Elevator cable tensioning device
AssigneeKone Corporation
InventorsEsko Aulanko, Jorma Mustalahti
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Abstract
An elevator may include an elevator car, two or more diverting pulleys on the elevator car, one or more hoisting ropes, a traction sheave, and a compensating device. The hoisting ropes may include first, second, third, and fourth rope portions. The first rope portions may extend upward from at least one diverting pulley and the second rope portions may extend downward from at least one diverting pulley. The first rope portions may be under a first tension caused by the compensating device acting on the third rope portion and the second rope portions may be under a second tension caused by the compensating device acting on the fourth rope portion. The first tension to the second rope tension may be maintained substantially constant and may be independent of a load of the elevator.
Claims23
An elevator, comprising:
- an elevator car;
- two or more first diverting pulleys on the elevator car;
- two or more second diverting pulleys on the elevator car;
- one or more hoisting ropes;
- a traction sheave;
- and
- a compensating device;
- wherein the elevator car is suspended by the one or more hoisting ropes interacting with the two or more first diverting pulleys and the two or more second diverting pulleys,
- wherein the traction sheave moves the elevator car using the one or more hoisting ropes,
- wherein the one or more hoisting ropes include first, second, third, and fourth rope portions,
- wherein the first rope portions extend upward from both sides of at least one of the two or more first diverting pulleys,
- wherein the second rope portions extend downward from both sides of at least one of the two or more second diverting pulleys,
- wherein the first rope portions are under a first rope tension caused by the compensating device acting on the third rope portion,
- wherein the second rope portions are under a second rope tension caused by the compensating device acting on the fourth rope portion,
- wherein the first rope tension is greater than the second rope tension,
- wherein a ratio of the first rope tension to the second rope tension is maintained at a substantially constant value, and
- wherein the ratio of the first rope tension to the second rope tension is independent of a load of the elevator.
A method for forming an elevator, in place of an earlier elevator mounted in an elevator shaft or by making modifications to the earlier elevator, the method comprising:
- replacing a hoisting function of the earlier elevator with a hoisting function of the elevator;
- providing one or more hoisting ropes;
- and
- arranging a traction sheave to move an elevator car of the elevator using the one or more hoisting ropes;
- wherein the elevator car is suspended by the one or more hoisting ropes interacting with two or more first diverting pulleys on the elevator car and two or more second diverting pulleys on the elevator car,
- wherein the one or more hoisting ropes include first, second, third, and fourth rope portions,
- wherein the first rope portions extend upward from both sides of at least one of the two or more first diverting pulleys,
- wherein the second rope portions extend downward from both sides of at least one of the two or more second diverting pulleys,
- wherein the first rope portions are under a first rope tension caused by a compensating device of the elevator acting on the third rope portion,
- wherein the second rope portions are under a second rope tension caused by the compensating device acting on the fourth rope portion,
- wherein the compensating device maintains a substantially constant ratio of the first rope tension to the second rope tension, and
- wherein the ratio of the first rope tension to the second rope tension is independent of a load of the elevator.
Dependencies are inferred from the claim text.