Patent ID: 8225909

Claim:
An elevator, comprising: an elevator car; a set of hoisting ropes; a traction sheave; and a compensating device; wherein the elevator car is at least partially supported using the set of hoisting ropes, wherein the set of hoisting ropes includes at least one rope or a number of parallel ropes, wherein the traction sheave moves the elevator car using the set of hoisting ropes, wherein the set of hoisting ropes includes at least one first rope portion and at least one second rope portion, wherein the elevator car includes one or more first diverting pulleys from which the at least one first rope portion extends upward, wherein the elevator car includes one or more second diverting pulleys from which the at least one second rope portion extends downward, wherein the at least one first rope portion is under a first rope tension, wherein the at least one second rope portion is under a second rope tension that is different from the first rope tension, wherein the compensating device acts in substantially opposite directions on the at least one first rope portion and the at least one second rope portion; wherein the compensating device produces an auxiliary force acting substantially in a same direction as the first rope tension, wherein the compensating device includes: a third diverting pulley; and a fourth diverting pulley; wherein the at least one first rope portion further extends from one of the one or more first diverting pulleys to the third diverting pulley, wherein the at least one first rope portion passes around the third diverting pulley and is fixed to the fourth pulley, wherein the at least one second rope portion further extends from one of the one or more second diverting pulleys to the fourth diverting pulley, wherein the at least one second rope portion passes around the fourth diverting pulley and is fixed to a fixing point, wherein the fourth pulley acts in substantially opposite directions on the at least one first rope portion and the at least one second rope portion, wherein a force in addition to the first rope tension and second rope tension is arranged in the compensating system, and wherein the force acts essentially in a same direction as the first rope tension.