Dust collection apparatus

Claim 1

IN A BAG FILTER FOR REMOVING SUSPENDED DUSTS FROM GASES HAVING AT LEAST ONE VERTICALLY SUSPENDED BAG IN AN ENCLOSURE CHAMBER, A GAS ACTIVATED APPARATUS FOR CLEANING A FILTER BAG BY DISLODGING FILTER SOLIDS FROM THE BAG WALL, SAID APPARATUS INCLUDING A RELATIVELY SHORT TUBULAR ELEMENT HAVING A CROSS SECTION SUBSTANTIALLY CORRESPONDING TO A FILTER BAG CROSS SECTION AND POSITIONED CONCENTRICALLY WITH AND AT ONE END OF SAID BAG, A SLEEVE OF RESILIENT MATERIAL SURROUNDING AND HAVING A PORTION NORMALLY GRIPPING SAID TUBULAR ELEMENT BUT CAPABLE OF VIBRATORY RELEASE, AT THE LOWER END THEREOF, OF GAS UNDER PRESSURE, WHEN GAS IS SUPPLIED BETWEEN THE TUBULAR ELEMENT AND SAID SLEEVE, AND FLEXIBLE, GAS IMPERVIOUS MOUNTING MEANS, SURROUNDING A PART OF THE TUBULAR ELEMENT AND FORMING WITH THE SAID SLEEVE A FAS CHAMBER AROUND THE TUBULAR ELEMENT AND RESILIENTLY CONNECTING THE BAG END TO AN ENCLOSURE CHAMBER WALL, AND A GAS CONDUIT TO SUPPLY GAS TO THE GAS CHAMBER AROUND THE TUBULAR ELEMENT, WHEREBY SUPPLYING GAS THROUGH THE GAS CONDUIT RESULTS IN GENERATION OF GAS WAVE PULSATIONS WHICH ARE TRANSMITTED AT LEAST IN PART TO THE INTERIOR OF THE BAG, AND CORRESPONDING MECHANICAL PULSATIONS WHICH ARE TRANSMITTED DIRECTLY TO THE BAG DURING THE PERIOD OF THE SUPPLY AND RELEASE OF GAS.