Shaft for golf clubs and golf club

Details Shaft for golf clubs and golf club Shaft for golf clubs and golf club

2007-04-06

2008-09-23

Blau, Stephen L. (Department: 3711)

Games using tangible projectile

Golf

Club or club support

Reexamination Certificate

active

07427240

ABSTRACT:
Each point obtained by plotting flexural rigidity EI measured at ten sites on a shaft is defined as from T(1) to T(10) in this order from the head side, and the formula representing a line K that passes the T(1) and the T(10) is [Y=aX+b1]. The values at the Y-intercepts on the lines that are parallel to the line K and that pass the points of from T(2) to T(9), respectively, are defined as from b2to b9, respectively, and the minimum value among the values at the Y-intercept b2to b9is defined as bmin. In this shaft, slope “a” of the line K is 0.04 or greater and 0.06 or less; any one of the b3, b4, b5, b6, b7and b8is smaller than b1; and the bmin is any one of b4to b7. The value (b1−bmin) is 24 (N·m2) or greater and 35 (N·m2) or less, and the value (b9−b1) is 0 or greater and 10 (N·m2) or less. This shaft achieves excellent flight distance performance and directionality of the hit ball.

REFERENCES:
patent: 5439219 (1995-08-01), Vincent
patent: 6117021 (2000-09-01), Crow et al.
patent: 6322458 (2001-11-01), Kusumoto et al.
patent: 6485376 (2002-11-01), Hisamatsu
patent: 6652389 (2003-11-01), Hisamatsu et al.
patent: 2000-254264 (2000-09-01), None
patent: 2003-169871 (2003-06-01), None
patent: 2005-034550 (2005-02-01), None

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