Hydraulic jack and a hydraulic circuit for such a hydraulic jack
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 15, 2003
Grant Date -
Jun 20, 2002
app pub date -
Dec 19, 2000
filing date -
Dec 19, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A continuously auto lifting and lowering hydraulic jack comprises a base, an oil pump, working oil cylinder, a piston, an oil box, an accumulator, a two-position and two-way valve, a dual-controlling check, a pressure-set check and other checks. The two-position and two-way valve, the dual-controlling check and the pressure-set check are arranged in a straight line; a valve bore is formed in the base to serve as a common valve bore for the two-position and two-way valve, the dual-controlling check and the pressure-set check. Valve members of the two-position and two-way valve, the dual-controlling check and the pressure-set check are disposed sequentially in the valve bore in series; a tappet is positioned between the two-position and two-way valve and the dual-controlling check; and another tappet is positioned between the dual-controlling check and the pressure-set check. Also disclosed is a hydraulic circuit for the hydraulic jack.
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