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US 5,310,179 AGranted
Tennis racket
AssigneeYamaha Corporation
InventorMasanori Takatsuka
Life of this patent
Estimating the term…
Abstract
In construction of a tennis racket provided with an oval Head Frame defining a racket face, the longitudinal size (W.sub.1) of the racket face is set to a value in a range from 320 to 390 mm, the transverse size (W.sub.2) of the same is set to a value in a range from 200 to 240 mm, and the longitudinal compressive rigidity of the head frame is adjusted to a value in a range from 30 to 200 Kgf/mm. The construction thus specified allows employment of an enlarged main/cross string tension ratio which assures high degree of spin performance at shooting balls.
Claims16
A tennis racket comprising
- a substantially oval ring shaped head frame and
- a racket face constructed by a string network which is made up of interlaced main and cross strings mounted under tension to said head frame,
- said racket face having a first length (W.sub.1) in the direction of said main strings adjusted in a range from 320 to 390 mm and a second length (W.sub.2) in the direction of said cross strings adjusted in a range from 200 to 240 mm and
- said head frame having a compressive rigidity in said direction of said main strings adjusted in a range from 30 to 200 Kgf/mm.
1 more element
Dependencies are inferred from the claim text.