US 12,252,376 B2
Method for releasing safety gears, and a stalling detector
Tapio Siironen, Helsinki (FI); Tapani Talonen, Helsinki (FI); and Tarvo Viita-aho, Helsinki (FI)
Assigned to KONE CORPORATION, Helsinki (FI)
Filed by KONE Corporation, Helsinki (FI)
Filed on Feb. 25, 2021, as Appl. No. 17/184,727.
Claims priority of application No. 20161974 (EP), filed on Mar. 10, 2020.
Prior Publication US 2021/0284499 A1, Sep. 16, 2021
Int. Cl. B66B 5/02 (2006.01); B66B 3/00 (2006.01); B66B 7/12 (2006.01)
CPC B66B 5/027 (2013.01) [B66B 3/002 (2013.01); B66B 7/1215 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for releasing engaged safety gears of an elevator car or a counterweight of an elevator system, the elevator system comprising an elevator car, a hoisting machinery, a counterweight and a stalling detector coupled to compensation roping associated with the elevator car and the counterweight, the method comprising:
monitoring tension in the compensation rope;
providing a stalling indication to interrupt power to the hoisting machinery upon detection of increased compensation rope tension;
preventing the stalling indication from the stalling detector during releasing of the engaged safety gears; and
moving the elevator car downwards in order to release the engaged safety gears.