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US 4,736,817 AGranted
Stamp formed muffler
AssigneeAP Industries, Inc.
InventorJon Harwood
Life of this patent
Estimating the term…
Abstract
A muffler is provided with a pair of stamp formed internal plates and a pair of stamp formed external shells. The internal plates define inlet and outlet tubes at least portions of which are provided with arrays of perforations or louvers. One or more tuning tubes may be stamp formed in the internal plates and one or more low frequency resonator chambers may be stamp formed from portions of either the internal plates or the external shells. The external shells may further be configured to define high frequency tuning chambers of a selected size and shape.
Claims8
An exhaust muffler comprising:
- first and second stamp formed internal plates secured in face to face relationship with one another and defining an array of tubes therebetween, said array of tubes defining at least one inlet and at least one outlet to the muffler, selected portions of said tubes being perforated;
- and
- first and second stamp formed external shells, said first and second external shells each including peripheral portions with the respective peripheral portions of said first and second external shells being secured in contact with one another and with at least portions of the respective first and second internal plates, said first and second external shells further including at least one crease connecting two spaced apart locations on the peripheral portions thereof, said crease being disposed substantially in face to face contact with the respective first and second internal plates substantially continuously between the peripheral portions of said external shell, such that the crease and the peripheral portions of said external shell define a plurality of chambers, with at least one of said chambers substantially enclosing the perforated portions of the array of tubes formed by said internal plates.
An exhaust muffler comprising:
- first and second internal plates disposed in face-to-face relationship and stamp formed to define an array of tubes therebetween, said array of tubes defining at least one inlet and at least one outlet to the muffler, selected portions of said tubes being perforated;
- and
- first and second external shells stamp formed to define peripheral portions disposed respectively substantially in contact with one another and with said internal plates, said external shells each further including a plurality of creases, said creases being substantially continuously in contact with portions of said internal plates, such that said creases and said peripheral portions of said external shells define a plurality of chambers surrounding and enclosing selected portions of said internal plates.
Dependencies are inferred from the claim text.