Manpower hydraulic jack

The utility model discloses a full-hydraulic jack which can jack the weight to the preset height at one time. The utility model is characterized in that an oil cylinder is provided with two piston rods which are sheathed together to form annular chamber bodies. The two cavity bodies are provided wit...

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Bibliographic Details
Main Author XILAN LI
Format Patent
LanguageEnglish
Published 18.02.1998
Edition6
Subjects
HAULING
HOISTING
HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDEDFOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCEDIRECTLY TO THE SURFACE OF A LOAD
LIFTING
PERFORMING OPERATIONS
TRANSPORTING
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Summary:The utility model discloses a full-hydraulic jack which can jack the weight to the preset height at one time. The utility model is characterized in that an oil cylinder is provided with two piston rods which are sheathed together to form annular chamber bodies. The two cavity bodies are provided with inner holes for communication. When a big piston rod is jacked up by hydraulic pressure, oil liquid is gradually squeezed into the cavity body of a small piston rod to enable the small piston rod to be upward climbed by the hydraulic pressure in order to complete the operation of jacking the weight at one time. The utility model has safety and the jacking time is shortened. Compared with the operation of secondary jacking and manual screwing of the prior jack, the utility model has an essential progress.
Bibliography:Application Number: CN1996229224U