| 摘要 |
Disclosed is a jack lever, in which oil is pumped by piston ( 10 ) to move a cylinder ( 20 ) faster, vacuum being created at a lower portion of the cylinder ( 20 ) moving up, oil in an oil tank ( 101 ) being then flowed in the lower portion through an oil suction channel to make the cylinder move up faster. If the cylinder ( 20 ) moves upward to push up a work piece, load is exerted into the cylinder ( 20 ), so making the piston ( 10 ) pumping oil stronger, the oil opening a check ball ( 15 a) mounted on a bypass channel ( 15 ) by the pumping and being supplied to the lower portion of the cylinder ( 20 ) to move the cylinder up. At this time, the cylinder ( 20 ) moves slower but increases ascending force, thus requiring small power to manipulate a jack lever (not shown) pumping the piston ( 10 ).
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