Preventing faulty operation of elevator car door

Details Preventing faulty operation of elevator car door Preventing faulty operation of elevator car door

1993-12-03

1995-03-14

Stephan, Steven L.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

187414, B66B 1314, B66B 1324

Patent

active

053969715

ABSTRACT:
Motor control arrangement for elevator car doors includes a controller which outputs driving signals to the door opening/closing motor which opens or closes the door of the car, a door open button and a door close button provided in the car for opening or closing the door of the car, a first line for transmitting an open signal from the door open button to the controller, and a second line for transmitting a close signal from the door close button to the controller. The first line and the second line communicate with (or are connected to) a third line. Within this third line, a break contact of a detection switch that operates (e.g., opens) when the car door is fully open is provided. A make contact (normally open) of the detection switch is provided between a connection point on the second line and the controller. When the car door starts to close, the make contact opens and the break contact closes so that only an open signal is transmittable to the controller.

REFERENCES:
patent: 4108281 (1978-08-01), Glaser
patent: 5107964 (1992-05-01), Coste et al.

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