Abstract: A simplified device for use with dilute soapy water in a container, with the device being adapted to mechanically convert the soapy water together with ambient air into a dense lather. The device comprises a manually operable bladder as a pressurized ambient air source and the only moving part. The device further comprises conduits for movement of air and soapy water, a mixing chamber, specifically sized orifice entries into the mixing chamber for predetermined metered entry of the air and soapy water into the mixing chamber, an elongated porous plug for the mixing chamber and various check valves. In operation, a portion of the pressurized air is directed through a first conduit, to provide air, through a specifically sized orifice, into the mixing chamber.

Abstract: A lather generator operable to receive liquid soap and a suitable gas under pressure from separate sources into a mixing chamber in such a manner as to produce a thorough intermixture thereof, and then to pass the mixture through a series of successively larger expansion chambers interconnected by restricted passageways, lather being discharged from the final expansion chamber of the series.