System for producing a continuous supply of air generated foam

Claim 1

IN A SYSTEM FOR PRODUCING A CONTINUOUS SUPPLY OF FOAM OF CONSTANT QUALITY, A FIRST CONDUIT CONNECTED TO A SOURCE OF FOAM LIQUID CONCENTRATE AND TO A CONCENTRATE TANK, A SECOND CONDUIT CONNECTED TO A SOURCE OF WATER AND TO A WATER TANK, A MIXING CHAMBER CONNECTED TO THE CONCENTRATE TANK AND TO THE WATER TANK, A FIRST POSITIVE DISPLACEMENT PUMP TO PUMP CONCENTRATE FROM THE SOURCE TO THE CONCENTRATE TANK, A SECOND PUMP TO PUMP CONCENTRATE FROM THE CONCENTRATE TANK TO SAID MIXING CHAMBER, SAID FIRST PUMP HAVING A GREATER CAPACITY THAN SAID SECOND PUMP, A THIRD PUMP TO PUMP WATER FROM SAID WATER TANK TO SAID MIXING CHAMBER, THE THROUGH-PUT OF SAID THIRD PUMP BEING GREATER THAN THAT OF SAID SECOND PUMP, A SOLUTION TANK CONNECTED TO SAID MIXING CHAMBER, SAID SECOND AND THIRD PUMPS PUMPING SOLUTION FROM SAID MIXING CHAMBER TO SAID SOLUTION TANK, A FOAM DISCHARGE GUN, AN AIR LINE FROM A SOURCE OF COMPRESSED AIR TO SAID GUN, A THIRD CONDUIT FROM SAID SOLUTION TANK TO SAID GUN, A FOURTH PRESSURE PUMP TO PUMP SOLUTION FROM SAID SOLUTION TANK THROUGH SAID THIRD CONDUIT TO SAID GUN, AND MEANS AT SAID GUN FOR MIXING SAID SOLUTION AND SAID AIR TO MAKE SAID FOAM, SAID LAST MENTIONED MEANS INCLUDING AN ORIFICE THROUGH WHICH SAID SOLUTION PASSES INTO CONTACT WITH THE AIR AND MEANS TO MAINTAIN A CONSTANT PRESSURE OF SOLUTION AGAINST SAID ORIFICE.