Rotary piston apparatus

Claim 1

A ROTARY INTERNAL COMBUSTION ENGINE COMPRISING A FIXED HOUSING HAVING AN ANNULAR CENTRAL SECTION HAVING AN INTERNAL SURFACE OF OVAL OUTLINE AND A PAIR OF SIDE WALLS RESPECTIVELY CONNECTED TO OPPOSITE ENDS OF SAID CENTRAL SECTION AND EXTENDING RADIALLY INWARDLY BEYOND SAID INTERNAL SURFACE, EACH OF SAID SIDE WALLS BEING FORMED WITH AN OPENING THERETHROUGH; A SHAFT COAXIALLY JOURNALLED IN AND EXTENDING INTO THE INTERIOR OF SAID HOUSING; AN ARM SECURED TO SAID SHAFT INTO THE INTERIOR OF SAID HOUSING SO THAT SAID ARM MAY TRANSMIT ROTARY MOTION TO SAID SHAFT; A PISTON ARTICULATELY CONNECTED WITH SAID ARM, SAID PISTON HAVING A LEADING AND A TRAILING END IN PERMANENT SEALING AND SLIDING ENGAGEMENT WITH SAID INTERNAL SURFACE, SAID PISTON BEING CONSTRUCTED AND ARRANGED TO LEAVE SAID OPENINGS SUBSTANTIALLY UNCOVERED DURING CIRCUMFERENTIAL MOVEMENT OF SAID PISTON SO THAT AIR PASSING THROUGH SAID OPENINGS WILL PASS AXIALLY THROUGH SAID HOUSING SO AS TO DIRECTLY COOL SAID ARM, SAID PISTON AND SAID INTERNAL SURFACE OF SAID HOUSING.