Electricity: motive power systems – Motor-reversing – Automatic and/or with time-delay means
Patent
1993-09-08
1995-04-11
Ro, Bentsu
Electricity: motive power systems
Motor-reversing
Automatic and/or with time-delay means
318266, G05D 310, E05F 1510
Patent
active
054061792
ABSTRACT:
A reversing circuit including an obstruction-sensing device adapted to be used with an electrically powered door or gate, which when connected to a standard motor operator which utilizes an A.C. control voltage and has a two or three button control station (open, close and optional stop) gives the operator capability to reverse power the door or gate should it engage an obstruction when closing. The reversing circuit is connected to the pushbutton wiring of the motor operator and utilizes the control voltage that appears between the stop-open terminal pair when the door is not opening nor at full open, and that appears between the stop-close terminal pair when the door is not closing nor at full close, as a limited power supply for powering the circuit. Full closure of the door or gate deactivates reopening section of the circuit so as to preclude opening of the door from outside by activating the sensing device.
REFERENCES:
patent: 4035702 (1977-07-01), Pettersen et al.
patent: 4364003 (1982-12-01), Phipps
patent: 4463292 (1984-07-01), Engelmann
patent: 4583081 (1986-04-01), Schmitz
patent: 4701684 (1987-10-01), Seidel et al.
patent: 4922168 (1990-05-01), Waggamon et al.
patent: 4924159 (1990-05-01), Olson
Davall Ira G.
Pariot Robert
Ro Bentsu
Techstrip Inc.
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