Tennis racket
AssigneeSRI Sports Limited
InventorsTakeshi Ashino, Kunio Niwa
Life of this patent
Estimating the term…
Abstract
In a tennis racket having a racket frame composed of a fiber reinforced resin, the moment of inertia Ic of the tennis racket in a center direction thereof is set to not less than 13000 g·cm2 nor more than 17000 g·cm2, the moment of inertia Ig around a center of gravity thereof is set to not less than 80000 g·cm2 nor more than 200000 g·cm2, and the moments of inertia Ic and Ig are so set as to satisfy a relationship expressed by [30×(Ic)−(Ig)]/10000≧31.
Claims7
A tennis racket comprising a racket frame composed of a fiber reinforced resin, wherein a moment of inertia Ic of said tennis racket in a center direction thereof is set to not less than 13000 g·cm2 nor more than 17000 g·cm2;
- a moment of inertia Ig thereof around a center of gravity thereof is set to not less than 80000 g·cm2 nor more than 200000 g·cm2;
- and said moments of inertia Ic and Ig are so set as to satisfy a relationship expressed by [30×(Ic)−(Ig)]/10000≧31.
Dependencies are inferred from the claim text.