Patent ID: 7533763

Claim:
A safety system for supervising safety of an elevator, the safety system comprising: a safety space in an elevator shaft of the elevator, elevator buffers in the elevator shaft, or the safety space and the elevator buffers in the elevator shaft; a device adapted to continuously measure absolute position of an elevator car of the elevator in the elevator shaft; and a safety device; wherein if the safety system comprises the safety space, a size of the safety space is reduced, wherein if the safety system comprises the elevator buffers, a size of the elevator buffers is reduced, wherein the safety device is adapted to: receive data about the absolute position of the elevator car; calculate a velocity of the elevator car at each instant of time using the absolute position; monitor the calculated velocity in order to ensure that the calculated velocity remains within an allowed motion limit curve, wherein the allowed motion limit curve is a function of the absolute position; and control at least one stopping device for stopping uncontrolled motion of the elevator car if the calculated velocity exceeds the allowed motion limit curve.