Self cleaning variable filter for a dishwasher

Claim 1

IN COMBINATION WITH A WASHING MACHINE INCLUDING WALLS ENCLOSING A WASHING CHAMBER, ONE OF SAID WALLS BEING FORMED TO PROVIDE A SUMP HAVING A SUMP OPENING, MEANS FOR SUPPLYING FLUID TO SAID SUMP, A PUMP HAVING ITS INLET CONNECTED TO SAID SUMP OPENING, FIRST CONDUIT MEANS SELECTIVELY CONNECTED TO RECEIVE THE OUTPUT OF SAID PUMP FOR RETURNING SAID FLUID TO SAID WASHING CHAMBER, SECOND CONDUIT MEANS SELECTIVELY CONNECTED TO RECEIVE THE OUTPUT OF SAID PUMP FOR DIRECTING SAID FLUID TO DRAIN, AND A FILTER IN SAID SUMP FOR COVERING SAID SUMP OPENING, SAID FILTER COMPRISING A FIRST SUPPORT PLATE HAVING AN OUTLET OPENING IN COMMUNICATION WITH SAID SUMP OPENING, A SECOND SUPPORT PLATE IN SPACED PARALLEL RELATIONSHIP TO SAID FIRST SUPPORT PLATE, A HELICAL SPRING INTERPOSED BETWEEN SAID SUPPORT PLATES AND HAVING ITS OPPOSITE ENDS CONNECTED RESPECTIVELY TO SAID SUPPORT PLATES, ONE END OF SAID SPRING CONNECTED TO SAID FIRST SUPPORT PLATE RADIALLY OUTWARDLY OF SAID OUTLET OPENING, AND CONTROL MEANS CONNECTED TO ONE OF SAID SUPPORT PLATES AND MOVABLE RELATIVE TO THE OTHER OF SAID SUPPORT PLATES TO VARY THE DISTANCE BETWEEN SAID SUPPORT PLATES AND THEREBY THE SPACING BETWEEN ADJACENT CONVOLUTIONS OF SAID HELICAL SPRING, SAID CONTROL MEANS POSITIONING SAID ONE OF SAID SUPPORT PLATES IN A FIRST POSITION RELATIVE TO SAID OTHER OF SAID SUPPORT PLATES TO EFFECT A FIRST SPACING BETWEEN SAID ADJACENT CONVOLUTIONS OF SAID SPRING FOR FILTERING SAID SOIL FROM SAID FLUID AS SAID FLUID PASSES FROM THE RADIALLY OUTER SIDE OF SAID SPRING TO SAID OUTLET OPENING WHEN SAID FIRST CONDUIT IS CONNECTED TO RECEIVE THE OUTPUT OF SAID PUMP, AND SAID CONTROL MEANS POSITIONING SAID ONE OF SAID SUPPORT PLATES IN A SECOND POSITION RELATIVE TO SAID OTHER OF SAID SUPPORT PLATES TO EFFECT A SECOND SPACING BETWEEN SAID ADJACENT CONVOLUTIONS OF SAID SPRING FOR CLEANING SAID SOIL FROM SAID FILTER AS SAID FLUID PASSES FROM THE RADIALLY OUTER SIDE OF SAID SPRING TO SAID OUTLET OPENING WHEN SAID SECOND CONDUIT IS CONNECTED TO RECEIVE THE OUTPUT OF SAID PUMP. SAID CONTROL MEANS INCLUDING MEANS RESPONSIVE TO THE PRESSURE IN SAID SECOND CONDUIT MEANS.