Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1978-12-18
1980-05-13
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
92 5R, B66F 324
Patent
active
042025141
ABSTRACT:
The present invention is an improved jack device which comprises mainly a jack body, a plunger pump, a base seat and an oil passage device. The outer cylinder of the jack body is made of transparent, semi-transparent plastic material or the like, cylindrical in shape with calibration marked on its wall for indicating oil level, has a soft tube nozzle insetting its wall with a soft tube attached thereto and disposed in the enclosed space of the outer cylinder and is communicable with plunger pump, thereby enabling the reading of the oil amount and the use of the device in inclined positions. Further, the cylinder of the jack body and the cylinder of the plunger pump are formed with base portions by direct forging, are cylindrical in shape and inserted into the corresponding holes of the base seat, firmly fixed on the base seat by welding, making both of them oil-leak proof. Besides, the base seat has no oil passage bored in it, so it can be a relatively thin iron plate and its area can be increased at will according to practical necessity without creating any trouble.
REFERENCES:
patent: 2153845 (1939-04-01), Rosenberry
patent: 3499601 (1970-03-01), Laerdal
patent: 3806091 (1974-04-01), Wride
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