US414767A - Of harrogate - Google Patents

Description

ihvrren" STATES sAMsON rox, OF HARROGATE, COUNTY or YORK, ENGLANDT CORRU'GATED FURNACE OR FL-UE.

SPECIFICATION forming part of Letters Patent No. 414,767, dated November 12, l1889.

Application filed January 25, 1888. Serial No. 261,920. `(No model.) I

To ,ZZ-wLOm-it may Concern:

Be it known thatI, SAMSON FOX, a subject of the Queen of Great Britain and Ireland, residing at Harrogate, in the county of York, Kingdom of Great Britain and Ireland, have invented' new and useful Improvementsin th-e Manufacture of Corrugated Boiler Furnaces and Flues, of which the following is a specification. A

My invention consists in the manufacture of boiler-f urn aces orfire-boxes and flues, with corrugations of peculiar form, as hereinafter described, whereby such articles are enabled to resist compression to a greater extent than corrugated furnaces or fire-boxes and fines as heretofore proposed to be made; and for this purpose my invention consists, essentially, in affording the additional resistance to collapsing strain without increasing the depth of the corrugations by making the corrugations thicker er deeper at their inner and outer ridges than at those parts which connect the inner and outer rid'ges, the mode of manufacture being such that the thickness or depth at the inner and outer ridges shall be equal, or thereabout, to the thickness of the plate preparatory to corrugating, the parts connecting the said inner and outer ridges beingl drawn thinner by the process of corrugating.

Referring to the accompanying drawings, Figure 1 shows in central longitudinal section a boiler-ue according to my present invention. Fig. 2 shows to a larger scale a section of corrugated plate such as above referred to.A Fig. 3 shows a modified form of the corrugations.' Fig. 4 shows longitudinal sections of rolls that may be employed to produce corrugations according to my present. invention.

Whenr a tube has been welded, it is heated and then placed in a corrugating-machine and corrugated by rolls; but in some cases it may be more convenient to produce corrugations such as described by other means than a rolling-machine, and such as referred to in the specification of British Letters Patent granted to me, No. 1,097,'dated March 10,

r- 187 7--viz, by swages-such as shown in Figs.

7 and 8 of said specification, but corrugating by the rolling-machine in accordance with my United States Patent No. 225,586, dated March 16, 1,880, I believe to be the most convenient way of producing the ,corrugations where practicable.

A B C are corrugations comprising outer ridges d, inner ridges b,and thinner connecting parts c. ample illustrated constitute outer and inner ribs -or beads; but the format-ion may be modified by making the parts a and b'offa forni gradually diminishing in thickness to that of .the .connecting `part c, as shown in Fig.' In t-he manufacture of such a corrugated flue I take a plate of metal of suitablethickness, according` to the pressure the intended flue is designed to resist,

The thickness of plate I employ for a due to resist a given pressure is according to my present invention greater than the thickness heretofore employed in the manufacture of iiues with Ordinary corrugations designed to resist. the same pressure. For example, heretofore in making a corrugated flue of adiameter of three feet six inches, to resist a pressure of about one hundred and forty to one hundred and fifty pounds per square inch, it has been usual to employ a plate of metalsuch as mild steel-having a thickness of half an inch; but in carrying out mypresent rlhe'ridg'es av and hin the exinvention I may with advantage use a plate haying a thickness of three-quarters or an 8o inch, or such as will coincide with the general scantling of the boiler towhich such furnace or fiue tube is to be attached. lVhen a round flue is to'be produced-such as illustrated, by way of example, in the drawingsthe said plate is bent to the tubular form and the joint is welded; but, as will be evident, my present invention so far as relates to the peculiar formation of the corrugations may be applied in boiler tire-boxes, furnaces, and fines of various forms, including such as described in the specification of another applica-A tion by me for Letters Patent of the United States, bearing even date herewith,- Serial No. No. 261,919. To proceed with the description A A', and the guide-rolls, marked O O', respectively, in the drawings annexed to the specification of my said United States Patent No. 225,586, March 16, 18SO,Will require to be removed from the machine and other main rolls substituted therefor of the form shown at A2 A3, Fig. 4, having suitable grooves a4, for forming the ridges d Z7 on the external and internal corrugations of a tube under treatment, and guide-rolls O2 O3, Fig. 5, having suitable grooves O4 for the reception of the ridges c as they are being formed, and when the section of the corrugations are required, as shown in' Fig. 3, the grooves inthe rolls are made to suit such form.

It will be understood that according to my present invention there are produced at the outer and inner ridges, beads, or additional ridges or parts a and b, respectively, ot' a thickness equal, or nearly so, to that of the plain plate or flue previous to corrugation, the remaining parts c of'the corrugations being drawn thinner by the process of corrugating.

What I clairn as my invention is 1. In a steam-boiler furnace, fire-box, or Hue corrugation's, each of which is thicker at the ridge than at the sides or parts that connect one ridge with another, substantially as described.

2. In asteanl-boiler furnace, fire-box, or iiue, corrugations comprising outer and inner ridges a and b, and connecting parts c, said ridges being thicker t-han said connecting parts, substantially as described.

3. In a steam-boiler furnace, tire-box, or Hue, corrugations comprising outer and inner ridges a, and b, and connecting parts c, said ridges being made in the form of beads or ribs of greater depth than said connecting parts c, substantially as described.

4. In a steam-boiler furnace, fire-box, or fine, corrugations comprising outer and inner ridges c and b, of a depth or thickness about equal to that of the plate previous to corrugation, and connecting parts c, drawn thinner in the process of corrugating, substantially as described.

5. The herein-described process of making steam-boiler furnace, fire-box, or flue, consisting in first bending a plate of metal tothe form cfa tube, then Welding the joint, then forming around said welded tube corrugations comprising outerandl inner ridges a and l), with connecting parts c, said connecting parts being drawn out or reduced in thickness by the act' of corrugation until they are thinner than the ridges, substantially as described.

Leeds, October 3, 1887. SAMSON FOX.

In presence of- THos. E. CRAVEN, WM. SADLER,

Both of Leeds.

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