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US 12,030,743 B2Granted
Elevator brake release monitoring
AssigneeKone Corporation
InventorsAri Kattainen, Lauri Stolt
Life of this patent
Estimating the term…
Abstract
Brake release sensors for an elevator can be replaced by an arrangement wherein the brake release is determined from the force caused by the brake. This is achieved by providing measuring device for measuring the weight of an elevator car between the brake and the motor body so that the weight of the elevator car is measured only when the brake is on.
Claims6
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.
8 more elements
Dependencies are inferred from the claim text.