Arrangement for adjusting the tautness of a traction member of an elevator

Patent metadata

Field	Value
Publication number	US-10322908-B2
Application number	US-201715720269-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Apr 27, 2015
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

The object of the invention is an arrangement for adjusting the tautness of a traction member of an elevator, which arrangement comprises an elevator car and a compensating weight, which are for their part connected to support the elevator car by the aid of a suspension member, such as a rope or belt, and also a hoisting machine provided with a traction sheave, and one traction member, such as a belt, which is adapted to transmit the rotational movement of the traction sheave into movement of the elevator car and of the compensating weight, and also a tension control means, which is arranged to adjust the magnitude of the tension forces exerted on the suspension member and on the traction member. The arrangement comprises a tensioning means connected to the traction member, and the tension control means is connected to that part of the traction member that is on the side of the compensating weight with respect to the traction sheave, and the tensioning means is connected to that part of the traction member that is on the side of the elevator car with respect to the traction sheave.

First claim

The invention claimed is:

1. An arrangement to adjust a tautness of a traction member of an elevator, the arrangement comprising:
an elevator car adapted to move reciprocally in an elevator hoistway; and
a compensating weight connected to the elevator car via at least one suspension member to support the elevator car;
a hoisting machine including at least one traction sheave and at least one traction member configured to transmit rotational movement of the traction sheave into movement of the elevator car and of the compensating weight, the traction member including a first end and a second end, the traction member being wound about the traction sheave such that one portion of the traction member is on a side of the elevator car with respect to the at least one traction sheave;
a tension control device connected to the suspension member and the traction member, the tension control device configured to adjust a magnitude of tension forces exerted on the suspension member and on the traction member when the tension forces are within an operating range, the suspension member includes a first end and a second end; and
a tensioning device connected between the elevator car and the first end of the traction member such that the tensioning device is connected to only the one portion of the traction member on the side of the elevator car with respect to the at least one traction sheave and adjusts the tautness of the traction member to increase the operating range of the tension control device.

2. The arrangement according to claim 1 , wherein
the tension control device is a fixing point of the second end of the traction member, the fixing point associated with the second end of the traction member being a first horizontal distance from a fixing point of the compensating weight, and
the tension control device is a fixing point of the second end of the suspension member, the fixing point associated with the second end of the suspension member being a second horizontal distance from the fixing point of the compensating weight, the second horizontal distance being smaller than or equal to the first horizontal distance.

3. The arrangement according to claim 2 , wherein
the traction member is configured to travel to the compensating weight over the tension control device and detach from the tension control device at a first detachment point and running to the elevator car and a second detachment point and running to the compensating weight such that the first detachment point is relatively closer to the elevator car than the second detachment point and the second detachment point is relatively closer to a lifting point of the compensating weight than the first detachment point, and
a lever ratio of the tension control device is defined by a distance from the lifting point to the first detachment point over a distance from the lifting point to the second detachment point.

4. The arrangement according to claim 1 , wherein at the tension control device is configured to divide forces acting on the traction member and on the suspension member based on a lever ratio.

5. The arrangement according to claim 1 , wherein the tension control device includes a fixing point of the second end of the suspension member, the fixing point of the suspension member in the tension control device being between a fixing point of the compensation weight and the fixing point associated with the second end of the traction member in a horizontal direction.

6. The arrangement according to claim 1 , wherein the first end of the traction member is fixed to the elevator car via a spring providing a constant tensioning force and the second end of the traction member is connected to the tension control device that distributes the tension forces to both the suspension member and the traction member based on a lever ratio.

7. The arrangement according to claim 1 , wherein the tension control device has a rod-shaped frame part, the rod-shaped frame part having a first end that includes a fixing point associated with the second end of the traction member and a second end having a fixing point associated with the compensating weight such that, between the first end and the second end of the rod-shaped frame part is a fixing point associated with the second end of the suspension member.

8. The arrangement according to claim 7 , wherein the traction member, the compensating weight and the suspension member are connected to their respective fixing points via a shaft extension or hinge.

9. The arrangement according to claim 1 , wherein, as viewed from above, a fixing point associated with connecting the second end of the traction member to the tension control device is disposed outside an area of travel formed by a cross-section of the compensating weight.

10. The arrangement according to claim 1 , wherein the tension control device is a diverting pulley, over which the traction member is lead to travel from the elevator car to the compensating weight, the diverting pulley including a shaft connected to the second end of the suspension member.

11. An arrangement to adjust a tautness of a traction member of an elevator that includes a suspension member that is separate from the traction member, each of the traction member and the suspension member having a first end and a second end, the arrangement comprising:
a tension control device connected to the suspension member and the second end of traction member, the tension control device configured to adjust a magnitude of tension forces exerted on the suspension member and on the traction member when the tension forces are within an operating range; and
a tensioning device connected between the elevator and the first end of the traction member, the tensioning device configured to provide a constant tensing force between the elevator and a hoisting machine such that the tensioning device is connected to only one portion of the traction member on a side of the elevator with respect to at least one traction sheave and adjusts the tautness of the traction member to increase the operating range of the tension control device.

12. The arrangement of claim 11 , wherein
the second end of the suspension member is connected to the tension control device and the first end of the suspension member is connected to a top of the elevator,
the tensioning device is connected between a bottom of the elevator and the first end of the traction member, and
the second end of the traction member is connected to the tension control device.

13. The arrangement of claim 12 , wherein
the traction member, the suspension member the elevator and a compensating weight form a closed loop, and
the tension control device is configured to maintain the tautness of at least the traction member in the closed loop independent of a load of the elevator.

14. The arrangement according to claim 11 , wherein the tensioning device is configured to provide the constant tensioning force between the hoisting machine and the first end of the traction member.

15. The arrangement according to claim 11 , wherein the tension control device is configured to adjust the magnitude of the tensioning forces based on a lever ratio associated with the tension control device.

16. The arrangement according to claim 15 , wherein the tension control device includes a first point associated with a compensating weight, a second point associated with the suspension member and a third point associated with the traction member, the second point being arranged between the first point and the third point.

17. The arrangement according to claim 16 ,

Assignees

• Kone Corp

Inventors

• Haapaniemi Markku
• Rasanen Matti
• Mikkonen Janne
• Aulanko Esko

Classifications

• B66B7/10 Primary

  for equalising rope or cable tension · CPC title

• B66B11/009 Primary

  with separate traction and suspension ropes · CPC title

• B66B11/0476

  with friction gear, e.g. belt linking motor to sheave · CPC title