| 摘要 |
<p>PURPOSE: To provide a light and compact multistage telescopic boom for crane, which facilitates the tensile adjustment of a rope. CONSTITUTION: A second boom 2 - a fifth boom 5 are inserted in order into a first boom 1, and at the time of minimum shrinkage, the base end of the booms following the second boom 2 are projected from the base end of the first boom 1, and a first hydraulic cylinder 10 is arranged outside of the second boom 2 and inside of the first boom 1. A first extension rope adjusting screw 41, a second extension rope adjusting screw 51, a first shrinkage adjusting screw 61, a second shrinkage adjusting screw 71 are respectively arranged outside of the boom. Length of the boom at the time of minimum shrinkage is thereby shortened, and the forward extension length can be prolonged, and the weight of the booms following the second boom 2 can be limited, and the tensile adjustment of a rope after the assembly is facilitated.</p> |
