Cleaning arrangement for bag filters

Claim 1

APPARATUS FOR THE REMOVAL OF DUST FROM A CARRIER GAS COMPRISING A HOUSING HAVING AN INLET FOR DUST ENTRAINED GAS AND AN OUTLET FOR THE EXHAUST OF CLEAN GAS THEREFROM, A DUST HOPPER SUBJACENT SAID HOUSING, A FIRST APERTURED TUBE SHEET INTERMEDIATE THE INLET AND OUTLET PORTS, A SECOND APERTURED TUBE SHEET INTERMEDIATE THE OUTLET PORT AND THE DUST HOPPER, OPEN-ENDED FILTER BAGS ALIGNED WITH THE APERTURES IN SPACED TUBE SHEETS AND SECURED THERETO, A PAIR OF OPPOSITELY INCLINED COIL SPRINGS IN EACH FILTER BAG EXTENDING BETWEEN OPPOSITE ENDS THEREOF HAVING ONE END SECURED TO THE SECOND TUBE SHEET AND ONE END FREE TO MOVE AXIALLY IN SAID FILTER BAG BETWEEN AN AXIALLY CONTRACTED FILTERING AND AN AXIALLY EXTENDING CLEANING POSITION, A RECIPROCABLE ACTUATING ROD EXTENDING AXIALLY THROUGH SAID HOUSING TO THE PAIRED COIL SPRINGS MOVABLE BETWEEN THE FILTERING AND CLEANING POSITIONS, PACKING MEANS IN SAID HOUSING SURROUNDING THE RECIPROCABLE ACTUATING ROD AND ADAPTED TO PRECLUDE FLUID LEAKAGE AROUND THE ACTUATING ROD, AND MEANS CONNECTING THE ACTUATING ROD TO THE FREE ENDS OF THE COIL SPRINGS IN EACH FILTER BAG WHEREBY MOVEMENT OF THE ACTUATING ROD TO THE FILTERING POSITION AXIALLY CONTRACTS AND RADIALLY DISTENDS THE COIL SPRING AND THE SURROUNDING BAG TO HOLD THE FILTER BAG TIGHTLY WHILE MOVEMENT OF THE ACTUATING ROD TO THE CLEANING POSITION AXIALLY ELONGATES AND RADIALLY CONTRACTS THE COIL SPRING TO PERMIT RELAXING THE SURROUNDING BAG AND SEPARATION OF THE COLLECTED PARTICLES THEREFROM.