Air powered door operator

Movable or removable closures – Up-and-over type; e.g. – moves from vertical to withdrawn... – With operator

Patent

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Details

160188, 160189, E05F 1100

Patent

active

044174187

ABSTRACT:
For a system in which an overhead door is raised or lowered by a combination of a cable, spring, drum and torsion bar which is rotated by a chain-driven sprocket, a pair of pneumatic cylinders having elongated rods attached to the cylinder pistons are attached to the sprocket chain to drive the chain to raise and lower the door. Braking and safety features are provided.

REFERENCES:
patent: 666170 (1901-01-01), Webster
patent: 3160200 (1964-12-01), McKee et al.
patent: 3940887 (1976-03-01), Slaybangh
patent: 4102382 (1978-07-01), Vesbach

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