GARAGE LIFT CONTROL DEVICE Russian patent published in 1997 - IPC

FIELD: mechanical engineering; lifting and transportation mechanisms. SUBSTANCE: device has reversible magnetic starter with power contacts and UP and DOWN magnetic starter, maximum current relays with make and break contacts, LIFT, LOWER and START push- buttons, voltage relays, resistor, electric lamp, operating lower and emergency upper and lower limit switches, and lift electric motors. Device has additional three-phase magnetic starter and single-phase switch. Device makes it possible to stop lift without time delay when any electric motor stops. When UP or DOWN starter power contacts are closed, lift is stopped automatically and it can be started only after elimination of sticking. Simultaneous switching on of UP and DOWN starters when LIFT and LOWER buttons are pressed on simultaneously is also prevented. EFFECT: improved reliability of operation. 2 cl, 4 dwg