Ball throwing machine

Details Ball throwing machine Ball throwing machine

1983-01-21

1985-05-21

Apley, Richard J.

Mechanical guns and projectors

Spring

Elastic band

200 6141, 273318, 273 26D, 24380, F41B 700

Patent

active

045179530

ABSTRACT:
A ball throwing machine for hitting out tennis balls or the like at predetermined time intervals, in which a lock cover is rotatable or slidable into engagement with a switch which is capable of making and breaking an electric current to a drive motor. Said lock cover is mounted in a position adjacent to a rotating trace of a hitting lever. In the event an object other than ball, for example, a hand, a finger or a rod, should be drawn into the interior of the machine together with the hitting lever while this lever is rotated by a motor to expand a biasing spring, the lock cover will rotate or slide to break the electric current to the motor and stop the motor immediately, thereby preventing the occurrence of injury.

REFERENCES:
patent: 1761030 (1930-06-01), Zwiebel
patent: 2696204 (1954-12-01), Gilgoff
patent: 4269162 (1981-05-01), Abraham et al.
patent: 4311952 (1982-01-01), Mabuchi et al.
patent: 4315174 (1982-02-01), Doerr
patent: 4368885 (1983-01-01), Katada et al.

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