Rotary piston engine

Claim 1

IN A ROTARY PISTON MACHINE: STATIONARY SUPPORTING SHAFT MEANS HAVING AT LEAST ONE HOLLOW END SECTION, AN OUTER ANNULAR ROTOR ROTATABLY SUPPORTED BY SAID SHAFT MEANS AND HAVING ITS INNER PERIPHERY PROVIDED WITH INWARDLY EXTENDING TEETH, SAID OUTER ROTOR FORMING THE HOUSING FOR THE DEVICE, AN INNER ANNULAR ROTOR ARRANGED ECCENTRICALLY WITHIN SAID OUTER ROTOR AND ROTATABLY SUPPORTED BY SAID SHAFT MEANS, SAID INNER ROTOR HAVING ITS OUTER PERIPHERY PROVIDED WITH OUTWARDLY EXTENDING TEETH IN MESHING ENGAGEMENT WITH SAID INWARDLY EXTENDING TEETH OF SAID OUTER ROTOR, SAID INNER ROTOR BEING JOURNALLED ON AN INTERMEDIATE PORTION OF SAID SHAFT MEANS AND SAID OUTER ROTOR BEING JOURNALLED AT ITS OPPOSITE ENDS ON SAID SHAFT MEANS AT REGIONS OF THE SHAFT MEANS SPACED OUTWARDLY FROM THE ENDS OF SAID INNER ROTOR, AND SIDE WALL MEANS NON-ROTATABLY SUPPORTED BY SAID SHAFT MEANS AND RESPECTIVELY EXTENDING IN PLANES SUBSTANTIALLY PERPENDICULAR TO THE AXES OF ROTATION OF SAID ROTORS AND ARRANGED ON OPPOSITE SIDES OF SAID INNER ROTOR, SAID SIDE WALL MEANS TOGETHER WITH SAID INWARDLY AND OUTWARDLY EXTENDING TEETH CONFINING THE WORKING CHAMBERS OF SAID ROTARY PISTON MACHINE, SAID SIDE WALL MEANS BEING PROVIDED WITH PASSAGE MEANS AT LEAST ONE OF WHICH COMMUNICATES WITH THE HOLLOW END SECTION OF SAID SHAFT MEANS, SAID PASSAGE MEANS RESPECTIVELY FORMING AN INLET AT ONE END OF THE ROTORS, AN OUTLET AT THE OTHER END THEREOF FOR RESPECTIVELY ADMITTING FLUID INTO AND DISCHARGING FLUID FROM SAID WORKING CHAMBERS.