Elevator system leveling safeguard control and method

An elevator system leveling safeguard comprising:

• a structure having a plurality of floors, each of said floors having an associated floor landing zone defined by a preset distance on either side of said floor,
• an elevator car mounted for movement in said structure to serve the floors,
• door means for said car having a door adapted to be controlled to open and close on signal,
• motive means for causing said elevator car to make a run and stop at a target floor,
• and control means being interactive with said motive means and with said door means including means for directing said elevator car to land and then remain at the target floor with its said door means signalled to open for door opening and remain open only within said floor landing zone,
• said control means including channel circuit means being energized for moving the car up or down in the door opened condition, said channel circuit means including safeguard means for shutting down said car motive means upon failure of said control means,
• so that a failure of said control means after said door means has been signalled to open will result in the motive means causing the car to stop within the floor landing zone of the target floor without moving the car therebeyond in the door opened condition.

A method for protecting an elevator system in the manner of a leveling safeguard in a structure having a plurality of floors, and method comprising:

• providing each of said floors with an associated floor landing zone defined by a preset distance on either side of said floor,
• providing an elevator car mounted for movement in said structure to serve the floors,
• providing door means for said car having a door adapted to be controlled to open and close on signal,
• providing motive means for causing said elevator car to make a run and stop at a target floor,
• and providing control means interactive with said motive means and with said door means and directing said elevator car to land and then remain at the target floor with its said door means signalled to open for door opening and remaining open only within said floor landing zone,
• said interactive control means energizing, through a channel circuit means, the movement of the car up or down in the door opened condition, the channel circuit means providing safeguarding for shutting down the car motive means upon failure of the control means,
• so that a failure of said control means after said door mens has been signalled to open will result in the motive means causing the car to stop within the floor landing zone of the target floor without moving the car therebeyond in the door opened condition.