| 摘要 |
A device for suspending a working cage includes an arm, a swivel arm mounted rotatably horizontally to the end portion of the arm, a first sheave mounted rotatably horizontally to the arm at a location behind the end portion to which the swivel arm is mounted, and a second sheave mounted rotatably horizontally to the swivel arm in front of the center of rotation of the swivel arm. The first and second sheaves have the same diameter and are formed with at least two vertically arranged wire rope engaging grooves. At least two wire ropes fed from a winding device and attached to a working cage through these sheaves cross each other between the first sheave and the second sheave. The distance between the center of rotation of the swivel arm and the center of rotation of the first sheave is determined to be equal to the distance between the center of rotation of the swivel arm and the center of rotaion of the second sheave. By this arrangement, entwining of wire ropes and inclination of the working cage due to imbalance in length of respective wire ropes can be prevented.
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