Elevator system door tampering protection circuits

Details Elevator system door tampering protection circuits Elevator system door tampering protection circuits

B - Operations, Transporting

66

B

364/25

B66B 13/22 (2006.01)

Patent

CA 1105160

ELEVATOR SYSTEM DOOR TAMPERING PROTECTION CIRCUITS ABSTRACT OF THE DISCLOSURE: 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 con- tacts to prevent movement of the car from a floor when the first switch contacts have been operated or shunted by un- authorized persons or by a short circuit.

301429

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