Gear wheel pump

Claim 1

IN A GEAR WHEEL PUMP, IN COMBINATION: (A) A HOUSING DEFINING A CAVITY THEREIN; (B) A GEAR WHEEL ROTATABLE IN SAID CAVITY ABOUT A FIXED AXIS; (C) AN INTERNALLY TOOTHED RING GEAR IN SAID CAVITY, THE PITCH DIAMETER OF SAID RING GEAR BEING GREATER THAN THAT OF SAID GEAR WHEEL, RESPECTIVE CIRCUMFERENTIAL PORTIONS OF SAID GEAR WHEEL AND OF SAID RING GEAR BEING IN MESHING ENGAGEMENT, AND THE REMAINDERS OF THE CIRCUMFERENCES OF SAID GEAR WHEEL AND OF SAID RING GEAR DEFINING THEREBETWEEN A CRESCENT SHAPED SPACE; (D) DRIVE MEANS FOR ACTUATING ROTATION OF SAID GEAR WHEEL IN A PREDETERMINED DIRECTION; (E) A SEALING MEMBER IN SAID SPACE ADJACENT SAID MESHINGLY ENGAGED PORTIONS AND IN SIMULTANEOUS SEALING ENGAGEMENT WITH SAID GEAR WHEEL AND SAID RING GEAR, SAID SEALING MEMBER BEING MOVABLE IN A RADIALLY EXTENDING DIRECTION WITH RESPECT TO SAID AXIS; (F) FIRST PRESSURE MEANS FOR URGING SAID RING GEAR TOWARD SAID GEAR WHEEL IN SAID RADIALLY EXTENDING DIRECTION; AND (G) SECOND PRESSURE MEANS FOR JOINTLY URGING SAID RING GEAR, SAID GEAR WHEEL, AND SAID SEALING MEMBER TOWARD A PORTION OF SAID HOUSING IN AN AXIAL DIRECTION.