Nonclogging centrifugal pump

Claim 1

A CENTRIFUGAL PUMP COMPRISING: A CASING HAVING WALLS DEFINING AN IMPELLER CHAMBER, SAID CHAMBER HAVING AN AXIAL INLET AND A RADIALLY SPACED DISCHARGE OPENING, AN IMPELLER MOUNTED FOR ROTATION IN SAID CHAMBER, SAID IMPELLER HAVING A REAR SHROUD PLATE AND A PLURALITY OF ARCUATELY SPACED SUBSTANTIALLY RADIALLY EXTENDING VANES MOUNTED THEREON, SAID VANES EXTENDING INWARD TO NEAR THE CENTER OF SAID IMPELLER, THE DEPTH OF SAID VANES BEING SMALLER NEAR THE CENTER OF SAID IMPELLER THAN NEAR ITS OUTER PERIPHERY, THE RADIALLY OUTER PORTION OF SAID VANES EXTENDING ACROSS SUBSTANTIALLY THE ENTIRE WIDTH OF SAID CHAMBER, SAID VANES BEING ARRANGED ON SAID IMPELLER SO AS TO DEFINE WITH SAID SHROUD PLATE AND THE OPPOSING SAID WALL OF SAID IMPELLER CHAMBER A PLURALITY OF PASSAGES CONTINUOUS FROM THE INLET OF SAID CHAMBER TO SAID OUTLET, THE MINIMUM SIZE OF SAID PASSAGES BEING AT LEAST EQUAL TO A SPHERE OF THE SAME DIAMETER AS THE WIDTH OF SAID INLET, WHEREBY ANY SOLID BODY ENTERING SAID CHAMBER THROUGH SAID INLET CAN BE PASSED THROUGH SAID IMPELLER TO SAID DISCHARGE.