US1751092A - Steam boiler - Google Patents

Description

C. B. LITTLE STEAM BOILER March 18, 1930;

Filed Jan. 26, 1928 2 Sheets-Sheet 1 Fir rill/1! I l// lL/II 11/ CLARENCEB,

C. B. LITTLE STEAM BOILER March 18, 1930.

Filed Jan. 26, 1928 2 Sheets-Sheet 2 Jrvuonbu Old Form.

CLAREN E BJSITTQE, 74im-m QMZW;

I My Patented Mar. 18, 1930 CLARENCE B. LITTLE, OE DAYTON, OHIO, ASSIGNGR TO THE BBOVJ'NELL COLIPANY, F

DAYTON, 01-120, A CORPORATION OF OHIO STEAM BOILER Application filed January 26, 1928. Serial'No. 249,617.

come together, whereby these sheets will be in effect homogeneous or continuous at the corners or angles of the water leg, the electrically welded meeting edges being thus made to run together and unite to make this portion of the inner wall contiguous.

One result of this structural coordination and union of the several sheets at the offset portions, as stated, is that of adding strength and greater certainty against leakage where the sheets of the inner wall come together in the offset portion thereof.

Another result is that of reduction in the cost of forming the joint between such portions of the inner wall, my plan under which the union is effected through the use of electric welding being less expensive than the constructions heretofore employed for making a water tight connection between the several sheets of the inner wall at the offset por- 0 tion, as will more fully appear hereinafteri These several objects are carried into practical effect in the manner and by the means presently to be stated.

In the accompanying drawings:

Figure 1 is a perspective view of a corner ofthe water leg of a steam boiler of any conventional type with my improved joint applied thereto. I

Figure 2 is a plan view of what is shown in Fig. 1 bringing out particularly the mere line in the mitre joint between two adjacent inner walls of the water leg.

Figure 3 is an inverted plan view of the same parts, showing them as they appear 5 when viewed from the bottom upward,

bringing out the nature of the joint between two adjacent sheets of the inner wall.

Figure 4: is a sectional view taken on the line 4=4: of Figure 3, also looking upward, and showing the inner walls in section taken through the offset or inclined portions of the inner wall. 1

Figure 5 is a similar view to Figure 1 showing the old method of making the joint between the adjacent edges of the sheets composing the inner wall of the water leg or lining of thefire box; a comparison with the new joint my invention provides will'make plain the difference between the old and the new.

In the drawings the numerals 1 and 2 indicate the outer wall of a steam boiler water leg, the numeral 1 indicating one sheet and the numeral 2 another'sheet of the leg, such sheets being at right angles to. one another. A full water leg includes, of course, two additional outer walls, but these I omit to simplify the illustration and the more readily to show the joint between thesheets which constitute the inner wall of the water leg. The inner wall, as shown in Fig. 1, comprises corresponding sheets 3 and 43 both of which are deflected at an angle at the point 5 which 1 term the ofiset, so as to leave an intervening space which is for the water and to close that space along the bottom portions of the.

inner wall as indicated at. 7, Where the inner sheets are shown riveted permanently to the outer sheets. Spacers indicated at 8 are placed between the inner and outer walls to keep the sheets in their fixed separated relation so as to leave the water space.

Coming now nearer to the feature of my invention it will be noted thatfiange 9 and the corresponding flangelO (of the sheet 4) joint. This joint consists of positioning the meeting edges 13 and 16L of the offset portions of the inner sheets, 3 and at, quite close together, say as an example, one-eighth of an inch,

so that these edges will readily unite and disappear when fused by the operation of elecare terminated at the point 12, so that the .tric welding. Again, the sheets bordering the edges 18 and 14 are beveled, as indicated at- 15 and 16 in Figures 3 and a, so as to cause reduced thickness in the margins of the sheets as indicated at 17 and 18 in Figure hwhereby the edges the more readily fuse when the current is applied. i

In Figure 4E I have exaggerated somewhat the thicknessof the sheets, the width of the beveledportions and the space between the meeting edges 13 and 14, before the act of welding in order to more clearly show the construction. b

In Figure 2 I have shown the meeting edges by a single line 19 without indicating any space between the edges of the two sheets. When the sheets are positioned andconnected upwith the outer walls, preparatory to the welding operation, their meeting edges along the offset portions will be as stated, approximately one-eighth of an inch, so that when the fusing operation occurs by the application of the electric current, these edges will unit by the flow of the metal; and this o-perationis aided by the beveling of the adjacent margins ofthe sheets, as above stated. In order to more clearly define the Zone constituted of the union of the sheets, I have shown in Fig. 3

the space between the lines 15 and 16 shaded with short cross-lines.

Theseremarlrs refer tothe appearance of the union of the sheets looking at the bottom or loWer sides of the offset portions as shown 'inFig, 1 and Fig. 3.

. Looking down upon the upper side of the offset portlons as in F 1g.2, a line 19 appears I ,to indicate where the mere, joint formerly was, but where now after the electric Welding operation the joint as a joint has disappeared and thesheets are in union. ,The zone of the union is, therefore, narrower on that 7 part of the offset portions of the inner sheets which is next to the water in the water leg, while the'zone of the union as it appears next tothe fire box or on the inner face of the offset portions is wider, due tov the flow of the metal having been essentially produced on that face of the: margins of the sheets as indicated by thebeveled portions 15 and 16.

irnd it will be observed atthis point, by reference to F igQ 5, where the old form of construction is shown, that I have entirely tegrality of the meeting edges of the onset portions of the inner sheets. i

All danger of leaksat this point is eliminated. The joint is permanent, as muchrso as any part of the sheets because of the perfect fusing of the mar inal edges; and in this sense I have made a homogeneous joint where before there was only an overlapping of the parts held down by rivets.

I regard myself as the firstto makea homogeneous or integral union of the adjacent marginal edges of the innersheets or wall of a boiler fire box; and particularly the first to accomplish this by means of an electric welding together of the adjacent marginal edges of the oifset portions of theinner sheets. 7 r I I desire to comprehend within my invention such modifications as may be clearly embraced within my claim and the scope ofmy invention. 1 I

Having thus fully describedjmy invention what I claim as new anddesire to secure by LettersPatent, is:

In a boiler water leg, a pair of rectangular sheets of metal, said sheets being united at right angles to each other alongparts of one- CLARENCE B. LITTLE;

done away with the lower part, indicated at a, I

of the overlapping portion of the inner sheets as indicated at- 20 and 21, as also the rivet or rivets, as the case may be, which formerly were used in uniting the-lower portions of these overlapping parts 20 and 21 to each other and to the outer sheets of the water leg.

My joint here. described is more quickly made than was the oldjoint herereferred to, and with less expense, and is more effectivein that as distinguished from parts that are merely overlapped and riveted down together, in myjoint there is effected an in

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