Abstract: An exhaust muffler having a protective shield to reduce noise radiation and to decrease the temperature of the exhaust gases being discharged from the muffler. The muffler is composed of an outer body enclosed at its ends by flanges, and an outer insulated shell is spaced outwardly from the body and is connected to the peripheral edges of the flanges. Holes are provided in the flanges which communicate with the space between the shell and the body so that air is drawn by convection through the space between the outer body and the shell. A tubular member is spaced outwardly of the outlet pipe of the muffler and the outer end of the tubular member projects outwardly beyond the outer end of the outlet pipe.

Abstract: A temperature responsive protective cap for a gas exhaust pipe. The cap includes a base portion which is connected to the upper end of the exhaust pipe of an internal combustion engine, and a lid or cover is hinged to the base and can be pivoted between closed and open positions. A bi-metallic element is interconnected between the base and the lid, and on operation of the engine the increase in temperature in the exhaust pipe will actuate the bi-metallic element to pivot the lid to the open position.