Golf club shaft
AssigneeI.S.T. Corporation
InventorSatoshi UEHARA
Life of this patent
Estimating the term…
Abstract
An object of the present invention is to provide a golf club shaft which is light in weight but can exhibit good durability and can suppress a decrease in flex. The golf club shaft according to the present invention has a mass within a range of 30 g or more and 60 g or less. The shaft also exhibits a flex within the range of 8 kg or more and 20 kg or less. The shaft has a durability of 1200 times or more when a golf ball is hit at a head speed of 38 m/s with a head attached to the tip of the shaft having a mass less than 45 g, and the shaft has a durability of 1800 times or more when the golf ball is hit at a head speed of 44 m/s with the head attached to the tip of the shaft having a mass 45 g or more.
Claims7
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A shaft of golf club,
- wherein the golf club shaft is formed by laminating
- a first prepreg including a first fiber in a range from 20 g/m2 to 100g/m2 , the first prepreg being continuously wound two or more times such that an orientation angle of the first fiber is in a range from 80° to 100°;
- a second prepreg including a second fiber having a fiber elastic modulus in a range from 350 GPa to 800 GPa, the second prepreg being wound outside the first prepreg so as to be adjacent to the first prepreg such that an orientation angle of the second fiber is in a range from ±30° to ±40°;
- and
- an outermost prepreg including a third fiber having a fiber breaking elongation in a range from 1.5% to 3.0%, the outermost prepreg being wound outside the second prepreg such that an orientation angle of the third fiber is in a range from −5° to 5°.
Dependencies are inferred from the claim text.