PROBLEM TO BE SOLVED: To achieve both reduction of a burden on an operator and improvement in convenience of a telescopic boom.SOLUTION: A boom extension device of a crane operates a normal fluid circuit or a differential fluid circuit of a fluid circuit 14 and slides a plurality of boom members with a common telescopic cylinder 12. After an operation lever 95 is operated to an extension side and starts the extension of the telescopic boom by utilizing the differential fluid circuit, and when the operation lever 95 is operated again to the extension side, a control part 93 selects the normal fluid circuit. By the re-operation of the operation lever 95, it is switched from the operation utilizing the differential fluid circuit to the operation with the normal fluid circuit, and the telescopic boom is extended.

    【課題】クレーンにおいて、作業者の負担を軽減することと、伸縮ブームの利便性を向上することとを両立する。【解決手段】クレーンのブーム伸縮装置は、流体回路14の通常流体回路または差動流体回路を動作させて、複数のブーム部材を共通の伸縮シリンダ12でスライド移動させる。操作レバー95が伸長側へ操作されて差動流体回路を利用した伸縮ブームの伸長を開始した後に、操作レバー95が伸長側へ再操作された場合、制御部93は通常流体回路を選択する。操作レバー95の再操作により、差動流体回路を利用した動作から、通常流体回路による動作に切り替わり、伸縮ブームが伸長する。【選択図】図3


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    Title :

    BOOM EXTENSION DEVICE OF CRANE


    Additional title:

    クレーンのブーム伸縮装置


    Contributors:

    Publication date :

    2015-06-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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