Apparatus and method for detecting elevator car position in a do

Details Apparatus and method for detecting elevator car position in a do Apparatus and method for detecting elevator car position in a do

1989-08-21

1990-12-18

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 150

Patent

active

049779842

ABSTRACT:
A method and apparatus for the generation of elevator car position information in an elevator shaft includes a safety light barrier mounted on the car and actuating vanes in the shaft cooperating with a safety circuit for connecting the door and lock contacts to a source of electrical power in the door zone of a destination floor for a stopping elevator car. The safety light barrier has two transmitters and two receivers which are positioned on a horizontal line and are masked simultaneously by the actuating vanes. The safety circuit includes two redundant systems for signal preparation and signal evaluation including test circuits to recognize errors and prevent a premature opening of the elevator door.

REFERENCES:
patent: 3636543 (1972-01-01), Maecker
patent: 3743056 (1973-07-01), Zitelli et al.
patent: 4362224 (1982-12-01), Fairbrother

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