Disclosed is a raisable-lowerable member which comprises a boom and a jib. The boom comprises a first supporting portion configured to rotatably support a jib foot when the jib is set in a protruding posture; and a second supporting portion configured to rotatably support a supportable portion of the jib when the jib is set in an enfolded posture. A position adjusting and holding unit of the jib is configured to couple, to the frame, a specific site of the second link in such a manner that a relative position of the second link with respect to the frame in a rotational direction of the second link is adjustably changed to allow the rotational axis of the second joint portion to become coincident with the rotational axis of the jib foot, and to hold the second link at the changed relative position.


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    Titel :

    Raisable-lowerable member


    Beteiligte:
    INADA KEIKO (Autor:in) / KUROTSU HITOSHI (Autor:in) / TAKAOKA DAISUKE (Autor:in) / ICHIKAWA YASUO (Autor:in) / MIYA EIJI (Autor:in)

    Erscheinungsdatum :

    22.09.2015


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    B66C Krane , CRANES



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