Provided is an automatic boom extension/contraction device for a work machine in which it is possible to reduce the burden, such as arm or hand fatigue, on a worker inputting an operation for extending or contracting a boom when the worker actuates the boom so as to extend or contact. When, in a state in which an automatic extension/contraction switch (53) is ON, an engine rotation speed equal to or greater than a first predetermined rotation speed (R1) is detected by an engine rotation speed sensor (51) and an operation in which the speed of extension/contraction actuation of a boom (22) is equal to or greater than a predetermined speed is inputted through a boom extension/contraction lever (52), an automatic extension/contraction actuation is performed in which the extension/contraction actuation of the boom (22) is maintained in a state in which an operation of extending/contacting the boom (22) is not inputted through the boom extension/contraction lever (52).


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    Titel :

    AUTOMATIC BOOM TELESCOPIC MOTION APPARATUS FOR WORKING MACHINE


    Weitere Titelangaben:

    AUTOMATISCHE TELESKOPISCHE AUSLEGERBEWEGUNGSVORRICHTUNG FÜR ARBEITSMASCHINE
    DISPOSITIF D'EXTENSION/RÉTRACTION AUTOMATIQUE DE FLÈCHE POUR MACHINE DE TRAVAIL


    Beteiligte:
    IKEDA TOMOHIKO (Autor:in) / SATO TAKETO (Autor:in)

    Erscheinungsdatum :

    2019-09-18


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    B66C Krane , CRANES



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