Fluid by-pass filter with antidrainback valve

Claim 1

A THROW-AWAY OIL FILTER FOR INTERNAL COMBUSTION ENGINES OR THE LIKE, THE FILTER COMPRISING A CASING HAVINE A HOLLOW BODY WITH AN INNER WALL, THE BODY HAVING ONE END INTEGRAL THERWITH AND THE OTHER END THEREOF REINFORCED, A HOLLOW FORMANIOUS TUBE FIXED CENTRALLY IN THE CASING, A FILTER ELMENT IN THE CASING COMPRISING A FILTER MEDIUM OF PLEATED PAPER ABOUT THE TUBE, THE PLEATED PAPER HAVING CIRCUMFERENTIAL OUTER EDGES AND OPPOSITE END EDGES, AN END CAP FIXED AT EACH END EDGE OF THE FILTER PAPER, EACH OF THE END CAPS HAVING A BODY PORTION, A CENTRAL PORTION, AND A RIM PORTION, THE RIM PORTION COMPRISING FLANGES SUBSTANTIALLY AT RIGHT ANGLES TO THE BODY AND OVERLAPPING MARGINAL END PORTIONS OF THE CIRCUMFERENTIAL OUTER EDGES OF THE PLEATED FILTER MEDIUM, EACH FLANGE OF EACH CAP HAVING CIRCUMFERENTIALLY SPACED OUTWARDLY EXTENDING RIBS AND PROVIDING PASSAGEWAYS THEREBETWEEN, THE RIBS OF THE FLANGES ENGAGING SPACED PORTIONS OF THE SAID INNER WALL OF THE CASING AND THUS SPACING THE CIRCUMFERENTIAL OUTER EDGES OF THE PLEATED FILTER MEDIUM FROM THE INNER WALL OF THE CASING AND PROVIDING A SURROUNDING CHAMBER FOR OIL PASSING THROUGH THE SAID PASSAGEWAYS BETWEEN THE RIBS ON THE END CAPS, ONE END CAP ADJACENT THE INTEGRAL END OF THE CASING HAVING A CENTRALLY DISPOSED OPENING THEREIN, A SPIDER SUPPORTED BY THE BODY PORTION OF THE SAID ONE END CAP ADJACENT ITS OPENING AND EXTENDING INTO THE HOLLOW FORAMINOUS TUBE, A SPRING SUPPORTED WITHIN THE SPIDER IN THE TUBE, A HIGH-PRESSURE RELIEF VALVE WITHIN THE SPIDER ENGAGED BY THE SPRING, THE HIGH PRESSURE VALVE ENGAGING THE BODY PORTION OF THE SAID ONE END CAP AND NORMALLY CLOSING THE OPENING THEREIN UNDER FORCE OF THE SPRING, A SPRING MEANS HAVING A CENTRAL OPENING BETWEEN SAID ONE END CAP AND THE SAID INTEGRAL END OF THE CASING AND THUS RESILIENTLY URGING THE FILTER ELEMENT TOWARD THE REINFORCED END OF THE CASING, THE SAID OPENING IN THE SPRING MEANS BEING CONCENTRIC WITH THE OPENING IN THE SAID ONE END CAP, THE REINFORCED END OF THE CASING COMPRISING A PARTIAL END WALL SEAMED TO THE BODY OF THE CASING AND REINFORCING PLATE OF A THICKNESS GREATER THAN THE THICKNESS OF THE SAID PARTIAL END WALL AND AFFIXED TO THE SAID PARTIAL END WALL, THE REINFORCING PLATE BEING OF SLIGHTLY LESS DIMENSIONS THAN THE INNER WALL OF THE CASING AND POSITIONED IN THE CASING INWARDLY OF THE SAID SEAM, THE PARTIAL END WALL AND THE REINFORCING PLATE COMPRISING THE CLOSURRE FOR THE REINFORCED END OF THE CASING, THE REINFORCING PLATE HAVING A PLURALITY OF OIL INFLOW OPENINGS THEREIN AND A CENTRAL INWARDLY EXTENDING INTERNALLY THREADED FLANGE FORMING A WALL FOR AN OUTFLOW OPENING AND PROVIDING MEANS FOR ATTACHING THE FILTER TO A MOUNTING, THE OTHER OF THE END CAPS BEING ADJACENT TO THE CLOSED END OF THE CASING, THE SAID OTHER END CAP HAVING A CENTRAL OPENING THEREIN CONCENTRIC WITH THE SAID FORAMINOUS TUBE, A SEALING RING ADJACENT AND SURROUNDING THE OPENING IN THE SAID OTHER END CAP AND SEALINGLY ENGAGING THE REINFORCING PLATE, AN ANTI-DRAINBACK VALVE COMPRISING ATHIN, FLAT DISC HAVING ARCUATE SPRING FINGERS INTEGRAL THEREWITH OUT OF THE PLANE OF THE DISC, THE DISC POSITIONED BETWEEN THE REINFOCING PLATE AND SAID OTHER END CAP AND BEING OF SUCH DIMENSIONS AS TO EXTEND OVER THE OIL INFLOW OPENINGS, SAID SPRING FINGERS ENGAGING SAID OTHER END CAP AND THUS RESILIENTLY URGING THE VALVE DISC OVER THE OIL INFLOW OPENINGS IN THE REINFORCING PLATE BUT ALLOWING THE VALVE DISC TO FLEX AWAY FROM THE REINFORCING PLATE ON FLOW AND PRESSURE OF THE OIL FROM THE INTERNAL COMBUSTION ENGINE THUS OPENING THE OIL INFLOW OPENING TO PERMIT THE OIL TO ENTER THE CASING AND FLOW THROUGH THE PASSAGEWAYS BETWEEN THE RIBS OF THE END CAPS INTO THE CHAMBER SURROUNDING THE PLEATED PAPER THROUGH THE PLEATED PAPER SO AS TO BE FILTERED THEREBY INTO THE CENTRAL FORAMINOUS TUBE AND THEN THROUGH THE OIL OUTFLOW OPENING, BUT UPON A CLOGGING OF THE PLEATED PAPER FILTERING MEDIUM THE SAID HIGH PRESSURE RELIEF VALVE ADJACENT THE INTEGRAL END OPENS THUS ALLOWING THE OIL TO BYPASS THE CLOGGED PLEATED PAPER FILTER AND FLOW DIRECTLY INTO THE FORAMINOUS CENTRAL TUBE AND THROUGH THE OIL OUTFLOW OPENING IN THE REINFORCING PLATE.