Safety brake configuration for elevator application

Patent metadata

Field	Value
Publication number	US-11124386-B2
Application number	US-201615244703-A
Country	US
Kind code	B2
Filing date	Aug 23, 2016
Priority date	Aug 25, 2015
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

An adjacent safety configuration for an elevator includes a second pair of safeties displaced from a first pair of safeties by at least 0.1 seconds of travel time at a rated speed of the elevator. An adjacent safety configuration for an elevator including a second pair of safeties displaced from the first pair of safeties to provide a predetermined time period before the second pair of safeties pass over a point on a guide rail previously passed over by the first pair of safeties to permit the guide rail surface to decrease by a predetermined temperature. A method of spacing an adjacent safety configuration for an elevator system including de-rating a pair of trailing safeties with respect to a pair of leading safeties as a function of a rated speed of the elevator and a spacing between the pair of trailing safeties and the pair of leading safeties.

First claim

What is claimed is:

1. An adjacent safety brake configuration for an elevator system comprising:
an elevator that is movable at greater than 10 m/s;
a guide rail for the elevator;
a leading safety brake for the elevator, the leading safety brake located inboard of a respective roller guide for the elevator; and
a trailing safety brake for the elevator that trails the leading safety brake along the guide rail, the trailing safety brake located inboard of a respective roller guide for the elevator, the leading safety brake and the trailing safety brake both located on one side of the elevator, the trailing safety brake of a braking capacity less than that of the leading safety brake, the trailing safety brake displaced from the leading safety brake on the elevator by between 1-2 meters and at least 0.1 seconds of travel time at a rated speed of the elevator to provide a predetermined time period before the trailing safety brake passes over a reference point on the guide rail previously passed over by the leading safety brake to permit a guide rail surface adjacent to the reference point to decrease in temperature and increase an overall stopping capacity of the adjacent safety brake configuration.

2. The adjacent safety brake configuration as recited in claim 1 , wherein the leading safety brake and the trailing safety brake are located below the elevator.

3. The adjacent safety brake configuration as recited in claim 1 , wherein the leading safety brake and the trailing safety brake are located above the elevator.

4. An adjacent safety brake configuration for an elevator system comprising:
an elevator that is movable at greater than 10 m/s;
a pair of guide rails for the elevator;
a leading pair of safety brakes for the elevator that ride along the pair of guide rails; and
a trailing pair of safety brakes that trails the leading pair of safety brakes along the pair of guide rails, the leading pair of safety brakes and the trailing pair of safety brakes both located on one side of the elevator, the trailing pair of safety brakes displaced from the leading pair of safety brakes by between 1-2 meters and at least 0.1 seconds of travel time at a rated speed of the elevator to provide a predetermined time period before the trailing pair of safety brakes pass over a reference point on each guide rail of the pair of guide rails previously passed over by the leading pair of safety brakes to permit a guide rail surface of each of the pair of guide rails adjacent to the reference point to decrease by a predetermined temperature and increase an overall stopping capacity of the adjacent safety brake configuration; and
a third pair of safety brakes on an opposite side of the elevator that ride along the pair of guide rails opposite the leading pair of safety brakes and the trailing pair of safety brakes.

5. The adjacent safety brake configuration as recited in claim 4 , wherein the leading pair of safety brakes and the trailing pair of safety brakes are located below the elevator.

6. The adjacent safety configuration as recited in claim 4 , wherein the leading pair of safety brakes and the trailing pair of safety brakes are located above the elevator.

7. The adjacent safety brake configuration as recited in claim 4 , wherein the braking capacity of the pair of trailing safety brakes are de-rated in the calculation of the overall stopping capacity of the safety brake system such that the pair of trailing safety brakes are relatively less effective than the leading safety brakes.

8. A method of configuring an adjacent safety brake system for an elevator system to reduce degradation of performance due to heating of a guide rail, comprising:
de-rating a braking capacity for the adjacent safety brake system by reducing a braking capacity of a pair of trailing safety brakes with respect to a pair of leading safety brakes of the safety brake system for an elevator that is moving at greater than 10 m/s to achieve a desired capacity for the adjacent safety brake system as a function of a rated speed of the elevator and a spacing between the pair of trailing safety brakes and the pair of leading safety brakes by between 1-2 meters and at least 0.1 seconds of travel time at the rated speed of the elevator, wherein a second pair of safety brakes are displaced from the leading pair of safety brakes to provide a predetermined time period before the trailing pair of safety brakes pass over a reference point on a guide rail previously passed over by the leading pair of safety brakes to permit a guide rail surface adjacent to the reference point to decrease by a predetermined temperature such that the spacing increases an overall stopping capacity of the adjacent safety brake system.

9. The method as recited in claim 8 , further comprising locating the pair of trailing safety brakes and the pair of leading safety brakes below the elevator, and a third pair of safety brakes above the elevator.

10. The method as recited in claim 8 , further comprising locating the pair of trailing safety brakes and the pair of leading safety brakes above the elevator, and a third pair of safety brakes below the elevator.

Assignees

• Otis Elevator Co

Inventors

• Fargo Richard N
• Liang Duan
• El-Wardany Tahany Ibrahim
• Draper James M
• Luo Xiaodong
• Liou Joe J

Classifications

• B66B5/18 Primary

  and applying frictional retarding forces · CPC title

• B66B11/0213

  for multi-deck cars · CPC title

• B66B9/00

  Kinds or types of lifts in, or associated with, buildings or other structures (characterised by control systems B66B1/00; apparatus for raising or lowering persons on stages of theatres A63J5/12) · 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