Provided is a large-stroke lifting jack. A cover plate and a jointing plate are connected with the upper end and the lower end of a supporting barrel respectively. An inner hole of the supporting barrel, a center hole of the cover plate and a forward rotating threaded hole of the jointing plate are located on the same axis. A driving rod is of a screw pipe structure. An inner hole of the driving rod is arranged to be of a backward rotating threaded hole structure. An upper end head of the driving rod is connected with the forward rotating threaded hole of the jointing plate in a threaded mode. A lower end head of the driving rod is connected with an operating crank. A lifting rod is of a backward rotating stud structure. The stud wall of the lifting rod is provided with a longitudinal limiting groove. The lifting rod is arranged inside the supporting barrel. An upper end head of the lifting rod extends out of the center hole of the cover plate. The limiting groove on the lifting rod is matched with a guiding key on the center hole of the cover plate. The lower end of the lifting rod is connected with a backward rotating threaded hole inside the driving rod. The jointing plate is fixed to a building, the operating crank is rotated, and when the driving rod is raised or descended along with the forward rotating threaded hole of the jointing plate in a threaded mode, the backward rotating threaded hole inside the driving rod can drive the lifting rod to raise or descend along with the direction limited by the guiding key and the limiting groove.
Large-stroke lifting jack
2015-08-26
Patent
Electronic Resource
English
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 |