Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1986-01-14
1986-11-25
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
254134, B66F 324
Patent
active
046244476
ABSTRACT:
A variable and high lift jack powered by a hydraulic cylinder for lifting heavy work objects from close to the ground to high levels away from the ground, initial engagement being optionally low, intermediate and high; an adjustable, variable, low and high lift jack involving three basic adjustments, specifically: (1) a collar/platform on a vertical post, the latter carrying a hydraulic cylinder, (2) a slideable vertical sleeve on the same post vertically adjustable with respect to the top of the piston rod of the hydraulic cylinder by a chain carried between supports of the sleeve over the rod and (3) the variable vertical extendability and retractability of the piston rod of the hydraulic cylinder, the combination of these adjustments giving extraordinary versatility with respect to low to high adjustment of the work engaging beam of the lift device; a lift device of great power and versatility with a range, for example, from 6 to 44 inches in lift while maintaining the greatest safety of operation over the entire range of lift options.
REFERENCES:
patent: 1505443 (1924-08-01), Stone
patent: 2010679 (1935-08-01), Rosenberry et al.
patent: 2476838 (1949-07-01), Coffing
patent: 4066243 (1978-01-01), Johnson
Scofield Thomas M.
Watson Robert C.
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