US1963338A - Method of forming boiler headers - Google Patents

Description

June 19, 1934. c. D. ST. mm Er AL 1,963,338

IETHOD OF FORMING BOILER HEA-DERS ATTORNEYS.

E June 19, 1934. c. D. sT. CLAIR ET Al. 1,963,338

METHOD OF FORMING BOILER READERS Filed Aug. 21. 1929 3 Sheets-Sheet 2 .26 u 1r v INVENToR l i Y /Zzag .f I' 'y ATTORNEYS.

` JunelS, 1934. @0.51am er 1,963,338

IETHOD 0F FORMING BOILR HEADERS Filed Aug. 21. 1929 3 Sheets-Sheet 3 @M/fr MM 36 l l NVENTR.

ATTORNEYS.

Patented June 19, 1934 UNITED STATES PATENr Fries METHOD or FoRmNG BOILER HEADERS Clinton D. St. Clair and Joel Eklund, Erie, Pa., assignors to Erie City Iron Works, Erie, Pa., a corporation of Pennsylvania AAmpliate@ August 21, 1929, serial No. 387,334

`2 Claims.

tures headers permitting an arrangement of a boiler vwith opposing surfaces, such as to permit of the use of straight-ended tubes. The invention also contemplates a method of form,- ing a header that may be readily fabricated from plate, readily stayed, with unsupported surfaces reduced to a minimum, and so fashioned that the rivets joining the parts will be at'the outer part of the header, or away from the direct action of the fire. In making such a header, it is desirable to bend the rear plate of the header so as to accommodate tubes having an angular relation and in the present invention the front plate of the header is bent making the portions of the front plate parallel to opposing portions of the rear plate. This arrangement of plates simplies the hand openings opposite the tubes and otherwise improves the structure. Features and details of the invention will appear. from the speciiication and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawings as follows:-

Fig. 1 shows a longitudinal section through the boiler.

Fig. 2 an outer face View of the front header.

Fig. 3 a section on the line 3-3 in Fig. 2.

Fig. 4 a section on the line 4 4 in Fig. 5.

Fig. 5 a view of the inner plate of the headers.

Fig. 6 a view of the plate form from which the header is made.

Fig. 7 indicates the form of weld used in the abutting surfaces.

Fig. 8 shows a plan view of a complete blank from which a portion of the header is formed.

Fig. 9 a View showing the method of bending the preliminary outer ange.

Fig. 10 a view indicating the manner of completing the bending of the outer ange.

Fig. 11 a view showing the manner of partially bending the corners of the header.

Fig. 12 shows the manner of completing the corner bending.

Fig. 13 a View showing the placing of the header for bending one face wall of the header.

Fig. 14 the manner of completing this bend.

Fig. 15 a side elevation of the bending die.

Fig. 16 a side elevation of the bending block.

1 marks a front header, 2 a rear header, the front header being at a slightly higher level than the rear header and the headers being con- (Cl. 29-157A) nected by tubes 3. The furnace has side walls 4, front wall 5, rear wall -7, top wall 7a, and bridge wall 6, these performing their customary functions and the stack being arranged at 7b.

The boiler is preferably baffled in any desired manner to get the proper traverse of gases, one scheme of bafiiing being clearly shown in the drawings. A cross drum 8 is arranged above the rear header and connected by tubes 9 with the front header and tubes 10 with the rear head- 65 er. The front header is carried by beams 11 forming a gallows frame for the front end of the boiler. Av bracket 12 is secured below the drum 8 and rests on posts 13.

An outer plate 15 of the front header is pro- 70 vided with hand-hole openings 16 and anextension 17 of this header is hung on the gallows frame. This plate is bent at 15al so that the upper portion 15b of the plate is in a plane at an angle to the lower part of the plate.

An inner plate 18 has tube openings 19.` The plate has an upper portion 20 in a planeat an angle to the lowerportion with the juncture at 18a. The part 15b of the upper plate is parallel to the part 20 of the inner plate, and the part 80 l5 of the outer plate is parallel to the lower part of the inner plate. The part 20 of the inner plate is Vdirectly-faced towardthe rear drum andthe receiving tubes 9. In consequence, the tubes 9 make a direct right angle connection to this plate, '86

permitting the use of straight-ended tubes. The body of the plate 18 is parallel to the inner plate of the rear header so that the tubes 3 eX- tend from the inner plate of the header but at ,A right angles to that plate and are consequently straight-ended tubes. The two plates are stayed by stay bolts 21 in the usual manner.

The rear plate has box sides 22. These extend from the rear plate and a marginal flange 23 extends from these sides facing the front plate.

This rear plate is formed from a blank shown in Figs. 6 and 8. In this blank the corners are cut out at 25 and the plate is initially separated at 29 in alinement with the junction between the planes forming the finished plate. The rear plate Having given the plate a preliminary bend, or '110 The die 37 and '105 veo vbe straight-ended tubes.

flange in this operation on ach of the sides along the line A it is followed by flanging it down to a complete 90 bend, as shown in Fig. 10. The plate is then bent, or flanged on the lines B (Fig. 8) and again there is a preliminary bend, as shown in Fig. 11, and a completed bend, or flanging operation, as shown in\Fig. l2. After the header is thus flanged to box form with side anges and terminal flanges thereon it is placed, as in Fig. 13, and the die lowered so as to bend the face of the header forming upper and lower parts with inclined planes. The flanging of the side walls brings the corners together at 26 and the prism-shaped gap at the outer face of the abutting edges is hlled with a welding material forming a weld 27, the gap giving ample material for sealing the corners and producing a satisfactory weld. The abutting edges 28 of the marginal ilanges are also brought together in the flanging operation forming the sides and these abutting edges are welded together. The bending operation between the top and bottom parts of the plate brings the edges of the slot 29 together and these are welded. The edges are closed by a weld 31.V Parts of the slot extending through the marginal fiange have edges 31 which are also brought together and these edges are closed by the same weld 3l.

A strap 32 bridges the weld 3l in the sides and rivets 33 extend through the strap and the sides at each side of the weld. Corner plates 34 are arranged at the corners and re-enforce the welds 27 and these are secured to the adjacent side walls by rivets 35 at each side of the corner welds. The front plate 15 is placed in face engagement with the marginal flanges and is secured to these marginal ianges by rivets 24. lt will be noted that these rivets may be protected by the wall and are thus out of the re. The rear box is formed in a manner exactly similar to that of the front box with the exception'that the inner plate is all in one plane and the upper wall of the box is formed at an inclination to the inner plate to form the same at right angles to the tubes 10 so that the tubes l0 may With this structure of header the space between the front and rear plates which is at the sides of the box is as short rangement of the rivets through this flange. The

flange not only braces the edge of these walls but it makes possible bringing the riveted connection really within the dimensions of the wall itself.

While we have referred to our invention as a method of forming a boiler header, it will be understood that the header formed may be used for boilers and similar purposes.

By making the front plate throughout parallel to the rear plateof the header 1 the hand holes can be more readily fashioned directly opposite the tubes and the stay bolts are uniform throughout and the vside walls make a rectangular box section throughout thus simplifying the struc- Y ture.

What we claim as new is:-

1. The method of forming a boiler header which consists in forming a blank, Hanging the edges of ythe blank a depth to form marginal flanges, fianging the sides and ends forming side wall and end wall anges, bending the blank in a line parallel to the end wall swinging the flanges, hanging the sides and ends forming side i and end wall flanges, the side wall anges terminating adjacent to the bottoms of the'notches in the` sides, bending the blank along a line betweeen the notches, closing the notches and swinging portions of the blank at each side of the planes of the marginal flanges in facing engage-' ment with the marginal anges.

CLINTON D. ST. CLAlR. JOEL EKLUND.

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