US 12,030,743 B2
Elevator brake release monitoring
Ari Kattainen, Helsinki (FI); and Lauri Stolt, Helsinki (FI)
Assigned to Kone Corporation, Helsinki (FI)
Filed by Kone Corporation, Helsinki (FI)
Filed on Feb. 23, 2021, as Appl. No. 17/182,747.
Application 17/182,747 is a continuation of application No. 15/638,899, filed on Jun. 30, 2017, granted, now 10,954,101.
Application 15/638,899 is a continuation of application No. PCT/FI2016/050065, filed on Feb. 2, 2016.
Claims priority of application No. 15153686 (EP), filed on Feb. 3, 2015.
Prior Publication US 2021/0171317 A1, Jun. 10, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B66B 5/00 (2006.01); B66B 1/34 (2006.01); B66D 5/14 (2006.01); B66D 5/30 (2006.01); G01G 19/14 (2006.01)
CPC B66B 5/0025 (2013.01) [B66B 1/3476 (2013.01); B66B 5/0031 (2013.01); B66D 5/14 (2013.01); B66D 5/30 (2013.01); G01G 19/14 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An elevator system, comprising:
a measuring device configured to measure a weight of an elevator car of an elevator;
a brake configured to decelerate the elevator car; and
an apparatus configured to detect a failure of a release of the brake of the elevator by,
monitoring, via the measuring device, a reference weight of the elevator car from a traction sheave of the elevator while the elevator car is driven in an unloaded state in different operating directions,
determining whether the reference weight of the elevator car is same while the elevator car is driven in the different operating directions,
storing the reference weight of the elevator car as a reference value, in response to the reference weight of the elevator car being same while the elevator car is driven in the different operating directions,
instructing the brake of the elevator to open,
measuring, via the measuring device, the weight of the elevator car from the traction sheave of the elevator after instructing the brake of the elevator to open,
comparing the weight to the reference value, and
detecting the failure of the release of the brake of the elevator based on a variation between weight of the elevator car and the reference value.