Muffler construction

Claim 1

AN EXHAUST MUFFLER COMPRISING AN ELONGATED TUBULAR CASING, A PAIR OF CLOSURE PLATES ONE OF WHICH IS SECURED TO THE INLET END OF SAID CASING AND THE OTHER OF WHICH IS SECURED TO THE OUTLET END OF SAID CASING, A FIRST PAIR OF TRANSVERSELY DISPOSED BAFFLE PLATES, ONE OF WHICH IS MOUNTED IN FIXED POSITION IN SAID CASING IN LONGITUDINALLY SPACED RELATION TO SAID INLET END CLOSURE PLATE THEREBY DEFINING WITH SAID INLET END CLOSURE PLATE AN INLET END CHAMBER AND THE OTHER OF WHICH IS MOUNTED IN FIXED POSITION IN SAID CASING IN LONGITUDINALLY SPACED RELATION TO SAID OUTLET END CLOSURE PLATE THEREBY DEFINING WITH SAID OUTLET END CLOSURE PLATE AN OUTLET END CHAMBER, A SECOND PAIR OF TRANSVERSELY DISPOSED BAFFLE PLATES, ONE OF WHICH IS MOUNTED IN FIXED POSITION IN SAID CASING IN LONGITUDINALLY SPACED RELATION TO THE SAID ONE OF SAID FIRST PAIR OF BAFFLE PLATES THEREBY DEFINING WITH SAID ONE OF SAID FIRST PAIR OF BAFFLE PLATES A FIRST INTERMEDIATE CHAMBER AND THE OTHER OF WHICH IS MOUNTED IN FIXED POSITION IN SAID CASING IN LONGITUDINALLY SPACED RELATION TO THE SAID OTHER OF SAID FIRST PAIR OF BAFFLE PLATES THEREBY DEFINING WITH SAID OTHER OF SAID FIRST PAIR OF BAFFLE PLATES A SECOND INTERMEDIATE CHAMBER, AND THE SAID ONE OF SAID SECOND PAIR OF BAFFLE PLATES DEFINING WITH THE SAID OTHER OF SAID SECOND PAIR OF BAFFLE PLATES A CENTRAL RESONATING CHAMBER, THE SAID ONE OF SAID SECOND PAIR OF BAFFLE PLATES HAVING A CENTRALLY DISPOSED OPENING PROVIDING COMMUNICATION BETWEEN SAID CENTRAL RESONATING CHAMBER AND SAID FIRST INTERMEDIATE CHAMBER AND THE SAID OTHER OF SAID SECOND PAIR OF BAFFLE PLATES HAVING A CENTRALLY DISPOSED OPENING PROVIDING COMMUNICATION BETWEEN SAID CENTRAL RESONATING CHAMBER AND THE SAID SECOND INTERMEDIATE CHAMBER; A PAIR OF SIMILAR TUBULAR INLET UNITS WHICH ARE CLOSED AT ONE END THEREOF AND ARE PROVIDED THROUGHOUT THE PERIPHERY THEREOF WITH A MULTIPLICITY OF APERTURES ARE MOUNTED IN SAID INLET END CHAMBER BY AND BETWEEN SAID INLET END CLOSURE PLATE AND THE SAID ONE OF SAID FIRST PAIR OF BAFFLE PLATES IN SPACED PARALLEL RELATION WITH THE OPEN ENDS THEREOF EXTENDING OUT BEYOND SAID INLET END CLOSURE PLATE; A PAIR OF SIMILAR TUBULAR OUTLET UNITS WHICH ARE CLOSED AT ONE END THEREOF AND ARE PROVIDED THROUGHOUT THE PERIPHERY THEREOF WITH A MULTIPLICITY OF APERTURES ARE MOUNTED IN SAID OUTLET END CHAMBER BY AND BETWEEN SAID OUTLET END CLOSURE PLATE AND THE SAID OTHER OF SAID FIRST PAIR OF BAFFLE PLATES IN SPACED PARALLEL RELATION WITH THE OPEN ENDS THEREOF EXTENDING OUT BEYOND SAID OUTLET CLOSURE PLATE; AN ELONGATED OPEN ENDED TUBULAR FLOW PIPE WHICH EXTENDS THROUGH SAID FIRST INTERMEDIATE CHAMBER AND SAID CENTRAL RESONATING CHAMBER AND PROVIDES COMMUNICATION BETWEEN SAID INLET END CHAMBER AND SAID SECOND INTERMEDIATE CHAMBER, A SECOND ELONGATED OPEN ENDED TUBULAR FLOW PIPE WHICH EXTENDS THROUGH SAID CENTRAL RESONATING CHAMBER AND SAID SECOND INTERMEDIATE CHAMBER AND PROVIDES COMMUNICATION BETWEEN SAID FIRST INTERMEDIATE CHAMBER AND SAID OUTLET END CHAMBER; ADAPTER MEANS BY WHICH ONE OF SAID INLET UNITS IS REMOVABLY CONNECTED TO AN EXHAUST PIPE AND PLUG MEANS BY WHICH THE OPEN OUTER END OF THE OTHER OF SAID INLET UNITS IS CLOSED; AND OTHER ADAPTER MEANS BY WHICH ONE OF SAID OUTLET UNITS IS REMOVABLY CONNECTED TO A TAIL PIPE AND OTHER PLUG MEANS BY WHICH THE OPEN END OF THE OTHER OF SAID OUTLET UNITS IS CLOSED.