| 摘要 |
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.
|
