Edge-sealing arrangement for air filter apparatus

Claim 1

AIR CLEANING APPARATUS COMPRISING: A HOUSING HAVING AN AIR CLEANING WEB SHEET MATERIAL SUPPLY SECTION AT ONE END THEREOF; A WEB TAKE-UP SECTION AT THE OPPOSITE END OF SAID HOUSING; AND A FLOW-THROUGH GAS TREATING SECTION INTERMEDIATE SAID SUPPLY AND TAKE-UP SECTION AN DEFINING A GAS FLOW PASSAGE THERETHROUGH, SAID GAS TREATING SECTION INCLUDING A PAIR OF CHANNEL-SHAPED FLANGE MEMBERS, EACH OF SAID FLANGE MEMBERS HAVING A BASE LEG AND SPACED UPSTREAM AND DOWNSTREAM SIDE LEGS EXTENDING INTEGRAL WITH AND GENERALLY NORMAL TO SAID BASE LEG; SAID FLANGE MEMBERS BEING POSITIONED IN SPACED RELATIONSHIP ALONG AND DEFINING OPPOSITE LONGITUDINAL EDGES OF SAID PASSAGE, SAID FLANGE MEMBERS EXTENDING FROM THE SUPPLY SECTION TO THE TAKE-UP SECTION WITH SAID LEGS THEREOF BEING INWARDLY DIRECTED TOWARD SAID PASSAGE TO ENGAGE IN LAPPING RELATION WITH THE OPPOSED LONGITUDINAL MARGINS OF SAID WEB TO PREVENT FLOW OF UNCLEAN AIR THEREAROUND; AND A PLURALITY OF SPACED APERTURES EXTENDING LONGITUDINALLY FROM SAID SUPPLY SECTION TO SAID TAKE-UP SECTION ALONG EACH OF SAID UPSTREAM SIDE LEGS OF SAID CHANNEL-SHAPED FLANGE MEMBERS INTERMEDIATE THE RESPECTIVE EDGE PORTIONS THEREOF AND