Engine muffler and method of manufacturing the same

Details Engine muffler and method of manufacturing the same Engine muffler and method of manufacturing the same

2005-02-22

2005-02-22

Lockett, Kimberly (Department: 2837)

Acoustics

Sound-modifying means

Muffler, fluid conducting type

C181S222000, C181S256000, C029S890080

Reexamination Certificate

active

06857502

ABSTRACT:
This engine muffler has a sound absorbing material interposed between an internal tube and an external tube which is formed with a projection projecting toward the sound absorbing material along almost its entire periphery. When interposing the sound absorbing material between the internal tube and the external tube and drawing the end of the external tube for manufacturing the muffler, the projection projecting toward the sound absorbing material is formed on the external tube almost along its entire periphery after inserting the sound absorbing material between the internal tube and the external tube but before drawing the end of the external tube.

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