Elevator hoistway door interlock

Details Elevator hoistway door interlock Elevator hoistway door interlock

1988-08-12

1989-06-20

Rolla, Joseph J.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187 61, 200 6171, B66B 1300

Patent

active

048402540

ABSTRACT:
An electro-mechanical elevator hoistway door interlock which includes an electrical switch mounted adjacent to a hoistway door jamb having a pair of spaced pivotable contact actuatable from first to second positions by a bridging contact carrier by the associated hatch door. The bridging contact pivots the spaced pivotable contacts in opposite rotational directions as they are actuated between the two positions, providing a contact wiping action during each engagement and disengagement. Springs bias the pivotable contacts towards their first positions, and carry current in an active electrical circuit when the pair of spaced pivotable contacts are actuated by the bridging contact.

REFERENCES:
patent: 2307542 (1943-11-01), Prince

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