Self-priming centrifugal pump

Claim 1

IN A SELF-PRIMING PUMP OF THE TYPE HAVING A ROTARY IMPELLER, MEANS FOR SUPPORTING SAID IMPELLER FOR ROTATING ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, WALL STRUCTURE DEFINING A MAIN CHAMBER FOR A RESERVE OF LIQUID IN WHICH SAID IMPELLER IS ROTATABLE AND DEFINING A SUCTION INLET COMMUNICATING CENTRALLY WITH SAID IMPELLER AND A DISCHARGE OUTLET LEADING FROM SAID CHAMBER, AND A PLURALITY OF VANES SPACED ABOUT THE PERIPHERY OF SAID IMPELLER, BEGINNING AT A POINT IN CLOSE PROXIMITY WITH SAID IMPELLER PERIPHERY AND SPIRALING FORWARDLY AND OUTWARDLY THEREFROM TO A POINT PROVIDING SUBSTANTIAL PERIPHERAL OVERLAP OF THE BEGINNING POINT OF THE SUCCEEDING VANE, THE IMPROVEMENT WHEREIN ONLY EACH SAID VANE THAT HAS ITS BEGINNING POINT ORIGINATING ADJACENT TO THE LOWER DOWNWARD SWEEP OF SAID IMPELLER PERIPHERY HAS SAID BEGINNING POINT LOCATED PERIPHERALLY FORWARD IN RELATION TO THE PROCEEDING VANE TO PROVIDE THEREBETWEEN SUBSTANTIALLY RADIAL PASSAGES FROM SAID MAIN CHAMBER TO SAID IMPELLER PERIPHERY THEREBY PROVIDING SHORT DIRECT REVERSE FLOW PATHS FOR A SUBSTANTIAL QUANTITY OF LIQUID CONTAINED IN SAID MAIN CHAMBER TO REACH SAID IMPELLER PERIPHERY THEREBY PROVIDING OPTIMUM CONDITIONS FOR RAPID PRIMING OF SAID PUMP.