Obstruction detection system
Operating system for lift doors
Optically-coupled sensing and control system
Optimized "up peak" elevator channeling system with...
Optimized diverting pulley arrangement for traction sheave...
Orienting and positioning apparatus for article handling
Oscillation-damping control of motor torque for mine hoist
Outside rescue elevator system
Overhead self-levelling lift system for transporting...
Overhead supporting beam for an elevator door and a door...
Overspeed prevention system for elevator cars