BOOSTER FOR HIGH-LIFT WORK VEHICLE

PROBLEM TO BE SOLVED: To provide a booster for a high-lift work vehicle which shortens a time necessary for crimp work.SOLUTION: A booster 12 for a high-lift work vehicle 1 comprises a pressure sensor 14 for detecting the pressure of a working fluid which is sent to a hydraulic tool (hydraulic crimp tool 100), and a control device 31 for controlling an electromagnetic changeover valve 24 while recognizing the pressure transition of the working fluid on the basis of a signal from the pressure sensor 14. When it is determined that the pressure of the working fluid reaches a prescribed value (prescribed pressure P) in the middle of the decompression of the working fluid which is sent to the hydraulic tool, the control device 31 controls the electromagnetic changeover valve (original pressure changeover valve 24), switches a state that the working fluid is supplied to a decompression oil passage 25 to a state that the working fluid is not supplied to the decompression oil passage 25, and interrupts an operation of a movable part 100a of the hydraulic tool when a prescribed time (prescribed time T) elapses from the determination that the pressure of the working fluid reaches the prescribed value.SELECTED DRAWING: Figure 9 【課題】圧着作業に要する時間が短くなる高所作業車用の増圧装置を提供する。【解決手段】高所作業車１用の増圧装置１２において、油圧工具（油圧式圧着工具１００）へ送られる作動油の圧力を検出する圧力センサ１４と、圧力センサ１４からの信号に基づいて作動油の圧力推移を認識しつつ電磁切換弁２４を制御する制御装置３１と、を具備し、制御装置３１は、油圧工具へ送られる作動油を減圧している途中で作動油の圧力が所定値（所定圧力Ｐ）になったと判断したときに、電磁切換弁（本圧用切換弁２４）を制御して減圧油路２５に作動油を供給する状態から減圧油路２５に作動油を供給しない状態に切り換え、所定値になったと判断したときから所定時間（所定時間Ｔ）を経過したときに、油圧工具の可動部１００ａを途中停止させる、とした。【選択図】図９