Fluid motor and pump having expansible chambers

Claim 1

A ROTATING MACHINE OF THE EXPANSIBLE CHAMBER TYPE COMPRISING A FIXED CYLINDER PIERCED BY INLET AND EXHAUST PORTS, A HOLLOW ROTOR MOUNTED TO TURN WITHIN SAID CYLINDER ON A SHAFT COAXIAL THEREWITH, SAID ROTOR BEING PROVIDED WITH AT LEAST TWO PORTS, EACH OF WHICH IS POSITIONED TO REGISTER SUCCESSIVELY WITH SAID INLET AND EXHAUST PORTS DURING EACH REVOLUTION OF SAID ROTOR, AT LEAST TWO PART-CYLINDRICAL PISTONS MOUNTED WITHIN SAID ROTOR, SAID PISTONS DEFINING BETWEEN THEM AND THE WALLS OF SAID ROTOR AT LEAST TWO EXPANSIBLE CHAMBERS COMMUNICATING WITH SAID ROTOR PORTS, CRANK MEANS ROTATABLY MOUNTED IN SAID ROTOR, SAID PISTONS BEING ROTATABLY CONNECTED TO THE CRANK PORTION OF SAID CRANK MEANS, AND MEANS FOR CAUSING SAID CRANK MEANS TO ROTATE IN SAID ROTOR AS SAID ROTOR ITSELF TURNS, SAID CRANK MEANS CAUSING SAID PISTONS TO OSCILLATE RELATIVE TO SAID ROTOR WHILE TURNING ABOUT THE AXIS OF SAID ROTOR IN THE SAME DIRECTION AND AT THE SAME AVERAGE SPEED AS SAID ROTOR, SAID OSCILATION OF SAID PISTONS IN SAID ROTOR BRINGING THEIR ENDS TOWARDS AND AWAY FROM EACH OTHER TO EXPAND AND CONTRACT SAID CHAMBERS.