Abstract A boom extension and contraction mechanism for a crane apparatus includes: a flow passage switching mechanism that 5 switches a flow passage of the hydraulic oil between the cylinder-to-boom connection switching cylinder side and the boom member connection switching cylinder side; a hose reel configured to reel out a hydraulic hose as a telescopic cylinder is extending, and to reel off the hydraulic hose as the 10 telescopic cylinder is contracting; a cable used to supply power and transmit a signal between a swivel base and a boom; and a cord reel configured to reel out the cable as the telescopic cylinder is extending and to reel of f the cable as the telescopic cylinder is contracting. The code reel and the hose reel are 15 arranged on the base in a direction in which the boom extends and contracts.


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    Title :

    Boom extension and contraction mechanism for crane apparatus


    Contributors:

    Publication date :

    2015-12-24


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66C Krane , CRANES



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