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    Articulated crane
    91.
    发明授权
    Articulated crane 失效
    铰链起重机

    公开(公告)号：US3557967A

    公开(公告)日：1971-01-26

    申请号：US3557967D

    申请日：1969-03-10

    申请人： DOYLE L MADOLE

    发明人： MADOLE DOYLE L

    IPC分类号： B66C3/20 ,  B66C23/36 ,  B66C23/68 ,  B66C23/72 ,  B66C23/58

    CPC分类号： B66C23/68 ,  B66C3/20 ,  B66C23/36 ,  B66C23/72 ,  B66C2700/0357 ,  B66C2700/0392

    摘要： An articulated crane is disclosed herein having a turntable base pivotally and rotatably supporting an expandable boom. The boom comprises four beams pivotally connected together substantially at their adjacent ends and adapted to be folded together in a compact storage position and to be extended outwardly from the base so that its free end is cantilevered away from said base. The boom further includes crossover braces pivotally secured between the two innermost beams and the two outermost beams so as to provide a scissorslike extension and retraction of the beams. Hydraulic piston and cylinder assemblages are pivotally interconnected between the base and the first beam of the plurality for effecting initial extension of the boom while a second piston and cylinder assemblage effects refined positioning and extension of the boom via the scissorslike mechanism. Means are operably carried on the extreme free end of the boom for engaging cargo or products intended to be lifted or transferred from one location to another.