Jack with drain valve

Details Jack with drain valve Jack with drain valve

1987-08-31

1988-10-25

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Fluid pressure

Vehicle attached

91 49, 91401, B66F 324

Patent

active

047798432

ABSTRACT:
A jack with drain valve including a housing having a first cylinder and a first piston; the first piston defining a second cylinder into which a second piston is reciprocally mounted. A drainage tube is defined by the first piston, the drainage tube extending between the second cylinder and the bottom, workpiece engaging surface of the piston. When both first and second piston engage a workpiece, hydraulic fluid may be forced through an inlet port into the first cylinder, placing pressure against both first and second pistons in their engagement with the workpiece; the drainage tube being obstructed by the second piston. Once the workpiece is moved or the jack retracted, pressure on the hydraulic fluid in the first cylinder, which may be applied by upward pressure on the first piston, forces the second piston downwardly beyond the inlet port of the drainage tube. In this manner the cylinders may be readily drained for reuse of the jack.

REFERENCES:
patent: 3028096 (1962-04-01), Beggs
patent: 3099940 (1963-08-01), Leduc
patent: 4240620 (1980-12-01), Tunkers

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