Patent ID: 8827829
Filing Date: 2014-09-09
Classification: A63B

Abstract:
1. A golf club shaft comprising a plurality of layers, wherein the layers comprise a bias layer in which an absolute angle θa of a fiber to a shaft axis line is 10 degrees or greater and 70 degrees or less, and a hoop layer in which the angle θa is equal to or greater than 80 degrees; the layers comprise a full length layer disposed all over in an axis direction of the shaft, and a partial layer partially disposed in the axis direction of the shaft; the partial layer comprises a back end reinforcing bias layer and a back end reinforcing hoop layer a back end of the back end reinforcing bias layer is located at a butt end of the shaft, and a back end of the back end reinforcing hoop layer is located at the butt end of the shaft; and a torsional rigidity value GIt at a point separated by 300 mm from a butt end is 3.5×10