Patent ID: 6446840
Filing Date: 2002-09-10
Classification: B05B

Abstract:
An apparatus for making and dispensing foam, the apparatus comprising:a housing forming a generally closed foaming chamber; a conduit forming a continuously open passage having an inner end opening into the foaming chamber and an outer end open to outside, the conduit being closed except at its ends; a liquid supply; means connected to the supply and including a liquid pump having a small-diameter liquid chamber and a small-diameter liquid supply displaceable therein for drawing liquid from the supply and spraying the liquid into the foaming chamber; means including an air pump having a large-diameter air chamber, an intake connected solely to the foaming chamber to draw air solely therefrom, and a large-diameter air piston displaceable therein between respective end positions and connected directly to the liquid piston for forcing air into the foaming chamber, the conduit, the air piston, and the air chamber being of such dimensions that displacement of the air piston between its end positions moves a volume of air greater than a volume of air held in the conduit between its ends; and means in the foaming chamber for mixing the spray and air therein to generate foam and expand the foam to flow through the conduit out the outer end thereof.