US956906A - Muffler. - Google Patents

Description

E. D. SIZER.

MUFFLER.

APPLICATION FILED JAN. 24, 1910.

Patented May 3, 1910.

2 sums-sum 1.

Fig. 5.

E. D. SIZER.

MUFFLER.

APPLICATION FILED .TAN.Z4, 1910.

WIIIIIIII/IIW WWW Patented May 3, 1910.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

EDWARD D. SIZEBQDF SIZERVILLE, PENNSYLVANIA.

MUFFLER.

Tocllwhom it'may concern:

Be it known that I, EDWARD '1). Sizes, a citizen of the United States, residing at Sizerville, in the county of Cameron and State of *lennsylvania, have invented certain new and useful Improvements in Muf- .flers, of which the follow'ing is a specification.

This invention relates to improvements *in muiflers and although its various forms are "readily applicable to any devices in which sound silencers 'or mufliers are desirable, it is more especially designed for use in connection with-internal combustion and steam engines.

Among the objections well known to exist in the mufilers now in use, is the tendency to create a back pressure by retarding the free exit-of *the products of combustion from the engine exhaust and consequently decreasing the efficiency of the engine at the expense of decreasing the noise of operation of the same. Adevice is now constructed upon an entirely new principle which while acting as -a completes'ilencer reduces the back pressure upon the motor to a minimum. The prin- 'ciple relied upon is the path-of travel given to the exhaust fluid-and this assumes what may be termed a compound helix or coil; in

throughout the length of-the muflier.

other words, if a wire helical spring was -wound about a cylinder of uniform diameter, the wire composing the spring would assume "from one end to the other a line which would represent the general course re- 5 quired'to be traveled by the exhaust fluid in passing through my device. The revision also is made of an opening of uni orm size at the axis of tubular coils, which make up the mufiler body proper, and which opening- =allows tree entrance to the interior of the; coil at all points of the axis thereof andi The device disclosed is also exceedinglyi simple and is easy and cheap to 'manufac-i tu reyand -as this eculiar form afi'ords a perfeet operation w en constructed of a comparatively small size and further being of; extremely light weight, its value and applicability :to aeroplane work will be evident.

My device is also built up of semi-circular sections so that the entire length of the muf- I dler'may'ibe regulated as desired for the particular-use to which it is to be employed.

With these general objects in View and :others :that will appear as the nature of the invention is better understood, my invention Specification of Letters intent. Application Hilefllanuary 24,:1910. :Serial m. 539.737.

Batented May 3, 1919.

consists in the novel construction, combination and arrangement of parts as will be hereinafter fully described, illustrated in'the accompanying drawings and pointed out in the claims.

In the drawings forming -a part of this application like designating iiiumerals represent similar parts throughout the several views and in which:

Figure 1 is a longitudinal sectional "view of the device showing the half coils :in position, Fig. 2 is an inside view of the outlet end'or cap, F i '3 is an exteriorelevation of the inlet-end othe-muffler, 4 shows two sheet metal sections assembled, Fig. 5 is two .views of a cast metal section, Fig. 6 shows two cast metal sections assembled, 7 shows a modified form of joining two cast metal sections together, 'Fig. 8 is a plan .view of the assembled sections, and, Fig.9 shows a modified form of arranging the sections within the casing.

:Referring more specifically to the drawwhich at one end is provided with a cap closure 11 having a central screw-threaded perforation 12 for the reception of 'thetexternally screw-threaded end '13 of the enine exhaust pipe, said closure having a angeflet slipping over and screw threaded to the end of the casing 10. Acon'ical nozzle 15 is provided at the opposite or outlet end of the casing, 'the same having a flange 16, corresponding to the flange let-oi the closure cap '11, and which fits 'over and is screwthreaded to the end of said casing. This outlet nozzle 15 is provided at its larger and inner end with an annular inner shoulder 17, designed for a purpose hereinaifitcr fully set forth, while at its outer end the same is screw-threaded as at 18, to accommodate a lead-oil pipe.

Accommodated within the cylindrical casing 10 is a continuous hollow coil, pretera'bly formed of metal, and closely fitting the same for its entire length. The outer periphery of this coil for its entire length contacts the inner periphery 'of the casing, while the end convolutions of the 43011 are seated respectively upon 111820105111 3 cap 11 vand the shoulders 17 of the nozzle 15..

'The essential elements of -my invention are 'the peculiar construction of this poll and the improved advantages and fHIIGCIODS lG- I and engage the outside surface of the end-- rived thereby. Although this isso, the formation of a single section 40 of the coil which is herein represented as forming but a half of a sin 1e convolution of the coil, is of the essentia essence of the invention.

A single section is shown in' Fig. 5 and as there shown is constructed of cast iron or metal of an appreciable thickness. The formation is what might be termed tubular and bent in the form of a semi-circle as shown at theleft of the view, while at thev inner edge or smaller diameter of the circle the same is slitted circumferentially, one edge 19 being contracted and extending partly over although in regular spaced relation from the opposite edge 20 thereof.

Such a construction produces a form that in cross-section from the center to the circumference would roughly represent a figure 6, it being noted that one end of each coil is given a torsional sidewise impulse substantially equal in distance to one-half of the diameter of the coil interior and permanently retaining such position, enables the section to assume a portion ofthe composite .coil body. As constructed of cast metal, the

sections are assembled together with abutting edges as shown'in Fig. 6,.and are provided with projecting lugs 21, upon one end onlyof each section, and which lugs fit over portion of the contiguous section. In viewing Fig. 5, it will be noted that one section is shown and two views thereof, while Fig.

6 shows two sections properly assembled edge is designated 24. The use of both of' said joints will rovide an assembla e of sections that will insure a perfectly uniform bore or. open passage-way 25 through the entire composite coil and from one end to the other of the muffler.

In Fig. 4 the sections are formed of sheet metal, preferably sheet steel, and being of unappreciable thickness, the contiguous ends I of the sections when assembled, are made to telescope one with the other, by crowdin the ends of the one within the contiguous en of the other, as will be evident from said view, and to provide such outer and inner lapping each section is slightly greater than a true semi-circle, being provided at each end with a lapping portion. In this construction each lapping portion is provided with one or more perforations 26 for receiving the rivets 27 to hold the sections properly assembled together. In both Figs. 4 .and 6 a complete convolution of the composite coil structure is shown and in each the respective superposed or outer end which is disengaged is represented by the letter X, while in each of said views the corresponding underend of the other-section or in other words, the free and disengaged end of the other section, which is farther away from the point of vision, is noted by the letter Y.

From this it will be seen that the contiguous and contracted edge 19 of the assembled sections 'forms a spiral ed e extending substantially from end to en of the casing 10 and forming a central, continuous, unobstructed bore or passage-way therethrough of a diameter slightly less than the-inner diameter of the inlet exhaust pipe 13, as best shown in Fig. 1. Outside thereof, the adjacent edges 20 also form a continuous spiral edge from one end to the other of the casing and between said edges 19 and 20 is provided the spiral slot 28. a It will be evident that any products of combustion received through the pipe 13 and entering the coil spaces 25 will receive a helical impulse and will continue in the spiral path until they are finally exhausted through the nozzle 15. The provision also of the bore 19 is of less diameter than the inlet 13 whilethe bore 20 is greater than the same, the exhaust fluid will be free to enter the spiral passage 25 by passing under the spiral edge 19 at any point thereof. A portion of the fluid, all of which enters in pulsations, will be caught under the edge 19,, almost immediately at its entrance within the casing, while other portions of such fluid may pass farther through or nearly completely through thesame before they are received under the edge 19 and within the passage 25. The fluid turns into the passage 25 by the edge 19 as shown by the arrows in Fig. 1, is given a rotary motion therein as also shown by said arrows, while the forward pressure of the repeated,impulses, insures a continual spiral forward motion within the said passage, both motions being represented by the arrows in Fig. 4.

The end convolutions 29 and 30 are cutaway as shown in Fig. 1 to allow the section 29 to seat itself upon'the end plate 1 1 and to provide a similar seating of the coil 30 upon the annular seat 17 of the nozzle.

To secure the sections within the casing, and also to' provide for the locking of the end members upon their screw-threads, the aperture 31 is provided through the flange 16 and also through the flange 14 and the holdfast devices 32 are provided therethrough and fittin through the casing and into the end convo utions 30 and 29.

6o prising a spiral casing, said casing pro- The exit nozzle 15 may be slightly modified-in form as shown in Fig. 9 as 35 and in this structure it will be noted that the .annular shoulder 17 is dispensed with while the end coil 30 seats itself upon the adjacent inner face of said nozzle as at 33, and the form of the remaining features may be substantially identical except that said coil 30 will be suitably cut-away as at36 to'facilitate the egress of the combustion fluids. In lieu of the end cap 11 a nozzle 37 Y may be employed at the inlet end of the muifler,

WhlCl'l nozzle is shown in Fig. 9 as identical in form with the outlet nozzle of the device. while the end coil 29 fitting therein is broken away to accommodate its entrance in the nozzle and the reception of the initial entranceof the ases therein. Said nozzle 37 is provided wlth ascrew-threaded opening 39 for the "reception of the end of the said pipe 13.

It will be noted that in the plan view of the assembled sections shownin' Fig. 8 that the relative arrangement 'of such sections is clearlybrought out. together with the meeting edges 38 between the adjacent sections, in this instance the sections being joined tofither-by the form of joint shown in Fig. 7.. oreover in said view '8 is more clearly brought 'outthe edges 19 and 20 shown in dotted lines and which by the assemblage of the several sections are co-extensive with the united length of the sections, as shown in dotted lines. Moreover the spiral slot 28- claimed.

formed between said edges is also clearly seen.

Although the forms of my invention'herein shown and described are believed to be what are preferably embodiments thereof, it is nevertheless to be understood, that minor changes may be made in the form, size, and

arrangement and proportion of parts, which however, will not depart from the spirit and scope of my invention as herein specifically 'Having thus fully described my inventionand inwhat manner the sameis de- States isi signedfor use, what I claim and desire to secure by Letters Patent of the United 1. A device of the class described comprising a spiral casing and said casing having a spiral slot co-extensive' with the length'of said casing. y

2. A device- 1of I the ciassgdescribed lcoinrisin a s ira casin aving a s ira s 0t o-ext nsivd with the Iength'of casing, and said casing formed ofseparable sec-' tions. 7

3. A device of the classdescribedcom vided with a spiral slot co-extensive with the length of said casing, said casing formed I I convolution of a coil.

a spiral slot cosextensive with the length of a said casing, said passage formed of separable sections, each of said sections having its greatest dimension semi-circular, and the cross-section of a said section being in the form of a figure 6, said sections provided within a cylindrical casing, and a conical nozzle upon one end thereof and a closure cap upon the other.

6. A muffler comprlsing a plurality of semi-circular sections, said sections being tubular and adapted to form a continuous spiral passage when a plurality of said sections are assembled.

7. A muflier comprising a plurality of semi-circular sections, said sections having a continuous spiral bore therethrough provided with a continuous spiral slot entering said spiral bore and of equal length therewith." i

8. In combination with the exhaust pipe of an engineya 'mufiier, and means for imparting both spiral and rotary movement therethrough.

9. 'In a mufiier section, a substantially semi-circular unit, one side thereof provided with a slot and extending lugs provided on oneend thereof.

10. In a mufiier, a cylindrical casing, .a

head secured to one end of said casing, a

nozzle secured to the opposite end of said casing, a plurality of semi-circular sections provided within said casing and furnishing a .continuous spiral passage thereth'rough, said sections rovided with a continuous spiral slot, "an hold-fast means for securmg the head and nozzle upon said cylinde and the sections therewithin.

11. In. a separable section for a mufller, a metallic member of substantially semi-circular dimensions and adapted to telescope :witha similar section to form one complete.

In testimon whereof I afiixmy n presence 0 two witnesses.

- Witnessesr g HAROLD M. 'WAnnmeioN, R ms PB W- signature -.EDWARD D. sIZER.

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