Oil pressure device of jack

Details Oil pressure device of jack Oil pressure device of jack

1994-03-07

1995-05-23

Look, Edward K.

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

60481, 417469, F16D 3102, F04B 1902

Patent

active

054170656

ABSTRACT:
An oil pressure device for a jack whereby a hydraulic jack is adapted to raise rapidly until the lifting portion of the jack reaches a load sufficient to overcome a spring operating force, at which point the operation of the jack shifts to a slower, more powerful mode to raise the load.

REFERENCES:
patent: 2250551 (1941-07-01), Pfauser
patent: 2618122 (1952-11-01), Gratzmuller
patent: 2624174 (1953-01-01), Loef
patent: 3806091 (1974-04-01), Wride
patent: 4840548 (1989-06-01), Hammelmann

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