Filter framing system

Claim 1

A HIGH EFFICIENCY FILTER CELL OF A LAMINAR FLOW FILTERING SYSTEM AND SUPPORTING AND SEALING MEANS THEREFOR COMPRISING: A FILTER CELL SUPPORTING FRAME DEFINING AT LEAST ONE OPENING OF PREDETERMINED CONFIGURATION RECEIVING A HIGH EFFICIENCY LAMINAR FLOW FILTER CELL OF CORRESPONDING CONFIGURATION, SAID FRAME COMPRISING AN INVERTED U-SHAPED WEB EXTENDING AROUND THE ENTIRE CIRCUMFERENCE OF SAID OPENING AND HAVING DOWNWARDLY EXTENDING LEGS AND A FLANGE ATTACHED TO AND EXTENDING LATERALLY FROM EACH OF SAID LEGS TOWARD THE OTHER LEG AND DEFINING A SHOULDER DISPOSED INTERNALLY OF THE WEB AND HAVING A SURFACE EXTENDING AROUND THE ENTIRE PERIPHERY OF SAID OPENING AND COOPERATING WITH THE FILTER CELL IN SEALING THE JUNCTURE THEREBETWEEN; A LATCHING MEANS FORMING PART OF SAID SUPPORTING FRAME AND HAVING PORTIONS THEREOF EXTENDING TOWARD SAID OPENING AND RELEASABLY SUPPORTING THE CELL IN SAID OPENING AND COOPERATING IN SEALING THE JUNCTURE BETWEEN THE CELL AND THE FRAME SURFACE AND BEING WITHDRAWABLE FOR RELEASING THE CELL FROM SAID OPENING FOR RELEASABLY LATCHNG SAID FILTER CELL TO SAID FRAME, SAID LATCHING MEANS INCLUDING A BOLT HAVING PORTIONS THEREOF WITHIN THE WEB AND TURNABLE RELATIVE THERETO, A NUT THREADEDLY MOUNTED ON THE BOLT AND BEING DISPOSED WITHIN SAID WEB AND SUPPORTED BY SAID SHOULDERS, SAID DOWNWARDLY EXTENDING LEGS BEING SPACED APART AND ENGAGING SAID NUT AND PREVENTING THE ROTATION OF SAID NUT RELATIVE TO THE WEB; AT LEAST ONE PIVOTALLY MOUNTED RETRACTABLE PAWL ON SAID BOLT; MEANS OPERATIVELY ENGAGING SAID PAWL FOR CAUSING SAID PAWL TO PIVOT ABOUT THE AXIS OF THE BOLT TOWARD SAID OPENING TO SUPPORT THE FILTER CELL AND TO WITHDRAW THE PAWL TO PERMIT THE REMOVAL OF SAID CELL; MEANS OPERATIVELY ENGAGING SAID PAWL FOR ADVANCING SAID PAWL TOWARD THE FRAME UPON TURNING THE BOLT RELATIVE TO THE NUT SUCH THAT THE PAWL IS EXTENDED TOWARD SAID OPENING AND SUPPORTS THE FILTER CELL THEREON, SUCH ADVANCE SHIFTING SAID FILTER CELL TOWARD SAID FRAME; STOP MEANS ON SAID SUPPORT FRAME FOR LIMITING THE EXTENT OF ROTATION OF SAID PAWL AND THUS DEFINING THE WITHDRAWN AND EXTENDED POSITION OF THE PAWL; AND GASKET MEANS FOR SEALING THE JUNCTURE BETWEEN THE FRAME AND SAID FILTER CELL UPON ADVANCEMENT OF SAID PAWL TOWARD SAID FRAME, SAID GASKET MEANS ENGAGING THE ENTIRE PERIPHERY OF SAID OPENING AND THE ENTIRE PERIPHERY OF SAID FILTER CELL AND SEALING THE JUNCTURE BETWEEN THE FRAME AND FILTER CELL.