Abstract

An exhaust muffler for internal combustion engines adapted to receive exhaust gases from exhaust ports of internal combustion engines. The muffler comprising a hollow body having a peripheral edge adjacent to which a flexible diaphragm is resiliently supported to allow exhaust gas to escape between the peripheral edge of the body and an adjacent side of the diaphragm; the diaphragm being provided with resilient means for adjusting said diaphragm and tending to hold the diaphragm toward said peripheral edge of the body portion of the muffler and in substantially contiguous relationship therewith whereby exhaust forces internally of said body deflect the diaphragm structure away from the peripheral edge of the body and allow exhaust gases to escape between the peripheral edge and the diaphragm.

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