Bag-type air filter

Claim 1

A HIGH-FREQUENCY, BAG-TYPE AIR FILTER COMPRISING, A CHANNEL-SHAPED RECTANGULAR FRAME HAVING THE CHANNEL FACING INWARDLY THEREOF, A PLURALITY OF OPEN-MOUTH BAGS WHOSE PERIPHERIES AT THE OPEN MOUTH ARE DISPOSED IN A PLANE GENERALLY COINCIDING WITH THE PLANE OF THE UPSTREAM SIDE OF SAID FRAME, EACH OF SAID BAGS HAVING A PLURALITY OF POCKET-DEFINING FASTENERS EXTENDING IN SPACED PARALLEL ROWS ALONG THE DIRECTION OF FLOW OF AIR INTO SAID BAG AND JOINING OPPOSITE SIDES OF THE BAG TOGETHER IN ORDER TO SUBDIVIDE THE BAG INTO GENERALLY TUBULAR POCKETS DURING THE FLOW OF AIR UNDER PRESSURE THERETHROUGH, THE UPSTREAM ENDS OF SAID ROW OF FASTENERS TERMINATING SHORT OF THE OPEN MOUTH OF SAID BAG, EACH BAG HAVING THAT PORTION OF ITS OPEN-MOUTH PERIPHERY NEAREST THE ADJACENT BAG JOINED THERETO BY FLEXIBLE BAG-SUPPORTING BINDING STRIP EXTENDING TRANSVERSELY OF THE FRAME, THE REMAINDER OF THE OPEN-MOUTH PORTION OF THE BAG BEING AFFIXED TO THE ADJACENT INTERIOR PORTION OF SID FRAME CHANNEL, A PLURALITY OF RIGID PARALLEL NARROW SUPPORTS EXTENDING TRANSVERSELY OF SAID FRAME AND IN LOOSE CONTACT WITH THE RESPECTIVE BINGING STRIPS ON THE FILTER AIR SIDES THEREOF, THE ENDS OF SAID SUPPORTS BEING CONFINED WITHIN THE CHANNEL OF SAID FRAME AT OPPOSITE SIDES OF SAID FRAME, EACH OF SAID BAGS HAVING A FIRST AND A SECOND FLEXIBLE TENSIONING STRIP ATTACHED THERETO AND EXTENDING TRANSVERSELY OF THE BAG ON THE RESPECTIVE FILTERED AIR SIDES OF THE BAG AND LOCATED DOWNSTREAM FROM SAID SUPPORTS AND AT THE UPSTREAM ENDS OF SAID ROWS OF FASTENERS THEREBY TO FORM A MANIFOLD SPACE FOR SUCH BAG BETWEEN ITS BINDING AND TENSIONING STRIPS AND WITH WHICH SPACE THE INTAKE ENDS OF THE BAG POCKETS COMMUNICATE AND WITHOUT REQUIRING SPACED MEANS OTHER THAN SAID NARROW SUPPORTS, SAID FLEXIBLE TENSIONING STRIPS FOR EACH BAG UPON PASSAGE OF AIR UNDER PRESSURE INTO THE BAG SERVING JOINTLY TO ADOPT A GENERALLY CIRCULAR SHAPE BETWEEN ADJACENT ROWS OF FASTENERS OF THE BAG AND TO DEFINE A NOZZLELIKE ENTRANCE INTO THE POCKETS OF THE BAG.