Implements or apparatus for applying pushing or pulling force – Multiple lifters
Patent
1979-01-29
1980-11-25
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Multiple lifters
B66F 324
Patent
active
042355427
ABSTRACT:
In a self stowing vehicle leveling hydraulic jack, a cylindrical ram housing is pivotably affixed to the vehicle to be leveled. A cylindrical hydraulically actuated ram is carried within the cylindrical ram housing in a telescoping manner. An electrical motor is contained within the ram. The motor drives a hydraulic pump, also contained in the ram. The output of the pump passes through a control valve for selectively valving the hydraulic fluid between a ram extension chamber and a ram retracting chamber for selectively extending or retracting the telescoping ram. A cam follower, carried from the ram, follows a cam track eccentrically mounted relative to the pivotable axis of the ram housing for pivoting the retracted telescoping jack into a self stowing position. A valve traps the hydraulic fluid in the retracting chamber for holding the retracted jack in the self stowed position.
REFERENCES:
patent: 1823286 (1931-09-01), Phillips
patent: 1988304 (1935-01-01), Duman
patent: 2442881 (1948-06-01), Soskin
patent: 2837312 (1958-06-01), Troche
patent: 2882070 (1959-04-01), Bill
patent: 3362683 (1968-01-01), Hansen
patent: 3749363 (1973-07-01), Hauser
patent: 3817493 (1974-06-01), Hansen
patent: 3909040 (1975-09-01), Visser
Aine Harry E.
Lowhurst Harvey G.
Watson Robert C.
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