To provide a high lift work vehicle capable of achieving light weight of a two-joint jib mechanism by efficiently controlling operations of two hydraulic cylinders provided in the two-joint jib mechanism.SOLUTION: A hydraulic cylinder operation control device swings an intermediate link member 20 by a first cylinder from a storage position P0 to a switching angle θ1a, swings a jib 30 by a second hydraulic cylinder until the second hydraulic cylinder becomes a fully elongated state from a fully contracted state in a state where the intermediate link member 20 is at the switching angle θ1a, and swings the intermediate link member 20 by the first cylinder from the switching angle θ1a to a fully developed position P3 in a state where the second hydraulic cylinder is fully elongated. The switching angle θ1a is an angle where a drive moment generated by the second cylinder with respect to the jib 30 exceeds a load moment generated by the jib 30 within the range from the fully contracted state to the fully elongated state of the second hydraulic cylinder.SELECTED DRAWING: Figure 10

    【課題】二関節式ジブ機構に設けられた2つの油圧シリンダを効率よく作動制御することにより二関節式ジブ機構の軽量化を図ることができる高所作業車を提供する。【解決手段】油圧シリンダ作動制御装置は、格納位置P0から切替角度θ1aまでは第1油圧シリンダにより中間リンク部材20を揺動作動し、中間リンク部材20が切替角度θ1aの状態で、第2油圧シリンダが全縮小状態から全伸長状態となるまでは第2油圧シリンダによりジブ30を揺動作動し、第2油圧シリンダが全伸長状態の状態で、切替角度θ1aから全展開位置P3までは第1油圧シリンダにより中間リンク部材20を揺動作動し、切替角度θ1aは、第2油圧シリンダの全縮小状態から全伸長状態までの範囲内で、第2油圧シリンダがジブ30に対して発生する駆動モーメントが、ジブ30による負荷モーメントを上回ることとなる角度である。【選択図】図10


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    Title :

    HIGH LIFT WORK VEHICLE


    Additional title:

    高所作業車


    Contributors:

    Publication date :

    2022-06-15


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last



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