Overhead door opener

Details Overhead door opener Overhead door opener

E - Fixed Constructions

05

F

268/22

E05F 15/08 (2006.01)

Patent

CA 1105506

ABSTRACT An operator for an overhead door comprises a fluid actuatel device including a cylinder and a cooperating piston. The piston rod carries a pair of cable sheaves. Another pair of sheaves are rotatable on a fixed mounting. A cable is wound around pulleys in corresponding pairs. Each cable has one end anchored and another end fastened to the door so when the fluid actuated devices spread the pair of sheaves, the door lifts. Pressurized fluid is relieved from the cylinder to let the door close under its own weight. Electric circuits for actuating the hy- draulic circuit are shown.

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