Patent ID: 7802658

Claim:
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.