Elevator door tampering protection system

Details Elevator door tampering protection system Elevator door tampering protection system

1977-05-05

1978-08-22

Schaefer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 1322

Patent

active

041082818

ABSTRACT:
An automatic elevator system having car movement controls, door controls, a door operating mechanism for automatically opening and closing at least the car door and first switch contacts operable when the car and hoistway doors are closed to permit the car to move from a floor in combination with further switch contacts which are operable in accordance with the positions of the doors and which prevent the car from moving from a floor when the first switch contacts are operated before the further switch contacts to prevent movement of the car from a floor when the first switch contacts have been operated or shunted by unauthorized persons or by a short circuit.

REFERENCES:
patent: 1934867 (1933-11-01), Lindstrom et al.
patent: 2776731 (1957-01-01), Savino et al.
patent: 2867292 (1959-01-01), Bruns

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