Silencer with freely movable limp diaphragm

Claim 1

A SILENCER FOR REDUCING NOISE AT FREQUENCIES THAT REQUIRE ATTENUATION TO REDUCE NOISE COMPRISING A HOUSING HAVING OPPOSITE SECTIONS SPACED APART PROVIDING A CENTRAL SPACE AND EACH OF WHICH HAS A PASSAGE EXTENDING FROM OUTSIDE AND COMMUNICATING WITH SAID CENTRAL SPACE, A SLEEVE PORTION IN EACH SAID PASSAGE, ONE OF SAID SECTIONS EMBODYING A CONDUIT PORTION AT ONE END IN A SAID PASSAGE AND EXTENDING INTO THE INTERIOR OF SAID HOUSING, SAID LATTER SECTION HAVING A SIDE PORTION EXTENDING ANGULARLY FROM AN END THEREOF AND PROVIDING ANOTHER SPACE BETWEENS AID SIDE PORTION AND SAID SLEEVE PORTION ADAPTED TO RECEIVE SOUND ABSORBING MATERIAL, A FREELY MOVABLE, LIMP DIAPHRAGM HAVING A NATURAL VIBRATION FREQUENCY LOWER THAN SAID FREQUENCIES THAT REQUIRE ATTENUATION IN SAID CENTRAL SPACE AT AN INTERMEDIATE POINT THEREOF AND EMBODYING AN OUTER ATTACHING PORTION ATTACHED TO SAID HOUSING AT AN OUTER PORTION THEREOF AND EMBODYING AN INNER PORTION HAVING A PLURALITY OF HOLES FOR THE ESCAPE OF AIR SPACED OUTWARDLY FROM THE CENTER OF SAID DIAPHRAGM AND COMMUNICATING WITH SAID CENTRAL SPACE.