Provided is a jack device (20) rendering an operation of changing the posture of a jack cylinder (41) easy without using a device that actively changes the posture. The jack device (20) includes an arm (30), a jack body (40) including the jack cylinder (41), and a reaction-force application unit (60) supported by the arm (30). The reaction-force application unit (60) makes a reaction-force moment act on the jack body (40) in all postures from the upright posture to the storage posture in response to a force applied from the jack body (40). The reaction-force application unit (60) makes a reaction-force moment (Mr) greater than a self-weight moment (Ms) act on the jack body (40) in the storage posture and makes a reaction-force moment (Mr) smaller than the self-weight moment (Ms) act on the jack body (40) in the upright posture.


    Access

    Download


    Export, share and cite



    Title :

    JACK DEVICE AND WORK MACHINE EQUIPPED WITH SAME


    Additional title:

    BUCHSENVORRICHTUNG UND ARBEITSMASCHINE DAMIT
    DISPOSITIF DE VÉRIN ET MACHINE DE TRAVAIL ÉQUIPÉE DE CELUI-CI


    Contributors:

    Publication date :

    2025-03-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66C Krane , CRANES / E02F Baggern , DREDGING



    JACK DEVICE AND WORK MACHINE EQUIPPED WITH SAME

    ARITA RYUICHI | European Patent Office | 2023

    Free access

    JACK DEVICE AND WORK MACHINE EQUIPPED WITH SAME

    ARITA RYUICHI | European Patent Office | 2022

    Free access

    JACK DEVICE AND WORK MACHINE EQUIPPED WITH JACK DEVICE

    ARITA RYUICHI / KISHI TAKURO | European Patent Office | 2024

    Free access

    JACK DEVICE AND WORK MACHINE EQUIPPED WITH JACK DEVICE

    ARITA RYUICHI / KISHI TAKURO | European Patent Office | 2023

    Free access

    JACK DEVICE AND WORK MACHINE EQUIPPED WITH JACK DEVICE

    ARITA RYUICHI / KISHI TAKURO | European Patent Office | 2022

    Free access