Pulley for guiding a belt for carrying a car and/or a counterweight of an elevator system

Patent metadata

Field	Value
Publication number	US-12012304-B2
Application number	US-202117998503-A
Country	US
Kind code	B2
Filing date	May 17, 2021
Priority date	May 18, 2020
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

A pulley for guiding a belt for carrying a car and/or a counterweight of an elevator system has a plurality of peripheral, axially spaced channels for receiving ribs of the belt. Each of the channels has two opposing channel flanks for force transmission by frictional engagement with one of the ribs and a peripheral groove between the two channel flanks. A width of the groove is at least 25 percent of an axial spacing of the channels and at least 80 percent of a height of the channels.

First claim

The invention claimed is:

1. A pulley for guiding a belt for carrying a car and/or a counterweight of an elevator system, the pulley comprising:
the pulley having a lateral surface extending around a periphery of the pulley with a plurality of peripheral, spaced channels formed in the lateral surface for accommodating ribs of the belt, the channels being axially spaced along an axis of rotation of the pulley;
wherein each of the channels has two opposing channel flanks for force transmission by frictional engagement with one of the ribs and a peripheral groove extending between the two channel flanks, the groove adjoining the two channel flanks and having a bottom extending parallel to the axis of rotation of the pulley, the bottom of the groove being spaced from the two channel flanks and forming a bottom of the channel;
wherein a width of the bottom of the groove is at least 25 percent of an axial spacing of the channels and at least 80 percent of a height of the channels; and
wherein the two opposing channel flanks form a wedge-shaped profile of each of the channels and the channel flanks run in a straight line.

2. The pulley according to claim 1 wherein the width of the groove is between 1 mm and 3 mm.

3. The pulley according to claim 1 wherein the axial spacing of the channels is between 4 mm and 6 mm.

4. The pulley according to claim 1 wherein the height of the channels is between 2 mm and 3 mm.

5. The pulley according to claim 1 wherein a depth of the groove is greater than 0.5 mm.

6. The pulley according to claim 1 wherein a diameter of the pulley is between 52 mm and 150 mm.

7. The pulley according to claim 6 wherein the diameter of the pulley is between 80 mm and 100 mm.

8. The pulley according to claim 7 wherein the diameter of the pulley is 87 mm.

9. The pulley according to claim 1 wherein the groove has a rectangular cross section with corners of the groove being rounded.

10. The pulley according to claim 1 wherein the two opposing channel flanks are oriented at an angle of at least 90 degrees to one another.

11. The pulley according to claim 1 wherein the two opposing channel flanks are each planar.

12. The pulley according to claim 1 wherein the two opposing channel flanks are each curved.

13. The pulley according to claim 12 wherein a climbing angle of the channel flanks relative to the axis of rotation of the pulley is at least 35 degrees.

14. A device for carrying a car and/or a counterweight of an elevator system, the device comprising:
at least one belt having a plurality of ribs extending in a longitudinal direction of the belt; and
at least one pulley according to claim 1 , wherein the at least one belt at least partially wraps around the at least one pulley and each of the ribs is received by an associated one of the channels of the pulley.

15. The device according to claim 14 wherein the ribs and/or the channels are formed such that the ribs touch the at least one pulley exclusively on the channel flanks of the channels.

16. An elevator system comprising:
an elevator car;
a counterweight; and
the device according to claim 14 wherein the car and/or the counterweight is carried by the at least one belt of the device.

17. A pulley for guiding a belt for carrying a car and/or a counterweight of an elevator system, the pulley comprising:
the pulley having a lateral surface extending around a periphery of the pulley with a plurality of peripheral, axially spaced channels formed in the lateral surface for accommodating ribs of the belt, wherein an axial spacing of the channels is between 4 mm and 6 mm;
wherein a diameter of the pulley is between 52 mm and 150 mm;
wherein each of the channels has two opposing channel flanks for force transmission by frictional engagement with one of the ribs and a peripheral groove between the two channel flanks, wherein a width of the groove is between 1 mm and 3 mm, a height of the channels is between 2 mm and 3 mm, and a depth of the groove is greater than 0.5 mm; and
wherein the two opposing channel flanks form a wedge-shaped profile of each of the channels and the channel flanks run in a straight line.

18. A pulley for guiding a belt for carrying a car and/or a counterweight of an elevator system, the pulley comprising:
the pulley having a lateral surface extending around a periphery of the pulley with a plurality of peripheral, axially spaced channels formed in the lateral surface for accommodating ribs of the belt;
wherein each of the channels has two opposing channel flanks for force transmission by frictional engagement with one of the ribs, the two opposing channel flanks having a wedge-shaped truncated cone profile forming an outer portion of the channel, and a peripheral groove forming an inner portion of the channel adjoining the two channel flanks as an undercut region; and
wherein the groove has opposed wall surfaces extending orthogonal to an axis of rotation of the pulley and connecting the channel flanks with a bottom of the groove, and wherein a width of the groove between the wall surfaces is at least 25 percent of an axial spacing of the channels and at least 80 percent of a height of the channels from the lateral surface to the bottom of the groove.

Assignees

• Inventio Ag

Inventors

• Dold Florian

Classifications

• B66B15/04

  Friction sheaves; "Koepe" pulleys · CPC title

• B66B15/02 Primary

  Rope or cable carriers · CPC title