Plural component airless spray gun with mechanical purge

Details Plural component airless spray gun with mechanical purge Plural component airless spray gun with mechanical purge

1996-08-20

1998-11-03

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

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

Nozzle cleaner, flusher or drainer

239414, 239427, 92 52, B05B 1502

Patent

active

058296794

ABSTRACT:
A plural component airless spray gun for reactive liquid materials has a mix chamber into which coreactive liquid components are introduced and mixed, an airless tip at a forward outlet from the chamber from which the mixed components are emitted in a fan-shaped spray, and a mechanically operated purge rod for cleaning residual reactants from the mix chamber and airless tip. The purge rod has a main body of a diameter slightly less than that of the mix chamber and a probe at its forward end that geometrically conforms to and is adapted to enter into and clean the inside of the spray tip. During spraying the purge rod is retracted in the mix chamber rearwardly of liquid reactant inlets to the chamber. Upon completion of spraying or periodically as desired, the purge rod is moved forwardly to clean the mix chamber and the inside of the airless tip of residual reactive components. To prevent damage to the airless tip should the probe of the purge rod encounter cured material within the tip or the tip itself as the purge rod is moved forward, the purge rod is moved forward by a piston assembly that is structured to decrease the forward driving force exerted on the purge rod when its probe is in the airless tip.

REFERENCES:
patent: 3366337 (1968-01-01), Brooks et al.
patent: 4133483 (1979-01-01), Henderson
patent: 4377256 (1983-03-01), Commette et al.
patent: 4471887 (1984-09-01), Decker
patent: 4867346 (1989-09-01), Faye et al.
patent: 5090814 (1992-02-01), Petcen
patent: 5104006 (1992-04-01), Brown
patent: 5299740 (1994-04-01), Bert

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