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Publication numberUS1065707 A
Publication typeGrant
Publication dateJun 24, 1913
Filing dateAug 7, 1912
Publication numberUS 1065707 A, US 1065707A, US-A-1065707, US1065707 A, US1065707A
InventorsNicholas W Montgomery
Original AssigneeNicholas W Montgomery
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Under-water exhaust for explosive and other engines.
US 1065707 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)



Patented June 24, 1913 Wain 0w 1s 0s I 1100: M 01:

6? ll 107a) as W #7024 (901110111;




To all whom it may concern:

Be it known that I, NICHOLAS W. MONT- coarser, a citizen of the United States, and a resident of Gloucester, in the county of IIssex and State of Massachusetts, have invented an Improvement in Under-Water Exhausts for Explosive and otherEngines, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawing representing like parts.

This invention relates to exhausts for explosive and other engines, and is particularly adapted for use as .an under-water exhaust for explosive engines employed in motor boats.

In orderthat the principle of the invention may be readily understood, I'have disclosed a singleembodiment thereofin the accompanying drawing, wherein Figure 1 is a vertical View partially in side elevation and partially in-vertical'section of one embodiment or form of the invcntion; Fig. 2 is an underneath plan of the shall describe the invention with special refcrence to such use, it is to be understood that it is in no respect limited thereto, but so far as certain features thereof are concerned, it is of general application.

Owing to the noise made by the exhausts ofsmotor boats, the exhausts have been submerged, but, so far as I am aware, with the invariable result of decreasing the speed of the boat. The exhaust herein disclosed not only does not decrease thespeed of the boat, but it does away with all noise of exhaust, all odor, vibration. excepting that of the engine, and pounding upon the bottom of the boat. I have been enabled, by employing the submerged exhaust herein disclosed, to drive the boat at a greater speed than when employing an open exhaust, without mufiling.

v Specification of Letters Patent. Ia1;eifl;ed June 24, 1913. Application filed August 7, 1912. Serial No. 713,703. 7

Referring more particularly to the drawing, I have therein represented an exhaust chamber 1 of any suitable shape and construction whereinto the exhaust motive agent from the engine is admitted through the pipe 2. Herein I have represented the pipe 2 as opening into the forward end of the exhaust chamber 1. While the size of the chamber 1 may 'be largely varied within the scope of my invention, I have obtained excellent results by making it of such size that its capacity is substantially six times the capacity of the compression chamber of the gasolene or other explosive'engine with which I preferably employ it.

At a suitable point with relation .to the pipe 2, I provide a battle late 3 herein represented as extending fr m the lower portion of the forward end 5 of the exhaust Y chamber 1 in an upward and rearward direct'ion to a point 6 adjacent the top of said exhaust chamber. The said baflle plate may be formed with the walls of the chamber or suitablv attached thereto. The bafile plate 3 terminates below the top of the chamber 1 to permit the passage of the burnt gases or other motive a cut thereover and into the main portion 7 0 said chamber. At a suitable point and preferably in advanceof the bafllc plate 3 I provide a 'pipe, 8 for discharging a suitable fluid into the chamber 1 to reduce the temperature of the exhaust motive agent and partially, at least, to stop the expansion thereof. Preferably for this purpose I introduce the overflow or waste from the circulating water of the engine employed to cool the latter. discharged under pressure into the exhaust chamber 1 at any desired temperature and is there brought into intimate contact with theexhaust motive agent.

To efiect this result most eliiciently, preferably I spray the water, and for that purpose have herein rep resented a projection or shelf 9 extending rearwardly a substantial distance from the head 1 of the exhaust chamber and there terminating in an upwardly extended lip 10 provided with a series of perforations 11, wherethrough the water is sprayed toward and preferably against the ballle plate 3 and into intimate association with the exhaust passage.

The result of the introduction of the Water in the manner described and its intimate This water is association with the exhaust motive agent is materially to reduce thevtemperature of the latter and to stop the expansion of said agent or largely to reduce the expansion thereof. The result of this action is such that there is no pressure within the chamier 1.

In order to secure the best results, the exhaust motive agent is discharged from the chamber 1 at a point substantially adjacent its point of admission thereinto, thus compelling the circulation of said agent about the chamber, as indicated by arrows in Fig. 1. In said figure, I have represented the discharge pipe 12 as communicating with the bottom of the exhaust chamber l at a point 13 close to the head 5 of said chamber and beneath the lower end of the baffle plate 3. Thus, the commingled exhaust motive agent and spra water or vapor are effectively circulate and eventually discharged as described.

The discharge is effected through some suitable part of the hull, and. preferably through the bottom thereof. In Fig. 1, l have representeda portion of the bottom of the hull at 14 and have represented the pi e 12 as extendin downwardly to the hull-and there provided with a discharge shoe 15, herein represented as extendin ward inclination through the ull and into the water. The shoe 15 is constructed as a short section of pi e having a discharge end .16 and a flange 1 by which itmay b cured by screws 18 or otherwise to the bottom of the hull. The boat when moving forwardly moves in the direction of the 'arrow adjacent Fig. 1,that is, toward the right viewing said figure. fore, be observed that'the-submerged portion of the shoe is of a general wedge shape, the heel of the wedge being at the rear, and preferably provided with a downwardly extending lip 19.

, When the boat is moving forwardly, the inclined face 20 of said shoe 15 forces the -water downwardly ,or away from said surface and it at once rises at the opposite sides 55, haust motive agent discharged through the outlet 16 of the shoe is discharged directly into this pocket, and Ihave discovered that all noise" of exhaust is eliminated, and that the speed of the boat is not reduced. I attribute this result to the formation of a partial vacuum or of a chamber or pocket in the water, whereinto air from the water enters, so that the exhaust motive agent is not discharged directly into the water but into an air pocket or partial vacuum. The result at a down'-- It will, therei in any case is to eliminate all noise of the exhaust and to drive the boat at a speed which is equal-to or greater than that obtained from an open exhaust without a muffler.

It will be observed that the shoe 15 extends, preferably, but a slight distance below the bottom of the boat, and hence there is little or no danger that it will come in contact with rocks or other obstructions. The lip 19, which I term a bubble rim, materially assists in causing the formation of the ocket. T e lip 19 constitutes an agitating proection which serves to facilitate the separation of air from the waterby causing the formation of air bubbles. This separated air immediately passes into the pocket formed by the shoe 15 and thus aids in sup plying air to the said pocket. The air thus received in said pocket assists in mufiiing the exhaustand materially reduces the noise thereof. The maximum efiicienc'y of the lip is secured by forming it 'upon the inclined face 20 closely adjacent the discharge end 16. The submerged or finder-water exhaust operates to best advantage when the engine is on the direct, but will operate satisfactorily on the reverse, but the engine will be sloweddown, because no pocket is formed.

where the discharge pipe 12 connected directlyto the rear end of the chamber 1, particularly if the bafiie plate 3 were not employed.

The exhaust chamber 1 is represented as inside the hull, and preferably itis located back of the engine. The shoe 15. may and preferably does terminate at a point close to the hull, but within the scope of my invention may be extended downwardly or laterally toany desired len h. I

Although Ihave obtaine the best results by spraying the water introduced through the pipe 8, it is not. essential that this be done. In the event that I employ my invention in connection with a steam engine, I preferably do not introduce any fluid through the pipe 8, but 'omit such feature of the invention.

'1 do not in this application claim the chamber 1 nor those features of the invention immediately co-acting therewith.

Having thus described one illustrative embodiment of my invention, I desire it to be understood that although specific terms are employed, they are used in a generic and descriptive sense and not for purposes of limitation, the scope of the invention being set forth in the following claims.

1. An under-water exhaust for explosive or other engines comprising a shoe adapted By connecting the discharge pipe 12 at a;

to project through the submerged portion of a boats hull, said shoe comprising a pipe section having a rearwardly and downwardly inclined wall 20 terminating in an open discharge end 1% and having a downwardly directed lip 19 projecting angularly from the said inclined wall.

2. An under-water exhaust for explosive or other engines comprising a shoe adapted to project through the submerged portion of a boats hull, said shoe comprising a pipe section having a rearwardly and downwardly inclined, imperforate, deflecting wall 20 terminating in anopen discharge end 1.6 and having a terminal lip 19 extending substantially normal tQsaid'Wall.

3. An under-water exhaust for explosive or other engines comprising a sboe adapted to protrude through the submerged portion of a ships hull, the protruding portion of said shoe consisting of a downwardly and rearwardly inclined wall 20 terminating in a downwardly directed angular lip 19, and upright, substantially parallel side walls 21, 22 terminating forwardly in the plane of the face of said inclined wall, thereby permitting immediate upward discharge of the water at the lateral edges of the wall. 20.

4. An under-water exhaust for explosive or other engines comprising a shoe adapted to project through the submerged portion a rearwardly and downwardly directed discharge outlet, and a water agitating lip projecting from said inclinedsurface closely adjacent the said discharge end.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2484816 *May 28, 1947Oct 18, 1949Fred J CulbertLiquid cooled muffler with plural expansion chambers
US2940300 *Jun 7, 1956Jun 14, 1960Du PontSound reducing explosives testing facility
US3111190 *Jan 3, 1961Nov 19, 1963Hubert S VaughnMarine engine muffler
US4713029 *Feb 17, 1987Dec 15, 1987Vernay Laboratories, Inc.Inverted flow marine engine exhaust muffler
US4744778 *Jul 21, 1986May 17, 1988Thunderbird Products CorporationMarine engine exhaust muffler with swim platform
US4786265 *May 4, 1987Nov 22, 1988Thunderbird Products CorporationMarine engine exhaust muffler
US5259797 *Sep 11, 1992Nov 9, 1993Marine Muffler CorporationMarine engine exhaust system and method
US5616893 *Jun 7, 1995Apr 1, 1997Woods; Woodrow E.Reverse entry muffler with surge suppression feature
US6273772Jul 8, 1999Aug 14, 2001Smullin CorporationApparatus and method for multi-conduit waterlift engine silencing
US6591939Apr 27, 2001Jul 15, 2003Smullin CorporationMarine engine silencer
US7361282Jul 21, 2003Apr 22, 2008Smullin CorporationSeparator of floating components
EP2101048A1 *Mar 12, 2008Sep 16, 2009Robert Bosch GmbHAn exhaust gas duct component
U.S. Classification181/235, 440/89.00J, 440/89.00R
Cooperative ClassificationF01N13/12