| 摘要 |
<p>A hoisting device comprises a cable (12) controlled at one end by a conventional crane winch assembly (14) and at the other end by a traction winch assembly comprising traction device (15) and storage winch (16). Hook (10) is raised and lowered using the crane winch assembly and/or traction winch assembly depending upon whether the operation requires critical control or long haul travel.</p> |
