Tensioning arrangement for a traction means of an elevator

Patent metadata

Field	Value
Publication number	US-9758346-B2
Application number	US-201314092696-A
Country	US
Kind code	B2
Filing date	Nov 27, 2013
Priority date	Jun 22, 2011
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

The object of the invention is a tensioning arrangement for a traction means of an elevator, which arrangement comprises at least an elevator car configured to move up and down in an elevator hoistway and at least one or more compensating weights, which are for their part connected to support the elevator car by the aid of their own support means, such as by the aid of ropes or belts and also of diverting pulleys, and a hoisting machine provided with at least one traction sheave or corresponding, and also at least one traction means ( 7 ) such as a belt, rope or chain, which is configured to transmit the rotational movement of the traction sheave into movement of the elevator car and of the compensating weights. The traction means ( 7 ) is fixed from at least one of its ends to a fixing means ( 1 ) providing an essentially constant tensioning force.

First claim

The invention claimed is:

1. A tensioning arrangement for an elevator, which arrangement comprises:
at least an elevator car configured to move up and down in an elevator hoistway,
at least one or more compensating weights supporting the elevator car via diverting pulleys, and a hoisting machine provided with at least one traction sheave, and
at least two traction devices configured to transmit the rotational movement of the traction sheave into movement of the elevator car and of the compensating weights,
wherein a first traction device of said at least two traction devices is fixed from at least one of its ends to a first fixing device and a second traction device of said at least two traction devices is fixed from at least one of its ends to a second fixing device, the first fixing device is disposed on a first side of the elevator car and the second fixing device is disposed on a second side of the elevator car opposite to the first side of the elevator car,
wherein the first traction device extends downward from the first fixing device towards a first diverting pulley of said diverting pulleys, around a first side of said at least one traction sheave towards a second diverting pulley of said diverting pulleys and ascending to a first compensating weight of said at least one or more compensating weights,
wherein the second traction device extends downwards from the second fixing device towards a third diverting pulley of said diverting pulleys, around a second side opposite to said first side of said at least one traction sheave towards a fourth diverting pulley of said diverting pulleys, and ascends to a second compensating weight of said at least one or more compensating weights,
wherein each fixing device provides an essentially constant tensioning force to the traction device,
wherein each fixing device comprises a frame having an interior portion enclosing a roll rotatable about an axle and enclosing an adjustment device fitted to said axle, the adjustment device is connected to said roll, and each fixing device further comprises a spring abutting against an outer portion of said frame,
wherein one end of the respective traction device is fixed to a rim of the roll, and
wherein the adjustment device has a surface that is spirally eccentric in relation to an axis of rotation of the roll.

2. The tensioning arrangement according to claim 1 , wherein the respective traction device is fixed to the elevator car via a respective one of the first fixing device and a second fixing device.

3. The tensioning arrangement according to claim 2 , wherein a tensioning device is fixed to the spirally eccentric surface of the adjustment device at a first end thereof.

4. The tensioning arrangement according to claim 1 , wherein a tensioning device is fixed to the spirally eccentric surface of the adjustment device at a first end thereof.

5. The tensioning arrangement according to claim 4 , wherein the eccentricity of the surface of the adjustment device is selected such that it has a spiral pitch that corresponds to a spring constant of the spring.

6. The tensioning arrangement according to claim 5 , wherein when the traction device stretches or otherwise loosens, the spring is arranged to pull the tensioning device so as to rotate the roll and the adjustment device such that a distance of an outer rim of the adjustment device from the axle at a point of detachment of the tensioning device from the roll increases according to the eccentricity of the outer rim.

7. The tensioning arrangement according to claim 1 , wherein a length of an outer rim of the adjustment device is smaller than 360°.

8. The tensioning arrangement according to claim 1 , wherein a length of an outer rim of the adjustment device is greater than 360° including more than one spiral revolution.

9. The tensioning arrangement according to claim 1 , wherein a tensioning device is fixed to the spirally eccentric surface of the adjustment device at a first end thereof.

Assignees

• Kone Corp

Inventors

• Aulanko Esko
• Räsänen Matti
• Mikkonen Janne
• Alasentie Pentti

Classifications

• B66B11/009

  with separate traction and suspension ropes · CPC title

• B66B7/10 Primary

  for equalising rope or cable tension · CPC title

• B66B19/007

  method for modernisation of elevators · CPC title