Patent ID: 6454662
Filing Date: 2002-09-24
Classification: A63B,Y10S

Abstract:
A golf club shaft, comprising:a tip section defining a length, a distal end, a proximal end and a longitudinal axis; a grip section defining a length, a distal end, a proximal end, a longitudinal axis, a distal portion outer surface slope and a distal end circumference; a main body section extending from the proximal end of the tip section and defining a length, a longitudinal axis, a proximal end, a proximal portion outer surface slope and a proximal end circumference that is greater than the distal end circumference of the grip section; and a stiffness control section, between the proximal end of the main body section and the distal end of the grip section, defining a length, a longitudinal axis and at least one of a substantially constant and a slightly tapered wall thickness, the stiffness control section including at least a first tapered portion defining a distal end, a proximal end, a circumference and an outer surface slope different than the distal portion outer surface slope of the grip section, and a second tapered portion defining a distal end, a proximal end, a circumference, and an outer surface slope different than the outer surface slope of the first tapered portion and the outer surface slope of the main body section proximal portion, the second tapered portion abutting the first tapered portion to define an intersection and the second tapered portion being located between the main body section and the first tapered portion, the circumference of the intersection of the first and second tapered portions being greater than the circumference of the distal end of the grip section; wherein the sum of the tip section length, grip section length, main body section length and stiffness control section length defines a shaft length, and the stiffness control section length is between about 2% and about 12% of the shaft length.