Rotary piston engine

Claim 1

IN A ROTARY PISTON ENGINE: A HOUSING, AN OUTER ROTARY PISTON HAVING A SHAFT FIXED THERETO AND UNILATERALLY JOURNALLED IN ONE SIDE OF SAID HOUSING, A HOLLOW INNER ROTARY PISTON ROTATABLE WITHIN SAID OUTER ROTARY PISTON AND HAVING A SUBSTANTIALLY CYLINDRICAL INNER WALL, SAID INNER ROTARY PISTON HAVING AN INTEGRAL STUD OF SUBSTANTIAL LENGTH EXTENDING INTO THE CAVITY OF THE INNER PISTON ON THE AXIS OF THE CAVITY IN THE INNER ROTARY PISTON, GEAR MEANS INTERPOSED BETWEEN AND DRIVINGLY INTERCONNECTING SAID INNER ROTARY PISTON AND SAID SHAFT FOR ROTATING SAID PISTONS RELATIVE TO EACH OTHER, SAID INNER AND OUTER ROTARY PISTONS BEING ECCENTRICALLY ARRANGED WITH REGARD TO EACH OTHER AND BEING EQUIPPED WITH COOPERATING TEETH ON THE OUTSIDE OF THE INNER PISTON AND ON THE INSIDE OF THE OUTER PISTON, WHICH TEETH CONFINE CHAMBERS WITH EACH OTHER VARYING AS TO VOLUME DURING THE MOVEMENT OF SAID PISTONS RELATIVE TO EACH OTHER, AND AN INSERT MEMBER HAVING ONE END FIXEDLY CONNECTED TO THE SIDE OF SAID HOUSING OPPOSITE THE SAID ONE SIDE OF SAID HOUSING AND EXTENDING INTO SAID INNER ROTARY PISTON AND ROTATABLY RECEIVING SUBSTANTIALLY THE FULL LENGTH OF SAID STUD, SAID INSERT MEMBER ENGAGING SUBSTANTIALLY THE ENTIRE LENGTH OF SAID INNER WALL OF SAID INNER ROTARY PISTON, SAID INSERT MEMBER BEING PROVIDED WITH INLET AND OUTLET PASSAGE MEANS LEADING FROM THE PERIPHERY THEREOF TO THE SAID ONE END THEREOF FOR ADMITTING WORKING FLUID TO AND DISCHARGING WORKING FLUID FROM THE ENGINE, SAID INNER ROTARY PISTON BEING PROVIDED WITH PORTS LOCATED BETWEEN THE RESPECTIVE TEETH THEREOF ADAPTED TO COMMUNICATE WITH AND TO BE CLOSED OFF FROM SAID INLET AND OUTLET PASSAGE MEANS IN RESPONSE TO THE RESPECTIVE RELATIVE POSITION OF SAID INNER ROTARY PISTON WITH REGARD TO SAID INSERT MEMBER.