TENNIS-RACKET Russian patent published in 2007 - IPC A63B51/12 

FIELD: sportive equipment.

SUBSTANCE: tennis-racket has strain sensors positioned on racket rim symmetrically to its longitudinal axis. Information system providing receiving, processing, storage and transmission of information from strain sensor on state of racket string surface is placed within handle. Display, buttons and electrical socket are positioned on racket end. Piezoelectric inserts for additional charging of accumulators and for enabling suppression and harmonizing of racket vibrations after striking of ball are positioned on racket at places exposed to power strains upon striking of ball. At least four strain sensors may be positioned on racket rim. Racket may be further equipped with speaker for obtaining of sound signals indicative of state of racket string surface.

EFFECT: increased operational efficiency by providing data on state of racket string surface, parameters of strikes against ball, number of strikes, and provision for energy-saving operation of electronic information system.

3 cl, 1 dwg