Multi-stage manual hydraulic pump

Details Multi-stage manual hydraulic pump Multi-stage manual hydraulic pump

2000-03-27

2000-12-12

Moulis, Thomas N.

Pumps

Successive stages

With interstage discharge or additional discharge from...

217244, F04B 300

Patent

active

06158973&

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 variable hydraulic piston and cylinder assembly in each high volume block and each medium 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:
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patent: 3787147 (1974-01-01), McClocklin et al.
patent: 3896620 (1975-07-01), Flory
patent: 3908701 (1975-09-01), Dawawala
patent: 4278574 (1981-07-01), Vehara et al.
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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