Elevator door lock

Details Elevator door lock Elevator door lock

1990-10-31

1992-07-14

Olszewski, Robert P.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

157 61, B66B 1300

Patent

active

051294869

ABSTRACT:
A center opening, linkage driven elevator door system comprises: a single door lock; an air cord; a first hoistway door attached to the air cord; a second hoistway door having a stop in register with the air cord, the second hoistway door being locked by said lock; an abutment attaching to the air cord, the abutment contacting the stop attached to the second hoistway door when the first and second hoistway doors are closed such that the first hoistway door cannot move when the second hoistway door is locked, the abutment not contacting the stop during the opening of the doors due to the different relative speeds of the first and second hoistway doors.

REFERENCES:
patent: 2235380 (1941-03-01), McCormick
patent: 2859835 (1958-11-01), Borden
patent: 2960188 (1960-11-01), Schweig
patent: 3065826 (1962-11-01), Tucker, Jr.

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