Rotary actuator

Claim 1

IN A FLUID PUMP OR MOTOR HAVING A PLURALITY OF RECIPROCAL PISTONS, A SWASH PLATE ENGAGING SAID PISTONS, SAID SWASH PLATE BEING PIVOTABLE ABOUT AN AXIS TO VARY THE DISPLACEMENT OF SAID PUMP OF MOTOR, A ROTARY CONTROL VALVE FOR THE SWASH PLATE COMPRISING A CASING, A ROTOR HAVING A PLURALITY OF VANES THEREON MOUNTED IN SAID CASING, SAID ROTOR HAVING A PILOT PORTION THEREON, SAID PILOT PORTION BEING ROTATABLE ABOUT SAID AXIS AND DRIVINGLY CONNECTED TO SAID SWASH PLATE, SAID PILOT PORTION COMPRISING A JOURNAL FOR SAID SWASH PLATE WHEREBY ROTARY MOVEMENT OF SAID ROTOR WILL PIVOT SAID SWASH PLATE ABOUT SAID AXIS, SAID CASING INCLUDING MEANS DEFINING A FLUID CAVITY FOR EACH OF SAID VANES, SAID VANES DIVIDING EACH OF EACH CAVITIES INTO TWO FLUID PRESSURE CHAMBERS, ARCUATELY DISPLACEABLE MEANS MOUNTED WITHIN SAID ROTOR ADAPTED TO CONNECT ONE OF SAID PRESSURE CHAMBERS FOR EACH OF SAID VANES TO A SOURCE OF FLUID PRESSURE AND THE OTHER CHAMBER FOR EACH OF SAID VANES TO EXHAUST WHEREBY SAID ROTOR WILL FOLLOW ARCUATE MOVEMENT OF SAID ARCUATELY DISPLACEABLE MEANS TO CHANGE THE ARCUATE POSITION OF THE SWASH PLATE IN ACCORDANCE WITH THE ARCUATE POSITION OF SAID ARCUATELY DISPLACEABLE MEANS.