Foam generating apparatus

Claim 1

A FOAM GENERATING APPARATUS FOR PRE-EXPANDING MATERIALS, COMPRISING A COMBINATION: (A) A MIXING CHAMBER INCLUDING A NOZZLE PORTION AT ONE END OF SAID CHAMBER; (B) MEANS FOR INDIVIDUALLY INTRODUCING MATERIALS INTO SAID CHAMBER SIMULTANEOUSLY, ONE OF SAID MATERIALS BEING IN LIQUID FORM AND ADAPTED TO EXPAND INTO A GAS AT ROOM TEMPERATURE WHEN THE PRESSURE EXECTED ON SAID MATERIALS DROPS BELOW A GIVEN PRESSURE; (C) A PRESSURE BIASED OUTLET VALVE AT ONE END OF SAID CHAMBER ADAPTED TO OPEN TO PASS SAID MATERIAL INTO SAID NOZZLE PORTION ONLY WHEN THE PRESSURE EXERTED ON SAID MATERIALS IN SAID CHAMBER EXCEEDS SAID GIVEN PRESSURE; (D) A ROTATABLE SHAFT ENTERING THE OPPOSITE END OF SAID CHAMBER; (E) AGITATOR MEANS CARRIED BY SAID SHAFT TO MIX TOGETHER SAID MATERIALS; (F) A SOURCE OF FLUSHING MATERIAL ADJACENT TO THE OPPOSITE END OF SAID CHAMBER EXTERIOR OF SAID CHAMBER; AND (G) SEALING MEANS FOR SAID SHAFT AT SAID OPPOSITE END, SAID SEALING MEANS BLOCKING THE FLOW OF SAID MATERIALS FROM PASSING OUT OF SAID CHAMBER THROUGH SAID OPPOSITE END AND PERMITTING FLOW OF SAID FLUSHING MATERIAL THROUGH SAID OPPOSITE END ABOUT SAID SHAFT INTO SAID CHAMBER SUCH THAT SAID SEALING MEANS FUNCTIONS AS A CHECK VALVE FOR INTRODUCING SAID FLUSHING MATERIAL.