Patent ID: 8235179
Filing Date: 2012-08-07
Classification: B66B

Abstract:
1. An elevator without counterweight, 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 first and second rope portions, wherein the elevator car includes one or more first diverting pulleys from which the first rope portions extend upward from both sides of the one or more first diverting pulleys, wherein the elevator car includes one or more second diverting pulleys from which the second rope portions extend downward from both sides of the one or more second diverting pulleys, wherein the first rope portions are under a first rope tension, wherein the second rope portions are under a second rope tension that is different from the first rope tension, wherein the compensating device acts in substantially opposite directions on the first and second rope portions in order to do one or more of the following: wherein the compensating device produces an auxiliary force acting substantially in a same direction as the first rope tension, and wherein the compensating device includes: