Patent ID: 6773358
Filing Date: 2004-08-10
Classification: A63B

Abstract:
A golf club shaft having a plurality of fiber reinforced resinous layers which are layered one upon another in a winding state,wherein one or more layers of said layers are inclined fiber reinforced resinous layers in which reinforcing fibers are oriented at angles not 0Â° and 90Â° with respect to an axis of said golf club shaft, wherein the inclined fiber reinforced resinous layers are a first inclined fiber reinforced resinous layer in which reinforcing fibers are oriented at an angle of &agr;Â° with respect to an axis of said golf club shaft, wherein &agr;Â° has a value of 0Â°a second inclined fiber reinforced resinous layer in which reinforcing fibers are oriented at an angle of âˆ’&agr;Â° with respect thereto, wherein, the second inclined fiber reinforced resinous layer is adjacently layered on the first inclined fiber reinforced resinous layer in a winding state at one portion or more,a winding start position of the first inclined fiber reinforced resinous layer and a winding start position of the second inclined fiber reinforced resinous layer are spaced 180Â° in a circumferential direction of said golf club shaft, and the first inclined fiber reinforced resinous layer and the second inclined fiber reinforced resinous layer are wound by N+0.5 unintegral turns, respectively, so as to apply an anisotropic property to the shaft, wherein N is an integer of one wherein the N+0.5 turns and winding start positions of the first and the second inclined fiber reinforced resinous layer continue along an axis thereof so that same layer constructions continue along the axis of said golf club shaft of which the first and second inclined fiber reinforced resinous layers are wounded, and number of layers and thickness are the same in the golf club shaft circumferential direction.