Dispensing unit for liquid and method of dispensing

Details Dispensing unit for liquid and method of dispensing Dispensing unit for liquid and method of dispensing

1975-11-20

1978-09-12

Reeves, Robert B.

Dispensing

Processes of dispensing

222321, B05B 1102, G01F 1102

Patent

active

041131452

ABSTRACT:
A vented pump and pre-loaded spring for dispensing liquid at a controlled rate from a container upon depression of a plunger or stem. A pump body extends within the container and houses the stem and piston. The lower end of the stem functions as an inlet valve. The piston is slidable on the stem between upper and lower stop limits and seals the outlet passage in the stem when the plunger is in a raised position. An initial downward movement of the plunger closes the inlet valve and then, after a slight build up of pressure within the pump chamber, moves the outlet passage downwardly of the piston into communication with the pump chamber below the piston. Continued downward motion of the stem moves the piston downwardly and expels the liquid through the outlet passage while maintaining a constant seal at the inlet valve. A sealing disc cooperates with the plunger or stem to prevent air from entering the container when the stem is in the raised position and to allow air to enter the container through a fluid vent passage formed between cooperating surfaces of the container, stem, disc and pump body when the stem is moved toward the down position. A variety of types of fluid vent passages are provided, such as, a plurality of rounded knurls on the outside surface of the pump body to assure an open fluid vent passage after the pump body is crimped to the container and provision is also made for use of a flange adaptor, with or without knurls, for non-crimping modes of constructing the pump assembly.

REFERENCES:
patent: 3187960 (1965-06-01), Gorman
patent: 3211346 (1965-10-01), Meshberg
patent: 3228570 (1966-01-01), Steiman
patent: 3331559 (1967-07-01), Fedit
patent: 3452905 (1969-07-01), Micallef

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