Hydraulic door operator

Details Hydraulic door operator Hydraulic door operator

F - Mech Eng,Light,Heat,Weapons

16

H

138/41

F16H 39/02 (2006.01) E05F 15/06 (2006.01)

Patent

CA 1145649

HYDRAULIC DOOR OPERATOR Abstract of Disclosure 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 mechanism for cushioning the rapid start and stop of the door to provide smooth operation which includes a pair of check valves disposed in the con- trol 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 mecha- nism 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.

359815

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