Power plants – Pressure fluid source and motor – Ram driven by fluid pumped from reservoir
Reexamination Certificate
2008-07-22
2008-07-22
Lazo, Thomas E. (Department: 3745)
Power plants
Pressure fluid source and motor
Ram driven by fluid pumped from reservoir
C060S482000
Reexamination Certificate
active
10935878
ABSTRACT:
Pump assembly for the lift cylinder of a hand fork-lift truck includes a piston pump activated by a bar of a hand fork-lift truck and has a piston chamber and an annulus collector. A three stage control valve connects the lift cylinder with a tank in the lowered setting and connects the piston chamber with the tank in a neutral setting and in a pump setting, connects the piston chamber with the lift cylinder through a first check-valve, with the tank through a second check-valve, a third check-valve between the piston chamber and the annulus collector open to the piston chamber, and a reversing valve between the piston chamber and the annulus collector.
REFERENCES:
patent: 4223901 (1980-09-01), Klemick
patent: 4589669 (1986-05-01), Kedem
patent: 6035635 (2000-03-01), Hung
patent: 6247307 (2001-06-01), Hung
patent: 3602510 (1989-03-01), None
patent: 41 36 820 (1993-04-01), None
Gerbier Stéphane
Maenken Frank
Magens Ernst-Peter
Nissen Nis-Georg
von Werder Martin
Jungheinrich Aktiengesellschaft
Lazo Thomas E.
Vidas Arrett & Steinkraus
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