Hydraulic pump

Claim 1

IN A FLUID PUMP INCLUDING SPACED APART CIRCULAR WALLS CONNECTED AT THEIR OUTER PERIMETER TO DEFINE AN IMPELLER CHAMBER BETWEEN THEM, AN IMPELLER ARRANGED IN SAID CHAMBER, A SHAFT MOUNTING SAID IMPELLER, A BEARING SURFACE ON THE INSIDE PERIPHERAL EDGE OF EACH WALL, CONCENTRIC ANNULAR BEARING SURFACES ON THE IMPELLER SEATED IN SAID WALL BEARING SURFACES, A BEARING FOR SAID SHAFT OUTWARDLY OF EACH SIDE WALL, A FLUID CHAMBER IN WHICH SAID SHAFT BEARINGS ARE MOUNTED, CONDUITS IN FLOW COMMUNICATION WITH THE PRESSURE SIDE OF THE IMPELLER CHAMBER AND SAID FLUID CHAMBERS FOR CONVEYING FLUID UNDER PRESSURE FROM THE IMPELLER CHAMBER WHILE THE IMPELLER IS OPERATING TO SAID FLUID CHAMBERS FOR LUBRICATING THE BEARINGS THEREIN, AND MEANS FOR CONDUCTING SAID LUBRICATING FLUID FROM THE SHAFT BEARINGS INTO CONTACT WITH THE IMPELLER BEARINGS FOR LUBRICATING THE SAME AND THEN INTO THE LOW PRESSURE SIDE OF THE IMPELLER.