Three-shift lifting mechanism for jack or the like

Details Three-shift lifting mechanism for jack or the like Three-shift lifting mechanism for jack or the like

2005-08-02

2005-08-02

Watson, Robert C. (Department: 3723)

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

C254S0930VA, C254S0930HP

Reexamination Certificate

active

06923431

ABSTRACT:
A three-shift lifting mechanism includes a hydraulic device disposed at the front side of a valve block and adapted to lift a lifting tube to raise weights, the hydraulic device defining an oil accumulation chamber, a rapid-lifting oil chamber for rapid lifting of the lifting tube to the lifting position, and a high-pressure oil chamber for lifting the lifting tube to raise weights, a piston pump disposed at the back side of the valve block and defining a front working chamber and a rear buffer chamber, and oil passages so arranged that hydraulic oil can be supplied from the oil accumulation chamber and the rear buffer chamber to the front working chamber and then to the rapid-lifting oil chamber or the high-pressure oil chamber to lift the lifting tube.

REFERENCES:
patent: 3806091 (1974-04-01), Wride
patent: 6035635 (2000-03-01), Hung
patent: 6581909 (2003-06-01), Wixey

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