The invention discloses a hydraulic lifting jack, relates to the technical field of lifting jacks and solves the problems that risks are caused to an operator and a heavy object placed in a top bracket under the condition that a top bracket of the hydraulic lifting jack drops rapidly. The hydraulic lifting jack comprises an oil cylinder and an oil tank, wherein an oil outlet of the oil cylinder is connected with an oil inlet in the top of an oil storage barrel by virtue of an oil inlet tube; the oil inlet of the oil tank is connected with an oil outlet in the top of the oil storage barrel by virtue of an oil outlet tube; switching valves for controlling the oil inlet tube to open or the oil outlet tube to open are arranged on the oil inlet tube and the oil outlet tube; a partition plate capable of moving along the barrel wall and a telescopic structure with elasticity are arranged in the oil storage barrel; and the telescopic structure is positioned between the partition plate and the bottom of the oil storage barrel. The hydraulic lifting jack provided by the invention is applied to a scene that the top bracket of the hydraulic lifting jack is required to slowly drop.
Hydraulic lifting jack
2015-12-02
Patent
Elektronische Ressource
Englisch
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 |
Electric hydraulic jack and synchronous lifting control system
Europäisches Patentamt | 2021
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