Year: 1886

page_text: I, DAVID MIDGLEY, of the Wood Nook Iron Works, Stanningley, Leeds in the
County of York, Engineer, do hereby declare the nature of this invention to be as
follows:
1-
According to this invention flexibility and additional heating surface are given to
boiler flues or furnaces by the use of what may be called inverted expansion rings or
hoops which are inserted between some or all of the adjoining sections of the flue or
furnace. These rings are of a U or similar section such that the U portion projects
towards the axis or interior of the flue or furnace and not outwards after the manner
of what is known as the Bowling ring. My rings may be connected to the sections of
the flue or furnace by any convenient means: for instance, the ring may be flanged
and the flanges rivetted directly to cylindrical sections, or the sections may be flanged
and rivetted to the circumferential portions of the rings. The advantages of these
inverted expansion rings are that they not only increase the heating surface of the flue
or furnace, but also by projecting into the flame or products of combustion, break up
the current of hot gases, thereby ensuring a better combustion and a more uniform
distribution of the heat.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.

page_text: I, DAVID MIDGLEY, of the Wood Nook Iron Works, Stanningley, 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:—
According to this invention, flexibility and additional heating surface are given to
boiler flues or furnaces by the use of what may be called inverted expansion rings or
hoops which are inserted between some or all of the adjoining sections of the flue or
furnace. These rings are of a Ụ or similar section such that the U portion projects
towards the axis or interior of the flue or furnace and not outwards after the manner
of what is known as the Bowling ring. My rings may be connected to the sections of
the flue or furnace by any convenient means, for instance, the ring may be flanged
and the flanges rivetted directly to cylindrical sections, or the sections may be
flanged and rivetted to the circumferential portions of the rings. The advantages of
these inverted expansion rings are that they not only increase the heating surface of
the flue or furnace, but also by projecting into the flame or products of combustion,
break up the current of hot gases, thereby ensuring a better combustion and a more
uniform distribution of the heat.
In the accompanying two sheets of drawings I have shown examples of applications
of rings according to my invention to boilers of different types.
Fig. 1 illustrates in longitudinal vertical section the furnace and part of the flue
tube of a Cornish or a Lancashire boiler.
Fig. 2 shows in vertical section the application to a vertical boiler.
Fig. 3 is a horizontal section on the line 1-2, Fig. 2.
Fig. 4 shows in vertical section part of a forge or furnace stack boiler.
Fig. 5 is a half horizontal section on the line 3-4, Fig. 4.
Fig. 6 is an elevation partly in section, of part of an externally fired egg-ended
boiler with my rings applied to it.
In each of the arrangements shown, each of my rings marked-A is shown as made
of U shape in transverse section, but the same may be equivalently formed; and the
construction and application in each case are such that the U part of the ring projects
inward towards the centre or axis or. interior of the furnace or flue. In Fig. 1 the
rings project towards the axis or interior of the boiler furnace and flue tube, two of
those behind the bridge are formed with cylindrical flanges B that are connected to
adjacent cylindrical sections C of the flue tube by rivets. The others are not made
with such Hanges, but the furnace and flue tube sections C are flanged outwardly, and
to their flanges the rings or hoops are rivetted. With this arrangement the rivets are
wholly within the water space of the boiler, and are consequently not subject to the
action of flame and products of combustion.
In the boiler illustrated in Figs. 2 and 3, one ring or hoop A only is employed,

page_text: which is flanged cylindrically, and is connected to the adjacent sections Ċ of the fire box
by rivets as shown.
In Figs. 4 and 5 three flanged rings or hoops are shown, the lower one having one
flange cylindrical and the other conoidal.
In the arrangement illustrated in Fig. 6, the rings or hoops A are flanged cylindri-
cally and connected to the inner surfaces of the cylindrical sections D of the boiler
shell by rivets.
When the rings are arranged as in the examples illustrated in Figs. 1, 2, 3, 4, and 5,
so as to project into the furnace or flue, they not only afford additional heating surface,
but likewise serve to break up the current of hot gases, and ensure efficient combustion
and uniform distribution of heat. The rings likewise impart strength and power to resist
collapse to those portions of a boiler to which they are applied, likewise admitting of
expansion and contraction end wise without injury to the boiler.
Having now particularly described and ascertained the nature of the said invention,
and in what manner it is to be performed, I declare that what I claim is :-
1. My expansion ring or hoop made of U or similar section with flanges or parts
for attachment to flue or other sections of a boiler from which the U or equivalent
part projects inward towards the axis of the ring or hoop substantially as described.
2. The construction of parts of steam boilers with inverted expansion rings or hoops
substantially as hercinabove described with reference respectively to Fig. 1-Figs. 2
and 3-and Figs. 4 and 5 of the drawings.
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