Fluid motor

Claim 1

IN A FLUID-OPERATED MOTOR, THE COMBINATION COMPRISING A HOLLOW CYLINDER, A PARTITION WALL MOUNTED IN SAID HOLLOW CYLINDER AND DIVIDING THE SPACE THEREIN INTO A FIRST CHAMBER AND A SECOND CHAMBER, AN END WALL CLOSING EACH END OF SAID CYLINDER, A PRESSURIZED AIR-OPERATED PISTON RECIPROCABLE IN SAID FIRST CHAMBER, PASSAGE MEANS FOR ALTERNATELY ADMITTING AND VENTING AIR INTO AND FROM SAID FIRST CHAMBER, SAID PARTITION WALL AND SAID END WALL OF SAID SECOND CHAMBER EACH HAVING AN AXIAL BORE, A PISTON ROD EXTENDING THROUGH SAID BORES AND ATTACHED AT ONE END TO SAID PISTON, A FREE FLOATING PISTON RECIPROCABLE IN SAID SECOND CHAMBER, SAID FREE FLOATING PISTON ALSO HAVING AN AXIAL BORE THROUGH WHICH SAID PISTON ROD EXTENDS, SAID FREE FLOATING PISTON AND SAID PISTON ROD UNATTACHED TO EACH OTHER, EACH OF SAID PISTONS HAVING A RADIAL VENT PASSAGE IN COMMUNICATION WITH RADIAL VENT PASSAGE IN SAID PISTON ROD, SAID LAST-MENTIONED RADIAL VENT PASSAGES INTERCEPTING AN AXIAL VENT PASSAGE IN SAID PISTON ROD, AND SAID BORE OF SAID FLOATING PISTON HAVING A RING GROOVE THEREIN WHICH IS INTERCEPTED BY THE RADIALLY OUTER END OF ONE OF SAID RADIAL VENT PASSAGES IN SAID PISTON ROD AND WHICH IS ALSO INTERCEPTED BY THE RADIALLY INNER END OF THE RADIAL VENT PASSAGE IN SAID FREE FLOATING PISTON, THE CYLINDER WALL OF SAID FIRST CHAMBER HAVING A RADIAL PASSAGE THERETHROUGH NEAR SAID PARTITION WALL, THE CYLINDER WALL OF SAID SECOND CHAMBER HAVING A RADIAL PASSAGE THERETHROUGH NEAR SAID PARTITION WALL, A VALVE BODY MOUNTED ON THE OUTSIDE OF SAID CYLINDER WALL OVER SAID LAST-MENTIONED RADIAL PASSAGES, FLUID PASSAGE MEANS IN SAID VALVE BODY COMMUNICATING SAID LAST-MENTIONED RADIAL PASSAGES, AND A VALVE ON SAID VALVE BODY HAVING A MOVABLE MEMBER FOR VARYING THE RATE CAPACITY OF HYDRAULIC FLUID FLOW BETWEEN SAID FIRST CHAMBER AND SAID SECOND CHAMBER.