Lift installation having a compensating device, so that a first roller is largely relieved of loading when the lift car is at rest

Patent metadata

Field	Value
Publication number	US-10266374-B2
Application number	US-201515527978-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Nov 25, 2014
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

The disclosure relates to a lift installation having a lift car which can be moved along a guide rail. The lift installation here comprises at least a first pair of rollers and a second pair of rollers. The guide rail runs between the two rollers of the first pair of rollers and between the two rollers of the second pair of rollers. The lift installation also has an apparatus for subjecting the lift car to a retaining force, wherein there is a horizontal offset between the point at which the retaining force takes effect and the center of gravity of the lift car, and therefore the lift car is subjected to a first torque.

First claim

The invention claimed is:

1. A lift installation having a lift car which can be moved along a guide rail, the lift installation comprising:
a first pair of rollers comprising a first and second roller receiving the guide rail therebetween;
a second pair of rollers comprising a first and second roller receiving the guide rail therebetween, wherein the lift installation has an apparatus for subjecting the lift car to a retaining force, wherein there is a horizontal offset between a point at which the retaining force takes effect and a center of gravity of the lift car, and therefore the lift car is subjected to a first torque; and
a first compensating device so that, when the lift car is at rest, the guide rail is subjected to sufficient force to give rise to a second torque, which at least partially compensates for the first torque, so that the first roller of the first pair of rollers is at least partially relieved of loading when the lift car is at rest,
wherein the first compensating device includes an actuator configured to move a contact element into and out of contact with the guide rail, wherein a travel distance of the actuator is selectively adjustable by a control unit such that the first compensating device is configured to selectively (i) relieve the entire loading on the first roller of the first pair of rollers, or (ii) partially relieve the loading on the first roller of the first pair of rollers.

2. The lift installation as claimed in claim 1 wherein the first roller of the first pair of rollers is joined by an elastic connection element to a roller housing mounting, the elastic connection element pre-tensioned to secure the first roller of the pair of rollers to the guide rail, and said partially relieving the load on the first roller of the first pair of rollers comprises reducing the load on the first roller of the first pair of rollers to 10% of the load when the first compensating device is not actuated.

3. The lift installation as claimed in claim 1 , wherein the apparatus comprises a parking brake, in which the compensating device is integrated.

4. The lift installation as claimed in claim 3 , wherein the parking brake comprises two brake shoes, and is configured when the parking brake is active to selectively apply opposing pressing forces from opposite sides against the same vertical position on the guide rail, wherein the two brake shoes act with different pressing forces on the guide rail, so that a resultant force remains to produce the second torque.

5. The lift installation as claimed in claim 4 , wherein the first roller of the first pair of rollers is connected by an elastic connection element to a roller housing mounting, a first brake shoe of the two brake shoes is arranged on the same side of the guide rail as the first roller of the first pair of rollers, the first brake shoe is connected by an elastic element to a frame and the elastic element has greater stiffness than the elastic connection element.

6. The lift installation as claimed in claim 5 , wherein the lift installation comprises lift controls and the compensating device is in signal communication with the controls.

7. The lift installation as claimed in claim 1 , wherein the lift car comprises a load-bearing frame and an interior car, wherein between the interior car and the load-bearing frame there is arranged at least one weight sensor for determining the weight of the lift car.

8. The lift installation as claimed in claim 7 , wherein the first compensating device comprises a control unit, which stands in signal communication with the weight sensor in order to generate from the signal of the weight sensor a control signal for the compensating device.

9. The lift installation as claimed in claim 8 , wherein the first compensating device comprises a control unit, which stands in signal communication with the sensor in order to generate from the signal of the sensor a control signal for the compensating device.

10. The lift installation as claimed in claim 1 , wherein the roller of the first pair of rollers comprises a sensor for determining the force transmitted across the first roller of the first pair of rollers to enable determining when the loading on the first roller of the first pair of rollers is relieved, wherein the sensor is in signal communication with the first compensating device.

11. The lift installation as claimed in claim 1 , wherein the lift car comprises a second compensating device in order to apply a force to the guide rail when the lift car is at rest so that the second torque is further produced, which at least partially compensates for the first torque, so that at least the first roller of the second pair of rollers is at least partially relieved of loading when the lift car is at rest, wherein the first compensating device and the second compensating device have a vertical offset from each other, wherein the first and second compensating devices are arranged so that the forces which the compensating devices can apply to the guide rail are directed opposite each other.

12. A lift installation comprising:
a guide rail;
a lift car having a load bearing frame;
a roller housing coupled to the load bearing frame;
a first pair of rollers disposed within the roller housing and comprising first and second rollers receiving the guide rail therebetween;
a second pair of rollers disposed within the roller housing and comprising first and second rollers receiving the guide rail therebetween;
an elastic connection element individually coupling each of the first and second rollers of both the first and second pair of rollers to a mounting of the roller housing, each elastic connection element pre-tensioned to secure one of the first and second rollers of the first and second pair of rollers against the guide rail;
a first compensating device coupled to the roller housing and configured to selectively engage the guide rail to establish a first torque on the lift car to compensate for a second torque acting on the lift car when the lift car is at rest, such that loading on the first roller of the first pair of rollers is relieved;
a second compensating device coupled to the roller housing and configured to selectively engage the guide rail to further establish the first torque such that loading on the second roller of the second pair of rollers is relieved.

13. The lift installation of claim 12 , wherein the first and second compensating devices each comprise:
a support element extending from the roller housing;
a control unit coupled to the support element between the support element and the guide rail, the control unit configured to selective actuate the associated first or second compensating device upon receipt of a signal from a lift control indicating the lift car has come to a stop; and
a contact element coupled to an actuator, wherein the control unit is configured to selectively extend the actuator such that the contact element contacts the guide rail to establish the first torque;
wherein the forces on the guide rail generated by first and second compensating devices are opposite to each other.

14. The lift installation of claim 13 , wherein the first roller of the first pair of rollers includes a sensor for determining the force transmitted across the first roller of the first pair of rollers to facilitate determining when the loading on the first roller of the first pair of rollers is relieved, wherein the sensor is in signal communication with the control unit.

15. The lift installation of claim 14 , further comprising an apparatus for subjecting the lift car to a retaining force to enable the li

Assignees

• Thyssenkrupp Elevator Ag
• Thyssenkrupp Ag

Inventors

• Löser Friedrich
• Jetter Markus

Classifications

• B66B7/046 Primary

  Rollers · CPC title

• B66B7/1246

  specially adapted for guides · CPC title

• B66B7/042 Primary

  with rollers, shoes · CPC title

• B66B19/002

  installing or exchanging guide rails (details of rails B66B7/02) · CPC title

• B66B11/0407

  actuated by an electrical linear motor (in the counterweight B66B17/12) · CPC title