Fluid pump dispenser for pharmaceutical use

Details Fluid pump dispenser for pharmaceutical use Fluid pump dispenser for pharmaceutical use

1991-02-11

1992-09-15

Bollinger, David H.

Dispensing

With discharge assistant

With movable nozzle interconnected therewith

222341, 222385, 2224005, 2224022, B65D 8854

Patent

active

051470730

ABSTRACT:
The lower end of a first hollow vertical cylinder is connected to the upper end of a second vertical hollow cylinder of smaller diameter. A first outer hollow stem open at its ends has an intermediately disposed first external enlargement disposed below the top open end of the first cylinder. A hollow vertical main piston is vertically slidable within the first cylinder. A second inner stem has an upper vertical section which extends upwardly through the main piston and through a bore in the first stem. A vertical fluid discharge path is formed between the upper section and the first stem. An integral lower vertical section of the second stem engages the lower end of the main piston. A fluid discharge port is formed between the first section and the stem. A vertical inner piston is slidable in the second cylinder. A first spring normally biases the stems together, closing the discharge port. A second spring causes the discharge port to open during a selected point on the downstroke.

REFERENCES:
patent: 4089442 (1978-05-01), Hafele et al.
patent: 4173297 (1979-11-01), Pettersen
patent: 4278189 (1981-07-01), Kirk, Jr.
patent: 4640443 (1987-02-01), Corsette
patent: 4693675 (1987-09-01), Venus, Jr.
patent: 4726747 (1988-02-01), Skorka
patent: 4735347 (1988-04-01), Schultz et al.
patent: 4823991 (1989-04-01), Skorka
patent: 4941595 (1990-07-01), Montaner et al.
patent: 5020696 (1991-06-01), Cater
patent: 5038965 (1991-08-01), Cater

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