Centrifugal nonclogging pump

Claim 1

A CENTRIFUGAL PUMP FOR PUMPING A MIXTURE OF LIQUID AND STRINGY SOLID MATERIAL SUSPENDED IN SUCH LIQUID COMPRISING A HOUSING HAVING A CYLINDRICAL PERIPHERAL WALL WITH A DISCHARGE APERTURE THEREIN, A CLOSED END AND AN OPEN END, AND END PLATE EXTENDING ACROSS AND SECURED ON THE OPEN END OF SAID HOUSING, A DISCHARGE DUCT EXTENDING UPWARD FROM SUCH DISCHARGE APERTURE IN SAID PERIPHERAL HOUSING WALL TO A LOCATION A SUBSTANTIAL DISTANCE ABOVE SAID HOUSING, A ROTARY SHAFT IN SAID HOUSING EXTENDING SUBSTANTIALLY PERPENDICULAR TO SAID END PLATE, AND AN IMPELLER SECURED ON SAID SHAFT, ROTATABLE THEREBY AND INCLUDING RADIALLY DISPOSED IMPELLER BLADES, EACH BLADE BEING OF ANGLE CROSS SECTION AND HAVING A FIRST FLANGE DISPOSED IN A PLANE SUBSTANTIALLY PARALLEL TO THE AXIS OF SAID SHAFT AND EXTENDING RADIALLY FROM SUCH AXIS AND A SECOND FLANGE PROJECTING IN THE DIRECTION OF ROTATION OF SAID IMPELLER FROM THE EDGE OF SAID FIRST FLANGE ADJACENT TO SAID END PLATE AND DISPOSED CLOSE TO SAID END PLATE, SAID END PLATE HAVING THEREIN ARCUATE INTAKE APERTURES CONCENTRIC WITH SAID SHAFT AND SPACED APART CIRCUMFERENTIALLY TO ENABLE MATERIAL TO BE PUMPED TO ENTER SAID HOUSING THERETHROUGH, AND THE EDGE OF SAID SECOND FLANGE OF EACH IMPELLER BLADE COOPERATING WITH ONE EDGE OF EACH INTAKE APERTURE TO SEVER BY THE INTERACTION OF SUCH EDGES STRINGY MATERIAL EXTENDING THROUGH SUCH AN INTAKE APERTURE IN SAID END PLATE.