The invention relates to a lifting jack. The lifting jack comprises a substrate, wherein a lifting threaded rod is arranged in the substrate. The lifting jack is characterized in that a first accommodating groove is formed in the substrate; the lifting threaded rod comprises a first threaded rod and a second threaded rod; the first threaded rod is arranged in the first accommodating groove, a second accommodating groove is formed in the first threaded rod along the axis direction of the first threaded rod, and an internal thread matched with the second threaded rod is arranged at the upper part of the second accommodating groove; the second threaded rod is accommodated in the second accommodating groove; a first limiting piece for limiting the lift stroke of the first threaded rod is arranged between the first threaded rod and the substrate, and a second limiting piece for limiting the lifting formation of the second threaded rod is arranged between the second threaded rod and the first threaded rod; the output end of a driving device is in threaded connection with the first threaded rod, and the output end of the driving device is arranged in the substrate in a rotating mode; the tops of the first threaded rod and the second threaded rod are connected with a supporting seat for supporting and lifting objects in a driving mode. According to the lifting jack, the lifting formation of the lifting jack can be doubled under the precondition of unchanging the original dimensions and weight.


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    Title :

    Lifting jack


    Contributors:
    XU XUEFENG (author) / LU TAO (author)

    Publication date :

    2015-06-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    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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