Dispensing – Drop formers
Patent
1974-11-25
1976-11-30
Knowles, Allen N.
Dispensing
Drop formers
250338, 250573, 734254P, B67D 4718
Patent
active
039944239
ABSTRACT:
An apparatus for the dropwise dispensing of a liquid stored in a reagent bottle or other container, including a tubular probe of inverted J-shaped configuration which communicates with the liquid in the bottle and which is provided with a drop forming and dispensing tip. Gas admitted under pressure to the bottle displaces liquid which passes through the probe until a drop is released at the tip. As the drop falls, it interrupts the light beam of an electro-optic control assembly which in turn actuates a valve to vent the bottle and prevent further liquid discharge from the probe. Because of the configuration and dimensions of the probe, and because of the structural and functional relationship of the probe with other components of the system, the liquid automatically retracts a substantial distance from the probe's free end when such venting occurs, thereby insuring that the tip will remain open and unobstructed for subsequent operation of the apparatus.
REFERENCES:
patent: 1993001 (1935-03-01), Geyer
patent: 2784882 (1957-03-01), DuBois
patent: 2880764 (1959-04-01), Pelavin
patent: 2921715 (1960-01-01), Asset et al.
patent: 3243595 (1966-03-01), Allington
patent: 3283727 (1966-11-01), Rodriques, Jr.
patent: 3572558 (1971-03-01), Hooker
patent: 3771366 (1973-11-01), Thulin
American Hospital Supply Corporation
Knowles Allen N.
Stack, Jr. Norman L.
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