Inventio Lcc

Hansjorg Arnosti

Hans Bussmann

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.

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Horw, Switzerland

Hansjorg Arnosti