Manually operable vacuum pump

Details Manually operable vacuum pump Manually operable vacuum pump

1994-02-17

1996-02-27

Bertsch, Richard A.

Pumps

Processes

417259, 417523, 417545, F04B 5312, F04B 2500

Patent

active

054944104

ABSTRACT:
A manually operable vacuum pump having a housing including first and second pump chambers whose volume is altered by movement of a displaceable piston which is moved by means of a piston rod attached thereto and fed through one of the first and second pump chambers. The first and second pump chambers are configured such that gas which is fed into the vacuum pump is compressed in two steps, primarily in the first pump chamber and secondarily in the second pump chamber to provide a suitable endvacuum. Thereafter, the gas is expelled from the second pump chamber through the second end cap.

REFERENCES:
patent: 660136 (1900-10-01), Welch
patent: 1498471 (1924-06-01), Miller
patent: 1682736 (1928-09-01), Berry
patent: 2006583 (1935-07-01), Dennison
patent: 3282220 (1966-11-01), Inman
patent: 3485180 (1969-12-01), Wickenberg et al.
patent: 3752604 (1973-08-01), Dorn
patent: 3753518 (1973-08-01), Kutik
patent: 4975028 (1990-12-01), Schultz

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