Heavy equipment jack

Details Heavy equipment jack Heavy equipment jack

1993-12-03

1995-04-18

Look, Edward K.

Expansible chamber devices

Mutually relatively movable cylinder or sleeve, member...

Cylinder or sleeve forms working member

92 53, 92167, F01B 720, F16J 1518

Patent

active

054068800

ABSTRACT:
A double acting hydraulic jack comprising a housing from which at least two pistons extend, each of the pistons being telescopic with respect to one another and with respect to the housing, and a counterbalance valve between adjacent pistons. The counterbalance valve allows hydraulic fluid to flow from an outer piston to an inner piston during piston extension and prevents back flow of hydraulic fluid, thus eliminating piston retraction during extension under load.

REFERENCES:
patent: 3483798 (1969-12-01), Parrett et al.
patent: 4726281 (1988-02-01), De Filippi

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