Fluid pumps

Claim 1

A FLUID PUMP OF THE VANE TYPE COMPRISING A HOUSING HAVING AN INLET AND AN OUTLET BOTH LOCATED AT ONE END THEREOF, A PUMP UNIT WITHIN SAID HOUSING HAVING A DISCLIKE ROTOR PROVIDED WITH RADICALLY EXTENDING SLOTS IN ITS PERIPHERY, VANES SLIDABLY CARRIED THEREIN, A CAM RING SURROUNDING SAID ROTOR AND CONTACTING THE ENDS OF SAID VANES, THE INNER PERIPHERY OF SAID RING DETERMINING THE RADIAL POSITION OF SAID VANES AND FORMING WITH SAID ROTOR ALTERNATE PUMPING CHAMBERS AND IDLE ZONES, AND A PAIR SUBSTANTIALLY IDENTICAL CHEEK PLATES FIXED TO SAID RING AND ENCLOSING SAID ROTOR, FLUID INLET AND OUTLET PASSAGES THROUGH SAID CAM RING TO SAID PUMPING CHABERS AND LOCATED AT THE BEGINNING AND END RESPECTIVELY OF EACH PUMPING CHAMBER, EACH CHEEK PLATE BEING PROVIDED WITH DIAMETRICALLY OPPOSITELY DISPOSED RADIAL INPASSAGES AND ASSOCIATED CHANNELS REGISTERING WITH INNER ENDS OF SAID SLOTS FOR SUBJECTING THE INNER END OF SAID VANES TO INLET PRESSURE FLUID AND ALSO PROVIDED WITH DIAMETRICALLY OPPOSITELY DISPOSED OUTLET PASSAGES FOR RECEIVING THE FLUID DISCHARGED FROM SAID PUMPING CHAMBERS THROUGH SAID OUTLETS IN SAID CAM RINGS, THE OUTLET PASSAGES OF EITHER ONE OF SAID CHEEK PLATES BEING CAPABLE OF REGISTERING WITH THE SAID OUTLET LOCATED AT ONE END OF SAID HOUSING, MEANS FOR RETAINING SAID PUMP UNIT FIXED WITH REFERENCE TO SAID HOUSING, A DRIVE SHAFT EXTENDING THROUGH AND JOURNALED IN SAID ONE END OF SAID HOUSING AND PASSING THROUGH SAID CHEEK PLATES AND ROTOR AND SPLINED TO THE LATTER FOR ROTATING THE SAME WITHIN THE PUMP UNIT, SAID HOUSING HAVING A DETACHABLE CLOSURE PLATE LOCATED AT THE OTHER END THEREOF AFFORDING ACCESS TO SAID PUMP UNIT SO THAT SAID UNIT MAY BE READILY AXIALLY REMOVED FROM SAID DRIVE SHAFT, REVERSED AND REPLACED THEREON TO THUS PROVIDE FOR THE ROTATION OF SAID ROTOR IN EITHER DIRECTION.