Elevator brake release monitoring

Patent metadata

Field	Value
Publication number	US-12030743-B2
Application number	US-202117182747-A
Country	US
Kind code	B2
Filing date	Feb 23, 2021
Priority date	Feb 3, 2015
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

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.

First claim

The invention claimed is:

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.

2. The elevator system of claim 1 , further comprising:
the elevator car configured to move, within a shaft, between floors.

3. The elevator system of claim 1 , wherein the apparatus comprises:
a non-volatile memory configured to store the reference value; and
a processor configured to read the reference value from the non-volatile memory.

4. The elevator system of claim 1 , wherein the apparatus is further configured to transmit an error message in response to the apparatus detecting the failure of the brake of the elevator.

5. The elevator system of claim 1 , wherein the elevator system configured to move the elevator car to a next floor in response to the apparatus detecting the failure of the brake of the elevator.

6. The elevator system of claim 1 , wherein the elevator system configured to restrict use of the elevator in response to the apparatus detecting the failure of the brake of the elevator.

Assignees

• Kone Corp

Inventors

• Kattainen Ari
• Stolt Lauri

Classifications

• G01G19/14

  for weighing suspended loads (G01G3/00 takes precedence; incorporation of weighing devices in cranes B66C1/40, B66C13/16) · CPC title

• B66B1/3476

  Load weighing or car passenger counting devices (B66B5/14 takes precedence) · CPC title

• B66B5/0031

  for safety reasons · CPC title

• B66D5/30

  electrical · CPC title

• B66D5/14 Primary

  embodying discs · CPC title