Unit for filtering dust-laden air

Claim 1

A DUST COLLECTOR UNIT COMPRISING, IN COMBINATION, A CASING PROVIDED WITH A CONTAMINATED AIR INLET AND AT LEAST ONE CLEAN AIR OUTLET SPACED FROM THE INLET FOR THE DISCHARGE THEREFROM OF CLEANED AIR; A FILTER ASSEMBLY INCLUDING A BANK OF FILTER BAGS WHICH ARE PERVIOUS TO AIR AND SUBSTANTIALLY IMPERVIOUS TO DUST AND MOUNTED WITHIN THE SAID CASING TO DIVIDE THE CASING INTO A CONTAMINATED SIDE BETWEEN THE OUTSIDE OF THE BAGS AND THE SAID INLET, AND A CLEAN SIDE BETWEEN THE INTERIOR OF THE BAGS AND THE OUTLET EACH BAG HAVING AN OPEN MOUTH FACING THE SAID CLEAN SIDE AND TWO GENERALLY FLAT AND GENERALLY PARALLEL SIDES, AND BEING ARRANGED SIDE BY SIDE IN CLOSELY SPACED RELATION FOR THE PURPOSE OF COLLECTING FINE DUST ON THE OUTSIDES THEREOF; INSERT MEANS MOUNTED IN SAID FILTER BAG FOR HOLDING APART THE SIDES OF THE BAGS TO KEEP THE LATTER OPEN IN USE AND YET PERMIT OF THE FREE PASSAGE OF AIR THERETHROUGH, EACH OF SAID INSERT MEANS COMPRISING AT LEAST ONE RELATIVELY RIGID SKELETON FRAME SHAPED AND DIMENSIONED TO FIT WITHIN THE CORRESPONDING BAG AGAINST THE INSIDE OF ONE OF SAID GENERALLY FLAT AND GENERALLY PARALLEL SIDES OF THE BAG, AROUND THE PERIPHERY THEREOF, AND A NORMALLY FLAT FLEXIBLE MATTRESS SECURED RIGHT AROUND ITS PERIPHERY TO THE SAID FRAME, THE CENTRAL PORTION OF THE MATTRESS BOUNDED BY THE FRAME BEING LATERALLY DISPLACEABLE FROM FOR THE OPPOSITE SIDES OF A PLANE CONTAINING THE FRAME FOR THE PURPOSE OF BEATING THE SIDES OF THE BAG; AGITATOR ELEMENTS MOUNED AT THE CLEAN SIDE AND EXTENDING INTO EACH OF THE FILTER BAGS THROUGH THE OPEN MOUTHS THEREOF FROM THE CLEAN SIDE AND CONNECTED AT THEIR ENDS TO THE CENTRAL PORTIONS OF THE MATTRESS; AND OSCILLATING MEANS POSITIONED WHOLLY AT THE SAID CLEAN SIDE FOR SO ACTUATING SAID AGITATOR ELEMENTS THAT THEY ARE CAUSED TO ACT DIRECTLY UPON AND TO EFFECT OSCILLATORY DISPLACEMENTS OF THE AFOREMENTIONED CENTRAL PORTIONS OF THE FLEXIBLE MATTRESSES WHICH AS A CONSEQUENCE BEAT THE BAGS FROM THE INSIDES THEREOF.