Blocked door detection for an elevator system

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

Patent

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Details

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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