Blocked door detection for an elevator system

Details Blocked door detection for an elevator system Blocked door detection for an elevator system

1996-12-18

1998-11-24

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

With barrier for regulating access to load support

Includes motor or motor driven linkage for shifting barrier

49 26, B66B 1314

Patent

active

058410830

ABSTRACT:
A method for detecting if an elevator door is blocked comprises the steps of: initiating a movement of the elevator door; starting a timer count upon the initiation of the movement of the door; determining if the timer count has expired before a door position reference switch is actuated; and determining that the elevator door is blocked if the timer count has expired before the door position reference switch is actuated.

REFERENCES:
patent: 3814214 (1974-06-01), Booker, Jr.
patent: 4505360 (1985-03-01), Tsuji
patent: 4750591 (1988-06-01), Coste et al.

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