Games using tangible projectile – Player held and powered – nonmechanical projector – per se,... – With user shiftable – adjustable – or interchangeable weight...
Patent
1997-03-19
1998-07-14
Stoll, William E.
Games using tangible projectile
Player held and powered, nonmechanical projector, per se,...
With user shiftable, adjustable, or interchangeable weight...
A63B 4902
Patent
active
057795711
ABSTRACT:
A ball-game racket, in particular a tennis racket, having a racket head consisting of a tension frame and netting and having a shaft (6) with handle extending away from the racket head, has at least one spring-mass system which is provided on one side of a midplane enclosing the longitudinal axis of the shaft and arranged perpendicular to the plane of the netting and has, in a movement channel extending from the handle into the racket head, at least one mass weight which is movable in the longitudinal direction of the channel against the action of a spring element between a starting position in the handle and an end position in the racket head.
REFERENCES:
patent: 3116926 (1964-01-01), Owen et al.
patent: 3907292 (1975-09-01), Moreland
patent: 3975018 (1976-08-01), Walker
patent: 4325549 (1982-04-01), Vasselli
patent: 4984792 (1991-01-01), Pacanski
patent: 5174568 (1992-12-01), You
Franz Volkl GmbH & Co.
Ski und Tennis Sportartikelfabrik KG
Stoll William E.
LandOfFree
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