Patent ID: 7806237
Filing Date: 2010-10-05
Classification: B66B

Abstract:
1. An elevator, comprising: an elevator car without counterweight; a plurality of first diverting pulleys on the elevator car; a plurality of second diverting pulleys on the elevator car; a hoisting rope or two or more parallel hoisting ropes; a traction sheave disposed in a first location that is fixed relative to an elevator shaft of the elevator; and a compensating system including a first part and a second part; wherein the elevator car is suspended by the plurality of first and second diverting pulleys on the hoisting rope or two or more parallel hoisting ropes, wherein the traction sheave moves the elevator car using the hoisting rope or two or more parallel hoisting ropes, wherein the first and second ends of the hoisting rope are operatively attached to the compensating system or first and second ends of the two or more parallel hoisting ropes are operatively attached to the compensating system, wherein the hoisting rope has rope portions going upward from the first diverting pulleys or the two or more parallel hoisting ropes have rope portions going upward from the first diverting pulleys, wherein the hoisting rope has rope portions going downward from the second diverting pulleys or the two or more parallel hoisting ropes have rope portions going downward from the second diverting pulleys, wherein the rope portions going upward from the first diverting pulleys are under a first rope tension, wherein the rope portions going downward from the second diverting pulleys are under a second rope tension, wherein the first part of the compensating system is disposed in a second location that is fixed relative to the elevator shaft of the elevator, wherein the second part of the compensating system moves with respect to the first part of the compensating system when the elevator car moves upward or downward, wherein the compensating system acts on the hoisting rope or two or more parallel hoisting ropes to perform one or more of equalizing tension in the hoisting rope or two or more parallel hoisting ropes, compensating tension in the hoisting rope or two or more parallel hoisting ropes, equalizing elongation in the hoisting rope or two or more parallel hoisting ropes, compensating elongation in the hoisting rope or two or more parallel hoisting ropes, and keeping a ration of the first rope tension to the second rope tension substantially constant, wherein the compensating system further includes a device to dampen, lock, or dampen and lock the compensating system, wherein in a situation where an acceleration, a speed, or the acceleration and the speed of the compensating system increases above a pre-defined limit value, the device retards or prevents operation of the compensating system, 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.