Pump assembly for hand fork-lift truck

Details Pump assembly for hand fork-lift truck Pump assembly for hand fork-lift truck

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

07401467

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

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