Tie-down device for compensation sheave, compensation sheave and elevator

Patent metadata

Field	Value
Publication number	US-10150648-B2
Application number	US-201715680508-A
Country	US
Kind code	B2
Filing date	Aug 18, 2017
Priority date	Aug 18, 2016
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A tensioning device for a compensating sheave. The compensating sheave is provided with a housing. The tensioning device comprises: a first snap-fit member; a second snap-fit member; and a trigger mechanism comprising a resilient assembly and a limiting assembly, wherein the limiting assembly is provided with a limiting member, wherein the tensioning device has a first state in which the limiting member abuts against a second end of the first snap-fit member so that a certain clearance is kept between a first end of the first snap-fit member and the second snap-fit member and a second state in which the limiting assembly is moved downward so that the first end of the first snap-fit member is rotated downward until the first end is snap-fitted with the second snap-fit member. A compensating sheave is provided with the above-described tensioning device and an elevator is configured with the above-described compensating sheave.

First claim

What is claimed is:

1. A tensioning device for a compensating sheave, the compensating sheave being provided with a housing, characterized in that, the tensioning device comprises:
a first snap-fit member rotatably fixed on the housing and comprising a first end which is always subjected to a downward force and a second end configured with a cam profile;
a second snap-fit member disposed adjacent to the first snap-fit member; and
a trigger mechanism comprising a resilient assembly for transmitting an acceleration of the compensating sheave and a limiting assembly for triggering the first snap-fit member, wherein the limiting assembly is provided with a limiting member having an arched profile,
wherein the tensioning device has a first state in which the arched profile of the limiting member abuts against the cam profile of the second end of the first snap-fit member so that a certain clearance is kept between the first end of the first snap-fit member and the second snap-fit member and a second state in which the limiting assembly is moved downward so that the first end of the first snap-fit member is rotated downward until the first end is snap-fitted with the second snap-fit member.

2. The tensioning device according to claim 1 , characterized in that, the resilient assembly comprises a second resilient element and a base thereof, and the base is fixed on the housing.

3. The tensioning device according to claim 2 , characterized in that, the limiting assembly further comprises: a stem passing through the second resilient element and fixed to the base; and a weight disposed on the stem and located below the limiting member.

4. The tensioning device according to claim 2 , characterized in that, the second resilient element is a compression spring.

5. The tensioning device according to claim 2 , characterized in that, a longitudinal direction of the second resilient element and a center of the limiting member are arranged in the same vertical direction.

6. The tensioning device according to claim 2 , characterized in that, the second resilient element is provided with a nut for adjusting an elastic force.

7. The tensioning device according to claim 1 , characterized in that, the first snap-fit member is a pawl.

8. The tensioning device according to claim 1 , characterized in that, the second end of the first snap-fit member has a circular chamfer.

9. The tensioning device according to claim 1 , characterized in that, the clearance is not greater than 4 mm.

10. The tensioning device according to claim 1 , characterized in that, the limiting member is configured as a scroll wheel.

11. The tensioning device according to claim 10 , characterized in that, the scroll wheel is configured to be rotatable or non-rotatable about a center.

12. The tensioning device according to claim 1 , characterized in that, the first end of the first snap-fit member is subjected to a downward force of the first resilient element.

13. The tensioning device according to claim 12 , characterized in that, the first resilient element is a spring wire.

14. The tensioning device according to claim 1 , characterized in that, the tensioning device further comprises an additional first snap-fit member and a trigger mechanism.

15. The tensioning device according to claim 1 , characterized in that, the first end of the first snap-fit member is configured as a tip.

16. The tensioning device according to claim 1 , characterized in that, the second snap-fit member is configured as a rack.

17. The tensioning device according to claim 1 , characterized in that, the second snap-fit member is fixed at an elevator pit.

18. The tensioning device according to claim 17 , characterized in that, the second snap-fit member is fixed on a channel steel at the elevator pit by means of welding.

19. A compensating sheave, characterized in that, the compensating sheave is provided with the tensioning device according to claim 1 .

20. An elevator, characterized in that, the elevator is configured with the compensating sheave according to claim 19 .

Assignees

• Otis Elevator Co

Inventors

• Shen Yunzhu

Classifications

• B66B15/02

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• B66B7/068 Primary

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• B66B5/16 Primary

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