Anti-clog pump sprayer

Details Anti-clog pump sprayer Anti-clog pump sprayer

1999-08-17

2000-12-12

Kaufman, Joseph A.

Dispensing

With cleaning means

2223211, 222342, B67D 108

Patent

active

061586250

ABSTRACT:
An anti-clog pump sprayer has a cover mounted for independent reciprocation on a plunger head, the cover having a cupped spring biased portion covering the discharge orifice on the head to avoid clogging on product drying, and being lifted off the orifice during the relative shift for uncovering the orifice in readiness for spraying. The sprayer may also have a product retraction device on the plunger head in communication with the discharge orifice, a projection on the underside of the cover top wall for actuating the device at the commencement of the plunger return stroke for creating a slight sub-atmospheric pressure for suctioning any residual product inwardly of the orifice to thereby avoid clogging.

REFERENCES:
patent: 5094364 (1992-03-01), Knickerbocker
patent: 5105988 (1992-04-01), Knickerbocker
patent: 5207785 (1993-05-01), Knickerbocker
patent: 5785208 (1998-07-01), Dobbs et al.

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