Hydraulic jack for long-term support
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United States of America Patent
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Dec 18, 2012
Grant Date -
Apr 1, 2010
app pub date -
Dec 11, 2008
filing date -
Sep 28, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention discloses a hydraulic jack for long-term support. The hydraulic jack for long-term support includes a base, a housing, an oil cylinder, a piston rod, a top cap, a pump body, a pump core, a handle, a press handle, an oil return valve, a press cap and a slit nut. The slit nut surrounds the piston rod and engages with the piston rod via screw threads. The press cap is disposed on upper ends of the slit nut and the top cap and surrounds the piston rod. The present invention can achieve safe and reliable lifting operation.
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