Movable or removable closures – With operator for movably mounted closure – Operator drives closure along guide
Patent
1979-09-07
1981-10-27
Downey, Kenneth
Movable or removable closures
With operator for movably mounted closure
Operator drives closure along guide
49137, 60476, E05F 1502
Patent
active
042965705
ABSTRACT:
An automatic door operator for opening and closing a door such as a cold storage door which is mounted in a frame for sliding movement in a vertical plane has a hydraulic control system which includes an electric motor for rotating a reversible hydraulic pump, an electric control circuit which activates the electric motor to rotate the pump in the appropriate direction, and a reversible rotary hydraulic motor driven by the pump to rotate a chain drive which draws the door to its open and closed positions. The hydraulic control system also includes a means for cushioning the rapid start and stop of the door to provide smooth operation which includes a pair of check valves disposed in the control system such that one check valve is on either side of the hydraulic pump, and a first set of pressure relief valves disposed in the control system on either side of the pump between the pump and the check valves, and a second set of pressure relief valves between the check valves and the hydraulic motor. The check valves provide a locking mechanism for the door so that when the flow of hydraulic fluid from the pump stops, the door is locked in its open or closed position.
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Balbach George C.
Peterman Robert J.
Arthur Smith Industries, Inc.
Downey Kenneth
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