Elevator

Patent metadata

Field	Value
Publication number	US-9771244-B2
Application number	US-201514712482-A
Country	US
Kind code	B2
Filing date	May 14, 2015
Priority date	May 19, 2014
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

The invention relates to an elevator comprising
a hoistway; an elevator car vertically movable in the hoistway; a plurality of ropes connected to the car; a rotatable traction member comprising a circumferential traction surface area for each of the several ropes; each rope being arranged to pass around the rotatable traction member resting against a circumferential traction surface area of the traction member; drive machinery for controlling rotation of the rotatable traction member.

The elevator comprises means for detecting displacement of each of the ropes over a first limit position of the rope in the first axial direction of the rotatable traction member, and over a second limit position of the rope in the second axial direction of the traction member; and in that
displacement of one or more of said ropes in axial direction of the rotatable traction member over the first or second limit position is arranged to trigger the drive machinery to stop the rotation of the rotatable traction member.

First claim

The invention claimed is:

1. An elevator comprising
an elevator car vertically movable in a hoistway;
a plurality of ropes connected to the elevator car;
a rotatable traction member suspended from a top of the hoistway, the rotatable traction member including a plurality of circumferential traction surface areas, each of the plurality of ropes configured to pass around the rotatable traction member within a corresponding one of the circumferential traction surface areas while having a first end directly connected to the elevator car and a second end directly connected to a counterweight such that the rotatable traction member sustains a weight of the elevator car and the counterweight in the hoistway;
a drive machinery configured to control rotation of the rotatable traction member;
a detector configured to detect displacement of each of the ropes over a first limit position in a first axial direction of the rotatable traction member, and over a second limit position in a second axial direction of the traction member, the detector including sensing members at the first limit position and the second limit position that are pivotally displaceable around an axis parallel with an axis of the rotatable traction member; and
a controller configured stop the drive machinery from rotating the rotatable traction member based on the detector detecting the displacement over one or more of the first limit position and the second limit position.

2. The elevator according to claim 1 , wherein
the first sensing member is at the first limit position, the first sensing member configured to trigger the controller to instruct the drive machinery to stop the rotation of the rotatable traction member in response a respective one of the plurality of ropes colliding into and displacing the first sensing member, and
the second sensing member is at the second limit position, the second sensing member configured to trigger the controller to instruct the drive machinery to stop the rotation of the rotatable traction member in response a respective one of the plurality of ropes colliding into and displacing the second sensing member.

3. The elevator according to claim 2 , wherein the sensing members are mounted displaceably via a common displaceable carrier body.

4. The elevator according to claim 3 , wherein the detector comprises:
at least one electrical sensor configured to sense a position of the displaceable carrier body, and wherein
the controller is configured to trigger the controller to instruct the drive machinery to stop the rotation of the traction member, if the position of the displaceable carrier barrier varies pivotably.

5. The elevator according to claim 2 , wherein
the first sensing member and the second sensing member are displaceable at least in a longitudinal direction of respective ones of the plurality of ropes in response to the respective ones of the plurality of ropes colliding into and displacing a respective one of the first sensing member and the second sensing member in a respective one of the first axial direction and the second axial direction.

6. The elevator according to claim 1 , wherein the plurality of ropes are belts.

7. The elevator according to claim 1 , wherein the controller is configured to stop the rotation of the rotatable traction member by braking rotation of the rotatable drive member with mechanical brake(s) of the elevator and/or stopping the motor from rotating the rotatable traction member.

8. The elevator according to claim 1 , wherein the elevator further comprises:
a safety circuit configured to trip in response to the displacement of one of the plurality of ropes to perform a braking procedure, the braking procedure including one or more of braking rotation of the traction member with at least one mechanical brake of the elevator, and stopping the motor from rotating the rotatable traction member.

9. The elevator according to claim 1 , wherein the ropes pass around the rotatable traction member adjacent each other in axial direction of the rotatable traction member as well as in the width-direction of the ropes, the wide sides of the ropes against the traction member.

10. The elevator according to claim 1 , wherein the rotatable traction member is a traction wheel.

11. The elevator according to claim 1 , wherein each circumferential traction surface area of the rotatable traction member has an individual crowning shape.

12. The elevator according to claim 1 , wherein the drive machinery comprises:
a motor configured to rotate the rotatable traction member.

13. An elevator comprising:
an elevator car vertically movable in a hoistway;
a plurality of ropes connected to the elevator car;
a rotatable traction member including a plurality of circumferential traction surface areas, each of the plurality of ropes configured to pass around the rotatable traction member within a corresponding one of the circumferential traction surface areas;
a drive machinery configured to control rotation of the rotatable traction member;
a detector configured to detect displacement of each of the ropes over a first limit position in a first axial direction of the rotatable traction member, and over a second limit position in a second axial direction of the traction member, the detector including sensing members positioned at the first limit position and the second limit position and mounted pivotally displaceable around an axis parallel with the first axial direction and the second axial direction of the traction member; and
a controller configured stop the drive machinery from rotating the rotatable traction member based on the detector detecting, via pivotal displacement of one or more of the sensing members, the displacement of one of the plurality of ropes over one or more of the first limit position and the second limit position.

Assignees

• Lehtinen Hannu
• Lampinen Riku
• Anttila Markku
• Ciuculescu Gabriel
• Salmi Markus
• Puranen Mikko
• Kone Corp

Inventors

• Lehtinen Hannu
• Lampinen Riku
• Anttila Markku
• Ciuculescu Gabriel
• Salmi Markus
• Puranen Mikko

Classifications

• B66B7/1215 Primary

  specially adapted for ropes or cables · CPC title

• B66B5/022

  where the abnormal operating condition is caused by a natural event, e.g. earthquake · CPC title

• B66B5/0031

  for safety reasons · CPC title

• B66B7/06 Primary

  Arrangements of ropes or cables · CPC title

• B66B5/00

  Applications of checking, fault-correcting, or safety devices in elevators · CPC title