Door control apparatus

Details Door control apparatus Door control apparatus

1983-05-31

1984-12-25

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 86, 318109, 318442, H02J 906

Patent

active

044906242

ABSTRACT:
A fail safe mechanism for power operated doors comprises an auxiliary power supply, an electric motor, a self operating clutch to connect the motor to the door's normal drive assembly and a relay/timer circuit to energize the motor in the event of a mains failure to enable the motor to drive the door open.

REFERENCES:
patent: 3790810 (1974-02-01), Rogers et al.
patent: 3874117 (1975-04-01), Boehm
patent: 4029176 (1977-06-01), Mills

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