Roll-type air filter

Claim 1

A FILTER ASSEMBLY INCLUDING A HOUSING HAVING FILTER MEDIUM STORAGE SECTIONS AT OPPOSITE ENDS THEREOF AND A FLOW-THROUGH GAS TREATING SECTION INTERMEDIATE SAID STORAGE SECTIONS WITH AT LEAST ONE ONE OF SAID SECTIONS SERVING AS A ROLL STORAGE SECTION AND RECEIVING AND SUPPORTING A ROLL OF FILTER MATERIAL WOUND UPON A MANDREL HAVING PROJECTING SPINDLES; AN IMPROVED CONSTRUCTION FOR SAID ROLL STORAGE SECTION OF SAID HOUSING COMPRISING: A PAIR OF SPACED, OPPOSITELY DISPOSED END WALLS; AT LEAST TWO SIDE WALLS EXTENDING BETWEEN SAID END WALLS, THE INNER FACES OF SAID SIDE WALLS BEING IN SPACED RELATION FROM EACH OTHER TO DEFINE WITH SAID END WALLS A ROLL SUPPORT ZONE THEREBETWEEN, EACH OF SAID SIDE WALLS BEING INDIVIDUALLY PIVOTALLY MOUNTED TO SAID HOUSING TO PROVIDE UPON PIVOTAL MOVEMENT AWAY FROM SAID ROLL SUPPORT ZONE TWO ROLL IN SERTION OPENINGS THROUGH WHICH SAID ROLL OF FILTER MATERIAL WOUND UPON A MANDREL HAVING PROJECTING SPINDLES CAN BE SELECTIVELY INSERTED; AND A PAIR OF ROLL SUPPORT BEARING ASSEMBLIES PROJECTING INWARDLY FROM THE INNER FACES OF SAID END WALLS AND RECEIVING AND SUPPORTING SAID SPINDLES WITH THE ROLL THEREBETWEEN WHEN SAID ROLL IS IN OPERATIVE POSITION, AT LEAST ONE OF SAID ROLL SUPPORT BEARING ASSEMBLIES BEING PIVOTALLY MOUNTED AS A UNIT ON SAID END WALL AND HAVING SLOT MEANS INTO WHICH ONE OF SAID PROJECTING SPINDLES OF SAID MANDREL CAN NEST, SAID ASSEMBLY BEING MOVABLE TO A POSITION WHEREIN SAID SLOT MEANS CAN BE PROPERLY ALIGNED WITH EITHER OF SAID ROLL INSERTION OPENINGS THROUGH WHICH SAID ROLL IS TO BE SELECTIVELY MOUNTED, SAID SLOT MEANS AFFORDING AN OPEN-ENDED U-SHAPED CHANNEL TO RECEIVE AND SUPPORT A PROJECTING SPINDLE OF SAID ROLL.