Door operation control apparatus

Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel

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Details

318282, 318266, G05B 500

Patent

active

043933424

ABSTRACT:
A motor for driving a garage door is controlled by a control unit, which counts the time required for the garage door to move between an upper limit switch and a lower limit switch. The control unit sets a comparison reference time on the basis of the time thus counted, and controls the motor in such a manner that the motor driving does not continue for a period of time longer than the comparison reference time.

REFERENCES:
patent: 4006392 (1977-02-01), Catlett et al.
patent: 4035702 (1977-07-01), Pettersen et al.
patent: 4234833 (1980-11-01), Barrett
patent: 4263536 (1981-04-01), Lee et al.
patent: 4328540 (1982-05-01), Matsuoka et al.

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