Hydraulic pumping cylinder and method of pumping hydraulic...

Details Hydraulic pumping cylinder and method of pumping hydraulic... Hydraulic pumping cylinder and method of pumping hydraulic...

2008-04-24

2009-12-29

Wilson, Lee D (Department: 3727)

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

C254S024000, C254S00200C, C254S00800R, C060S479000

Reexamination Certificate

active

07637479

ABSTRACT:
A hydraulic jack including a frame and a pump connected to the frame. The pump includes a rod, a housing, a piston and a plurality of valves. The rod has a cross-sectional area. The housing has an end through which the rod slides. The piston is associated with said rod, with the piston establishing a rod side chamber and a piston side chamber within the housing. The piston having a cross-sectional area. The plurality of valves each are fluidly connected to the rod side chamber and/or the piston side chamber. The piston, the rod and the valves are arranged to provide a first hydraulic fluid flow associated with the cross-sectional area of the piston until a predetermined pressure is reached and a second hydraulic fluid flow associated with the cross-sectional area of the rod after the predetermined pressure is reached.

REFERENCES:
patent: 4560152 (1985-12-01), Miller
patent: 5755099 (1998-05-01), Hung
patent: 6113086 (2000-09-01), Yonezawa
patent: 6247307 (2001-06-01), Hung
patent: 6450481 (2002-09-01), Oxtoby
patent: 6572080 (2003-06-01), Delikatzis
patent: 6622485 (2003-09-01), Hung
patent: 6742334 (2004-06-01), Fan
patent: 7040091 (2006-05-01), Fan
patent: 2004/0065871 (2004-04-01), Hsu
patent: 2007/0022750 (2007-02-01), Bitter

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