| 摘要 |
A load or cargo lifting and moving apparatus for use with a hoisting hook includes a sling or cable for securing to a load, and a special pulley for balancing the loaded sling and lifting it. The pulley includes a shackle and a roller having a deeply grooved and knurled surface for engaging the sling, and a pin for locking the roller against rotation in the shackle. In operation the sling is initially secured to the load, the pulley is raised with the roller free to rotate, until the load is balanced, and the roller is then pinned against rotation as the load is moved to its final location. The sling may be provided with hooks for engaging a load, which could be a long unbalanced pipe, for example.
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