Fluid pressure powered piston motor

Claim 1

A FLUID PRESSURE POWERED OSCILLATING PISTON MOTOR COMPRISING A PISTON CYLINDER HAVING A HEAD CLOSING EACH END THEREOF, A PRESSURE FLUID INLET OPENING INTO THE CYLINDER THROUGH THE CENTRAL AREA OF THE SIDE WALL OF THE CYLINDER, A PISTON OSCILLABLE IN THE CYLINDER IN RESPONSE TO AN UNINTERRUPTED FLOW OF PRESSURE FLUID FROM THE INLET BEING CAUSED TO FLOW ALTERNATELY TO OPPOSITE ENDS OF THE CYLINDER, A PISTON ROD EXTENDING AXIALLY FROM AN END OF THE PISTON AND PROJECTING WITH A SLIDE FIT THROUGH A HEAD OF THE CYLINDER, A VENT PASSAGE THROUGH THE ROD TO THE PISTON AND COMMUNICATING RADIALLY THROUGH THE PERIPHERY OF THE PISTON WITH THE CYLINDER, AN UNSTABLE CONICAL SPRING DISC VALVE SUPPORTED BETWEEN THE PERIPHERY OF THE PISTON AND THE CENTRAL AREA OF THE SURROUNDING CYLINDER WALL, THE SPRING DISC HAVING A FIRST CONDITION COMMUNICATING THE INLET WITH ONE END OF THE CYLINDER AND COMMUNICATING THE OPPOSITE END OF THE CYLINDER WITH THE VENT PASSAGE, THE SPRING DISC HAVING A COLLAPSED SECOND CONDITION WHEREIN THE COMMUNICATION OF THE INLET AND VENT PASSAGE WITH SAID ENDS OF THE CYLINDER IS REVERSED, THE SPRING DISC IN ITS FIRST CONDITION BIASING THE PISTON TOWARD ONE END OF THE CYLINDER, THE SPRING DISC IN ITS SECOND CONDITION BIASING THE PISTON TOWARD THE OPPOSITE END OF THE CYLINDER, AND THE SPRING DISC BEING COLLAPSIBLE THROUGH CENTER FROM ONE CONDITION TO THE OTHER AS THE PISTON IS OSCILLATED BY PRESSURE OF FLUID CAUSED TO FLOW FROM THE INLET ALTERNATELY TO OPPOSITE ENDS OF THE PISTON CYLINDER AS A CONSEQUENCE OF THE CHANGING CONDITIONS OF THE SPRING DISC.