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Патент USA US2132425

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oct. 11, 193s.
G. P. LIST
2,132,425
MUFFLER
Filed June 22, 1936
_
l NVENTOR
BY
GEORGE P. L/sT
í
ATTORNEY
2,132,425
Patented Oct. 11, 1938
UNITED STATES PATENT OFFICE
2,132,425
MUFFLER
George P. List, South Seattle, Wash.
Application June 22, 1936, Serial No. 86,1487
(Cl. 181-46)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. _757)
duit I5 and expanded conduit .I6 close to the
This invention relates to a mufiler, and has for
Il.
an object to provide an improved light weight conduit
The mufller I0, including the foregoing de
and inexpensive mui‘ller of very simple construc
scribed pipes and conduits, is preferably formed
tion and high etiiciency, for use in connection by pressing the same out of metal in two comple- 5
5 with internal combustion engines, particularly on _
mentary sections 2| and 22. Flanges 23 and 24
vtehicles such as boats, aircraft, land vehicles, extending around the ends of sections 2| and_22
e c.
A further object of this invention is to provide and Webs 25 and 26, extending between the
a muflller occupyinga minimum of space and pressed out portions which form the conduits
and pipe sections, provide a suitable means for 10
lo providing a maximum of eiliciency.
securing the sections 2| and 22 together in any
A still further object of this invention is to suitable
manner, preferably by welding, it being
provide a muiller which is made of two parts
understood,
however, that any suitable clamping
suitably fastened together, the two parts being
means may be substituted instead for securing
substantially identical, and being made of suit
the webs and flanges together and holding the 15
15 able metal such as brass, steel, aluminum, or
muiller in assembled position.
other fabricated metal.
This muffler IIJ depends for its effectiveness
l As a further object of this invention, the muiller
of this invention conducts the exhaust gases in upon the fact that a straight line is the shortest
a direction continuously away from the entrance, distance between two points. The exhaust gases
entering through pipe II are divided as a result 20
20 and at the same time spreads out the exhaust
of the taper I5 so that part of them follow the
impulses to such an extent that they flow stead
ily out of the mufller well below the velocity of semi-circular passages Il and I8, I9 and 20,
sound and with a complete absence of drumming. while a portion goes through the smaller conduit
With the foregoing and other objects in view, Il. That portion going through the smaller con
duit I4 arrives at the expanding conduit I6 before u
as will hereinafter become- apparent, this in
the portions of the exhaust gasses flowing
vention comprises- the constructions, combina
through
‘the concentric conduits. Further, due to
tions and arrangements of parts hereinafter the Venturi
effect of the tapered conduit I5 and
claimed, disclosed and illustrated, wherein,
Fig. 1 is an inside plan view of one of the the curvature of the concentric conduits, the
exhaust gases will be traveling at different speeds 30
30 muiller sections of this invention;
as
they reunite at the expanded conduit I6 to
Fig. 2 is a complete sectional view on line
enter the muffler outlet pipe I3.
2-2 of Fig. 1; and
will be obvious, the exhaust impulses will
Fig. 3 is a complete sectional view on line beAs
thus spread out, for in reunitlng the portion
3--3 of Fig. 1.
A
of the gas traveling through the conduit Il will 35
There is shown at III the muiller of this in
arrive at the expanded pipe I6 more quickly than
vention, which includes an exhaust pipe II lead
that portion going through the concentric pipes
ing to the muffler body I2 andnt'hrough the body
I2 to the exhaust outlet pipe I3. As will be ap
parent from the drawing, the inlet and outlet
pipes are substantially identical and hence inter
changeable, so that the muiller may be connected
up at either end.
Extending through the muiiler body I2 from
the pipe II and pipe I3 is a conduit I4, which
is of a lesser diameter than the diameters of the
pipes II and I3. Leading to the conduit I4 from
the pipe II is a tapering conduit I5, and leading
from the pipe I4 and pipe I3 is an expanding
conduit I6. Semi-circular conduits I1 and I8, of
50 a diameter substantially equal to that of the con
duit I4, connect the entrance of the tapered con
duit I5 to the exit of the expanded conduit I6.
Concentric with the semi-circular conduits I1
and I8 is another pair of semi-circular conduits
ï I9 and 20, which connect with the tapered con
I9 and 20, and, similarly, these reunited portions
will arrive more quickly at the end of the ex
panded pipe I6 than those portions traveling ¿o
through the outer concentric pipes I1 and I8.
The exhaust impulses will thus be spread out
and broken up to such an extent that they will
flow smoothly and steadily out of the muffler Ill
at I3 below the velocity of sound and with a ¿5
complete absence of drumming, thus providing
an eiiicient, light-weight and'inexpensíve muf
fler.
.
The invention described herein may be manu
factured and used by or for the Government of w
the United States of America for governmental
purposes without the payment of any royalties
thereon or therefor.
I claim:
1. A muiller comprising an entrance pipe, an
2
2,132,425
exhaust pipe, and a plurality of conduits con
necting said entrance pipe to said exhaust pipe,
said conduits being of lesser diameter than said
entrance pipe, some of said connecting conduits
being longer than the others of said connecting
conduits, and a short, substantially straight con
duit leading from said inlet pipe at one side to
said outlet pipe at the opposite'side, a tapering
conduit connecting said inlet pipe to said straight
10 conduit and an expanding conduit connecting
said straight pipe to said outlet pipe, said longer
conduits being semi-circular and leading from
said tapering conduit to said expanding conduit.
2. A muiller comprising an inlet pipe, a muilier
15 body and an outlet pipe at the opposite side of
said muiller body from said inlet pipe, said muf
fier body including a plurality ofconduits of a
diameter smaller than the diameter of said inlet
pipe, one of said conduits in said muiller body
20 extending in a substantially straight line from
said inlet pipe to said outlet pipe, a tapering
conduit connecting said inlet pipe to said straight
conduit, and an expanding conduit connecting
said straight conduit to said outlet pipe.
25
3. A muffler comprising an inlet pipe, a muñier
body and an outlet pipe at the opposite side of
said muiller body from said inlet pipe, said muf
fler body including a plurality of conduits of a
diameter smaller than the diameter of said inlet
30 pipe, oneof said conduits in said muiìler body
extending ina substantially straight line from
said inlet pipe to said outlet pipe, a tapering con
duit connecting said inlet pipe to said straight
conduit, an expanding conduit connecting said
35 straight conduit to said outlet pipe, and a plural
ity of concentric conduits connecting said taper
ing conduit to said expanding conduit.
4. A muñler comprising an inlet pipe, a muiiier
body and an ~outlet pipe at the opposite side of
said muffler body from said inlet pipe, said muf
ñer body including a plurality of conduits of a
diameter smaller than the diameter of said inlet 5
pipe, one of said conduits in said muñier body
extending in a substantially straight line from
said inletY pipe to said outlet pipe, a tapering
conduit connecting said inlet pipe to said straight
conduit, an expanding conduit connecting said 10
straight conduit to said outlet pipe, and a plural
ity of concentric conduits connecting said taper
ing conduit to said expanding conduit, said con
centric conduits being in the same plane, and
said outlet pipe being of a diameter substantially
equal to the diameter of said inlet pipe, whereby
the exhaust impulses entering said muiller
through said inlet body are spread out into said
conduits and reunited in a steady flow into said
outlet pipe.
20
5. A muiller body consisting of a number of
complementary pressed metal sections, each
pressed metal section comprising a plurality of
semi-cylindrical conduits and a plurality of webs
integrally connecting said semi-cylindrical con
25
duits into a single section.
6. In a muiller body, a pressed metal section
comprising a plurality of semi-cylindrical con
duits, a portion of each conduit being spaced
apart from a portion of each other conduit and 30
a web integrally connecting each spaced apart
portion of each conduit to that of the adjoining
conduit.
GEORGE P. LIST.
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