PROBLEM TO BE SOLVED: To provide a speed increase valve capable of being suitably used as a boom extension mechanism of a crane.SOLUTION: A speed increase valve 40 controls extension operation speed of a rod 16a of a double-acting hydraulic cylinder 16; can be set to a speed mode of performing extension operation faster than normally, or to a power mode of performing normal extension operation; transfers to the speed mode at external force non-action time in which predetermined or more external force does not acts on the rod 16a; and transfers to the power mode at external force action time in which the predetermined or more external force acts on the rod 16a.SELECTED DRAWING: Figure 2

    【課題】クレーンのブーム伸縮機構として好適に用い得る増速弁を提供する。【解決手段】この増速弁40は、複動油圧シリンダ16のロッド16aの伸長作動速度を制御するものであって、通常よりも速い伸長作動を行わせるスピードモードと、通常の伸長作動を行わせるパワーモードとに設定可能とされており、ロッド16aに所定以上の外力が作用していない外力非作用時にはスピードモードに移行し、ロッド16aに所定以上の外力が作用した外力作用時にはパワーモードに移行するように構成されている。【選択図】図2


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    Title :

    SPEED INCREASE VALVE AND FOLDING TYPE CRANE INCLUDING THE SAME


    Additional title:

    増速弁およびこれを備える折り曲げ式クレーン


    Contributors:

    Publication date :

    2016-06-23


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B66C Krane , CRANES



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