Multi-stage hydraulic pump

Details Multi-stage hydraulic pump Multi-stage hydraulic pump

1998-03-26

2000-06-27

Moulis, Thomas N.

Pumps

Successive stages

With interstage discharge or additional discharge from...

417244, F04B 300

Patent

active

060799560

ABSTRACT:
A multi-stage manual hydraulic pump comprising a plurality of cylinders in tandem. A block holds each cylinder assembly. One or more cylinders are the high volume stage, one or more cylinders are the medium volume stage and the final cylinders are the low volume, high pressure stage. The pump utilizes check valves built into flow tubes that control the direction of fluid. A spring and piston in each high volume block automatically turns off the vacuum and flow of fluid to each cylinder at a designated pressure. At the point of highest pressure only the smallest cylinder or cylinders are pumping fluid, where the effort expended is significantly reduced.

REFERENCES:
patent: 3628567 (1971-12-01), Bender et al.
patent: 3747473 (1973-07-01), Bach et al.
patent: 3787147 (1974-01-01), McClocklin et al.
patent: 3896620 (1975-07-01), Flory
patent: 3908701 (1975-09-01), Dawawala
patent: 4287813 (1981-09-01), Chatterjea et al.
patent: 4850828 (1989-07-01), Yonezawa
patent: 5207726 (1993-05-01), Rathweg
patent: 5575627 (1996-11-01), Vairin et al.

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