US2682312A - Elbow exhaust muffler - Google Patents

Description

June 29, 1954 v c, opK s 2,682,312

ELBOW EXHAUST MUFFLER Fill/ ed Nov. :50, 1949 INVENTOR CLARENCE N. HOPKINS lax/2% ATTORNEY Patented June 29 1954 .UNITED STATES iATENT OFFICE ELBOW EXHAUST MUFFLER Clarence N. Hopkins, Portland, oreg'.

Application November 30, 1949, Serial No. 130,155

3 Claims.

I This invention relates to mufiiers and is particularly adapted for dissipating noise developed by the exhaust of internal combustion engines and the like.

The primary object of my invention is the construction of elbows to be placed in exhaust lines of internal combustion engines that will permit the expansion of exhaust gases, thereby dissipating heat and reducing the exhaust noises.

A further object of my invention is to exhaust the gases within the exhaust pipes by way of my new and improved elbows dissipating heat without creating back pressure.

A still further object of my invention is the designing of heat dissipators in the form of elbows that will take the place of standard elbows in exhaust lines as commonly used today, particularly on large trucks.

Another object of my invention is to construct heat dissipators within the exhaust pipe that are light of weight and of a material that will readily conduct heat, means being provided within the unit for increasing the area exposed to the outside atmosphere assisting in the dissipation of heat.

These and other incidental objects will be apparent in the drawings, specification and claims.

Referring to the drawings:

Figure 1 is a side view of one of my new and improved exhaust elbow mufilers, partially broken away for convenience of illustration.

Figure 2 is an end view of Figure 1, looking in the direction indicated on line 22.

Figure 3 is a sectional view taken on line 3-3 of Figure l of the mufiler looking in the direction indicated.

Figure 4 illustrates a conventional hook up of a series of my elbow mufflers within the exhaust line of a conventional truck, the truck being shown in broken lines, part of the exhaust pipe being broken away.

Referring more specifically tothe drawings:

My new and improved exhaust muffler is formed in approximately the shape of a conventional elbow and is indicated by numeral I. The outside periphery of the elbow is enlarged as indicated at 2 and corrugated as indicated by the corrugations 3 formed in the material making up the muffler. This is best illustrated in Figure 1.

When the mufller is enlarged as at 2, it provides a relatively large expansion chamber 4 for the gases passing through the exhaust pipe line 5 and the stock or tail piece 6. Located within the elbow is a baffle plate 1, running parallel to 2 the flow of exhaust gases and having openings or holes 8 therethrough.

The exhaust gases follow this baffie plate around through the elbow, but a certain portion of the gases or over-pressures are allowed to pass through theopenings 8 into the expansion chamber 4, where the pressures within the exhaust line is reduced, permitting the temperature of the gases to be lowered. This lowering of temperature is further assisted by the corrugations 3 formed in the elbow exposing the gases within the chamber 4 to a considerably larger area of radiation to the outside atmospheric air, further dissipating the heat within the exhaust line. I do not wish tobe limited to placing the baffle plate 1 within the elbow, as I have found in many cases satisfactory operation is obtained without the baffle.

It is a well known fact that if the pressure is reduced within the line heat will be dissipated and if heat is dissipated when the gases enter the outside atmosphere, noises will be reduced to a minimum.

Referring to Figure 4, it is a simple matter to install my mufller within the exhaust pipe 5 lead- 7 ing from the motor not here shown, there being one or more elbow mufilers illustrated at 9, one at 10 and another at H, having preferably a flexible connection [2 connected to the tail pipe 6.

In the average truck, elbows of the common type are used in these places, and by simply substituting my exhaust elbow muflier in place of the regular elbows they serve the same purpose in carrying out the exhaust pipe line, but at the same time they reduce the exhaust noises.

Although certain specific embodiments of the invention have been shown and described, it is obvious that many modifications thereof are possible. The invention, therefore, is not to be restricted except in so far as is necessitated by the prior art and by the spirit of the appended claims.

What I claim is:

1. An exhaust mufiler comprising an elbowshaped casing for insertion in an exhaust line, the ends of said elbow being of uniform diameter for coupling with exhaust pipes, the inner and side surfaces of said elbow being longitudinally curved to radii of a substantially common center and transversely curved to a substantially uniform radius with said ends, and the outer surface of said elbow bein enlarged beyond the curvature that is uniform with said inner and side surfaces to provide an expansion area, the wall of the expansion chamber being transversely corrugated, the corrugations terminating and merging into the curved surface of the inner portion of the elbow.

2. An exhaust muflier comprising an elbowshaped casing for insertion in an exhaust line, the ends of said elbow being of uniform diameter for coupling with exhaust pipes, the inner and side surfaces of said elbow being longitudinally curved to radii of a substantially common center and transversely curved to a substantially uniform radius with said ends, the outer surface of said elbow bein enlarged beyond the curvature that is uniform with said inner and side surfaces to provide an expansion area, said outer surface being transversely corrugated, and a perforated baffle fixed within said elbow on the curvature that is uniform with said inner and side surfaces and cooperative therewith to define a passage through said elbow of substantially uniform diameter with said ends.

3. An exhaust mufiier comprising an elbowshaped casing for insertion in an exhaust line, the inlet and outlet ends of said elbow being of uniform diameter for coupling with exhaust pipes, the inner and side surfaces of said elbow being longitudinally curved to radii of a substantially common center and transversely curved to a substantially uniform radius with said ends, and the outer surface of said elbow being enlarged beyond the curvature that is uniform with said inner and side surfaces to provide an ex pansion area, the elbow on the outer surface havin a central rib extending from the inlet to the outlet openings of said elbow, and transverse corrugations on the outer surface, the corrugations extending from the rib terminating and merging into the inner curved surface which is uniform with said inner and side surface of the elbow.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,098,259 Patten Mar. 3, 1914 1,215,451 White Feb. 13, 1917 1,432,797 Skeels Oct. 24, 1922 1,827,727 Blizard Oct. 20, 1931 1,909,394 Dodge May 16, 1933 2,078,754 Day Apr. 27, 1937 2,141,797 Minella Dec. 27, 1938 2,417,250 Harvey Mar. 11, 1947 2,484,826 Harley Oct. 18,1948 2,512,823 Blundell June 27, 1950 2,566,975 Beranek Sept. 4, 195-1 FOREIGN PATENTS Number Country Date 387,935 Germany Jan. 9, 19 24 99,710 Switzerland June 16, 1923 151,394 Great Britain Sept. 23, 1920

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