Pump device

Details Pump device Pump device

1985-05-01

1985-12-17

Husar, Cornelius J.

Pumps

Successive stages

With interstage intake or additional inlet to latter stage

417350, F04B 3504

Patent

active

045589925

ABSTRACT:
An air pump device comprises an electric motor, a low and a high pressure type pump disposed at both ends of a rotary shaft extending from the motor to be connected in series to each other through a discharge tube from the low pressure type pump extending to a suction port of the high pressure type pump, and an air suction tube connected via a valve to the discharge tube downstream of a change-over switch disposed in the discharge tube.

REFERENCES:
patent: 2530682 (1950-11-01), Coldsnow
patent: 2814254 (1957-11-01), Litzenberg
patent: 2891717 (1959-06-01), Huitson
patent: 3094272 (1963-06-01), McClure
patent: 3116872 (1964-01-01), Buechel et al.
patent: 4077748 (1978-03-01), Potz
patent: 4229142 (1980-10-01), Le Dall et al.
patent: 4232521 (1980-11-01), Mallofre

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