Rotary piston engine

Claim 1

A ROTARY-PISTON INTERNAL COMBUSTION ENGINE OF TROCHOIDAL CONSTRUCTION, COMPRISING: ENCLOSURE BODY MEANS PROVIDED WITH A MULTI-ARCHED INNER SURFACE AND WITH SIDE PARTS, SAID MULTI-ARCHED INNER SURFACES HAVING ZONES APPROACHING MORE CLOSELY THE AXIS OF THE ENGINE, RECESSED SPARK PLUG MEANS ACCOMMODATED WITHIN BORE MEANS PROVIDED IN SAID ENCLOSURE BODY MEANS, POLYGONAL PISTON MEANS PROVIDED WITH PISTON RECESSES IN THE PISTON FLANKS THEREOF, MEANS INCLUDING ECCENTRIC MEANS FOR SUPPORTING THEREON SAID PISTON MEANS TO PROVIDE A SLIDING MOVEMENT OF THE PISTON CORNERS ALONG SAID INNER SURFACES DURING THE ROTARY MOVEMENTS OF SAID PISTON MEANS RELATIVE TO SAID ENCLOSURE BODY MEANS AND TO SAID ECCENTRIC MEANS, GAS EXCHANGE CHANNEL MEANS PROVIDED IN SAID ENCLOSURE BODY MEANS WITHIN THE AREA OF ONE OF SAID ZONES, SAID GAS EXCHANGE CHANNEL MEANS BEING VALVED BY THE PROTARY MOVEMENTS OF SAID PISTON MEANS, AND GROOVE MEANS ARRANGED IN EACH PISTON FLANK BELOW THE NORMAL PISTON FLANK SURFACE WHICH EXTENDS FROM THE CORRESPONDING PISTON RECESS INTO THE AREA OF THE TRAILING PISTON CORNER AND TERMINATES NEAR SAID TRAILING PISTON CORNER, SAID GROOVE MEANS BEING SUBSTANTIALLY IN ALIGNMENT WITH THE APERTURE OF SAID BORE MEANS TO PERMIT THE ESCAPE OF GASES FROM SAID BORE MEANS THROUGH SAID GROOVE MEANS.