Garage door opener

Details Garage door opener Garage door opener

1978-04-06

1981-01-27

Smith, Jr., David

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

49 28, 318467, 318469, G05D 308

Patent

active

042478065

ABSTRACT:
A garage door opener includes a radio receiver and a push button each operable to initiate a pulse for effecting a switching device which in turn energizes a latching relay. Operation of the latching relay completes an energizing circuit to the appropriate winding of a reversible motor which moves the door toward an open or closed position. A sensing circuit is operable for effecting the reversal of the latching relay to change the direction of motor operation in the event the door engages an object in its path. A foot switch may also be provided for positively sensing an obstacle and reversing the drive motor. A transmitter may be provided with an impulse circuit to limit the duration of the system actuating signal regardless of how long the transmitter push button is depressed.

REFERENCES:
patent: 3287618 (1966-11-01), Stephens
patent: 3581174 (1971-05-01), Hammer
patent: 3617835 (1971-11-01), Dreher
patent: 3617837 (1971-11-01), Beck
patent: 3813590 (1974-05-01), Ellmore
patent: 3891909 (1975-06-01), Newson
patent: 4055623 (1977-10-01), Gatland et al.
patent: 4107877 (1978-08-01), Lee
patent: 4131830 (1978-12-01), Lee et al.

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