Tennis racket

Details Tennis racket Tennis racket

A - Human Necessities

63

B

273/163

A63B 49/10 (2006.01) A63B 49/02 (2006.01) A63B 59/00 (2006.01)

Patent

CA 1301798

ABSTRACT OF THE DISCLOSURE In a tennis racket having a frame portion and a shaft portion formed integrally with the frame portion of a fiber-reinforced plastic, the shaft portion has in a direction perpendicular to a striking area a minimum thickness at a longitudinally intermediate part thereof, the minimum thickness being between 60% and 80% of the thickness at the lower end of the shaft portion, while the frame portion has in the same direction a maximum thickness at the side portions thereof corresponding to a striking sweet spot and a minimum thickness at the top thereof, the maximum thickness being between 110% and 140% of the thickness and being between 135% and 160% of the minimum thickness whereby a time elapsed until the shaft portion reaches an initial maximum amplitude value when vibrating in the ball striking direction at an impact of a ball is approximated to a time elapsed until the side portions of the frame portion reach an initial maximum amplitude value when vibrating toward the center of the striking area at the impact.

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