Pumps – Motor driven – Fluid motor
Patent
1975-10-23
1977-02-22
Freeh, William L.
Pumps
Motor driven
Fluid motor
417395, F04B 4306, F04B 4500, F04B 1700, F04B 3500
Patent
active
040089843
ABSTRACT:
Flexible diaphragms mounted on the ends of a shaft contact a liquid to be dispensed (e.g., syrup bases). A chamber is located about the shaft side of each diaphragm, which chamber is in communication via shaft passages with outlets in the shaft wall. A valving member is slidingly received on the shaft and interconnected with a source of pressurized gas by a flexible hose. The valving members transfers from a position where one opening is in communication with the pressurized gas and the other opening is exposed, to a second position where the relationship of the shaft openings to the valving member is reversed. A pair of opposed coil openings urge the valving member past the longitudinal shaft center to reverse direction after the coils are sufficiently loaded, which results when the valving member is at the end of either shaft stroke.
REFERENCES:
patent: 2798440 (1957-07-01), Hall
patent: 3329094 (1967-07-01), Harklau et al.
patent: 3652187 (1972-03-01), Leeffler et al.
Freeh William L.
LaPointe G. P.
Netter George J.
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