Air filter for internal combustion engines

Claim 1

AN AIR FILTER FOR CARBURETORS OF INTERNAL COMBUSTION ENGINES COMPRISING IN COMBINATION: A SUBSTANTIALLY CYLINDRICAL CASING A INCLUDING A SIDEWALL 1, A BOTTOM WALL 2 OF TRUNCATED CONICAL SHAPE, AND A REMOVABLE COVER B PROVIDING A TOP WALL FOR THE CASING, SAID BOTTOM WALL HAVING A CENTRALLY DISPOSED AIR OUTLET OPENING 3 AND A PLURALITY OF ELONGATED, LOUVERED, AIR INLET OPENINGS 5 TANGENTIALLY DISPOSED RELATIVE TO SAID CENTRAL OPENING 3, SAID LOUVERED AIR INLET OPENINGS 5 ALL BEING ORIENTED IN THE SAME DIRECTION TO IMPART A WHIRLING MOTION TO AIR PASSING THERETHROUGH, A PARTITION C INCLUDING A CONVEX BOTTOM WALL PORTION DISPOSED WITHIN SAID CASING A AND SPACED ABOVE SAID CASING BOTTOM WALL 2 TO PROVIDE A FIRST AIR RECEIVING CHAMBER 10 THEREBETWEEN, SAID PARTITION C PROVIDED WITH A CENTRAL OPENING CONCENTRIC WITH SAID AIR OUTLET OPENING 3 AND A PLURALITY OF ELONGATED LOUVERED OPENINGS 12 IN ITS BOTTOM WALL, SOME OF SAID LAST MENTIONED LOUVERED OPENINGS ORIENTED IN AN OPPOSITE DIRECTION RELATIVE TO THE AIR INLET OPENINGS 5 IN SAID CASING BOTTOM WALL, AND AT LEAST ONE OF SAID LOUVERED OPENINGS IN SAID PARTITION BOTTOM WALL ORIENTED IN THE SAME DIRECTION RELATIVE TO THE AIR INLET OPENINGS 5 IN SAID CASING BOTTOM WALL, A FILTER ELEMENT 13 PROVIDED WITH A CENTRAL OPENING CONCENTRIC WITH THE CENTRAL OPENINGS IN SAID CASING 1 AND PARTITION C, SAID FILTER ELEMENT DISPOSED WITHIN SAID CASING ABOVE AND SPACED FROM SAID PARTITION C TO PROVIDE A SECOND AIR RECEIVING CHAMBER 9 THEREBETWEEN, MEANS 20, 21, 23, 24, 25 AND CONNECTING SAID CASING A AND COVER B TO THE AIR INTAKE OF THE CARBURETOR, A TUBE 27 SECURED AT ONE END TO THE BOTTOM WALL OF SAID PARTITION C ADJACENT AN OPENING THEREIN, AND COMMUNICATING WITH SAID SECOND AIR RECEIVING CHAMBER 9, SAID TUBE EXTENDING THROUGH SAID FIRST CHAMBER 10 AND THROUGH THE BOTTOM WALL 2 OF THE CASING, CONDUIT MEANS 28 CONNECTED AT ONE END TO THE LOWER END OF SAID TUBE 27 AND CONNECTED AT ITS OTHER END TO THE CRANKCASE OF SAID ENGINE, THE VAPORS FROM THE CRANKCASE OF THE ENGINE BEING DRAWN THROUGH SAID CONDUIT MEANS AND SAID FIRST MENTIONED TUBE 27 INTO SAID SECOND CHAMBER 9 TO MOISTEN SAID FILTER AND IMPREGNATE DUST PARTICLES ENTRAINED IN THE AIR BEING FILTERED IN SAID SECOND CHAMBER, WHEREBY ASPIRATED THROUGH THE LOVERED AID INLET OPENINGS 5 IN SAID BOTTOM WALL IS SUBMITTED TO A WHIRLING CENTRIFUGAL MOVEMENT IN ONE DIRECTION IN THE FIRST CHAMBER 10, THEN PASSES UPWARDLY THROUGH THE LOUVERED OPENINGS 12 IN SAID PARTITION C INTO SAID SECOND CHAMBER 9 AND FLOWS IN A REVERSE CENTRIFUGAL DIRECTION, THROUGH THE FILTER ELEMENT 13 AND INTO THE AIR INTAKE OF THE CARBURETOR.