Elevator door operator having a variable pitch lead screw

Details Elevator door operator having a variable pitch lead screw Elevator door operator having a variable pitch lead screw

1983-04-08

1984-06-19

Reeves, Robert B.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 60, B66B 1312

Patent

active

044549318

ABSTRACT:
An elevator door operator includes a motor which drives a worm gear. This worm gear controls the motion of a block which contains retractable members that engage rollers on the hall door, and which engage a block which is connected to the car door. When the car doors are fully closed, these members are fully retracted.

REFERENCES:
patent: 1269927 (1918-06-01), Groat
patent: 2985298 (1961-05-01), Kraft
patent: 3065826 (1962-11-01), Tucker, Jr.
patent: 3638762 (1972-02-01), Johns

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