| 摘要 |
<p>A hoisting apparatus comprising a support,a driving pulley rotatably mounted on said support, a cable for supporting a load passing around said driving pulley, at least one roller and a first lever adapted to press said at least one roller against a portion of said cable in order to improve the adherence of the cable to said driving pulley and to exert a wedging action on the cable, a second. lever pivoted on said support and having one end connected to said first lever and: another end connected to said load.</p> |
