Self-priming pump

Claim 1

IN A CENTRIFUGAL PUMP; A SUPPORT BRACKET, AN OPEN FACED IMPELLER HAVING ITS CLOSED SIDE ADJACENT ONE FACE OF SAID BRACKET, A DIFFUSER SECURED TO SAID BRACKET AND SURROUNDING THE PERIPHERY OF SAID IMPELLER AND HAVING PASSAGES EXTENDING OUTWARDLY THERETHROUGH FOR PUMPED LIQUID, A WEAR PLATE ON THE OPEN SIDE OF SAID IMPELLER ADJUSTABLY CARRIED BY SAID DIFFUSER FOR ADJUSTMENT TOWARD AND AWAY FROM THE OPEN SIDE OF SAID IMPELLER AND HAVING A CENTRAL APERTURE COMMUNICATING WITH THE CENTRAL REGION OF SAID IMPELLER, A PUMP CASE SECURED TO SAID BRACKET AND HAVING AN OUTER REGION SEALED TO SAID BRACKET AND AN INNER REGION SEALED TO SAID DIFFUSER AND HAVING A FIRST LARGER CHAMBER THEREIN FORMING A SUCTION CHAMBER AND COMMUNICATING WITH THE APERTURE IN SAID WEAR PLATE AND HAVING A SECOND SMALLER CHAMBER THEREIN FORMING A DISCHARGE CHAMBER AND COMMUNICATING WITH THE REGION AROUND THE PERIPHERY OF SAID DIFFUSER, SAID FIRST CHAMBER EXTENDING TO A LEVEL SUBSTANTIALLY LOWER THAN THE SAID CENTRAL APERTURE OF SAID WEAR PLATE TO FORM A REGION FOR COLLECTING HEAVY TRASH IN WATER ENTERING SAID FIRST CHAMBER.