Hydraulic pump or motor with hydraulic pressure-responsive vane

Claim 1

IN A HYDRAULIC MACHINE OF THE VANE TYPE, A ROTOR HAVING RADIALLY DISPOSED VANE SLOTS AND BEING ROTATABLY MOUNTED, A PORT RING SURROUNDING SAID ROTOR AND DEFINING A CHAMBER THEREIN AND BEING MOVABLE ECCENTRIC TO SAID ROTOR AND HAVING A CIRCULAR WALL IN CONTACT WITH THE RADIALLY OUTER EDGES OF SAID VANES, A VANE RADIALLY SLIDABLY DISPOSED IN EACH OF SAID SLOTS AND WITH EACH OF SAID VANES BEING PLANULAR IN THE RADIAL INNER PORTION THEREOF AND WITH THE RADIALLY OUTER PORTION OF EACH OF SAID VANES HAVING A PROJECTION EFFECT FROM THE PLANE OF SAID VANE TO THE ROTATIONALLY TRAILING EDGE WITH RESPECT TO ROTOR ROTATION, THE RADIALLY OUTER SURFACE OF SAID VANE BEING FLAT AND PRESENTING ONE CONTINUOUS OUTER SURFACE WITH A ROTATIONALLY LEADING EDGE AND A ROTATIONALLY TRAILING EDGE, SAID ROTOR HAVING POCKETS FOR FULLY RECEIVING SAID PROJECTIONS UPON FULL RADIAL RETRACTION OF SAID VANES, SAID ROTOR HAVING A FLUID PASSAGEWAY EXTENDING FROM THE ROTATIONALLY LEADING SIDE OF SAID VANE WITH RESPECT TO ROTOR ROTATION AND EXTENDING TO THE RADIALLY INNER SURFACE OF SAID VANE TO ADMIT FLUID FROM SAID CHAMBER TO URGE SAID VANE RADIALLY OUTWARDLY, SAID PROJECTION AND THE RADIALLY OUTER SURFACE OF EACH OF SAID VANES INTERSECTING ON SAID PORT RING WALL AND FORMING THE TRAILING ONE OF SAID OUTER EDGES OF SAID VANE ALONG A LINE ON A PLANE FURTHEST OFFSET FROM AND PARALLEL TO SAID INNER PORTION SO THAT SAID PROJECTION HAS A RADIALLY PROJECTED AREA TO PRESENT ONLY A PROJECTED AREA FOR FLUID PRESSURIZING SAID VANES RADIALLY OUTWARDLY ONLY.