Single vane pump

Claim 1

A ROTARY PUMP COMPRISING A FIRST HOUSING MEMBER HAVING A FIRST SHAFT OPENING THERETHROUGH AND A RECESSED PORTION SURROUNDING THE SAID SHAFT OPENING HAVING A CYLINDRICAL SURFACE AND A PLANAR END SURFACE, A SECOND HOUSING MEMBER HAVING A SECOND SHAFT OPENING THERETHROUGH AND A PLANAR SURFACE THEREON, THE SAID SECOND HOUSING MEMBER BEING ADAPTED TO ABUT THE SAID FIRST HOUSING MEMBER AND PROVIDE A CIRCULAR CHAMBER FORMED BY THE CYLINDRICAL SURFACE AND PLANAR END SURFACE OF THE SAID FIRST HOUSING MEMBER AND THE PLANAR SURFACE OF THE SAID SECOND HOUSING MEMBER, THE SAID CHAMBER BEING ECCENTRIC TO THE SAID SHAFT OPENINGS, A ROTATABLE SHAFT EXTENDING THROUGH THE SAID SHAFT OPENINGS IN SEALING RELATION THEREWITH, THE SAID SHAFT HAVING A KEY RECESS THEREIN INTERMEDIATE THE SAID HOUSING PLANAR SURFACES, A ROTOR COMPRISING A DISCONTINUOUS ANNULAR RING HAVING A SINGLE GAP THEREIN AND SECURED TO THE SAID SHAFT BY MEANS OF A LONGITUDINALLY EXTENDING KEY SLOT IN THE INNER SURFACE OF THE SAID RING AND A KEY LOCATED IN THE SAID KEY RECESS IN THE SAID SHAFT, THE SAID ROTOR BEING ARRANGED FOR ROTATION WITHIN THE SAID CHAMBER UPON ROTATION OF THE SAID SHAFT WITH THE ROTOR IN SEALING RELATION WITH THE SAID CYLINDRICAL SURFACE AT ONE LOCATION AND FORMING WITH THE SAID HOUSING MEMBERS A CRESCENT-SHAPED PUMPING CHAMBER, A VANE MEMBER RECIPROCABLY MOUNTED BETWEEN THE ENDS OF THE SAID DISCONTINUOUS RING ROTOR FOR ROTATION THEREWITH IN SEALING RELATION WITH THE SAID CYLINDRICAL SURFACE, THE END SURFACE OF THE SAID ROTOR AND THE ENDS OF THE SAID VANE MEMBER BEING IN SEALING RELATION WITH THE SAID PLANAR SURFACE OF THE SAID TWO HOUSING MEMBERS, A LIQUID INLET PASSAGEWAY THROUGH THE SAID SECOND HOUSING MEMBER COMMUNICATING WITH THE SAID CRESCENT-SHAPED CHAMBER, AN OPENING THROUGH THE SAID RING CLOSELY ADJACENT THE SAID GAP THEREIN AND