Improvements in Steam Douer à urnaces Of F1008.
Year: 1899

page_text: Date of Application, 17th Mar., 1899
Complete Specification Left, 18th Dec., 1899-Accepted, 20th Jan., 1900
Improvements in Steam Douer à urnaces Of F1008.
I, ERNEST GEARING, of Penshurst, Clarence Drive, Harrogate, in the County of
York, Engineer, do hereby declare the nature of this invention to be as follows:-
As is well known in steam boiler furnaces or flues of circular form in cross
section the resistance to collapse is largely governed by the diameter of the
furnace or flue; one of a given diameter and thickness offers greater resistance
to collapse than another of the same thickness but of larger diameter; and from
time to time it has been proposed in various ways to produce furnaces or flues
of large or comparatively large diameter, adapted to offer high resistance to
compression by thickening certain portions of their walls, but so far as I know
the results have not so far proved satisfactory owing to difficulties and dis-
advantages encountered in the process of manufacture as well as in actual
working.
Now my invention has for object the manufacture of furnaces or flues offer-
ing great resistance to collapse which shall possess longitudinal elasticity and
efficient steam generating powers as compared with other forms of furnaces or
flues with which I am acquainted.
For this purpose according to one construction the furnace or flue as seen in
longitudinal section presents a series of annular corrugations or outwardly
extending hollow or bridge-like ridges, having integral therewith solid annular
ribs or bands that project therefrom into the water space of the boiler, and por-
tions of furnace or Hue wall between the said ribbed annular corrugations or out-
wardly extending hollow or bridge like ridges of greater thickness than the
latter such thickness being made according to requirement sufficient to with-
stand the desired pressure.
In another construction the furnace or flue wall is made with annular corru-
gations or hollow or bridge like ridges with intervening cylindrical portions of
wall of less thickness than the said corrugations or hollow or bridge like ridges
and with annular solid bands or ribs integral with the rest of the wall, these
bands or ribs projecting into the water space of the boiler, acting as heat con-
ductors and admitting of longitudinal elasticity besides serving to increase the
resistance offered by the furnace or flue to collapse and so that the portions of
furnace or flue wall around which they are formed are or may be made thinner
than the portions connecting same with the annular corrugations or hollow or
bridge like ridges.

page_text: COMPLETE SPECIFICATION.
Improvements in Steam Boiler Furnaces or Flues.
"
I, ERNEST GEARING, of Penshurst, Clarence Drive, Harrogate, 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 ascer-
tained in and by the following statement:-
As is well known in steam boiler furnaces or flues of circular form in cross
section the resistance to collapse is largely governed by the diameter of the
furnace or flue; one of a given diameter and thickness offers greater resistance
to collapse than another of the same thickness but of larger diameter; and from
time to time it has been proposed in various ways to produce furnaces or flues
of large or comparatively large diameter, adapted to offer high, resistance to
compression. by thickening certain portions of their walls, but so far as I know
the results have not heretofore proved satisfactory owing to difficulties and dis-
advantages encountered in the process of manufacture as well as in actual
working.
Now my invention has for object the manufacture of furnaces or flues offer-
ing great resistance to collapse which shall possess longitudinal elasticity and
efficient steam generating powers as compared with other forms of furnaces or
flues with which I am acquainted.
Figure 1 of the accompanying drawing shows in longitudinal section a por-
tion of the wall of a furnace or flue constructed according to my invention.
a, a are annular corrugations or outwardly extending hollow or bridge-like
ridges; formed solid therewith as by rolling are annular ribs or bands b, b that
project into the water space of the boiler. c, c are portions of furnace or flue wall
between the said annular corrugations a, a, of greater thickness than said corru-
gations, such thickness being made according to requirement sufficient to with-
stand the desired pressure.
Fig. 2 is a similar view to Fig. 1 showing a construction wherein the furnace
or flue wall is made with annular corrugations or hollow or bridge-like
ridges a', a¹ and with intervening cylindrical portions c¹, c of wall of less thick-
ness than the said corrugations, a and having formed integral therewith, as
by rolling, annular solid bands or ribs d projecting into the water space of the
boiler, acting as heat conductors and admitting of longitudinal elasticity be-
sides serving to increase the resistance offered by the furnace or flue to collapse
so that the portions of furnace or flue wall around which they are formed are
or may be made (as shewn) thinner than the portions connecting same with
the annular corrugations a¹, a¹.
f
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
My improved constructions of boiler furnaces or flues hereinabove described
with reference respectively to and illustrated in Fig. 1 and in Fig. 2 of the
accompanying drawing.