Filter media loading arrangement for roll-type air filter

Claim 1

A ROLL-TYPE AIR FILTER OF THE TYPE INCLUDING A FILTER MEDIUM SUPPLY SECTION, A FILTER MEDIUM REWIND SECTION, AN OPEN FACE AIR PASSAGE INTERMEDIATE THE SUPPLY SECTION AND SAID REWIND SECTION, FILTER MEDIUM EXTENDING THROUGH SAID AIR PASSAGE FROM SAID SUPPLY SECTION TO SAID REWIND SECTION SO ALL AIR TO BE FILTERED IS PASSED THROUGH SAID MEDIUM IN SAID AIR PASSAGE, WHERE SAID FILTER MEDIUM IN SAID SUPPLY SECTION IS WOUND UPON A MANDREL HAVING END RIMS AND SPINDLES PROJECTING OUTWARDLY FROM SAID END RIMS, INCLUDING AN IMPROVED FILTER MEDIUM SUPPLY SECTION COMPRISING: (A) A HOUSING INCLUDING FIXED END WALLS, A FORWARD OPEN FACE THROUGH WHICH SAID ROLL IS INSERTED, AND A BOTTOM WALL; (B) BEARING MEANS PROJECTING INWARDLY FROM THE INNER FACES OF SAID END WALLS TO RECEIVE SAID SPINDLES IN NESTING RELATION AND SUPPORT SAID SPINDLES WITH SAID RIMS THEREBETWEEN WHEN SAID ROLL IS IN OPERATIVE POSITION; (C) RAMP MEANS EXTENDING FORWARDLY AND INCLINED DOWNWARDLY FROM EACH OF SAID BEARING MEANS TOWARD SAID FORWARD OPEN FACE, (I) EACH OF SAID RAMP MEANS PROVIDING AN UPPER SURFACE SUPPORTING SAID SPINDLES DURING MOVEMENT TO SAID BEARING MEANS POSITION WITH THE FORWARD ENDS OF SAID UPPER SURFACES BEING SPACED A DISTANCE ABOVE SAID BOTTOM WALL SLIGHTLY LESS THAN THE RADIUS OF SAID END RIMS SO THE CENTER OF SAID PROJECTING SPINDLES IS ABOVE SAID FORWARD END OF SAID UPPER SURFACE WHEN SAID ROLL OF FILTER MEDIUM RESTS ON SAID BOTTOM WALL, (II) SAID RAMP MEANS HAVING OPPOSING EDGES SPACED IN CONVERGING RELATION IN A FRONT-TO-REAR DIRECTION TO PROVIDE FOR LATERAL CENTEING OF SAID ROLL DURING INSERTION BY CONTACT OF EITHER OF SAID RIMS WITH ITS RESPECTIVE EDGE OF SAID RAMP MEANS.