Generation of an elevator door close warning

Details Generation of an elevator door close warning Generation of an elevator door close warning

1996-11-25

1998-10-13

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

187390, 187391, 318558, B66B 1314, B66B 134, G08B 2100

Patent

active

058214780

ABSTRACT:
An acoustic signal in an elevator door system is provided if a door close signal is present and a door has not closed within a determined time. A switching frequency of a pulse width modulation signal is reduced such that a motor is caused to provide the acoustic signal.

REFERENCES:
patent: 4506765 (1985-03-01), Payne et al.
patent: 4832157 (1989-05-01), Kitano
patent: 5162711 (1992-11-01), Heckler
patent: 5216337 (1993-06-01), Orton et al.

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