Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1998-12-15
2000-03-28
Scherbel, David A.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
B66F 324
Patent
active
060420855
ABSTRACT:
A jack includes a base member having a first chamber in which a piston is received, a main cylinder connected to base member and having a tube extending therein to which the lifting piston is movably mounted, a casing mounted to the main cylinder so as to define a second chamber between the casing and the main cylinder. A first path connects the second chamber and the first chamber and a second path connects the first chamber and the tube so that fluid enters into the tube to extend the lifting piston by operating the piston. A protection path extends between the outside of the base member and the second path with a first branch path and a second branch path respectively extending from the protection path and connecting the second chamber and the interior of the main cylinder. The pressure in the tube can be released by unscrewing the bolt threadedly engaged with the protection path so as to let the fluid enter into the second chamber and the interior of the main cylinder.
REFERENCES:
patent: 1610499 (1926-12-01), Dybens
patent: 2809494 (1957-10-01), Matson
patent: 3822966 (1974-07-01), McClocklin
patent: 5524868 (1996-06-01), Decker et al.
Scherbel David A.
Shanley Daniel G.
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