Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1993-03-26
1994-10-18
Ro, Bentsu
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318266, 318286, 49 30, E05F 1520
Patent
active
053571835
ABSTRACT:
A control device for garage door opener to provide automatic reclose and safety reverse if obstruction occurs is disclosed. Photoelectric sensors are positioned across the door opening to detect the passage of a vehicle through the door and signal the device to reclose the door. The sensors also detect obstruction and reverse closing movement of the door or, otherwise, disable activation of movement. An oscillator causes the door to reclose if the door remained open for a predetermined time interval. Safety warning signal is generated shortly before the oscillator controlled reclosure.
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