A - Human Necessities – 63 – B
Patent
A - Human Necessities
63
B
A63B 53/10 (2006.01) A63B 53/12 (2006.01) D04C 1/06 (2006.01)
Patent
CA 2363812
A golf club shaft has a braid layer including first and second diagonal yarns. The diagonal yarns are positioned at the degrees of orientation (+ .theta. , - .theta. ) of +30° to +60° and -30° to -60° against the longitudinal axis 13 of the shaft, respectively. The braid layer has a portion that satisfies an inequality, n~ {(t-.sigma. t) /cos .theta. } ~ .eta.~ D ~ n ~ {(t+ .sigma. t) /cos .theta. }, wherein t is the average width of the diagonal yarns, .sigma.t is the standard deviation of the width of the diagonal yarns, D is the shaft diameter, and n is the number of diagonal yarns. The braid layer satisfying the inequality minimizes spaces S between the diagonal yarns. With the shaft of the present invention, the ratio of the longitudinal modulus of the shaft during a swing to the longitudinal modulus of the shaft when the head speed is zero gradually increases along with the increase in the head speed, thus suppressing shaft's deformation caused by centrifugal force during a swing and facilitating swings of the club.
Mizuno Corporation
Oyen Wiggs Green & Mutala Llp
LandOfFree
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