The invention discloses a spiral shear jack comprising a base made by integrally forging a steel channel and a head made by forging a U-shaped member. Left and right lower supports are hinged to the base. The lower ends of the left and right lower supports are provided with positive teeth and reverse teeth, respectively. The lower ends of the left and right lower supports are hinged before meshing with the positive and reverse teeth. The lower portion of the head is hinged to left and right upper supports. The upper ends of the left and right upper supports are hinged and mesh with the positive and reverse teeth. A wire thread insert is hinged between the left upper support and the left lower support. A special-shaped support shaft is hinged between the right upper support and the right lower support. A fixing sleeve is riveted to the outside of the special-shaped support shaft. The spiral shear jack is reasonable in structural design, convenient to operate and high in universality; the parts have no contact during moving.


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    Title :

    Spiral shear jack


    Contributors:

    Publication date :

    2015-09-02


    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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