ELEVATOR SYSTEM Russian patent published in 1999 - IPC

FIELD: mechanical engineering; building elevators; electric circuits used to prevent movement of elevator car when normal operation of standard door switches is violated. SUBSTANCE: system has elevator car with door, car lifting devices, car movement and stop control devices, door automatic operation devices, circuit change-over and closing devices and circuit safety unit. These functional units provide normal operation of system is case of premeditated breakage, shunting of circuit or its closing through stand-by subsystems. EFFECT: simplified design, enhanced safety in operation. 14 cl, 5 dwg