| 摘要 |
PURPOSE: A boom of a crane is provided to improve working efficiency, and to operate conveniently in a limited space by installing the folding boom in a small vehicle with reducing the weight. CONSTITUTION: A boom of a crane is composed of a boom body having a boom supporting bar, a supporting boom(4), and a first boom(24); a rotating unit turning the boom body; and a hydraulic unit having a hydraulic lift cylinder and a hydraulic pump. A bending boom(30) is installed with mounting a bending unit(10) in the end of the first boom, and an extension boom(40) is installed separably in the bending boom. The inclined angle between the first boom and the bending boom is formed in spreading the bending boom, and the bending unit is composed of a connecting bracket(12), an extension bracket(14) and a fixing bracket(16). The diameter of the first boom is decreased with folding the bending boom, and the weight of the crane is minimized.
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