Vane pump

Claim 1

IN A VANE PUMP INCLUDING A CYLINDRICAL PUMP CHAMBER CLOSED AT ONE SIDE WITH ROTATING VANES THEREIN HAVING A DUCT LEADING INTO SAID PUMP CHAMBER, SAID VANES ROTATING ON A CENTRAL SHAFT AXIALLY PASSING THROUGH SAID PUMP CHAMBER, IN COMBINATION, AN OUTER BUSHING MOUNTED ON THE INNER PERIPHERY OF THE OTHER SIDE OF SAID PUMP CHAMBER AND AN INNER BUSHING MOUNTED OVER SAID CENTRAL SHAFT, SAID CENTRAL SHAFT ROTATING FREELY THEREIN, INNER PROJECTIONS ON SAID OUTER BUSHING DEFINING AT LEAST ONE ARC-SHAPED CHAMBER BETWEEN SAID INNER AND OUTER BUSHINGS ALONGSIDE SAID PUMP CHAMBER, AT LEAST ONE CONNECTING FIRST PASSAGE FROM SAID PUMP CHAMBER OPENING INTO SAID DEFINED ARCSHAPED CHAMBER, AT LEAST ONE SECOND DISCHARGE PASSAGE WITH ITS OPENING IN SAID ARC-SHAPED CHAMBER; AT LEAST ONE OUTER SECTION ON SAID INNER BUSHING EXTENDING INTO SAID DEFINED ARC-SHAPED CHAMBER OF A SIZE SUFFICIENT TO COVER ONE OF SAID PASSAGE OPENINGS; A PINION GEAR COUPLED TO SAID INNER BUSHING MOUNTED OVER SAID CENTRAL SHAFT, SAID CENTRAL SHAFT BEING FREELY ROTATABLE THEREIN; AND, RACK MEANS ACTING ON SAID PINION GEAR, WHEREBY BY TURNING SAID PINION GEAR WITH SAID RACK MEANS, SAID OUTER SECTION WILL TURN SO AS TO COVER ONE OF SAID PASSAGE OPENINGS REGULATING THE AMOUNT OF DISCHARGE FROM SAID VANE PUMP.