Door operator with instant reverse feature

Details Door operator with instant reverse feature Door operator with instant reverse feature

E - Fixed Constructions

05

F

268/25

E05F 15/12 (2006.01)

Patent

CA 1053272

A B S T R A C T An improved garage door operator of the motor-driven chain-and- sprocket type comprising a molded plastic gear case assembly supporting an output shaft for rotation relative thereto. A molded plastic worm wheel is loosely disposed on the shaft for limited rotation relative thereto and is driven by a reversible electric motor through a worm. Up and down limits are established by means of a small threaded shaft which is driven off of the worm wheel and which procuces linear displacement of a limit switch actuator traveler. The traveler carries adjustable dogs which operate res- pective limit switches in a limit switch carrier which is mounted on the gear case.

314770

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