The present invention relates to an elevating boom dropping device for a high place work machine. More specifically, the elevating boom dropping device is installed in the body of a vehicle to install a boom on an elevating bar, which is elevated by the operation of a hydraulic pump, a hydraulic cylinder, and a solenoid valve, and to elevate the boom in accordance with the height of a worktable. To forcibly open or close a duct formed between an oil tank and an upward hydraulic chamber of the hydraulic cylinder, a hydraulic switch operated by a hand or foot is installed in the boom, so when the elevated boom has to be dropped, the hydraulic switch is operated without the operation of the hydraulic pump and the solenoid valve to enable the boom to be dropped without electric power through decompression action which moves oil pressure supplied to the upward hydraulic chamber of the hydraulic cylinder to the oil tank.

    본 발명은 고소작업기의 승강붐 하강장치에 관한 것으로 보다 구체적인 것은, 차체에 장치되어 유압펌프와 유압실린더 및 솔레노이드밸브의 작동에 의거 승강하는 승강대에 붐을 장치하고, 작업장의 높이에 맞추어 붐을 승강시키도록 된 것에 있어서, 유압실린더의 상향쪽 유압실과 오일탱크 사이에 관로를 형성하고 관로를 강제 개폐할 수 있도록 붐내에 손 또는 발로 작동시키는 유압스위치를 장치하여 상승된 붐을 하강시킬 때, 유압펌프와 솔레노이드밸브를 작동시키지 않고 유압스위치를 작동시켜 유압실린더의 상향쪽 유압실에 공급된 유압을 오일탱크로 이동시키는 감압작용을 통해 무동력으로 붐을 하강시킬 수 있게 구성한 고소작업기의 승강붐 하강장치이다.


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    Title :

    Elevating boom lowering device of high working machine


    Additional title:

    고소작업기의 승강붐 하강장치


    Contributors:

    Publication date :

    2019-06-14


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    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 / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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