Power sweeper air filter and dust collector system

Claim 1

IN A MOBILE SWEEPING MACHINE MOUNTED FOR MOVEMENT OVER A SURFACE, SAID MACHINE BEING THEREBY SUBJECTED TO ACCELERATION FORCES INCIDENTAL TO SUCH MOVEMENT, SAID MACHINE HAVING THEREON AN ENCLOSURE FOR A POWER DRIVEN BRUSH, A DUST COLLECTION CHAMBER MOUNTED ON THE MACHINE AND CONNECTED TO SAID ENCLOSURE, AND SUCTION BLOWER MEANS ON THE MACHINE CONNECTED TO THE CHAMBER FOR MOVING THROUGH THE CHAMBER THE DUST LADEN AIR ORIGINATING IN SAID ENCLOSURE, THE CHAMBER BEING CONNECTED IN CIRCUIT IN SAID SUCTION BLOWER SO THAT THE DUST LADEN AIR MOVES GENERALLY UPWARDLY THERETHROUGH, THE IMPROVEMENT COMPRISING A FILTER ACROSS THE CHAMBER IN THE PATH OF UPWARD MOVEMENT OF THE DUST LADEN AIR, SAID FILTER BEING COMPOSED OF A PLURALITY OF ADJACENT UPWARDLY OPENING, DOWNWARDLY DEPENDING POCKETS OF FILTER FABRIC SET SIDE BY SIDE IN SPACED RELATION AND CONNECTED TOGETHER AT THEIR UPPER ENDS AND CONNECTED TO THE WALLS OF THE CHAMBER, SAID POCKETS BEING SUPPORTED AT THEIR UPPER ENDS AND HANGING UNRESTRAINED DOWNWARDLY IN THE CHAMBER IN A DIRECTION GENERALLY OPPOSITE TO THE MOVEMENT OF THE DUST LADEN AIR IN THE CHAMBER, AND SEPARATE SPACER MEANS IN EACH OF SAID POCKETS, SAID SPACER MEANS COMPRISING A MEMBER MADE UP OF INTER-LACED FILAMENTS OF MATERIAL FORMING AN OPEN WORK STRUCTURE PROVIDING A PLURALITY OF INDIVIDUAL POINTS OF SUPPORT FOR EACH OF THE FILTER POCKET WALLS WHERE THE FILAMENTS ARE SUPPORTED BY OTHER FILAMENTS, SAID SPACER MEANS BEING OPERABLE TO HOLD THE OPPOSITE SIDE WALLS OF SAID FILTER POCKETS SUBSTANTIALLY IN SPACED APART PLANES, SAID SPACER MEANS BEING FLEXIBLE IN THE PLANE OF THE POCKETS AND TRANSVERSE TO THE PLANE OF THE POCKETS AND PERMITTING AIR FLOW IN THE PLANE OF THE POCKETS AND TRANSVERSE TO THE POCKETS.