Muffler for internal combustion engine

Claim 1

A MUFFLER FOR AN INTERNAL COMBUSTION ENGINE COMPRISING AN EXHAUST STACK HAVING AN INTAKE AND A DISCHARGE END ADAPTED TO COMMUNICATE WITH THE EXHAUST PORT OF AN INTERNAL COMBUSTION ENGINE, A SWIRL CHAMBER COMPRISING A HOUSING OF GENERALLY CYLINDRICAL SHAPE MOUNTED CO-AXIALLY ON THE DISCHARGE END OF SAID EXHAUST STACK, AN INNER STRUCTURE IN SAID HOUSING COMPRISING A CENTRAL TUBULAR MEMBER OF SMALLER DIAMETER THAN THE HOUSING AND MOUNTED CO-AXIALLY THEREIN, A PAIR OF ROUNDED BOWL SHAPED MEMBERS MOUNTED IN FITTED RELATION WITHIN THE HOUSING AND ONE ON EACH END OF THE TUBULAR MEMBER WITH THEIR OPEN SIDES FACING INWARDLY, EACH BOWL SHAPED MEMBER HAVING A PLURALITY OF RADIALLY INWARD INDENTATIONS IN THE SIDE THEREOF, THE INDENTATIONS IN ONE BOWL SHAPED MEMBER BEING OUT OF LINE WITH THOSE IN THE OTHER, WHEREBY GAS DISCHARGED THROUGH THE EXHAUST STACK INTO THE HOUSING PASSES THROUGH CHANNELS PROVIDED BY THE SPACES BETWEEN THE HOUSING AND THE INDENTATIONS IN THE BOWL SHAPED MEMBER, AND THENCE SWIRLS IN A RECURRING SWIRLING PATH PAST THE DISCHARGE END OF SUCH INDENTATIONS TO THEREBY EXERT AN INJECTOR-LIKE EFFECT ON SUCH INDENTATIONS DURING THE TERMINAL PORTION OF EACH EXHAUST DISCHARGE FROM THE ENGINE, THE HOUSING HAVING AN ESCAPE OPENING THEREIN FOR THE ESCAPE OF THE EXHAUST GASES THEREFROM.