Pumps – Correlated pump and motor or clutch control
Patent
1993-02-25
1994-05-17
Bertsch, Richard A.
Pumps
Correlated pump and motor or clutch control
417319, 417410R, 417415, 417492, 417500, F04B 902, F04B 706
Patent
active
053122330
ABSTRACT:
A rotary/reciprocating liquid dispensing pump for dispensing liquids in the nanoliter range has a narrow radial slot extending longitudinally from an end of a reciprocating, rotating cylindrical piston sliding in a smooth cylindrical bore of a pump housing at a closed end thereof, which slot extends outwardly to the periphery of the piston. The piston is selectively positioned in alignment with one of a plurality of circumferentially spaced small diameter radial passages within the housing opening directly to the cylindrical bore in the path of rotation of said slot. The ports thereof opening to the cylindrical bore are spaced circumferentially a distance in excess of the width of the slot. A linear liquid dispensing pump apparatus including such pump includes a stepping motor and an electromagnetic clutch/braking mechanism concentrically surrounding a lead screw, and the lead screw is threadably engaged with a stepping motor tubular rotor shaft. An anti-backlash assembly operatively couples the stepping motor tubular rotor shaft to the lead screw. The stepping motor is incrementally pulsed and the electromagnetic clutch braking mechanism energized for selective incremental rotation of the lead screw.
REFERENCES:
patent: 970435 (1910-09-01), Dourte
patent: 1713219 (1929-05-01), Eisenhauer
patent: 2643614 (1953-06-01), Rosenkrans
patent: 3022742 (1962-02-01), Bowen
patent: 3168872 (1965-02-01), Pinkerton
patent: 3411703 (1968-11-01), Zengel
patent: 3771918 (1973-11-01), Winter
patent: 4326837 (1982-04-01), Gilson
patent: 5015157 (1991-05-01), Pinkerton et al.
"FMI Lab Pump" Brochure, FMI Fluid Metering, Inc. 1975, Entire Disclosure.
Barney John E.
Bensley Douglas S.
LeBlanc Raymond A.
Tanny Mark N.
Zeitz Vernon W.
Bertsch Richard A.
Ivek Corporation
McAndrews, Jr. Roland G.
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