Golf club shaft and golf club using the same
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United States of America Patent
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Jan 30, 2018
Issued Date -
N/A
app pub date -
Dec 6, 2013
filing date -
Dec 6, 2013
priority date (Note) -
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Abstract
A golf club shaft formed by winding prepregs, made of reinforced fibers impregnated with a thermosetting resin, into layers and thermally curing the prepregs. The golf club shaft includes a 90-degree prepreg, a fiber direction of which is orthogonal to a longitudinal direction of the golf club shaft and which is provided on each of an inner layer side and an outer layer side, and the golf club shaft satisfies the following condition: 2.0≦D2/D1≦4.0, wherein D1 designates a thickness of the inner-layer-side 90-degree prepreg, and D2 designates a thickness of the outer-layer-side 90-degree prepreg.
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