Hydraulic jack

Details Hydraulic jack Hydraulic jack

1976-12-27

1977-09-27

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Fluid pressure

Vehicle attached

90 23, 91 43, 91401, 92 30, B66F 324

Patent

active

040506746

ABSTRACT:
A hydraulic jack comprising a cylinder, a piston slidable relative to the cylinder, pump means to supply pressurized fluid to the base of the piston, a seal between the piston and the cylinder, means for limiting the stroke of the piston in the cylinder, said means comprising a ring carried by the piston and arranged to expand into a groove in the cylinder wall when the piston reaches the end of its permitted travel, and means for selectively de-activating said stroke limiting means, in order to allow removal of the piston from the cylinder to renew the seal.

REFERENCES:
patent: 2153845 (1939-04-01), Rosenberry
patent: 2839032 (1958-06-01), Reynolds
patent: 3552273 (1971-01-01), Resuggan

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