| 摘要 |
The device applies to a crane having multiple functions, with a modifiable configuration, which comprises a foldable mast, composed of two elements, and a distributing jib, composed of a plurality of successive elements. This device comprises a double-acting jack connecting a lower rod assembly to an upper rod assembly. The lower rod assembly is connected to the lower part of the upper mast element and to the upper part of the lower mast element. The upper rod assembly is connected to the upper part of the upper mast element and to the jib foot.
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