Patent ID: 6273829
Filing Date: 2001-08-14
Classification: A63B,B22F,C22C

Abstract:
A golf shaft formed from a metal matrix composite material, said shaft comprising a handle portion, a tapered portion and a tip portion, the final dimensions of at least said tapered portion and said tip portion being re-formed from the starting dimensions of a tubular metal matrix composite material starting stock to provide a shaft with variations in wall thickness, said metal matrix composite comprising a 7XXX series aluminum alloy matrix having discontinous reinforcement particles therein, a maximum modulus of elasticity of 12.5, a minimum modulus of elasticity and a minimum yield strength being related by the equation: Y=71+6.84(E-10.4)where Y is yield strength in kilopounds per square inch and E is modulus of elasticity in millions of pounds per square inch, and wherein a minimum modulus of elasticity is no lower than 10.4 and a minimum yield strength is no lower than 71.