| 摘要 |
<p>The device is arranged on a jib (1), especially of a luffing crane, and has a pair of pulleys (2) with a first pulley (4) on the end of the jib with its longitudinal axis perpendicular to that of the jib and a second (7) whose inlet side and outlet side are coaxial with the outlet side of the first pulley. The second pulley is set back on the longitudinal axis of the jib relative to the outlet side of the first pulley.</p> |
