Dispensing – With discharge assistant – With discharge volume varying means
Patent
1976-01-07
1977-09-06
Reeves, Robert B.
Dispensing
With discharge assistant
With discharge volume varying means
222379, 222380, G01F 1106
Patent
active
040462919
ABSTRACT:
A pipetting device which is readily adaptable to serve as a pipetting/diluting device. In accordance with the invention there is provided a tubular body having front and rear ends, the body having a central bore which narrows at the front end thereof to form a tip. A hollow enclosure is provided and defines a back chamber. A plunger is slideable in the bore and extends from the rear thereof for manual activation. The plunger has a front portion which conforms circumferentially to the inner surface of the body, the bore space in the body forward of the plunger defining a front chamber. The plunger has a communicating passage between the back and front chambers. A first one way valve means restricts flow in the communicating passage to occur only from the back chamber toward the front chamber. Finally, a second one way valve means restricts flow as between the front chamber and the tip to occur only from the front chamber toward the tip. In operation, the downward stroke of the plunger forces liquid in the front chamber through the second one way valve means and the liquid is delivered through the tip. When the plunger returns during the upstroke, a vacuum tends to be created in the front chamber since the second one way valve means restricts air from flowing through the tip and into the front chamber. This causes liquid to flow from the back chamber, through the first communicating passage and the first one way valve means into the front chamber, so the front chamber fills as the plunger returns to the top of its stroke. In one embodiment of the invention an auxiliary plunger is mounted on the front end of the plunger and extends into the tip.
REFERENCES:
patent: 1367008 (1921-02-01), Bessesen
patent: 1563627 (1925-12-01), Hein
patent: 1600587 (1926-09-01), Hein
patent: 2550335 (1951-04-01), Dailey
patent: 2643655 (1953-06-01), McKay
Novack Martin
Reeves Robert B.
Scherbel David A.
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