US1717033A - Thermic siphon and method of making same - Google Patents

Description

June 11, 1929. w. H. HINSCH ET rrmmuq SYPHON AND METHOD OF MAKING sum Filed Feb. 19. 1927 2 Sheets-Sheet June 11, 1929. w. H. HINSCH ET AL 1,717,033

THERHIC SYPHON AND METHOD OF KING SAME Filed Feb. 19. 1927 2 Sheets-Sheet 2 oOoOooQO oooooodoo flghfl JZ/G/ZZ EKS KWWQZ W Patented June 11 192a.

"UNITED STATES PATENT OFFICE.

WANTED H. HII'INSCIH AND- GUSTJ. CHBIS'IENSON, OI CHIGAGO,v ILIQDIOIS, .IASSIG'NO BS 1'0 LOGOHOTIVE FIREBOX COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

' THEBMIO SIPHON AND METHOD OF MAKING Application filed I'ebruary 19, 1927. Serial No. 189,608.

for increasing the water steaming and circu lating efficiency of the boiler and at the same time reducing temperature strains and 15 stresses in the boiler structure. Furthermore it acts to keep the crown sheet flooded with boiler water even at low water levels and raises the capacity elficiency and durability of both the firebox and boiler. Such a siphon element includes an upwardly and rearward- I ly inclined bottom or neck portion fixed in the throat sheet of a 'firebogr and a progressively.

I upwardlyenlarging generally triangular flat tubular body portion, flanged. at its top to fit v in an elongated longitudinal opening in the crown sheet; Such a siphon or circulating element heretofore was made fromasingle metal sheet of the same kind and thickness as the firebox sheet. This sheet after being cut to the desired shape and punched or drilled for the stay bolts was placed in a heavy forming machine which folded the sheet upon itself along its median line and the meeting edges of the sheet were permanently united by an autogenous weld. The upper portions of the sheet were then bent over to provide a flange for attachment of the crown sheet. These, operations consume a large amount of time and call for experienced labor and require special 40 and expensive machinery. Hence the cost of producing such siphons by prior known methodsisgreat. i

' Again under the prior methods of construcing siphons the tubular intake neck portion contained a seam. As aresult of this sea-m it I has been-necessary, to strengthen the intakeobjectionable such staybolts interfere with the best functioning of the intake neck. That is to say when the siphon is installed in the locomotive boiler and is inoperation there'is' a constant movement of the neck under changing temperature and pressure conditions. Our observations lead us also to the conclusion that the cross sectional shape or form of the neck also changes, more or less,

from the true cylindrical form to a somewhat elliptical form. The staybolts are disposed generally along the major axis ofthis modied and elliptical form and they act to restrain the free modifyin movement of neck.

The result is that an un ue strain is-imposed upon that portion of the siphon with theresult that fa lure of that portion of the siphon occurs'sooner than would otherwise be the case.

A general object of our invention is to provide animproved method of making such siphons whereby they may be produced in less time with less material and with less ture thereof. P v 1 Again it is an object of our invention to provide an improved method of roducing labor, thereby reducing the cost of manufacsiphons by the practice of which it shall-be I its intended purpose to the-end that its efiiclencyx may be increased audits effective life lengt ened.

A further object of the invention is to provide a method of manufacture whereby the neck portion of the siphon may be made from seamless tubing, thereby eliminating all seams in the neck portion of the siphon and obviating the necessity of stay bolts as heretofore required and thereby removing the prinpossible to make a siphon better adapted for n cipal contributing agency to breakage of the siphon neck portion.

Still another'object of the invention is to provide a si hon wherein the body thereof may be rodhced' either of a single folded sheet or romtwo coacting preformed sheets butt-welded together and to which the seamless neck may be thereafter welded, the body and] neck having meeting parts so formed that the lines of welding at the sides ofthe siphon are offset, to provide a stronger structure and a'better stay bolt arrangement or lay out.' p

The invention consists generally of the steps, acts and sequence thereof and a device resulting therefrom whereby the above mentioned objects, together with others, as well as the several advantages thereof, that will hereinafter appear, are attalnabl'e; and our invention will be more readily understood by reference to the accompanying drawings which illustrate our improved method of making such siphons.

In the drawings:

Fig. 1 is a view in side elevation of one form of thermicsiphon made in accordance with our improved method. I

Fig. 2-is a view, in elevation thereof, on an enlarged scale.

Fig. 315 a detall vertical sectional View on an enlarged scaleas taken on line 33 of Fig. 1.

Figs. 4 and 5 age views in elevation of the two preformed sheets which when welded together in accordance with one embodiment of the invention, make up the body portion of the siphon.

Fig. 6 is a view in elevation of an oversize length of seamless tubing from which the neck of the siphon is made, said figure showing said tubing before any operations have been performed thereon.

Fig. 7 is a view in elevation. of said length of'tubing'after the first operation or step has been performed thereon as .by'swedging one end thereof to reduce the diameter thereof.

Fig. 8 is a view, which may be considered as a top plan View, of the tube after another operation or step has been performed thereon as by slitting the tube longitudinally along theunswedged part thereof, and off center with respect to 9. vertical plane passing through the axis of the tube.

Flg. 9 is a view in slde elevationafterthe.

tube has been opened'up alon'gcthe line of slitting'to form upstanding parallel side walls of different lengths but before drilling for stay bolts and trimming to fit the-siphon body. v I

Fig. 10 is an end view of the formed tube shown in Fig. '9. i

Fig. 11 is a transverse vertical view on an enlarged scale through the seamless tubular neck of the siphon the plane of said section being indicated'by the line 1111 of Fig. 1.

Referring now in detail to that embodi-" ment of the invention illustrated in the accompanying drawings, 1 indicates as a whole 4 a thermic siphon made in accordance with the preferred manner of our improved method. Sa1d siphon which is of .a substantially irregular shape when viewed in side elevation, .is

somewhat triangular and includes a flat upright hollow body portion 2 and a tubular inclined neck'3 so formed that it not only provides the neck propeqfor the siphon but also the major bottom. part of the body portion.

Althoughthe body portion of the siphon may.

be made of a single piece of sheet metalshaped to size ina suitable forming machine without departing from the essential features of our invention, we prefer toomake up'sald body portion from two separate sheets each of such an outline that when the coacting edges thereof are welded together they will body portion shown in Fig. 1. V

In igs'. 4 and 5 are shown the'preforined right and left hand halves, side portions or produce the walls 4 and 5 respectively, of thev siphon body. 1

The side portion 4 has a substantially straight top defined by an outwardly extending flange 7 to thereafter be connected by a curved cor ner part-10 with a bottom portion 11 arranged in the plane of theinclination of the neck 3 of the finished siphon. .Themajor' bot-tom edge portion 12 of said side wall while arranged 1n a plane parallel with the plane of said flanged bottom ortion '11 is offset upwardly therefrom as Indicated at 13 and said-edge portion 12 joins the front flange portion 7 by. a part 14 arrarigedsubstantially parallel to the plane of the top flange 6. The

I end portions of the flange 6 merge into the flange portions? and9respectively. Through:

out the major portion of this half of the siphon body, stay bolt openings "15,are pro vided in spaced rows paralleling the flanges 6 and 7 respectively while in the bottom portion, stay boltholes 16 are provided in rows.

parallel with said edge portion 12.

The side portion or half 5 is of a substantially similar shape as the side portion 4 so the like-parts are indicated by the same reference numerals. However it is herein pointed outthat the only substantial difi'ercnces are that the bottom edge portion'12 starts at the flange 7 and is inclined upwardly and rearwa'rdly and is joined to the flangell by a portion 13 of a length greater than that. of the portion 13 of the siphon half 4. Thus. if the siphon body halves thus described were-measured on the same verticalline t will be found that the-siphon body half 4 1s of a depth greaterthan that of the siphonbody half 5 by an amount suflicient to accom-- modate the two rows of stay bolt, holes 16. V

In assembling the siphon body .the I two haIves'are placed with their matched flanged edges in engagement, which edges are'thenwelded together as at 17, as best shown m Fig. 2 after which stay bolts 18 are POSltlOIlGd.

in the registering holes 15' and then headed in each half. When the siphon body has thus been assembled it provides a flat hollow structure open at'its-topand' bottom w th transversely rounded ends and with an.out

wardly extending flange bounding its top,

the bottom edge portions 12and 12 thereof being of different lengths so that the 'ortion 12 projects downwardly agreater "stance thanthe portion 12. Theconstructlon of the siphon body and steps mentioned in the production of the same just above described is indeed advantageous because of the economy thereof over the method of making a one piece siphon The respective halves may be readily produced and this without wastage Y of either material or time as they may be readily made by coactingdies. I

The method in the production of the siphon neck, which we pursue, indeed is novel and provides a seamless neck. Said neck is made from a piece of seamless steel tubing 19 (see .Fig. 6) preferably oversize in length and diameter when comparedto the length and diameter of the neck ready for attachment to the. siphon body. The first operation performed on said tubing is to swedge one end thereof to reduce its diameter'down to that of the neck of the finished siphon. This swedged down end is best illustrated at 20 in Fig. 7 ,the-said'end being connected tothe remainder 'of said. tube by the tapered portion 21. Thereafter the other end of the tube is slit longitudinally as at 22' (see Fig. 8, which assumes that the tube is viewed as a top plan view), along a line offset with respect to a vertical plane-23 passing through I theaxis of the tube. Said slit terminates at .its inner end in the saidiverticalplane passing through the tube-axis and adjacent said swedged down end of the tube. Those portions of the tube 'onjboth sides .of, the slit are then opened or upset into parallel spaced relationgto provide side wall parts 24 and 25 of different height-sv arranged equal distances onboth sides of the axis of the tube. During this opening upof said. side wall parts the remainder of said tubeis reduced in "diameter to provide the excess material necessary for said sidewalls and also to bring it down' to the diameter of the swedged'end 20 as bestshown'in Fig. 9, The side walls- 24 and. 25-are spaced'apart a distance equal to the opening between the side walls of the siphon ody the tubular part of the neckis greater than that of said side walls, it is apparent that lines of-fold 2626 are developedalong each side thereof. During this opening or upsetting ,of said walls ofthe neck tube, itis apparent that the point.23 moves radially way from the axis ofthe tube, and for a distance greater than the diameter of the tube and; this point is gradually merged-into the .top

side of the neck 20 by a rounded: corner or curve 27. The neck walls thus formed' are then' punchedor drilled for stay bolts, the

short-er wall 25 having one row 28 of such holes'and the longer wall having bottom, in

termediat and top rows of holes 29, 30' and 31 respectively. The rear end of-the tube thus far operated upon is then trimmed to fit the edge portions 13, 13 of the siphon bod halves; f a

he'neck tube is then fitted in place with alves and as the diameter of I the edges of it'swalls 24-25 in butt-weldable relation with respect to the edges of the side wall portions 12-42 of the siphon body halves, after which they are autogenously welded together .by a line of welding as at 331 Thereafter stay bolts 34 are anchored in the registering rows of holes 28-29 of-the neck tube and other stay bolts 35 are anchored-in the rows of holes 3031 of the wall 24 and in the rows of holesl6'inthe portion 12 of the siphon body. It is of course apparent that the stay bolts 34 which as above described are anchored after welding the neck tube tothe siphon body, may be applied to the siphon tube before said tube is so welded.

When attached to the body the tube provides the neck for the same and at the same time the major portion of the bulge or; enlarged bottom thereof. To make a good tight practical welded connection between the rear end of the'neck tube and those parts of the siphon body as defined-by the flanges 1111 and edge portions 13-13 we provide a bulge.

'as at 43 on the body which decreases inwidth or diameter toward the rear to merge W1tl1 or disappear into the sides of sa1d body.

When such a siphon is in place within the firebox of a locomotive boiler,'the top flange is welded inian elongated longitudinall extending opening in the crown sheet 44 t iercof, while the extreme end of the neck is fixed within the yielding diaphargm portion 45 of the throat sheet 46. In'the operation of the locomotive the siphon is subjected to an .intense heat which causes it to expand and when the fire is drawn and the siphon cools down, i of course contracts. This contrac-' tion; and expansion movement of the siphon is not all in the plane parallel with'the axis of the neck as heretofore assumed but such.

movement appears to be one which fulcrums about-a peripheral portion of the neck and this portion is always at the top side .of the neck adjacent the diaphragm part of the throat sheet. This movement causes a slight downward fiexingor bowing of the neck and this. part ofthe neck then seeks'to change its cross'sectional shape from circular to elliptical to accommodate this flexing or howas best shown by thedotted. lines in Fig. 11.

In a siphon made from a single piece of metal as before mentioned, the welded-seam is on ing. In other words the vertical axis of the neck at this'point becomes-decreased and its "horizontally disposed axis becomes increased the top side of the neck and this, neck necesawayfrom said stay'bolts with Y a consequent breakingdown of said necki Another break costs are thereby saved.

down tendency also occurs as the cross section changes and that is the opening up or splitting of the welded seam along the top of the neck at about the middle of that part thereof which becomes alternately bowed and straightened. -Fromthe above. it is apparent that such a welded seam, stay bolted neck did not have the required flexibility to accommodate itself to these movements.

A neck such as is provided by our improved method, may readily change its cross sectional shape; there are no stay bolts to pull out and there is no seam to open or split,

so that as is apparent, said neck has that degree of flexibility both longitudinally and transversely whereby it readily accommodates itself to such movement without splitting cracking or otherwise breaking down. Again no drilling or stay bolt setting is required in the neck so that time and material The seamless neck being devoid of sta bolts permits the use of a rotary mechanica cleaner'to clean out the neck and bulge which 5 is indeed much preferred to that system of cleaning a stay bolted neck and bulge known as bombardin g Again the siphon bodies and necks may be made up in quantities and of such lengths that they may be readily cut and trimmed to the requirements of any individual siphon.

Again our method eliminatesthe use of the v heavy folding machines employed in making one piece siphons which not only had a'large initial cost but also a large maintenance cost. Another advantage resulting from the ability to omit the stay bolts from the siphon neck is that the capacity thereof is increased. That is to say, there are no ObSiZIJlCtlODS to interfere with the freeand. rapid movement .of the water and steam through this inlet neck on the way to the body of the siphon.

Still another advantage inhering in our method of manufacture and in the devices resulting therefrom is that the neck tube portion of the siphon is of such'size and shape that it can be conveniently treated if desired to make it better adapted to serve its intended purpose. That is to say this necktube portion is the part in which the greatest movefnent and change off shape takes place.

"Hence it is possible, conveniently 'toanneal' or otherwise treat this portion to make it moreductile than the remainder of the siphon. When so treated it would obviously While in describing our improved method we have referred in detail to the-various steps and stated sequencethereof. these are.to be considered as by way of illustration only.- Hence we do not wish to be limited thereto except only asmay be necessary by'the apv pended claims.

the siphon. be better adapted to withstand for a longer period, the severe conditions obtained in use.-

We claim as our invention:

1.- The method of making thermic siphons of the kind described which consists in providing a fiat hollow siphon body having an open bottom, in longitudinally slitting a seamless metallic tubethroughout a portion of its length beginning at one end thereof, opening portions of said tube on opposite sides of the slit to provide upstanding walls thereon, fittingsaid walls to the open bottom of the siphon bod and then welding the same thereto, the unslitted end of said tube welding said staybolted walls to the ,siphon 1 body, the unslitted end of said tube providing a neck extension for the siphon.

3. The method of making thermicsiphons of the kind described which consists in pro-I viding'a flat hollow siphonbody having an open-bottom, andhaving side walls of different depths, in longitudinally slittlng a seamless metallic tube throughout a portion of its length beginning at one end thereof,-

opening up portions of said tube on opposite sides of the slit to provide upstanding walls thereon of different heights, and then weld ing the edges of said siphon body and tube wa'lls together, the unslitted end of said tube providing a neck extension forthe. siphon.

4. The method of making thermic siphons of the kind described which consists in providin a fiat hollow siphon body having an open 'ottom and having'side walls of difierent depths,'in longitudinally slitting a seamless metallic tube throughout a portion of its length beginning at one end thereof, opening up portions of said tube on opposite sides of the slit to provide upstanding walls thereon ofdifferent heights, in staybolting desired upstanding wall portions of the tube together and'then welding the edges of said siphon body and tube walls together, the unslitted end of the tube providing a neck extension for 5. The method of making thermic siphons of the kind described which consists in prov vidin a flat hollow siphon-body having an open ottom and having side walls of difierent depths, in longitudinally slitting a seam-. less metallic tube throughout a portion of its length beginning at one'end thereof, opening up portions of said tube on opposite sides of the slit to provide upstanding walls thereon ofdifferent heights, in staybolting desired upstanding wall portions of the tube to ether,

in welding. the edges of said siphon b y and tube walls together, and then sta bolting one of the tube walls to the opposed wall of the siphon body, and unslitted end of the tube providing a neck extension for the siphon. I

6. The method of making thermic siphons of the kind described which consists in providing a fiat hollow siphon body having an open bottom, and having side walls of different depths in longitudinally slitting a seamless metallic tube beginning at one end thereof and extending throughout a portion of its length along a' line offset from a vertical plane passing through the axis of the tube,

opening portions of the tube on opposite less sides of the slit, to provide upstanding walls of different heights, fittin the upstandingwalls of the tube-to the. si e walls' of the siphon body and then welding the same theret 7. The method of making thermic siphons of the kind described which" consists in providing a flat hollow siphon body having an open bottom and having side walls of different depths in longitudinally slitting a seamless metallic tube beginning at one end thereof'and extending throhghout a portion of its length along a line offset from a vertical plane, passing through the axis of the tube, opening portions of the tube on opposite sides of the" slit to provide upstanding walls of different heights, staybolting portions of the upstanding walls of the .tube, fitting the upstandin walls of the tube to the side walls of the siphon body, and then welding the same thereto.

8. The method of making thermic siphons of the kind described which consists in providing a flat hollow siphon body having an 0 en bottom and having side walls of differen depths, iii-longitudinally slitting a seametallic tube beginning at one end thereof nd extending throughout a portion of its length along a line ofiset from a vertical plane passing throu h the axis of .the tube, opening portions 0 the "tube on opposite sides of the slit, to provide upstanding walls of different heights, weldingthe said walls together and then staybolting the siphon body wall of greater depth to the upstanding wall of greater height of the tube.

9. Themethod of making thermic siphons of the, kind described which, consists in providing a flat hollow siphon body having an open bottom, in providing a length of seamless metallic tubing and reducing the diameter of one end thereof, in longitudinally slitting said tube beginning at the other end thereof, opening portions of the tube on opposite sides of the slitted portion to provide upstanding Walls thereomfitt ingsaid'walls to the open end of the siphon body and then welding the same thereto.

10. The method otmaking thermicsiphons I of the kind described which consists in providin a 'flat hollow siphon body having an open bottom, in providing a length of seamless metallic tubing and reducing the diameter of one end thereof, in longitudinally slitting said tube beginning at the other end thereof, opening portions of the tube on opposite sides of the slit to provide upstanding walls thereon and at the same time reducing the diameter of saidtube end substantially to that of the first mentioned end, fitting said upstanding walls to the open end of the siphon body and then welding the same thereto.

11. The method of making thermic siphons of the kind described which consists in providing open ottom and having side walls of different depths in providing a seamless tube and in swedging one end thereof to reduce its diameter, in longitudinally-slitting the other mentioned end of t e tube to provide the excess metal required for said upstanding walls,

fitting the walls of the tube to the side walls of the'siphon body and then welding the same 7 together.

12. The method of making thermic siphons of the kind described which consists in providing a fiat hollow siphon body having an open bottom and having sidewalls of difierent depths, in providing a seamless tube and in swedging one end thereof to. reduce its diameter, in longitudinally slitting the other end of said tube along a line to one side of .a vertical plane passing through the axis thereof and then opening up portions of the a flat hollowsiphon body having an same time reducin the diameter of the last tube on'opposite sides of the slit to-form upstanding walls of different heights thereon,

and at the same time reducing the diameter of the last mentioned end of the tube to provide the excess metal required for said upstanding Walls, welding the same together and then. staybolting the siphon wall of greater depth to the upstanding wall of greater height on the tube.

13. The method of making thermic siphons of the kind described which consists in providing a flat hollow siphon body having an open bottom and having side walls of different depths, in providing a seamless tube and in swedging one end thereofto reduce its diameter, in longitudinally slitting the other end of said tube along'a line to one side of a vertical plane of the axis of the tube and then opening up portions of the tube on opposite sides of the slit to form upstanding walls of different heights thereon, and at the same time reducing the diameter of the last mentioned end of the tube to provide the excess metal ingmatched parts of a siphon body each with required for said upstanding walls, staybolting desired portions of the upstanding walls of the tube together, fitting the walls of the tube to the walls of the siphon body, and then welding the same together.

V 14. The method of making thermic siphons of the kind described which consists in forming matched parts of a siphon body each with an inturned end flange, fitting the end flanges together and when welding them to provide a flat hollow siphon body having an open bottom, longitudinally slitting a seamless metal tube throughout a portion of its length beginning at one end thereof, opening up portions of the tube on opposite sides of the slit to form upstanding side walls, fitting said walls to the open bottom of the siphon body and then welding the same thereto. 15. The method of makingthermic siphons of the kind described which consists in form-' ing matched parts of a siphon body each with an inturned end flange, fitting the end flanges together and then welding them to provide a flat hollow siphon bod having an open bottom, longitudinally s itting a seamless metaltube throughout a portion of its length v beginning at one end thereof opening up portions of the tube on opposite sidesof the slit to form upstanding side walls,"staybolting desired portions of said upstanding walls together, fitting said walls to the open bottom of the siphon body and then welding the same thereto I 16. The method 'of making thermicsiphons of the kind described which consists in forman inturned end flange, one of said parts havinga side wall of a depth greater than the side wall of the other part, fitting said-end flanges together and then welding the same to provide a flat hollow siphon body open at one end, longitudinally slitting 'a seamless metal a tube throughout a portion of its length, begining at fine end thereof and along a line oflset with respect to a vertical plane passing .through the axis of said tube, opening up parts of said tube on opposite sides of the slit tube to provide upstanding walls of'diiferent heights, staybolting portions of said walls togethen fitting saidupstanding walls to the walls of said siphon body, welding the fitted 'walls together and then staybolting the of the kind described which consists in form siphon body wall of greater depth to the up- 'standmgtube wall of greater height.

17 The method of making thermic siphons ingo'nejend-to reduce its diameter, slittingsaid tube-longitudinally beginning at the other end thereof, opening up portions of the tube on opposite sides of the slit to form upstanding spaced walls, fittin said wallsto S 18. The method of making thermic siphons of the kind described which consists-in forming matched parts of a siphon body each with an end flange, fitting said end flanges together and then welding them to provide a flat hollow siphon body open at one end, providingnseamless metallic tube and swedging one end toreduceits diameter, slitting said tube longitudinally beginning at the other end thereof, opening up portions of the tube on opposite sides of the slit to form upstanding spaced walls, staybolting desired portions. of said upstanding walls together,fitting said walls to the open end of. the siphon body and then welding them together.

19. The method of making thermic siphons of the kind described which consists in form ing matched parts of a siphon body each with inturned end flanges andeach with a side wall, one of which is of a depth greater than the other, fitting and welding the inturned flanges together, providing a seamless metal tube and swedging oneend thereof to reduce its diameter, longitudinally slitting said tube offcenter and beginning at the other end of said tube, opening up portions of the tube on opposite sides of the-slit to provide upstanding walls of different heights and at the same time reducing the diameter of said slitted end of the tube down to that of the first mentioned end, staybolting desired portions of the upstanding walls together, in fitting and welding said upstanding walls to the side walls of the siphon body and then sta-ybolting the siphon body wall of greater depth to the tube wall of greater height. v

20; The method of forming a partofa thermic siphon of the kind described which consists of providing a seamless metallic tube, and swedging one end thereof to reduce .its diameter, slitting the tube longitudinally from the other end and stopping short of said swedged end, and opening up portions of the tube on opposite sides of the slit and at the same time contracting the diameter of said slitted'end down to that of the swedged end, said side walls meeting at the forward thermic' siphon of the kind described which consists in providing a seamless metallic tube, swedging one end thereof to reduce its diameter, slitting said tube longitudinally beginning at the opposite end of the tube and extending in a plane offset. with respect to the axis of the tube and opening up portions of the tube upon opposite sides of the'slit fornithe slit to there merge into one side of the swedged end of the tube.

22. The method of making thermic siphons of the-kind described which consists in providing a flat hollow siphon body having an open bottom, in providing a seamless metallic tube having a slit therein throughout a portion of its length, said slit beginning at a point spaced from one end thereof, opening portions of said tube on opposite sides of the slit to provide upstanding walls thereon, fitting said walls to the open bottom of the siphonbody and then permanently securing the same thereto, the unslittedend of said tube providing a neck extension for the siphon. I

23. The method of making thermic siphons of the kind described which consists in providin a flat hollow siphon body having an open bottom, in providing a seamless 'metallic tube having a slit therein, throughout a portion of its length, said slit beginning at a point spaced from one end thereof, opening portions of said tube on opposite sides of the slit to provide upstanding walls thereon, tit,- ting said walls to the open end of the siphon body, in staybolting desired portions of said' upstanding walls, and then permanently securing saidstaybolted walls to the siphon body, the u'nslitted end of said tube providing a neck extension for the siphon.

' 24. The method of making thermic siphons of the kind described which consists in providing a flat hollow siphon body having an open bottom and having side walls of different depths, in providing a seamless metallic tube having a slit therein throughout a por- "tion of, its length beginnlng' at a point spaced from 'one end thereof, opening up. portions of said tube on opposite sides'of the slit to provide upstanding walls thereon of different heights, and then fitting and permanently scouring the edgesof said siphon body and tube walls together, the unslitted end of said tube providing a neck extension for the siphon.

25. The method of making thermic siphons of the kind described which consists in providing a flat hollow siphon body having an open bottom and having side walls of different depths, in providing a seamless metallic tube having a slit throughout a portion of its length, said slit beginning at a point spaced from one end thereof, opening up portions of said tube on opposite sides of the slit to provide upstanding walls thereon. of different heights, placing the tube and body together and then staybolting one of the tube walls to the opposed wall of the siphon body, the unslitted end of the tube tension for the siphon.

26. The method of making thermic siphons of the kind described which consists in providing a fiat hollow' siphon bodyhaving an open bottom open at one end, in providing a length of seamless metallic tubing having a reduced portion at one end thereof, in longitudinally slitting said tube beginning at a point adjacent the juncture of the reduced portionwith the remainder of the tube, opening portions of the tube on opposite sides of the slitted portion to provide upstanding walls thereon and fitting and securing said walls to the open bottom of the siphon body. .27. The method of making a part for a thcrmic siphon of the kind described which consists in providing a seamless tube and swcdging one end thereof to reduce its diamproviding a neck exeter, in longitudinally slitting the other end of said tube along a line to one side of a vertical plane passing through theaxis of the tube and then opening up portions of the tube on opposite sides-of the slit to form upstanding walls of different heights thereon, and at the same time reducing the diameter of. the last mentioned end of the tube to provide the excess metal required for said upstanding walls. l

2 8. As an article of manufacture, a part for, a thermic siphon of the character described comprising a one-piece member, having a seamless tubular neck portion, a pair ofupstanding walls upon the remaining portion, said upstanding walls forming a slotted opening, and one thereof being of greater height than the other. 1

29. As an article of manufacture a thermic siphon comprising an upper hollow body portion and a lower hollow member secured thereto, said lower hollow member beingin 30. As an article of manufacture a thermic 1 siphon comprising an upper hollow body portion and a lower hollow member secured thereto, said lower hollow member being in onepiece and'forming =a' part of the-bottom of said siphon bod and including a seamless unstaybolted tubu ar portion forming an intake neck. I g E In testimony whereof, I have hereunto set my hand, this 16th day of February, 1927.

WALTER H. HINSGH.

In testimony my hand, this 16th day ofFebruary, 1927.

GUST J. CHRISTENSQN.

whereof, I have hereunto set cmmcxm or oomarlon.

PatentNo. '1. 7i1 ,oq3. Granted June 1,1,1929,

' WALTER a. Hmscn ET AL.

It certified that error appears in the printed specificationof the nbove numbered patent requiring correction a: follow: Page 5, line 6, claim 5,

. iorthe word "and" read "the'-'; and that the said Letters Patent should be read I with this correction therein thatthe some may conform to the record of the cue in the Patent Office. o v

Signed lnd'qenled this, 30thdev of July. A. D. 1929.

J. Moore,-

(SEQ) Acting conmiasioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,717,033. Granted June 11, 1929, to WALTER n. nmscn ET AL.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 5, line 6, claim 5, for the word "and" read "the"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 30th dav of July. A. D. 1929,

M. J. Moore, Acting Commissioner, of Patents.

(Sea!)

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