Fluid actuated motor

Claim 1

IN A VANE TYPE FLUID ACTUATED MOTOR INCLUDING MEANS DEFINING SECTORAL SIDES HAVING INTERNAL CONFRONTING SURFACES DISPOSED IN SUBSTANTIALLY PARALLEL PLANES; ARCUATE WALL MEANS DISPOSED BETWEEN AND INTERCONNECTING SAID SECTORAL SIDES AND HAVING AN INTERNAL CYLINDRICAL SURFACE WITH ITS AXIS NORMAL TO THE PLANES OF SAID SECTORAL SIDES; END WALL MEANS DISPOSED BETWEEN AND INTERCONNECTING SAID SECTORAL SIDES AND ATTACHED TO AND INWARDLY EXTENDING FROM SAID ARCUATE WALL MEANS AND HAVING A PAIR OF INTERSECTING INTERNAL PARTITION SURFACES COOPERATING WITH THE INTERNAL SURFACES OF SAID ARCUATE WALL MEANS AND SECTORAL SIDES TO DEFINE A CHAMBER OF SECTORAL CROSS-SECTION; A ROTOR LOCATED IMMEDIATE SAID SECTORAL CROSS-SECTION; UPON AN AXLE JOURNALED IN SAID SECTORAL SIDES ADJACENT THE INTERSECTION OF SAID END WALL MEANS, SAID ROTOR INCLUDING SAID AXLE IN SLIDING SEALING CONTACT WITH SAID SECTORAL SIDES AND SAID INTERSECTION OF SAID END WALL MEANS AND A VANE ATTACHED TO SAID AXLE EXTENDING BETWEEN AND NORMAL TO THE PLANES OF SAID INTERNAL SURFACES OF SAID SECTORAL SIDES INTO SAID CHAMBER IN SLIDING SEALING CONTACT WITH SAID SECTORAL SIDES AND ARCUATE WALL MEANS AND ROTATABLE WITH SAID ROTOR BETWEEN A FIRST POSITION ADJACENT ONE OF SAID PAIR OF PARTITION SURFACES AND A SECOND POSITION ADJACENT THE OTHER PARTITION SURFACE, THEREBY DIVIDING SAID CHAMBER INTO A PAIR OF ENCLOSED VARIABLE VOLUME SUB-CHAMBERS ONE SAID SUB-CHAMBER HAVING ITS MAXIMUM AND MINIMUM VOLUME AT THE FIRST AND SECOND POSITIONS RESPECTIVELY OF SAID ROTOR AND VANE AND THE OTHER SAID SUB-CHAMBER HAVING ITS MAXIMUM AND MINIMUM VOLUME AT THE SECOND AND FIRST POSITIONS RESPECTIVELY OF SAID ROTOR AND VANE; AND FLUID CONDUIT MEANS COMMUNICATING WITH EACH SUB-CHAMBER; THE IMPROVEMENT WHICH INCLUDES MOTOR PURGE MEANS COMPRISING TWO PARTS THROUGH SAID VANE AND A NORMALLY CLOSED VALVE ACROSS EACH SAID PORT, ONE VALVE BEING OPERABLE TO OPEN THE PORT ASSOCIATED THEREWITH AT THE FIRST POSITION OF SAID ROTOR AND VANE AND THE OTHER VALVE BEING OPERABLE TO OPEN THE PORT ASSOCIATED THEREWITH AT THE SECOND POSITION OF SAID ROTOR AND VANE.