Reversible discharge flow variable displacement pump

Claim 1

IN A VARIABLE DISPLACEMENT PUMP THE COMBINATION OF: A SHAFT; A CYLINDRICAL ROTOR RIGIDLY AFFIXED TO SAID SHAFT; A PLURALITY OF RECTANGULAR RIGID BLADES SLIDABLY MOUNTED IN A PLURALITY OF CIRCUMFERENTIALLY SPACED, RADIALLY DISPOSED SLOTS FORMED IN SAID ROTOR THAT EXTEND INWARDLY FROM THE PERIPHERY THEREOF; A RIGID RING HAVING AN INTERNAL DIAMETER GREATER THAN THAT OF SAID ROTOR WHICH SAID RING SURROUNDS AND WHICH IS ENGAGEABLE BY THE OUTER ENDS OF SAID BLADES TO DEFINE A SUCCESSION OF ARCUATE SPACES THEREBETWEEN; A SLIDE BLOCK THAT INCLUDES A CIRCULAR MEMBER IN WHICH SAID RING IS ROTATABLY MOUNTED AND TWO DIAMETRICALLY OPPOSED PISTONS WHICH EXTEND OUTWARDLY FROM SAID MEMBERS; FIRST AND SECOND CYLINDERS IN WHICH SAID FIRST AND SECOND PISTONS ARE SLIDABLY AND SEALINGLY MOUNTED; FIRST AND SECOND FLUID-CARRYING SLEEVES; A HOLLOW CYLINDRICAL HOUSING COMPRISING TWO PARALLEL, LATERALLY SPACED SIDE WALLS HAVING A RING-SHAPED FLANGE EXTENDING BETWEEN THE OUTER CIRCUMFERENTIAL EDGES THEREOF, SAID SIDE WALLS BEING FORMED WITH CENTRALLY DISPOSED OPENINGS THROUGH WHICH SAID SHAFT EXTENDS WHEN SAID ROTOR IS POSITIONED WITHIN SAID HOUSING, WHICH FLANGE SEALINGLY SUPPORTS SAID FIRST AND SECOND CYLINDERS AND SAID FIRST AND SECOND SLEEVES IN SPACED RELATIONSHIP, SAID FIRST AND SECOND CYLINDERS BEING IN DIAMETRIC ALIGNMENT AND SAID FIRST AND SECOND SLEEVES BEING DISPOSED ON OPPOSITE SIDES OF SAID SECOND CYLINDER, WITH BOTH OF SAID SIDE WALLS HAVING INWARDLY PROJECTING PORTIONS THAT EXTEND BETWEEN SAID FIRST AND SECOND CYLINDERS AND ARE AT ALL TIMES SLIDABLY ENGAGED BY OPPOSITE SIDE SURFACES OF SAID ROTOR, BLADES, RING AND CIRCULAR MEMBER, WITH SAID HOUSING BEING INTERNALLY DIVIDED BY SAID ENGAGEMENT INTO A FIRST COMPARTMENT COMMUNICATING WITH SAID FIRST SLEEVE AND A SECOND COMPARTMENT COMMUNICATING WITH SAID SECOND SLEEVE; ELONGATE SEALING MEANS MOUNTED ON SAID FIRST AND SECOND PISTONS, WITH THE MAJOR DIMENSIONS OF SAID SEALING MEANS BEING PARALLEL TO THE LONGITUDINAL AXES OF SAID PISTONS, WHICH SEALING MEANS EXTENDS INTO SAID CIRCULAR MEMBER, AND WHICH SEALING MEANS ARE IN PRESSURE FLUID-SEALING CONTACT WITH SECTIONS OF SAID PROJECTING PORTIONS OF SAID SIDE WALLS AND SECTIONS OF THE INTERIOR SURFACES OF SAID CYLINDERS; FLUID PASSAGE MEANS CAPABLE OF SUPPLYING FLUID UNDER PRESSURE FROM SAID COMPARTMENTS TO THE INNER END PORTIONS OF SAID SLOTS TO FORCE AND MAINTAIN SAID BLADES INTO PRESSURE CONTACT WITH SAID RING TO DEFINE SAID SPACES; AND PRESSURE MEANS TO SUPPLY FLUID TO AND DISCHARGE FLUID FROM THE OUTWARDLY DISPOSED PORTIONS OF SAID CYLINDERS TO MOVE SAID SLIDE BLOCK AND RING RELATIVE TO SAID ROTOR AND BLADES, WITH SAID SHAFT WHEN DRIVEN IN A DIRECTION TO ROTATE SAID BLADES PASSING SAID FIRST SLEEVE TOWARD SAID SECOND SLEEVE CAUSING POSITIVE DISPLACEMENT OF FLUID ADMITTED INTO SAID FIRST COMPARTMENT THROUGH SAID FIRST SLEEVE TO SAID SECOND COMPARTMENT SO LONG AS THE VOLUME OF SAID SPACES ADJACENT SAID SECOND PISTON IS GREATER THAN THAT OF SAID SPACES ADJACENT SAID FIRST PISTON, BUT WITH THE DIRECTION OF FLUID FLOW BEING REVERSED TO EFFECT POSITIVE FLUID DISPLACEMENT FROM SAID SECOND COMPARTMENT TO SAID FIRST COMPARTMENT TO DISCHARGE THEREFROM THROUGH SAID FIRST SLEEVE WHEN THE VOLUME OF SAID SPACES ADJACENT SAID FIRST PISTON IS GREATER THAN THAT OF SAID SPACES ADJACENT SAID SECOND PISTON.