsuya Yashiki
Life of this patent
Estimating the term…
Abstract
[Object] To provide a golf club shaft that can provide a moderate rigidity and enhance an impact strength. [Solution] A shaft 6 includes full length layers s3, s4, s7, s8 and s9 provided wholly in a longitudinal direction of the shaft, and tip end partial layers s1, s2, s10, s11 and s12 provided on a tip end part of the shaft. The full length layers include bias layers s3 and s4 and straight layers s8 and s9. The tip end partial layer includes an inner glass fiber reinforced layer s1, and an outer low elastic carbon fiber reinforced layer s10 or an outer glass fiber reinforced layer s10 which is disposed outside the inner glass fiber reinforced layer s1. The low elastic carbon fiber has a tensile elastic modulus of 22 ton/mm2 or less. In the shaft 6, a shaft weight in terms of 46 inches is 55 g or less.
Claims6
A golf club shaft which has a tip end and a butt end, said shaft comprising:
- full length layers disposed wholly in a longitudinal direction of the shaft;
- and tip end partial layers disposed on the tip end of the shaft,
- wherein the full length layers include a bias layer and a straight layer;
- and the tip end partial layers include an inner glass fiber reinforced layer, and an outer low elastic carbon fiber reinforced layer which is disposed outside the inner glass fiber reinforced layer;
- wherein the reinforcing fiber of the outer low elastic carbon fiber reinforced layer is a pitch-based carbon fiber;
- the low elastic carbon fiber has a tensile elastic modulus of equal to or less than 22 ton/mm2;
- and the outer low elastic carbon fiber reinforced layer is not an outermost layer;
- and
- wherein a weight of the shaft is equal to or less than 55/46 grams per inch of shaft length.
Dependencies are inferred from the claim text.