Dispensing – With discharge assistant – With discharge volume varying means
Patent
1974-08-05
1976-06-15
Knowles, Allen N.
Dispensing
With discharge assistant
With discharge volume varying means
222334, 222340, 222380, 251 9, G01F 1106
Patent
active
039631516
ABSTRACT:
A fluid dispensing system for accurately dispensing precise aliquots of fluid rapidly and efficiently. The system includes a reservoir of fluid and a pump adapted for connection to a reservoir of fluid and for transferring precise aliquots of fluid from the reservoir to an outlet orifice. An inlet tube is provided with a bore therethrough and one open end for fluid communication with a reservoir and the other open end in fluid communication with the pump. An outlet tube is provided having a bore therethrough with one open end forming the outlet orifice for the system and the other open end in fluid communication with the pump. Controls are connected to the pump to precisely regulate the amount of fluid in an aliquot transferred from a reservoir through the inlet tube, pump and outlet tube to the outlet orifice during an operating cycle of the pump. Finally, a valve assembly is in the system associated with the inlet and outlet tubes and the pumps so as to normally close the bores in the tubes and to automatically shift to open the inlet tube while maintaining the closed outlet tube when the pump draws a precise aliquot from a reservoir. The valve assembly automatically closes the bore of the inlet tube while opening the bore of the outlet tube when the pump dispenses the precise aliquot through the outlet orifice.
REFERENCES:
patent: 3381845 (1968-05-01), MacDonald
patent: 3447576 (1969-06-01), Gronlund
patent: 3626999 (1971-12-01), Jones
Becton Dickinson and Company
Knowles Allen N.
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