Muffler.

Application filed August 9, 1911, Serial No. 643,229. '

To alkwhom it may concern:

Be it known that I, Edward Dudley Lewis, a citizen of the United States, and resident of Elmira, in the comity of Che5 mung and State of New York,'have invented certain new and useful Improvements in Mufflers, of which the following is a specification.

This invention relates to mufflers for over10 coining the noise produced by engines that exhaust forcibly into atmosphere, and has for its object a device of the character mentioned that is simple and cheap in construction, and that is also highly efficient.

The muffler in question is specially designed for use in connection with gas engines of the explosion type from which the exhaust is expelled with such force that the noise is particularly objectionable.

Referring to the drawings:—Figure 1 is a central, longitudinal section of the muffler on the line 1, 1 of Fig. 2; and Fig. 2 is a cross-section on the line 2—2 of Fig. 1.

The muffler comprises a plurality of simi25 lar inter-communicating, hollow sections connected together, each section consisting, broadly speaking, of a chamber having inlet and outlet parts that are oppositely located in corresponding positions in each 30 section, and containing perforated partitions that cause the gas to. take a circuitous course through the muffler and gradually transforms the pulsations of the noisy, explosive exhaust to a continuous noiseless dis35 charge.

In the drawings the hollow sections are represented as concave, ami made up from two similar concave members 1, 1, having flanged edges 2, 2, which are cheaply formed 40 by casting or stamping. These sections make a very cheap muffler for they are all made from the same pattern, and so are interchangeable, and besides the rounded, hollow chambers formed by them wheti as-V 45 sembled are specially well adapted to serveas expansion chambers, in which the gas may lose the pressure under which it- is discharged from the engine. The perforated partitions 3 artt, respectively, represented as held between the flanges 2, 2 of the sections, 50 so that they are secured in place by the flanges when the latter are fastened together, by rivets or other means, in forming the sections. The perforated partitions 3 are also made to serve the purpose of de- 5.5 Sectors to turn the gas as it enters the sections outwardly toward the perforations 4 (see Fig..2) through which, it passes in its course to the next section, and are adapted to that purpose by being formed with cen- 60 tral,_ pyramidal projections 5, that extend, in the opposite direction to that in which the gases flow. Thus, the gases are caused to flow through the muffler in a circuitous course, as indicated by the arrow, in which 65 • the gas is given an opportunity to expand as it enters the. sections successively, and is also repeatedly choked back by the perforated partitions 3 till finally it exhausts from, the muffler in a continuous discharge 70 that is noiseless. The end sections are provided with suitable coupling members 6’

The sections are connected to each other by metal | rings 7 that have pliant flanges 8 adapted to be brought together so as to 75 clamp and retain rigidly between them the edges of both the adjacent sections. Thus,, it is obvious that the muffler can be built up from a supply of sections consisting of lirf-^:low members all of which are .of· one pattern, partitions all alike, and coupling ringsall the same'with the exception of those that serve for end couplings which have collars extending, out· from them as shown.