Patent ID: 8348105

Claim:
A liquid foam dispenser comprising: a liquid source in fluid communication with a nozzle defining an outlet; a first pump adapted to propel liquid from the source to the nozzle; a second pump for propelling air to the nozzle; a single motor in drive engagement with both the first pump and second pump to simultaneously drive liquid and air to the nozzle when the motor is activated; and a mixing chamber positioned between the outlet and liquid source, the mixing chamber defining a liquid inlet, air inlet and a plurality of channels that initiate pressurization of flowing air and counter-mixing of liquid and flowing air therein producing a liquid-air mixture, wherein the plurality of channels comprises an outer annulus with a proximal end in communication with the air inlet and a distal end, and an inner annulus with a proximal end and a distal end, the inner annulus being connected with the liquid inlet through an inner channel, the outer annulus and inner annulus being connected at their respective distal ends via a generally circular conduit.