Pumps – Motor driven – Fluid motor
Patent
1990-09-11
1992-01-28
Bertsch, Richard A.
Pumps
Motor driven
Fluid motor
417392, 91346, F04B 4306
Patent
active
050839063
ABSTRACT:
This invention relates to an improved gas-driven pump for pumping products, such as beverage syrups. A piston is mounted to a piston shaft for reciprocal movement within a housing. Cavities corresponding to the piston are alternately vented and pressurized to intake the product into a first chamber and to drive the piston to pump the product. A valve stem is included within the housing and is adapted such that the piston performing intake and exhaust strokes moves the valve stem between intake and exhaust positions. A valve body is disposed about the valve stem which is also movable between two positions for alternately venting and pressurizing a second chamber. The valve stem which is operable to move the valve body is biased toward the intake or exhaust position by an overcenter spring disposed within the second chamber.
REFERENCES:
patent: 3268271 (1966-08-01), Yackle
patent: 3699846 (1972-10-01), Stomper
patent: 4551076 (1985-11-01), DuBois
patent: 4681518 (1987-07-01), Credle, Jr.
patent: 4828465 (1989-05-01), Credle, Jr.
patent: 4923168 (1990-05-01), Murata et al.
patent: 5002469 (1991-03-01), Murata et al.
Bertsch Richard A.
Kocharov Michael I.
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