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Publication numberUS3166152 A
Publication typeGrant
Publication dateJan 19, 1965
Filing dateDec 4, 1961
Priority dateDec 4, 1961
Publication numberUS 3166152 A, US 3166152A, US-A-3166152, US3166152 A, US3166152A
InventorsConlin Patrick J
Original AssigneeConlin Patrick J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Muffler device
US 3166152 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Jan. 19, 1965 P. J. CONLIN 3,166,152


United States Patent Ofiice 3,166,152 Patented Jan. 19, 1965 3,166,152 MUFFLER DEVICE Patrick J. Conlin, 1770 Davie St Vancouver, British Columbia, Canada Fined Dec. 4, 1961, Ser. No. 156,584 3 Claims. (Cl. 181-58) This invention relates to mufflers for the exhaust of internal combustion engines and more particularly to an improved design characterized by the utilization of the individual pulsations of the exhaust gases as the means for effecting the silencing or mufiling of the exhaust.

The principal object of the invention is to provide a mufiler for internal combustion engine exhaust in which each individual pulsation is divided into two parts and the two parts caused to oppose one another with resultant canceling out of each other and consequent substantial elimination of noise.

Another object of the invention is to provide a muffler for the exhaust gases of an internal combustion engine characterized by small size, simple construction, and having passages for the exhaust gases so arranged as to cause a minimum of back pressure on the engine exhaust system.

With the foregoing objects in view, together with such adidtional objects and advantages as may subsequently appear, the invention resides in the parts, and in the construction, combination and arrangement of parts described, by way of example, in the following specification of a presently preferred embodiment of the invention, reference being had to the accompanying drawings which form a part of said specification and in which drawings:

FIG. 1 is a side elevational view of the muffler embodying the invention as viewed in the direction of the entrance of gases into the inlet port or pipe of the mufiier.

FIG. 2 is an end elevational view as viewed from the right hand or exhaust end of a muffier, having reference to FIG. 1,

FIG. 3 is a top plan view of the muffler shown in FIG. 1 and having reference to the position of the mufiier shown in FIG. 1,

FIG. 4 is a medial sectional view taken on the line 44 of FIG. 2,

FIGS. 5 and 6 are, respectively, medial sectional and transverse sectional views taken on the lines 55 and 66 of FIG. 1, and

FIG. 7 is a perspective, fragmentary view of the end of the exhaust or discharge pipe of the mufiler which is concealed within the mufiler body.

Referring to the drawings, the illustrated embodiment of the invention comprises a body 1 having a cylindrical portion 2 preferably of greater diameter than length and having a flat end plate 3 closing one end thereof and a frusto-conical end portion 4 of approximately the same axial length as the cylindrical portion 2 closing the other end thereof. Any desired and convenient form of manufacture of the body may be employed. The cylindrical portion 2, end plate 3 and frusto-conical portion 4 may first be formed separately and welded together or the cylindrical portion 2 may be formed integrally with either of the other portions and then united to the remaining portion by a single line of welding as may be most expedient. Still further, one-half of the cylindrical portion 2 may be formed integrally with the frusto-conical portion 4 and the other half with the end plate 3 with the meeting edges thereof each cut away to form an entrance for the inlet pipe 5.

The inlet pipe 5 projects from the muffler body and is attachable to the pipe carrying the engine exhaust and the pipe 5 enters and is welded to the side of the cylindrical portion 2 with the side of said pipe removed from the axial center line of the mufiler body disposed substantially tangentially thereto. An exhaust pipe 6 extends in the said axial line through the end plate 3 to which it is welded and has the inner and thereof cut away at opposite sides as at 7, 7 to form oppositely disposed side openings separated by oppositely disposed tongues 8, 8 which are welded to the inner face of the end portion 5 at the smaller end thereof.

The exhaust gases entering the mufiler body through the tangentially disposed inlet pipe 5 are caused to move circularly about the interior of the body and at increasing rotational speeds as they travel along the decreasing diameter of the frusto-conical end portion 4. This increasing speed of rotation serves in part to cause the successive pulsations of the exhaust to damp or cancel each other out since they are not in synchronism. Finally, each such pulsation must enter the exhaust pipe 6 at the opposed openings'therein and the result is that since they are equal both in-timing and in the force exerted, they cancel each other out resulting in a substantially noiseless exhaust. It is to be particularly noted that the muffler contains no baflle means or other obstruction to the free flow of the exhaust gases through the device. Therefore, assuming a muflier having pipes at least equal in size to the pipe leading from the engine exhaust to which the mufller is attached, the back pressure produced by the mufilenper se, is reduced to a minimum.

While in the foregoing specification, there has been disclosed a presently preferred embodiment of the invention, the invention is not to be deemed to be limited to the precise details of construction thus disclosed by way of example, and it will be understood that the invention includes as well all such changes and modifications in the parts, and in the construction, combination and arrangement of parts as shall come within the purview of the appended claims.

I claim:

1. A muffier device for the exhaust of an internal combustion engine comprising a hollow, cylindrical body having a circular side wall,

a first end wall comprising a fiat plate at one end of said side wall, and a frusto-conical portion closing the opposite end of said side Wall,

an inlet pipe extending through said side wall disposed substantially tangentially thereto operative to conduct received exhaust gases into said body,

and an exhaust pipe extending through said first named end wall in the axial line of said body operative to conduct exhaust gases from said body;

said exhaust pipe within said body being attached to the inner face of said frusto-conical portion and having a pair of laterally opposite side openings adjacent to said frusto-conical portion through which the exhaust gases enter said exhaust pipe.

2. A muflier device as claimed in claim 1 in which said side wall through which said exhaust pipe extends is References Cited in the file of this patent UNITED STATES PATENTS Buckwalter Sept. 18, Chipley Sept. 7, Will-as July 19, Johnston May 22, Chipley Apr. 12,


Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1240415 *Jun 24, 1916Sep 18, 1917Tracy V BuckwalterExhaust-muffler.
US2329101 *Jun 8, 1940Sep 7, 1943Burgess Battery CoApparatus for silencing pulsating gas streams and separating particles therefrom
US2476470 *Oct 22, 1948Jul 19, 1949Willas Albert LMuffler with plural expansion chambers
US2554032 *Mar 31, 1949May 22, 1951John R Anthony JrSilencer with toroidal expansion chambers
US2706012 *Mar 7, 1952Apr 12, 1955Burgess Manning CompanySpark arresting manifold snubber
FR1198277A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3340958 *Mar 22, 1966Sep 12, 1967Cone Muffler Dev Co LtdMuffler for internal-combustion engine
US3530953 *Jul 19, 1968Sep 29, 1970Patrick J ConlinMuffler with tangential inlet and outlet nipples
US6892853 *May 1, 2003May 17, 2005Agency For Science Technology And ResearchHigh performance muffler
US7052247 *May 6, 2003May 30, 2006Samsung Gwangju Electronics Co., Ltd.Suction muffler for compressors, compressor with the suction muffler, and apparatus having refrigerant circulation circuit including the compressor
US7681690 *Jul 8, 2008Mar 23, 2010Longyear Tm, Inc.Noise abatement device for a pneumatic tool
US7735603 *May 28, 2008Jun 15, 2010Longyear Tm, Inc.Noise reducing device for a pneumatic tool
US7845464Mar 10, 2010Dec 7, 2010Longyear Tm, Inc.Noise abatement device for a pneumatic tool
US8215449Dec 2, 2009Jul 10, 2012Longyear Tm, Inc.Muffler system for noise abatement and ice control
US20040179955 *May 6, 2003Sep 16, 2004Samsung Gwang Ju Electronics Co.,Ltd.Suction muffler for compressors, compressor with the suction muffler, and apparatus having refrigerant circulation circuit including the compressor
US20040216951 *May 1, 2003Nov 4, 2004Chao CaiHigh performance muffler
US20090090530 *Jul 8, 2008Apr 9, 2009Longyear Tm, Inc.Noise abatement device for a pneumatic tool
US20090294211 *May 28, 2008Dec 3, 2009Longyear Tm, Inc.Noise reducing device for a pneumatic tool
US20100155174 *Mar 10, 2010Jun 24, 2010Longyear Tm, Inc.Noise abatement device for a pneumatic tool
US20110126541 *Dec 2, 2009Jun 2, 2011Longyear Tm, Inc.Muffler system for noise abatement and ice control
EP2167282A4 *Jul 14, 2008Jul 29, 2015Longyear Tm IncNoise abatement device for a pneumatic tool
WO2009012228A2Jul 14, 2008Jan 22, 2009Longyear Tm. Inc.Noise abatement device for a pneumatic tool
U.S. Classification181/274
International ClassificationF01N1/08
Cooperative ClassificationF01N1/087
European ClassificationF01N1/08H2