Improvements in Steam Boiler Flues and Fire-boxes.
Year: 1895

page_text: Date of Application, 19th July, 1895
Complete Specification
Loft 47th Cab
1000
20th
4000
Date of Application, 19th July, 1895
Ը
Complete Specification Loft. 17th Feb., 1806 Accepted, 29th Mar., 1966
PROVISIONAL SPECIFICATION.
Improvements in Steam Boiler Flues and Fire-boxes.
I WILLIAM DEIGHTON of 13 Hyde Terrace Leeds in the County of York
Engineer do hereby declare the nature of this invention to be as follows:-
Improvements in steam boiler flues and fire-boxes.
Corrugated and ribbed boiler flues and fire-boxes have previously been made
circular in cross section and of various forms in their longitudinal section to all
of which various objections have been made, some when under working conditions
and others in process of manufacture. In my invention I construct a flue or
fire-box with corrugations as follows. The flue or fire-box is cylindrical in
cross section the outward projecting corrugations in the longitudinal section may
be rounded or curved or by preference flat in the centre and rounded off at each
end of flat (symetrically on each side) to meet the radii of the inwardly projecting
corrugations. The inwardly projecting corrugations is formed of a short flat, at
each end of which a curve or radii is struck to meet the radii of the outer or
projecting corrugation. The thickness of the metalic plates forming the intended
flue or fire-box (bent and welded before corrugating) may be of uniform thickness
for plain ended or flanged flues or fire-boxes, but I prefer to use plates thickened
on one edge for flanged flues or fire-boxes. When the thickness varies (as it
usually does after rolling) I prefer it to take place in the outward projecting
corrugations as this part is least in contact with the products of combustion in the
flue or fire-box. Great advantage will be obtained in rolling my flue by having
the said flats in the section as they will prevent the tendency of the flue or
fire-box (when under the rolling process to take a spiral form, as is often the case
with the existing forms, they being all formed of true curves.
Dated this 18th day of July 1895.
WILLIAM DEIGHTON.
Improvements in Steam Boiler Flues and Fire-boxes.
I, WILLIAM DEIGHTON, of 13 Hyde Terrace, Leeds, in the County of York,
Engineer, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
Corrugated, and ribbed boiler flues, or fire boxes, have previously been made
circular in cross section, and of various forms in their longitudinal section, to
all of which, various objections have been made; some when under working
conditions, and others in process of manufacture.
In my invention I construct a flue, or fire box, with corrugations as follows:
The flue, or fire box, is cylindrical in shape in cross section, the outwardly
projecting corrugations in the longitudinal section may be rounded, or curved,
or by preference flat in the centre, and rounded off at each end of flat, symetrically
on each side, to meet the radii of the inwardly projecting corrugations. The inwardly
[Pec 8.1

page_text: projecting corrugations are formed of flats, (the length of which may be varied to
suit requirements) at each end of which a curve or radii is struck to meet the radii
of the outwardly projecting corrugations.
The thickness of the metallic plates forming the intended flue or fire box, (which
is bent to a circular shape aud welded longitudinally before corrugating) may
be of uniform thickness for plain ended, or flanged flues, or fire boxes, but I prefer
to use plates thickened on one edge for flanged flues, or fire boxes.
When the thickness of the metal varies, as is generally the case after corrugating,
I prefer it to take effect upon the outwardly projecting corrugations, as this part
comes least in contact with the products of combustion in the flue, or fire box.
In the accompanying sheet of drawings, various sections of corrugated flues or
fire boxes are shown according to my improvements, illustrating the relative
positions of the flats which I have found to give the best results in rolling, without
in any way diminishing the strength of the flue or fire box.
In Fig. 1. a. is a flat in the centre of the inwardly projecting corrugations,
preferably about two inches wide. b, b, are flats in the centre of the outwardly
projecting corrugations preferably about half an inch wide.
The ends of the flats a, a, and b, b, are rounded off, and the radii joined together
forming symetrical curves c, c.
Fig. 2. shows a modified section of corrugated flue, or fire box.
In this case
I roll a flat d, preferably about two inches wide, in the centre of the inwardly
projecting corrugations only, and extend the ends of the flat in the form of
a curve e. e. The outwardly projecting corrugations f. f. I roll in the form of a
curve, or arch, the radii of which joins e. e.
Figs. 3, and 4, show further modifications. In these figures the flats shown
and h, on the inwardly projecting corrugations are extended in width.
at g,
I have found in practice that during the process of rolling a corrugated flue or
fire box of the designs most generally in use, (that is consisting of inwardly, and
outwardly projecting curves,) the tendency is for it to assume a spiral form,
this necessitating frequent adjustment of the rolls, and in some cases the removal
of the flue from the mill for the purpose of being turned round; and afterwards
replaced in the mill, all of which operations add to the cost of production, but
which are obviated by my invention.
It will be understood that the width of the flats on either the outwardly, or
inwardly projecting corrugations may be varied, to suit the various designs of flues,
or fire boxes, required to be produced.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that
what I claim is :-
1. The manufacture of corrugated steam boiler flues, or fire boxes, in which the
inwardly and outwardly projecting corrugations are formed with flats in the centre,
as shewn in longitudinal section, and as described and shown, in Figs. 1, and 4, of
the accompanying drawing.
2. The manufacture of steam boiler flues, or fire boxes, in which the inwardly
projecting corrugations are formed with flats in the centre, and the outwardly
projecting corrugations are of a curved, or arched form, as shewn in longitudinal
section, and as described and shown in the accompanying drawing Figs. 2. and 3.
Dated this 17th day of February 1896
WILLIAM DEIGHTON.