Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1983-01-19
1985-06-18
Schmidt, Frederick R.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
B66F 324
Patent
active
045237433
ABSTRACT:
An automatic pneumatic-hydraulic jack comprises a mini air compressor and automatic hydraulic jack to serve as an on-vehicle tool wherein the power of the battery on the vehicle is used to drive the mini air compressor which compresses air to serve as its primary force. The air enters an entry channel from an air inlet nozzle and passes to an air chamber via a changeover valve to push a small air-oil piston, thus converting air pressure into hydraulic pressure on the other side of the piston which enters into a large hydraulic cylinder via a check valve and pushes a large piston. The downward movement of the small air-oil piston causes engagement with and turns the changeover valve, thus connecting the air chamber channel to an exhaust channel and the entry channel to the storage tank channel which enables the oil storage tank to supply the small hydraulic cylinder with oil under pressure and make the small air-oil piston move upwards when the small hydraulic cylinder is filled with oil, the small air-oil piston turns the changeover valve to connect the air entry channel to the air chamber channel again, thereby completing the cycle. Such reciprocation converts the air pressure into hydraulic pressure to push the big piston which in turn, jacks up the vehicle. To lower the vehicle, an oil return screw is turned to allow the oil to return to the oil storage tank via a return channel.
REFERENCES:
patent: 479356 (1982-07-01), Farrell
patent: 1903887 (1933-04-01), Widener
Hartman Judy J.
Schmidt Frederick R.
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