Door positioning system

Details Door positioning system Door positioning system

1993-01-21

1995-01-03

Kannan, Philip C.

Movable or removable closures

With operator for movably mounted closure

Operator drives closure along guide

49 4, 49139, 49141, 49362, E05F 1154

Patent

active

053774485

ABSTRACT:
A door positioning mechanism with a moveable carriage driven by a motor through a lead screw, wherein the moveable carriage is connected to open and close the door by movement of the door rectilinearly along a track through the expedient of a drive train utilizing a multiple sheave and cable connection between the door and the moveable carriage. A hand disconnect is provided to disable the positioning mechanism and allow manual movement of the door. A thermal (fire switch) dead weight control is also provided to over-ride the positioning mechanism and automatically shut the door.

REFERENCES:
patent: 879883 (1908-02-01), Mull
patent: 1343757 (1920-06-01), Akers
patent: 1816258 (1931-07-01), Lake
patent: 3072394 (1963-01-01), Urquhart
patent: 3834081 (1974-09-01), Catlett
patent: 3872622 (1975-03-01), Berk
patent: 4370826 (1983-02-01), Davidson

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