Improved Apparatus for Silencing the Exhaust in Gas or other Engines.
Year: 1896

page_text: Improved Apparatus for Silencing the Exhaust in Gas or other
Engines.
I MICHAEL HOLROYD SMITH of Albany Buildings 47 Victoria Street Westminster in
the County of Middlesex Consulting Engineer do hereby declare the nature of this
invention to be as follows:-
The object of my invention is to lessen the noise made by the exhaust from gas,
oil or similar engines.
For this purpose I connect the exhaust pipe to a chamber preferably circular and
of larger capacity than the cylinder of the engine, within the cylinder I place a cone
with its apex towards the incoming exhaust this to prevent the charge from rushing
across the chamber within the chamber I also place annular rings to baffle the rush of
spent gasses.
At some convenient place in the chamber preferably opposite to the entrance pipe
I place an exit pipe which terminates in a flange the mouth of this pipe is slightly
conical and is fitted with an adjustable cone carrying a metal plate of the same
diametre as the flange on the exit pipe. This cone and plate by suitable screw or
like device is adjustable so that it can be placed close to or removed a little distance
away from the flange. By properly adjusting the plate the speed of the escaping
gasses which have previously expanded in the chamber can be regulated as desired
and the noise considerably reduced without putting undue back pressure upon the
engine.
Dated this 14th day of November 1896
COMPLETE SPECIFICATION.
Improved Apparatus for Silencing the Exhaust in Gas or other
Engines.
I, MICHAEL HOLROYD SMITH of Albany Buildings, 47 Victoria Street, Westminster,
in the County of Middlesex, Consulting Engineer, 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:-
The object of this my Invention is to lessen the noise made by the exhaust from
Oil. Gas. or similar Engines.

page_text: The invention will be more readily understood by reference to the accompanying
drawings in which like letters represent similar parts.
Fig. 1 is a side elevation of an exhaust silencer; in section.
Fig. 2 is an end view of the escapement.
Fig. 3 is a modified form of escapement.
Figs. 4, 5 and 6 show various general arrangements.
In carrying out this invention I connect the exhaust pipe A from the engine to a
chamber B of any convenient form and size, but preferably circular, and of larger
capacity than the cylinder. At some convenient part of the chamber, preferably as
far removed as possible from the entrance, I place an exit pipe C which terminates in
a flange D. The mouth of this exit pipe is by preferance slightly conical, and is fitted
with an adjustable cone E carrying a metal plate or diaphragm F approximately of
the same diameter as the flange D. This diffusing diaphragmn is provided with small
holes G near its circumferance so that it can be readily turned for adjustment by
means of a pointed rod or spike. A back-nut H or other suitable device is provided
for locking the plate F in any position relative to the flange D. By properly
adjusting the plate the speed of the escaping gases, which have previously expanded
in the chamber can be controlled and their diffusion over a large area secured, thus
considerably reducing the noise of the exhaust, without putting undue back pressure
upon the engine.
Fig. 3 shows a simplified arrangement of escapement; the exit pipe preferably of
cast inetal is so formed that a wrought metal flange I can be concentrically attached ;
and the diaphragm K preferably of stamped or spun metal having the cone formed in
its centre can be attached to the flanged pipe by means of the studs L or other
equivalent device, short pipes or washers being intersposed as distance pieces,
these spacing pieces could be made of various thicknesses until the proper distance
was ascertained when the studs would be screwed tight and the ends slightly burred.
to prevent shaking out, or lock nuts P could be employed.
In some cases where it is not convenient to employ a chamber of sufficient capacity
the distributing cone Q and the baffle ring R as shown in Fig. 1 can with advantage
be employed.
Fig. 5 shows a convenient method of arranging the baffle plates where it will be
seen that washers S and discs T are alternately strung upon rods or bolts U, tubes or
washers or coils V being used for spacing, these same bolts may also serve to secure.
the entrance cap W and exit cap W1 carrying the flange D. By employing springs X
under the nuts of the bolts U they would act as a safety device should an explosion of,
gas occur within the silencing chamber.
Figs. 4, 5 and 6 are introduced to show that the chamber with the entrance A and
exit D may be constructed in various ways.
In Fig. 6 a casing Y.is shown surrounding. the escapement so that the gases may
be directed outside a building supposing the exhaust chamber is within. The exit
pipe C could of course be lengthened and the escapement placed outside.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
(1.) Exhaust silencers constructed substantially as illustrated and described.
(2.) In exhaust silencers the combination of an expansion chamber and escapement
substantially as illustrated and described.
(3.) In exhaust silencers a flanged orifice fitted with a conical plug and diffusing
diaphragm or plate adjustable or otherwise substantially as and for the purpose
described.
(4.) In exhaust silencers the combination of an expansion chamber with a flanged
orifice plug and diaphragm adjustable or otherwise substantially as and for the purpose
described.
'

page_text: (5.) In exhaust silencers the combination of an expansion chamber with baffle
plates, a flanged orifice, plug, and diaphragm adjustable or otherwise substantially as
and for the purpose described.