DEVICE TO PROVIDE SAFE OPERATION OF LIFT Russian patent published in 2000 - IPC

FIELD: lifting facilities; passenger lifts with automatic door control drive. SUBSTANCE: introduced additionally into device circuit are series connected making contacts of selecting pulse relays for each floor and making contacts of shaft doors for energizing shaft penetration control relay. Making contacts of shaft doors are connected in parallel by pairs on each floor. With lift cabin stopped accurately with closed making contacts of selecting pulse relays, shaft penetration control relay will be energized only when shaft door wing of any floor shaft door is opened, except for the floor where lift cabin is stopped. EFFECT: enhanced reliability of device, simplified electric circuit. 1 dwg