Nozzle assembly for dispensing liquid

Details Nozzle assembly for dispensing liquid Nozzle assembly for dispensing liquid

1994-05-24

1995-02-28

Mitchell, David M.

Fluid sprinkling, spraying, and diffusing

With cleaning means, drip collecting, waste disposal or soil...

Nozzle cleaner, flusher or drainer

239499, B05B 1504

Patent

active

053929896

ABSTRACT:
An improved nozzle assembly for dispensing liquid is disclosed. In a first embodiment of the invention, the liquid dispenser comprises a nozzle assembly with an expansive cavity at its dispensing end. When the flow of liquid in the dispenser is halted, a pocket of liquid formed inside the cavity ties the liquid in the nozzle to the liquid in a drop formed at the tip of the nozzle. Thus, when "suck-back" is applied, the drop is pulled into the cavity and up the nozzle, leaving at most a very small and stable amount of liquid inside the cavity. In a second embodiment of the invention, an inner nozzle tube extends beyond the end of an outer nozzle tube, creating an external annular recess which captures and holds a drop of liquid over the end of the nozzle. After suck-back, the drop is pulled up into the nozzle, leaving a small, stable amount of liquid in the annular recess.

REFERENCES:
patent: 2023984 (1935-12-01), Wells
patent: 3315899 (1967-04-01), Quarve
patent: 4932593 (1990-06-01), Kiracofe

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