Patent ID: 6905422
Filing Date: 2005-06-14
Classification: A63B

Abstract:
1. A light-weight golf club shaft comprising, sequentially: said golf club shaft having a longitudinal axis; an inner layer; said inner layer being a first angled layer concentric with said longitudinal axis; said first angular layer having a circular cross section; a first straight layer formed on said first angled layer; said first straight layer being concentric with said longitudinal axis and having a circular cross section; a second angled layer formed on said first straight layer; said second angled layer being concentric with said longitudinal axis and having a circular cross section; a second straight layer formed on said second angled layer; said second straight layer being an outer layer concentric with said longitudinal axis and having a circular cross section; said shaft having a length along a longitudinal direction; each of said layers extend over an entirety of said length of said shaft; each of said layers includes fiber-reinforced composite material containing reinforcing fibers; said reinforcing fibers of said second angled layer being oriented at an angle relative to said longitudinal direction of said shaft; and said second angled layer having at least one of said angle and a thickness effective to provide said shaft with a torsional strength of at least 120 kgf×m×degrees and a weight of from 30 to 40 g.