Brake device for an elevator car, comprising an integrated load measuring device, use thereof in an elevator system, and method

Patent metadata

Field	Value
Publication number	US-11772933-B2
Application number	US-202017755157-A
Country	US
Kind code	B2
Filing date	Oct 29, 2020
Priority date	Oct 31, 2019
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A braking apparatus, that brakes and measures load changes in an elevator car, includes a brake, a brake holding arrangement holding the brake on the car, a load measuring device measuring a force acting on a force transmission element and a load measuring device holding arrangement holding the load measuring device on the car. The brake can be displaced relative to the car in a force direction generated by the brake and the load measuring device is held on the car fixed relative to the car in the force direction. The force transmission element is operatively connected to the brake to measure a force acting between the brake and the load measuring device due to a relative displacement of the brake relative to the load measuring device. A connecting piece arrangement connects the load measuring device holding arrangement and the brake holding arrangement in an elastically deformable manner.

First claim

The invention claimed is:

1. A braking apparatus for braking a displaceable elevator car of an elevator installation and for measuring load changes caused in the elevator car, the braking apparatus comprising:
a brake adapted to brake the elevator car relative to a stationary component of the elevator installation;
a brake holding arrangement adapted to hold the brake on the elevator car;
a load measuring device having a force transmission element measuring a force acting on the force transmission element;
a load measuring device holding arrangement adapted to hold the load measuring device on the elevator car;
wherein the brake and the brake holding arrangement are held on the elevator car by the brake holding arrangement such that the brake can be displaced relative to the elevator car in a force direction generated by actuation of the brake;
wherein the load measuring device and the load measuring device holding arrangement are held on the elevator car by the load measuring device holding arrangement such that the load measuring device is fixed relative to the elevator car in the force direction;
wherein the force transmission element is operatively connected to the brake to measure a force acting between the brake and the load measuring device due to a displacement of the brake relative to the load measuring device; and
wherein the load measuring device holding arrangement and the brake holding arrangement are connected to one another in an elastically deformable manner via a connecting piece arrangement.

2. The braking apparatus according to claim 1 wherein the brake can be displaced relative to the elevator car up to a predetermined position in the force direction.

3. The braking apparatus according to claim 1 wherein the brake holding arrangement has slots formed therein, a longitudinal direction of the slots extending parallel to the force direction, and fixing elements held stationary on the elevator car extend through the slots to hold the brake holding arrangement on the elevator car.

4. The braking apparatus according to claim 1 wherein the connecting piece arrangement deforms elastically when a force corresponding to a weight of the elevator car including a maximum permissible payload of the elevator car is transmitted between the brake holding arrangement and the load measuring device holding arrangement.

5. The braking apparatus according to claim 1 wherein the connecting piece arrangement deforms by less than 1 mm in the force direction when a force corresponding to a weight of the elevator car including a maximum permissible payload of the elevator car is transmitted between the brake holding arrangement and the load measuring device holding arrangement.

6. The braking apparatus according to claim 1 wherein the connecting piece arrangement extends transversely to the force direction at least in a sub-region of the connecting piece arrangement.

7. The braking apparatus according to claim 1 wherein the brake holding arrangement, the load measuring device holding arrangement and the connecting piece arrangement are formed in one piece by a common part.

8. The braking apparatus according to claim 7 wherein the one piece common part is formed of stamped sheet metal.

9. The braking apparatus according to claim 1 wherein the force transmission element is connected via a strain gauge to a counter-element of the load measuring device, the counter-element being fixed to the load measuring device holding arrangement.

10. The braking apparatus according to claim 1 wherein the load measuring device generates an electrical signal representing the force acting on the force transmission element.

11. The braking apparatus according to claim 1 wherein the brake is a holding brake for holding the elevator car stationary against its weight during a stop.

12. The braking apparatus according to claim 11 wherein the brake also is a safety brake for braking the elevator car in an emergency to stop a free fall of the elevator car.

13. An elevator installation comprising:
an elevator car;
a guide rail guiding the elevator car, the elevator car being displaceable along the guide rail;
the braking apparatus according to claim 1 ;
wherein the braking apparatus is held on the elevator car by the brake holding arrangement thereof and the load measuring device holding arrangement thereof; and
wherein the brake interacts with the guide rail to brake the elevator car.

14. A method for measuring a load acting on an elevator car, the method comprising the steps of:
providing the braking apparatus according to claim 1 on the elevator car;
activating the brake of the braking apparatus while the elevator car is stationary; and
measuring a load acting on the elevator car using the load measuring device of the braking apparatus.

15. A method for setting a force to be exerted by a drive device on an elevator car in response to a load change in the elevator car, the method comprising the steps of:
performing the method according to claim 14 to measure a load change in the load acting on the elevator car; and
setting the force exerted by the drive device on the elevator car to compensate for the measured load change.

16. The method according to claim 15 including further steps of, before the load change occurs, measuring the force acting between the brake and the load measuring device by the load measuring device as a reference force; and after activation of the brake and after the load change has occurred, setting the force exerted by the drive on the elevator car such the load measuring device measures a force corresponding to the reference force.

17. A braking apparatus for braking a displaceable elevator car of an elevator installation and for measuring load changes caused in the elevator car, the braking apparatus comprising:
a brake adapted to brake the elevator car relative to a stationary component of the elevator installation;
a brake holding arrangement adapted to hold the brake on the elevator car;
a load measuring device having a force transmission element measuring a force acting on the force transmission element;
a load measuring device holding arrangement adapted to hold the load measuring device on the elevator car;
wherein the brake and the brake holding arrangement are held on the elevator car by the brake holding arrangement such that the brake can be displaced relative to the elevator car up to a predetermined position in a force direction generated by actuation of the brake;
wherein the load measuring device and the load measuring device holding arrangement are held on the elevator car by the load measuring device holding arrangement such that the load measuring device is fixed relative to the elevator car in the force direction;
wherein the force transmission element is operatively connected to the brake to measure a force acting between the brake and the load measuring device due to a displacement of the brake relative to the load measuring device, the load measuring device generating an electrical signal representing the force acting on the force transmission element; and
wherein the load measuring device holding arrangement and the brake holding arrangement are connected to one another in an elastically deformable manner via a connecting piece arrangement, the connecting piece arrangement deforming elastically when a force corresponding to a weight of the elevator car including a maximum permissible payload of the elevator car is transmitted between the brake holding arrangement and the load measuring device holding arrangement, and the con

Assignees

• Inventio Ag

Inventors

• Bütler Erich
• Lo Jacono Romeo
• Perfetto Antonio
• Trottmann Gilles

Classifications

• B66B5/18 Primary

  and applying frictional retarding forces · CPC title

• B66B1/3484 Primary

  using load cells · CPC title

• B66B7/04

  Riding means, e.g.} Shoes, Rollers, {between car and guiding means, e.g. rails, ropes (rollers adapted to match the shape of a special guiding means B66B7/02; vibration attenuation systems acting between car and its supporting frame B66B11/026) · CPC title

• B66B17/34 Primary

  Safe lift clips; Keps · CPC title