Spring type ball emitting apparatus

Details Spring type ball emitting apparatus Spring type ball emitting apparatus

1980-11-13

1983-01-18

Pinkham, Richard C.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

318484, 124 16, 124 36, F41B 700

Patent

active

043688853

ABSTRACT:
A tennis practicing machine is disclosed which has a rotating arm for periodically projecting a tennis ball towards a player. A spring connected to the rotating arm stores a rotating force which is periodically released as the rotating arm passes a predetermined point causing ball emission. A power source control system is provided which controls rotation of the motor such that in order to insure safe operation of the machine, when the machine is turned off a ball is emitted if the rotating arm is within a predetermined range near the point of ball emission. Accordingly accidental jarring or vibration of the machine does not cause accidental emission of a ball. Also, the system provides a delay for starting emission of the ball when the machine is first turned on, and furthermore circuitry is provided to maintain a constant time period of operation regardless of power main frequencies of 50 or 60 Hz.

REFERENCES:
patent: 3977386 (1976-08-01), Meyer
patent: 4185608 (1980-01-01), Young et al.
patent: 4209004 (1980-06-01), Kennedy

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