Pump or motor

Claim 1

IN A PISTON PUMP THE COMBINATION OF A ROTARY CYLINDER BARREL HAVING A PLURALITY OF CYLINDERS FORMED THEREIN PARALLEL TO THE AXIS OF BARREL ROTATION, AND HAVING PORT HOLES EXTENDING INWARDLY BETWEEN THE ENDS OF EACH SAID CYLINDER, A STATIONARY PIVOT VALVE WITHIN SAID BARREL PROVIDED WITH PASSAGES AND INTAKE AND EXHAUST PORTS, FLEXIBLE MEANS FOR ROTATING SAID BARREL, A PLURALITY OF PISTONS EXTENDING FROM AND ADAPTED FOR ROTARY AND RECIPROCAL MOTION IN EACH END OF SAID CYLINDERS, RIGID SINUOUS THRUST CAMS GENERATED TO URGE SAID PISTONS INWARDLY DURING ROTATION OF SAID CYLINDER BARREL AND MOUNTED AT OPPOSITE ENDS OF SAID BARREL, SAID PISTONS HAVING HEADS EACH HAVING OUTER AND INNER BEARING SURFACES, SAID OUTER BEARING SURFACES BEARING DIRECTLY AGAINST SAID RIGID CAMS, SEPARATE SINUOUS PISTON RETURN CAMS AXIALLY MOVEABLY MOUNTED AT EACH END OF SAID BARREL BEARING AGAINST SAID INNER BEARING SURFACES OF SAID PISTON HEADS TO MOVE THE PISTONS OUTWARDLY IN THE RESPECTIVE CYLINDERS, SAID RETURN CAMS BEING RESILIENT IN THE REGION ENGAGED BY THE HEADS OF THE PISTONS, AND RESILIENT MEANS ACTING ON SAID RETURN CAMS TRUSTING THEM TOWARD THE RESPECTIVE ADJACENT THRUST CAM, SAID RETURN CAMS AND A RESPECTIVE THRUST CAM BEING FIXEDLY CONNECTED TOGETHER AND BEING NON-ROTATIVE WITH RESPECT TO EACH OTHER, SAID RETURN CAMSD AND A RESPECTIVE THRUST CAM FORMING TRACKS TO RECEIVE SAID PISTON HEADS WITH SAID RETURN CAMS BEING CAPABLE OF NON-COMPRESSIVE DEFORMATION TO TAKE UP FOR INACCURACIES.