Elevator hoistway terminal zone position checkpoint detection ap

Details Elevator hoistway terminal zone position checkpoint detection ap Elevator hoistway terminal zone position checkpoint detection ap

1998-04-27

2000-03-07

Salata, Jonathan

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

B66B 128

Patent

active

060327618

ABSTRACT:
An emergency terminal speed limiting device (ETSLD) uses terminal zone position checkpoint detection with a binary coding method for the sensible stationary part mounted in the terminal zone. Instead of using three separate stationary vanes of different lengths as cams for actuating three separate switches on the car as they pass by the cams, only two vanes are needed. They can be of shorter length, e.g. equal length, and overlapped in a central part of the terminal zone to create three distinct subzones to thereby create a sensible binary coded subzone indicator. The boundaries of the subzones can be used as position checkpoints. Material and manpower for installation are thereby reduced. The stationary part need not be vanes but could take other forms such as reflective tape. Likewise, the moving sensor part can be other than a cam-operated switch, such as an optical transceiver.

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