Improvements in Means for Suppressing the Noise of the Exhaust from Internal Combustion Engines
Year: 1896

page_text: Date of Application, 30th Nov., 1896
Complete Specification Left, 30th Aug., 1897-Accepted, 6th Nov., 1897
PROVISIONAL SPECIFICATION.
Improvements in Means for Suppressing the Noise of the Exhaust
from Internal Combustion Engines,
I EDWARD JOEL PENNINGTON, of the City and County of Racine State of
Wisconsin, United States of America, Gentleman, do hereby declare the nature
of this invention to be as follows:-
This invention relates to a muffler or exhaust box, for deadening the noise
caused by the exhausting of the products of combustion from internal combustion
engines, in which chambers provided with asbestos or the like partitions are
employed.
The said muffler may be formed of light sheet brass with elbow shaped walls
and contain sleeve shaped partitions, the first, forming the chamber into which
the exhaust first enters, preferably encloses a larger space than the entire space
contained in the engine cylinder in order to avoid back pressure. Near the end
of the first chamber an asbestos partition is provided which together with the
chambers enclosed by the other sleeve shaped partitions and the asbestos par-
titions they enclose, effect the suppression of the noise.
Dated this 30th day of November 180c
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in Means for Suppressing the Noise of the Exhaust
from Internal Combustion Engines.
I, EDWARD JOEL PENNINGTON of the City and County of Racine, State of
Wisconsin, United States of America, Gentleman, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:--
This invention relates to a muffler or exhaust box, for deadening the noise
caused by the ejection of the gaseous products of combustion from the working
cylinders of internal combustion engines the said muffler or exhaust box compris-
ing chambers provided with partitions of asbestos or the like as hereinafter
described.
In order that my invention may be clearly understood and readily carried into
effect I will proceed to describe the same with reference to the accompanying
drawings, in which..

page_text: Figures 1 and 2 are, respectively, 3 longitudinal section, and an end elevation
of an exhaust muffler constructed according to my invention; and
Figures 3, 4 and 5 are, respectively, a longitudinal section, an end elevation
partly in section, and a plan, of a modified form of exhaust muffler adapted for
use with a two cylinder engine.
In all the figures like letters of reference indicate similar parts.
Referring to Figures 1 and 2 the muffler or exhaust-box here shown consists of
three sleeve-shaped sections or chambers a a¹ a², the two end sections being elbow
shaped, and the middle one straight. These sections or chambers may be formed
of light sheet brass, and the outer end of each section is adapted to be fitted into
the inner end of the next succeeding section, as shown. At or near the outer ends
of the sections or chambers are placed partitions b, b1, b2, of asbestos, preferably in
the form of gauze. In order to avoid any back pressure of the exhausted gases,
I so arrange these sections or chambers that the chamber a into which the
exhausted gases first enter has a greater capacity than that of the cylinder of
the engine, and each succeeding chamber has a greater capacity than that of the
chamber immediately preceding it.
The exhausted gases enter the muffler at the end a, which may be secured to
the cylinder contiguous to the exhaust port in any suitable manner, pass succes-
sively through the chambers a a¹ a and the asbestos partitions b b 2 with which
the same are provided, and issue quietly out at the mouth of the chamber a³
without noise.
Referring to Figures 3 to 5 which illustrate a modified form of my exhaust
muffler suitable for use with a two cylinder engine; a a is a tubular section of
thin sheet brass divided centrally by an asbestos partition b and having on each
side of said partition an inlet a for the exhaust. Each end of this section a is
provided with a partition of asbestos gauze b, and fits ino an elbow (shaped
section a² also provided at its end with a covering or partition 61 of asbestos
gauze. If desired, however, I may dispense with the asbestos partitions b.
The exhausted gases pass through one or other side of this muffler in the same
manner as in that described with reference to Figures 1 and 2; and the capacity
of the chamber formed in the section a on each side of the partition 6 is greater
than that of the working cylinder; and the chambers formed in the sections a¹ are
of greater capacity than the chambers in the section a.
By constructing the exhaust muffler in the manner herein before described,
the exhausted gases are caused to be deflected as they pass through the muffler,
and their passage through the partitions enclosed in the various chambers or
sections reduces their energy and thereby effects the suppression of the noise that
would otherwise arise by their direct escape into the atmosphere. At the same
time, back pressure of the exhausted gases is avoided by reason of each succeed-
ing chamber into which the gases pass being of greater capacity than the preceding
one.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
A muffler or exhaust box comprising a series of chambers of increasing capacity
separated by asbestos partitions, substantially as and for the purpose specified.
HASELTINE, LAKE, & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.