Sound attenuating gas conduit and resonators therefor

Claim 1

A SOUND ATTENUATING RESONATOR FORMED FROM A PAIR OF SHEET-METAL MEMBERS, COMPRISING FIRST WALL AREAS ON SAID MEMBERS SPACED INWARDLY FROM THE PERIPHERAL EDGES THEREOF AND DISPOSED IN SPACED RELATIONSHIP TO EACH OTHER TO FORM A RESONATOR VOLUME, SAID FIRST WALL AREAS CONSTITUTING A CONCAVITY FORMED IN AT LEAST ONE OF SAID MEMBERS AND THAT PORTION OF THE OTHER MEMBER EXTENDING THEREOVER, SECOND WALL AREAS ON SAID MEMBERS CONSTITUTING THE ABUTTING MARGINS THEREOF AND RIGIDLY INTERCONNECTED TO EACH OTHER AND BORDERING SAID FIRST WALL AREAS, AND THIRD WALL AREAS WITHIN THE EXTENT OF SAID SECOND WALL AREAS AND DISPOSED IN SPACED RELATIONSHIP TO EACH OTHER TO FORM A RESONATOR THROAT, SAID THIRD WALL AREAS CONSTITUTING A BEAD FORMED IN AT LEAST ONE OF SAID MEMBERS AND THAT PORTION OF THE OTHER MEMBER EXTENDING THEREOVER, SAID BEAD TERMINATING WITHIN THE EXTENT OF SAID CONCAVITY AND AT LEAST ONE OF SAID MEMBERS BEING PROVIDED WITH AN OPENING WITHIN THE EXTENT OF ITS THIRD WALL AREA WHEREBY SAID THROAT IS OPEN WITHIN AND WITHOUT THE EXTENT OF SAID VOLUME FOR OPERATIVELY INTERCONNECTING SAID VOLUME TO A SOUND ENERGY SOURCE FOR ATTENUATING THE NOISE LEVEL THEREOF, SAID VOLUME BEING COMPLETELY ENCLOSED EXCEPT FOR ITS CONNECTION TO SAID THROAT.