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
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.
Schonauer Uwe
Schroder-Brumloop Helmut L.
Nappi Robert
Otis Elevator Company
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