Hydraulic lifting apparatus
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United States of America Patent
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Issued Date -
Jun 21, 2007
app pub date -
Dec 15, 2005
filing date -
Dec 15, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a hydraulic jack having two serially connected pneumatic motors for powering a hydraulically activated ram piston in a jacking cylinder. By serially connecting the pneumatic motors, there is a double pump piston stroke, over a predetermined time interval, when compared to a single pump piston stroke with a single motor hydraulic jack. This structure provides the jack with increased jacking speed, when compared to similar jacks with single pneumatic motors.
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