Pumps – Motor driven – Electric or magnetic motor
Patent
1975-04-24
1976-09-21
Freeh, William L.
Pumps
Motor driven
Electric or magnetic motor
417470, F04B 1900
Patent
active
039816320
ABSTRACT:
A metering pump for determining the quantity of a fluid flowing at an externally-determined rate, e.g., for measuring the volume of a gas, such as air, flowing through a flow-restrictive element, such as a filter, has a variable-volume chamber (e.g., a bellows) including a movable wall which is urged in one direction (e.g., toward expansion if an inspirator) by resilient means and is driven in the opposite direction by mechanical means, such as a reciprocable lever arm which engages the wall but leaves it during a part of its movement, said means having electrical contacts in a circuit which powers an electrical motor driving the mechanical means, the contacts being open when the mechanical means leaves the wall, permitting the wall to move at a rate determined by the fluid flow rate. Counting means, such as a counter, are coupled to the electric motor or circuit for counting the movements of the wall.
REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 2005504 (1935-06-01), Prautzsch
patent: 2429441 (1947-10-01), Williams
patent: 2488995 (1949-11-01), Thiberg
patent: 3410059 (1968-11-01), Garner
patent: 3411704 (1968-11-01), Hilgert et al.
patent: 3515966 (1970-06-01), De Valroger et al.
Freeh William L.
La Pointe G. P.
Milmore Oswald H.
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