Brake system

Patent metadata

Field	Value
Publication number	US-9273739-B2
Application number	US-201313768260-A
Country	US
Kind code	B2
Filing date	Feb 15, 2013
Priority date	Feb 17, 2012
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

A brake system of an elevator, an escalator or a moving walkway includes a brake device with at least one brake shoe. The brake shoe has an effective surface which during brake use is pressed against a friction surface, which is moving or movable relative to the effective surface, of a counter-member. The brake system also includes a feed device which is supplied by a fluid source. A fluid can be fed between the effective surface of the brake shoe and the friction surface, which faces it, by means of the feed device. The friction between the effective surface and the friction surface can be influenced by the feed of the fluid.

First claim

We claim:

1. A brake system of an elevator, an escalator, or a moving walkway, the brake system comprising:
a brake device, the brake device comprising a brake shoe, the brake shoe comprising an effective surface, the effective surface being configured to be pressed against a friction surface of a counter member during use, the friction surface moving or being movable relative to the effective surface; and
a feed device coupled to a fluid source, the feed device being configured to control feed of a fluid from the fluid source between the effective surface and the friction surface when the effective surface is pressed against the friction surface, wherein a sliding friction between the effective surface and the friction surface is influenced by the feed of the fluid to provide a predetermined deceleration profile in order to control a transition from the sliding friction to an adhesive friction.

2. The brake system of claim 1 , the feed device comprising a passage formed in the brake shoe, the passage comprising an inlet coupled to the fluid source and an outlet coupled to the effective surface, the fluid source being configured to generate sufficient fluid pressure to feed the fluid between the effective surface and the friction surface when the effective surface and the friction surface are pressed against each other.

3. The brake system of claim 2 , the effective surface of the brake shoe comprising bores or grooves, the outlet being positioned between the bores or between the grooves.

4. The brake system of claim 2 , the passage being a first passage, the feed device further comprising a second passage formed in the brake shoe, the first and second passages being connected to the fluid source by a common supply duct.

5. The brake system of claim 1 , the feed device comprising:
an inlet region formed at the brake shoe; and
a feed line, the feed line comprising an opening directed into the inlet region, the feed line being connected with the fluid source to pass the fluid through the opening and into the inlet region.

6. The brake system of claim 1 , further comprising the fluid source, the fluid source comprising a conveying device.

7. The brake system of claim 6 , the conveying device comprising a pump.

8. The brake system of claim 6 , the conveying device comprising a pressure cylinder.

9. The brake system of claim 6 , the conveying device comprising a gas pressure container.

10. The brake system of claim 1 , further comprising:
a control valve; and
a control, the control being configured to control the control valve for regulation of the feed of the fluid.

11. The brake system of claim 10 , further comprising a sensor for detecting a change of movement of the friction surface relative to the effective surface.

12. The brake system of claim 10 , the control valve being configured to generate a pulsating fluid flow in response to signals from the control.

13. The brake system of claim 1 , the fluid comprising a technical gas.

14. The brake system of claim 13 , the technical gas comprising air or a liquid.

15. The brake system of claim 13 , the liquid comprising a mineral oil without high-pressure additives.

16. The brake system of claim 1 , the brake system being an operating brake, the brake system further comprising a brake drum or a brake disc as the counter member.

17. The brake system of claim 1 , the brake system being a safety brake device configured to brake against a guide rail or against a separately arranged brake rail.

18. The brake system of claim 1 , further comprising a cleaning device, the cleaning device being mounted upstream of the brake shoe and being configured to clean the counter member.

19. A method of braking an elevator cage of an elevator, a step belt of an escalator, or a plate belt of a moving walkway, the method comprising:
activating a brake system, the brake system comprising,
a brake device, the brake device comprising a brake shoe, the brake shoe comprising an effective surface, the effective surface being configured to be pressed against a friction surface of a counter member during use, the friction surface moving or being movable relative to the effective surface, and
a feed device coupled to a fluid source; and
changing a sliding friction between the effective surface and the friction surface when the effective surface is pressed against the friction surface by feeding a predetermined amount of the fluid from the fluid source between the effective surface and the friction surface using the feed device to provide a predetermined deceleration profile in order to control a transition from the sliding friction to an adhesive friction.

20. The method of claim 19 , the brake system further comprising a control with a computer unit and a memory unit, the memory unit storing time-dependent brake use data, the method further comprising calculating control variables for a next braking based on the time-dependent brake use data.

Assignees

• Inventio Ag

Inventors

• Meierhans Daniel
• Osmanbasic Faruk
• Stahli Julian
• Infanger Kurt
• Rothenfluh Roland

Classifications

• B66B1/32

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

• B66B5/22

  by means of linearly-movable wedges (B66B5/24 takes precedence) · CPC title

• B66B5/16 Primary

  Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well · CPC title

• F16D65/06 Primary

  for externally-engaging brakes · CPC title

• F16D65/00

  Parts or details (similar members for clutches F16D13/58) · CPC title