Patent ID: 8127893
Filing Date: 2012-03-06
Classification: B66B

Abstract:
1. An elevator, comprising: an elevator car; a car-supporting frame supporting the elevator car, the car-supporting frame having guide devices and a horizontal beam above the elevator car, the horizontal beam extending between the guide devices, and the guide devices being configured to guide the elevator car along guide rails; a first set of diverting pulleys on the horizontal beam; a second set of diverting pulleys on the horizontal beam; and a set of hoisting ropes; wherein the hoisting ropes go downward from each diverting pulley of the first set of diverting pulleys, wherein the hoisting ropes go upward from each diverting pulley of the second set of diverting pulleys, wherein a first rope tension in rope portions of the hoisting ropes going downward from each diverting pulley of the first set of diverting pulleys is smaller than a second rope tension in rope portions of the hoisting ropes going upward from each diverting pulley of the second set of diverting pulleys by a specified ratio, and wherein a first average distance, measured from a vertical plane of the car-supporting frame to all of the diverting pulleys of the first set of diverting pulleys, is larger than a second average distance, measured from the vertical plane of the car-supporting frame to all of the diverting pulleys of the second set of diverting pulleys.