Hydraulic jack

Details Hydraulic jack Hydraulic jack

1978-03-16

1980-06-10

Hershkovitz, Abraham

Motors: expansible chamber type

Relatively movable working members with one having motive...

One working member forms movable chamber for another

91167R, 91408, 92 52, 92 53, 92165R, 92167, F01B 720

Patent

active

042066840

ABSTRACT:
A hydraulic jack suitable for powering a large load such as an elevator or a drawbridge. In a first embodiment the hydraulic jack telescopes at a uniform rate over its entire distance of extension and includes a plunger member telescopingly enclosed within a sleeve member which, in turn, is telescopingly enclosed within a cylinder member, with the cylinder member encircled by an oil jacket within which the cylinder member is capable of limited angular movement. Means are provided for angularly aligning the various members within one another. Means are also provided to restrict the flow of hydraulic fluid as the hydraulic jack reaches a limit of its travel. Hydraulic jacks in accordance with the present invention can be coupled together in systems to lift large loads.

REFERENCES:
patent: 2443312 (1948-06-01), Geiger
patent: 2872904 (1959-02-01), Van den Beemt
patent: 3053050 (1962-09-01), Sommerer
patent: 3136221 (1964-06-01), Walker
patent: 3333513 (1967-08-01), Wettstein
patent: 3561331 (1971-02-01), Feucht
patent: 3677141 (1972-07-01), Lagerqvist
patent: 3973468 (1976-08-01), Russell, Jr.

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