Cylinder apparatus for hydraulic lift jack with transmission

Details Cylinder apparatus for hydraulic lift jack with transmission Cylinder apparatus for hydraulic lift jack with transmission

2007-12-25

2007-12-25

Wilson, Lee D. (Department: 3723)

Implements or apparatus for applying pushing or pulling force

Single throw lever

Lazy tongs

C254S126000

Reexamination Certificate

active

11259360

ABSTRACT:
A cylinder apparatus is provided for a hydraulic lift jack with a transmission device so that the ascending velocity is high with no load and the ascending velocity is low when there is a load. The cylinder apparatus includes a lifting mechanism for moving an upper plate up and down by the hydraulic pressure in the hydraulic cylinders and a fluid pumping mechanism for in-taking the oil stored in the oil tank and pumping the oil to the outside. The cylinder apparatus also includes a piston installed to move reciprocally within the main hydraulic cylinder, and a pumping transmission mechanism including a transmission control for controlling the pumping volume of the oil so that the ascending velocity can be controlled progressively. An oil pressure removing portion removes the pressure of the piston so that the pumping mechanism then can supply a little volume of oil.

REFERENCES:
patent: 4447041 (1984-05-01), Fujita
patent: 5375681 (1994-12-01), Eickmann
patent: 6974123 (2005-12-01), Latvys
patent: 2007/0051932 (2007-03-01), Ha

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