Twin sprocket garage door opener

Details Twin sprocket garage door opener Twin sprocket garage door opener

1987-06-15

1989-01-03

Dorner, Kenneth J.

Movable or removable closures

Up-and-over type; e.g., moves from vertical to withdrawn...

With operator

49360, 474140, 474160, E05F 1500

Patent

active

047947314

ABSTRACT:
An adjustable speed garage door operator which has a longitudinal rail with a trolley mounted on the rail and connected to a door to open and close it. A chain is connected to the trolley and is mounted on a front idler sprocket and can be selectively mounted on different drive sprockets which have different numbers of teeth so as to vary the speed of the door.

REFERENCES:
patent: 531220 (1894-12-01), Robinson
patent: 4231191 (1980-11-01), Ellmore

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