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US 4,396,090 AGranted
Muffler
AssigneeConstruction Metallurgique de Wissembourg S.A. Wimetal
InventorGilbert Wolfhugel
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AssigneeConstruction Metallurgique de Wissembourg S.A. Wimetal
InventorGilbert Wolfhugel
Estimating the term…
A muffler for a motor vehicle is made up of a housing enclosing a pair of sheet metal plates impressed with semi-circular depressions with the plates combining to form a sinuously shaped gas duct of circular cross section. Walls positioned within the housing divide its interior into chambers. Perforations in the gas duct open into the chambers. Lugs are punched out of the sheet metal plates in a uniform pattern and the lugs in one plate are inserted through the corresponding punched openings in the other and are bent into locking engagement with the other plate. These lugs and the corresponding openings contribute to the mechanical strength of the muffler. The ends of the plates forming the inlet and outlet ends for the gas duct have flanges which also contribute to the mechanical strength of the muffler. Cooperating interfitting corrugations in the plates located at specific positions relative to the gas duct prevent partial short circuiting of the exhaust gas flow through the muffler.
A muffler comprising means forming a sound absorbing housing divided into chambers, means forming a sinuous shaped gas duct located within and extending through the chambers within said housing, said means forming said gas duct comprising a pair of sheet metal plates connected together and each of said plates having a semi-circular depression so that the semi-circular depressions in combination form a gas duct for the flow of exhaust gases through said housing, wherein the improvement comprises that each of said plates has punched out lugs forming openings in said plate so that said lugs in one said plate fit into the openings in the other said plate and are bent into engagement with the other said plate for securing said plates together, and means for preventing partial short circuiting between adjacent parts of the sinuously shaped gas duct comprising impressed corrugations in said plates disposed in interengaging form-locking relation.
Dependencies are inferred from the claim text.