Tennis racket with frame mounted oscillatable weights

Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target

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273 73C, A63B 4904

Patent

active

043535518

ABSTRACT:
A tennis racket comprises dynamic weights (6) distributed symmetrically relative to the longitudinal axis of the racket between the throat and the transverse axis of the head and suspended by arcuate straps (7) glued to the racket frame (2), the weights being displaceable in a direction perpendicular to the plane of the stringed area (3). The combination of weights and straps is adapted for having an intrinsic vibration frequency about 1.4 to 2 times the fundamental vibration frequency of the racket, such that when the weights are vibrated at their intrinsic frequency (by a ball striking the racket), the vibration of the racket is damped by energy transfer to the weights, and yet energy is also returned to the racket as a reaction in the direction of the ball's flight before the ball leaves the racket. The angular stability of the racket is improved over either fixed weights or dynamic weights having frequencies outside the critical range.

REFERENCES:
patent: 1526734 (1925-02-01), Andrews et al.
patent: 1825244 (1931-09-01), Nero
patent: 3172438 (1965-03-01), Gianelli
patent: 3757761 (1973-09-01), Izuta
patent: 3801099 (1974-04-01), Lair
patent: 3941380 (1976-03-01), Lacoste
patent: 4057250 (1977-11-01), Kuban
patent: 4174110 (1979-11-01), Yamamoto
patent: 4182512 (1980-01-01), Kuebler

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