Safety brake for a travel body of an elevator system

Patent metadata

Field	Value
Publication number	US-9708159-B2
Application number	US-201314647535-A
Country	US
Kind code	B2
Filing date	Nov 15, 2013
Priority date	Nov 27, 2012
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A safety brake for an elevator system having at least one traveling body movable in an elevator shaft along a guide rail and/or a brake rail. The safety brake is suitable for braking and retaining the traveling body on the guide and/or brake rail as required. The safety brake includes a control plate for receiving a brake body and for positioning the brake body relative to the guide and/or brake rail. The brake body is designed in at least two pieces and includes a first brake element and a second brake element. The first brake element is solely for braking and retaining purposes when the traveling body is moving along the guide and/or brake rail in an upward direction, and the second brake element is solely for braking and retaining purposes when the traveling body is moving along the guide and/or the brake rail in a downward direction.

First claim

The invention claimed is:

1. A safety brake for an elevator installation with at least one travel body movable along at least one of a guide rail and a brake rail in an elevator shaft, wherein the safety brake brakes and holds the travel body at the rail when required, the safety brake comprising:
a brake body having a first brake element and a second brake element, wherein the first and second brake elements are movable independently of one another, the first brake element and the second brake element are pivotable in opposite directions about a common axle, and the first brake element is substantially for braking and holding only in case of movement of the travel body along the rail in an upward direction and wherein the second brake element is for braking and fixing only in case of movement of the travel body along the rail in a downward direction; and
a control plate for positioning the brake body relative to the guide wherein the first and second brake elements are adjustable together relative to the rail to simultaneously bring the first brake element and the second brake element into contact with the guide rail, wherein the control plate is positionable in each of a rest position and a braking position by a linear movement relative to the rail.

2. The safety brake according to claim 1 wherein the control plate is held in the rest position by an electromagnet that is switched on by being provided with electric power, and wherein the electromagnet is switched off by not being provided with electric power to enable the control plate to move into the braking position by a compression spring.

3. The safety brake according to claim 1 wherein at least one of the first brake element and the second brake element is pivotably arranged on the axle at a support of the safety brake and the control plate is arranged at the support to be linearly movable or pivotably movable to position the at least one of the first brake element and the second brake element relative to the rail.

4. The safety brake according to claim 3 wherein the first brake element and the second brake element are pivotable at the same time by the control plate to pivot from a basic position out of contact with the rail to a first braking position in contact with the rail.

5. The safety brake according to claim 4 wherein the at least one of the first brake element and the second brake element is pivotable by friction locking with the rail from the first braking position to a second braking position.

6. The safety brake according to claim 5 wherein the control plate is movable from the braking position to the rest position by pivotation of the at least one of the first brake element and the second brake element from the first braking position to the second braking position.

7. The safety brake according to claim 1 wherein at least one of the first brake element and the second brake element is formed as an eccentric disc.

8. The safety brake according to claim 7 wherein the eccentric disc is curved in a section in contact with the rail in a first braking position, and the eccentric disc is planar in a section in contact with the rail in a second braking position.

9. The safety brake according to claim 8 wherein a side of the eccentric disc remote from the rail is configured such that through pivotation of the eccentric disc, from the first braking position to the second braking position, a reset force is exerted on the control plate by the side of the eccentric disc to move the control plate into the rest position.

10. The safety brake according to claim 8 wherein the control plate has a contact surface whereby on movement of the control plate into the first braking position the eccentric disc is pivoted into the first braking position by interaction with the contact surface and a restoring force is exerted on the control plate on pivotation of the eccentric disc into the second braking position.

11. The safety brake according to claim 1 wherein a first braking area of the first brake element is smaller than a second braking area of the second brake element.

12. The safety brake according to claim 11 wherein the first braking area is at most 75% of the second braking area.

13. The safety brake according to claim 11 wherein the first braking area is at most 60% of the second braking area.

14. The safety brake according to claim 1 wherein the second brake element has two eccentric discs with substantially a same braking area, wherein the first brake element has a first braking area substantially equal to the braking area of one of the eccentric discs, and wherein the first brake element is arranged between the two eccentric discs of the second brake element.

15. The safety brake according to claim 1 including a sensor for at least one of position monitoring and state monitoring of at least one of the first brake element, the second brake element and the control plate.

16. The safety brake according to claim 1 wherein at least one of the first brake element and the second brake element is biased in a direction of the control plate by at least one spring.

17. An elevator installation having a travel body and a safety brake according to claim 1 arranged at the travel body.

18. A method for braking and holding a travel body of an elevator installation with a safety brake when required, wherein the safety brake includes a control plate for positioning an at least two-part brake body relative to at least one of a guide rail and a brake rail, the method comprising the steps of:
adjusting a first brake element and a second brake element of the brake body relative to the rail by moving the control plate relative to the rail to bring the first and second brake elements into a first braking position, and thereby simultaneously bringing the first brake element and the second brake element in contact with at least one of the guide rail and the brake rail, wherein the first brake element and the second brake element are pivotable in opposite directions about a common axle; and
moving the travel body along the rail in an upward direction to bring the first brake element independently of the second brake element from the first braking position into a second braking position, or moving the travel body along the rail in a downward direction to bring the second brake element independently of the first brake element from the first braking position into the second braking position.

Assignees

• Inventio Ag

Inventors

• Rieser Benedikt
• Meierhans Daniel
• Osmanbasic Faruk
• Geisshüsler Michael

Classifications

• B66B5/20 Primary

  by means of rotatable eccentrically-mounted members (B66B5/24 takes precedence) · CPC title

• B66B5/18 Primary

  and applying frictional retarding forces · CPC title