Patent ID: 11897728
Assignee: KONE CORPORATION
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 13:
14. A method for controlling an elevator, the elevator comprising:
a car;
a counterweight;
a hoisting member connecting the car with the counterweight over a traction sheave; and
a free fall protection system comprising:
a free fall protection controller;
a free fall protection member connecting the car with the counterweight over the traction sheave or over a separate free fall traction sheave, whereby a pre-tensioning load of the free fall protection member is less than a pre-tensioning load of the hoisting member, so that the car and the counterweight are supported by the free fall protection member alone only in a situation in which the hoisting member support fails, wherein a first end of the free fall protection member is attached to the car and a second end of the free fall protection member is attached to the counterweight; and
at least one free fall protection brake device arranged to stop the movement of the free fall protection member and thereby also the movement of the car and/or the counterweight,

the method comprising the step of activating the at least one free fall protection brake device with the free fall protection controller to stop the movement of the free fall protection member and thereby also the movement of the car and/or the counterweight when the hoisting member support fails.