Vane type pump

Claim 1

A REVERSIBLE, VARIABLE, POSITIVE DISPLACEMENT PUMP COMPRISING A HOUSING HAVING A CYLINDRICAL CHAMBER AND AN OPENING THEREFROM THROUGH THE WALL OF SAID HOUSING; A PIVOT RING OF SMALLER OUTSIDE DIAMETER THAN SAID HOUSING CHAMBER AND HAVING A PUMP CHAMBER DEFINED IN PART BY A CYLINDRICAL INTERNAL WALL, A PIVOT PIN OPENING OUTSIDE SAID PUMP CHAMBER OPPOSITE SAID HOUSING OPENING, AND A STEM OF SMALLER CROSS-SECTION THAN SAID HOUSING OPENING, EXTENDING FROM SAID PIVOT RING AND INTO SAID HOUSING OPENING; MEANS PIVOTALLY SECURING SAID PIVOT RING IN SAID HOUSING WITH SAID RING ADAPTED TO SWING THROUGH A NEUTRAL POSITION OF COINCIDING DIAMETERS; A SHAFT THROUGH SAID HOUSING AXIALLY OF SAID CYLINDRICAL HOUSING CHAMBER; A ROTOR ON SAID SHAFT WITHIN SAID PUMP CHAMBER, SAID ROTOR COMPRISING A NARROW CYLINDER HAVING SUBSTANTIALLY RADIAL VANE SLOTS IN THE PERIPHERY OF SAID CYLINDER, INTAKE-DISCHARGE FLOW CHANNELS TERMINATING IN THE PERIPHERY OF SAID CYLINDER BETWEEN SAID VANE SLOTS, AND A VANE SLIDABLY POSITIONED IN EACH OF SAID VANE SLOTS; SLIDABLE BEARING MEANS INTERPOSED BETWEEN SAID PIVOT RING AND SAID ROTOR WITH THE OUTERMOST EDGE OF EACH VANE ADAPTED TO ENGAGE SAID BEARING MEANS TO FORM PERIPHERAL CHAMBERS ABOUT SAID ROTOR; MEANS PROVIDING FOR FLOW OF LIQUID TO AND FROM SAID ROTOR, SAID MEANS COMPRISING A PORTING ROTOR KEYED TO SAID SHAFT WITH ONE END IN EFFECTIVE ENGAGEMENT WITH SAID ROTOR, SAID PORTING ROTOR HAVING A PLURALITY OF RADIAL PORTS ADJACENT