Patent ID: 9586106
Date: 2017-03-07
CPC Classifications: A63B

Claim:
1. A golf club shaft comprising a plurality of fiber reinforced layers, wherein: the fiber reinforced layers are formed by a plurality of wound prepreg sheets; the sheets include: the first butt partial sheet includes a first tapered part; the second butt partial sheet includes a second tapered part; a fiber weight per unit area of the first butt partial sheet is defined as CF a fiber weight per unit area of the second butt partial sheet is defined as CF an axial-directional length of a long side of the first butt partial sheet is defined as L an axial-directional length of a long side of the second butt partial sheet is defined as L an axial-directional length of the first tapered part is defined as Lt an axial-directional length of the second tapered part is defined as Lt the golf club shaft satisfies the following formulas (1), (2), (3) and (4):