Filter apparatus

Claim 1

IN AN AUTOMATIC FILTER FOR REMOVING IMPURITIES FROM LIQUIDS, A FILTER HOUSING INCLUDING OPPOSED UPRIGHT SIDE WALLS, OPPOSITELY ARRANGED CONTINUOUS GUIDE FLANGES MOUNTED ON AND PROJECTING INWARDLY FROM EACH SIDE WALL DEFINING OPPOSED LOOPED GUIDES, A POWER DRIVEN MEANS WITHIN SAID HOUSING, A CONTINUOUS SPROCKET CHAIN MOVABLY MOUNTED ON AND AROUND EACH FLANGE AND SAID DRIVE MEANS, A CONTINUOUS SEALING BAR OF PLASTIC MATERIAL ON AND PROJECTING RADIALLY OUTWARD FROM THE INNER EDGE OF EACH FLANGE THROUGHOUT ITS LENGTH, A CONTINUOUS FILTER SCREEN IN THE FORM OF A LOOP CORRESPONDING TO SAID GUIDES WITH ITS EDGES OVERLAPPING SAID FLANGES RESPECTIVELY AND REMOVABLY MOUNTED ON AND CONNECTED TO CORRESPONDING PORTIONS OF SAID CHAINS FOR MOVEMENT THEREWITH, CONTINUOUS PLASTIC SEALING AND WEAR STRIPS SECURED UPON THE UNDERSURFACE OF SAID SCREEN ADJACENT AND ALONG ITS EDGES THROUGHOUT ITS LENGTH COOPERATIVELY ENGAGING SAID SEALING BARS RESPECTIVELY; EACH CHAIN INCLUDING A SERIES OF ALIGNED PIVOTALLY INTERCONNECTED SEGMENTS, SOME OF SAID PIVOTAL CONNECTIONS INCLUDING PINS EXTENDING LATERALLY INWARD OF SAID CHAIN, AN ELONGATED UPRIGHT GURARD RAIL SPACED INWARDLY FROM AND PARALLEL TO AND MOUNTED ON EACH SIDE WALL INCLUDING A CONTINUOUS BOTTOM EDGE RADIALLY SPACED FROM A FLANGE RESPECTIVELY, SAID PINS RETAININGLY AND SLIDABLY ENGAGED BY SAID GUARD RAIL FOR HOLDING SAID CHAINS RESPECTIVELY ON SAID FLANGES, SAID PINS HAVING OUTTURNED ENDS MOUNTING SAID SCREEN, AND AN ELONGATED HOLD-DOWN BAR SPACED INWARDLY FROM AND PARALLEL TO AND MOUNTED ON SAID GUARD RAIL ABOVE SAID SCREEN LOOSELY ENGAGING AND RETAINING THE SCREEN UPON SAID SEALING BAR.