Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1984-05-15
1985-07-02
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
B66F 322
Patent
active
045263450
ABSTRACT:
A double lift jack employs a first hydraulic jack having a long, high-speed lift to elevate a platant into an operating position and a second hydraulic jack mounted on the platant having a short, low-speed lift. The two jacks and the platant are mounted in a sturdy, open-topped housing. The long-lift jack is employed to rapidly elevate the platant and the short-lift jack into their operating positions. The platant is thereupon affixed to the housing in the extended position using studs which are passed through a lip on the housing as the platant is elevated. A load base is raised and lowered by operation of the short-lift jack. The load base is stabilized by hardened guide rods which pass through guide holes in the platant. The thus-locked platant provides a stable base and precise guidance for positioning of a load mounted on the load base. When the studs are released, and the long-lift jack is retracted, the load base is rapidly cleared from interference with a load. A hydraulic control system for the two jacks requires that the long-lift jack receive pressurized hydraulic fluid before permitting actuation of the short-lift jack in order to ensure that the platant is urged into its secured position in contact with the lip of the housing whenever the load base is raised or lowered.
REFERENCES:
patent: 3048237 (1962-08-01), Rutherford
patent: 3365026 (1968-01-01), Mancini
patent: 4447042 (1984-05-01), Masui
Cahill Robert A.
General Electric Company
Watson Robert C.
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