Safety brake for an elevator installation

Patent metadata

Field	Value
Publication number	US-9745171-B2
Application number	US-201314651838-A
Country	US
Kind code	B2
Filing date	Dec 5, 2013
Priority date	Dec 13, 2012
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

In an elevator installation an elevator car is movable along at least two guide rails and the car is equipped with a pair of safety brakes and an actuator for actuating the safety brakes. Each safety brake includes at least one brake eccentric with a cylindrical bearing bore and a brake housing with a bearing axle for mounting the brake eccentric. The bearing axle is arranged in the brake housing together with the brake eccentric to be pivotable or displaceable so that the brake eccentric, which is arranged on the bearing axle, in a first position can be kept at a spacing from a brake web of the guide rail and in a second position can be brought into contact with the brake web.

First claim

The invention claimed is:

1. A safety brake for braking or holding an elevator car at a brake web comprising:
a brake eccentric having a cylindrical bearing bore; and
a brake housing with a bearing axle mounting the brake eccentric, the bearing axle being arranged in the brake housing to be pivotable or displaceable with respect to the brake housing so that the brake eccentric in a first position is maintained at a spacing from the brake web and in a second position is brought into contact with the brake web, wherein the bearing axle is arranged in the brake housing to be pivotable about a vertical axis, the vertical axis being parallel with a length of the brake web.

2. The safety brake according to claim 1 wherein the brake eccentric is secured on the bearing axle by a mounting plate.

3. An elevator installation having the elevator car and at least one pair of the safety brakes according to claim 1 wherein the pair of safety brakes is actuated by a centrally arranged actuator and wherein the actuator acts on an actuating lever of each of the safety brakes by pulling or pushing.

4. The elevator installation according to claim 3 wherein the actuator is controlled by a safety control and the safety control in response to excess speed of the elevator car or in response to unintended movement of the elevator car from a stopping position activates the actuator to actuate the at least one pair of safety brakes.

5. A safety brake for braking or holding an elevator car at a brake web comprising:
a brake eccentric having a cylindrical bearing bore; and
a brake housing with a bearing axle mounting the brake eccentric, the bearing axle being arranged in the brake housing to be pivotable or displaceable with respect to the brake housing so that the brake eccentric in a first position is maintained at a spacing from the brake web and in a second position is brought into contact with the brake web, wherein the brake housing has a passage through which the bearing axle projects and a first device for moving the brake eccentric together with the bearing axle into the first position and the first position is at an end stop of the passage.

6. The safety brake according to claim 5 wherein the first device for moving the brake eccentric into the first position includes a spring or spring mechanism that draws the brake eccentric into the first position at the end stop of the passage.

7. The safety brake according to claim 5 wherein the brake web is a component of a guide rail, the safety brake co-operates with the brake web for braking the elevator car and the safety brake further includes a brake member arranged at the brake housing opposite the brake eccentric to clamp the brake web between the brake eccentric and the brake member, wherein when the brake eccentric is brought into contact with the brake web in the second position, the brake eccentric together with the bearing axle are rotated by a relative movement between brake web and the safety brake back into the first position and the end stop of the passage accepts a pressing force generated by the brake eccentric and transmits the pressing force to the brake housing.

8. The safety brake according to claim 5 wherein the bearing axle is connected with an actuating lever and the actuating lever together with the bearing axle are pivotable about a vertical axis and the actuating lever is pivotable by an actuator together with the bearing axle to bring the brake eccentric into contact with the brake web.

9. The safety brake according to claim 5 wherein the first device includes a spring mechanism for drawing the brake eccentric into the first position, the spring mechanism including a pull lever, a rocker and a spring, wherein the pull lever and the rocker are pivotably connected together and wherein the pull lever is connected with the brake eccentric and the rocker is pivotably mounted in the brake housing, and wherein the spring acts on the rocker to draw the brake eccentric into the first position by way of the pull lever.

10. The safety brake according to claim 9 wherein the rocker actuates a switch when the rocker reaches a tilt setting corresponding with a braking setting of the brake eccentric.

11. The safety brake according to claim 9 wherein the spring mechanism includes a detent setting that secures the brake eccentric in the first position against unintended pivotation.

12. The safety brake according to claim 5 wherein the brake eccentric is secured on the bearing axle by a mounting plate.

13. An elevator installation having the elevator car and at least one pair of the safety brakes according to claim 5 wherein the pair of safety brakes is actuated by a centrally arranged actuator and wherein the actuator acts on an actuating lever of each of the safety brakes by pulling or pushing.

14. The elevator installation according to claim 13 wherein the actuator is controlled by a safety control and the safety control in response to excess speed of the elevator car or in response to unintended movement of the elevator car from a stopping position activates the actuator to actuate the at least one pair of safety brakes.

Assignees

• Inventio Ag

Inventors

• Husmann Josef

Classifications

• B66B5/20 Primary

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