Elevator safety brake, elevator and method for testing elevator safety brakes

Patent metadata

Field	Value
Publication number	US-2020062545-A1
Application number	US-201916547311-A
Country	US
Kind code	A1
Filing date	Aug 21, 2019
Priority date	Aug 22, 2018
Publication date	Feb 27, 2020
Grant date	—

Abstract

An elevator safety brake unit, an elevator including at least two of the safety brake units, and a method for testing the safety brake units are disclosed. Each safety brake unit includes a frame part, a movable composition movably supported on the frame part, a compression spring assembly associated with the movable composition, and adapted to activate a braking by pushing the movable composition forward, and a coil assembly of an electromagnet disposed in the frame part and adapted to deactivate the braking by pulling the movable composition backwards. Each movable composition includes at least two movable elements, one compression spring for each movable element, and at least one coil assembly adapted to deactivate the braking by pulling the at least two movable elements backwards.

First claim

1 . An elevator safety brake unit comprising:
a frame part; a movable composition movably supported on said frame part; a compression spring assembly or corresponding associated with said movable composition, and adapted to activate a braking by pushing said movable composition forward; and a coil assembly of an electromagnet disposed in said frame part and adapted to deactivate the braking by pulling said movable composition backwards, wherein each movable composition comprises at least two movable elements, one compression spring or corresponding for each movable element, and at least one coil assembly adapted to deactivate the braking by pulling said at least two movable elements backwards.

2 . The elevator safety brake unit according to claim 1 , wherein each brake unit comprises N movable elements and N compression springs, where N is an integer greater than one.

3 . The elevator safety brake unit according to claim 1 , wherein the movable elements pushed by the compression springs of the safety brake unit are configured to engage and disengage with different electromagnet currents.

4 . The elevator safety brake unit according to claim 3 , wherein the engagement and disengagement of the movable elements are adjusted by spring forces of the compression springs and/or the air gaps between the movable elements and the coil assembly.

5 . The elevator safety brake unit according to claim 3 , wherein the engagement and disengagement of the movable elements is actuated by gradually changing the current in the coil assembly of the electromagnet in the brake unit.

6 . The elevator safety brake unit according to claim 3 , wherein the movable elements are arranged to engage and disengage one after the other.

7 . The elevator safety brake unit according to claim 1 , wherein the type of the safety brake unit is one of the following: a shoe brake, a drum brake, a disc brake.

8 . An elevator comprising:
an elevator car movable up and down along guide rails in an elevator shaft by a driving machinery, the driving machinery comprising:
a drive motor;
a traction sheave; and
a brake assembly to stop the rotational motion of the traction sheave,
wherein the brake assembly comprises at least two safety brake units of claim 1 operatively associated with the drive motor.

9 . The elevator according to claim 8 , wherein the safety brake units are arranged to engage and disengage with a brake disc rotated by the drive motor.

10 . The elevator according to claim 8 , wherein the safety brake units are arranged to engage and disengage with a brake drum rotated by the drive motor.

11 . Method A method for testing safety brake units in the elevator of claim 8 , the elevator comprising at least two safety brake units of the driving machinery, each safety brake unit comprising N movable elements, where N is an integer greater than one, the method comprising:
a) actuating less than N, movable elements of a first safety brake unit and providing, with a drive motor, a test torque to test the actuated movable elements of the first safety brake unit.

12 . The method according to claim 11 , comprising:
at step a), actuating simultaneously all N movable elements of another safety brake unit.

13 . The method according to claim 11 , comprising:
actuating all movable elements of the other safety brake units while keeping all movable elements of a first safety brake unit open, and providing, with a drive motor, a test torque to test the actuated movable elements of the other safety brake units.

14 . The method according to claim 11 , comprising:
after step a), repeating the test symmetrically to all the safety brake units.

15 . The elevator safety brake unit according to claim 2 , wherein the movable elements pushed by the compression springs of the safety brake unit are configured to engage and disengage with different electromagnet currents.

16 . The elevator safety brake unit according to claim 4 , wherein the engagement and disengagement of the movable elements is actuated by gradually changing the current in the coil assembly of the electromagnet in the brake unit.

17 . The elevator safety brake unit according to claim 4 , wherein the movable elements are arranged to engage and disengage one after the other.

18 . The elevator safety brake unit according to claim 5 , wherein the movable elements are arranged to engage and disengage one after the other.

19 . The elevator safety brake unit according to claim 2 , wherein the type of the safety brake unit is one of the following: a shoe brake, a drum brake, a disc brake.

20 . The elevator safety brake unit according to claim 3 , wherein the type of the safety brake unit is one of the following: a shoe brake, a drum brake, a disc brake.

Assignees

• Kone Corp

Inventors

• Lappalainen Joni
• Wenlin Henri
• Saarelainen Antti
• Alkula Petri
• Hurri Lasse
• Burakov Andrej
• Ranta Leena

Classifications

• G01L5/28 Primary

  for testing brakes · CPC title

• B66B1/32

  effective on braking devices {, e.g. acting on electrically controlled brakes (brake control H02P, lift brakes per se B66B5/02)} · CPC title

• B66B5/20 Primary

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

• B66B5/0093

  Testing of safety devices · CPC title

• F16D65/14

  Actuating mechanisms for brakes; Means for initiating operation at a predetermined position (brake control systems, parts thereof B60T) · CPC title