Improvements in the Construction of Steam Boilers.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Construction of Steam Boilers.
We, GEORGE COOPER, Assistant Engineer, and THE LEEDS FORGE COMPANY,
LIMITED, Engineers and Ironmasters, both of the Leeds Forge, Leeds, in the County
of York, do hereby declare the nature of this invention to be as follows:-
This invention has reference to improvements in the construction of steam
boilers of cylindrical type and it has for object to so construct the front plate of
such a steam boiler as to allow of a furnace flue having a flanged back-end, or
each of such flues where there is more than one, being withdrawn and replaced,
say by a new furnace, in a simple, effective and inexpensive manner and without
necessitating the removal of the front plate of the boiler:
For this purpose the front-plate of a steam boiler is constructed with one or
more furnace-holes having or each having the upper-half or portion of the circum-
ference flanged either inwards or outwards, the lower half or portion of the circum-
ference being left plain or unflanged, and having secured around it an angle plate
or strip of section the vertical flange of which is rivetted to the juxtaposed
portion of the front plate so that the remaining flange will project horizontally,
either inward or outward, and serve as a flange for the lower-half or portion of
the furnace hole and correspond with the flange of the upper-half or portion
thereof. A flange all-round the furnace hole is thus formed to which the mouth
of the furnace flue can be rivetted in position in the usual way. The adjacent ends
of the fixed and removable flanges may be connected together by a strap or junction
piece secured to both. A portion of the front plate surrounding the lower half
or portion of the furnace hole is, or may be, cut away so as to thereby increase the
diameter or size of the lower half or portion of the furnace hole in relation to
the upper-half or portion.
It will be seen that on removing the angle-plate or strip, a furnace flue can be
readily inserted or withdrawn through the furnace hole, the lower half or portion
of which, especially when made of an increased diameter relatively to the upper
half or portion, allowing the flanged back-end of the furnace flue to readily clear
it. The diameter or dimensions of the lower half or portion of the furnace hole
will be in proportion to the dimensions of the back-end of the furnace flue to be
passed through such hole.

page_text: We, GEORGE COOPER, Assistant Engineer, and THE LEEDS FORGE COMPANY,
LIMITED, Engineers and Ironmasters, both of the Leeds Forge, Leeds, in the County
of York, 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:-
-
This invention has reference to improvements in the construction of steam
boilers of cylindrical type' and it has for object to so construct the front plate of
such a steam boiler as to allow of a furnace flue having a flanged back-end, or
each of such flues where there are more than one, being withdrawn and replaced
say by a new furnace, in a simple, effective and inexpensive manner and without
necessitating the removal of the front plate of the boiler.
For this purpose the front plate of a steam boiler is constructed as we shall
now explain by the aid of the accompanying illustrative drawings wherein Fig. 1
is a cross section on the line - of Fig. 2, and Fig. 2 is a vertical central section
on the line y-y of Fig. 1, showing a portion of one construction of front plate
according to this invention.
Figs. 3 and 4 are similar views to Figs. 1 and 2 respectively, showing a modified
construction. Figs. 5 and 6 show alternative constructions. Fig. 7 illustrates a
furnace flue of the kind referred to, being withdrawn through the furnace hole.
1 is the furnace front of plate metal in which is formed one or more furnace
holes 2. According to this invention the 'metal plate around the upper half or
portion of the circumference of the furnace hole or each such hole is flanged at 1"
either outward as shown in Figs. 1 to 4 inclusive, or inward as shown in Figs. 5
and 6, the plate around the lower half or portion of the circumference of the hole
being left plain or unflanged, and having secured around it a removable angle
plate or strip of section the vertical flange 3 of which is riveted to the front
plate so that the remaining flange 3º will project horizontally, either outward
(as shown in Figs. 1 to 4 inclusive), or inward (as shown in Figs. 5 and 6) so as to
serve as a flange to the lower half or portion of the furnace hole and correspond
with the flange 1 of the upper half or portion thereof. The vertical flange 3 of
the angle plate or strip may be secured to the outer side of the front plate, as
shown in Figs. 1 to 4 and in Fig. 6, or to the inner side of such plate, as shown in
Fig. 5.
Hange 1", 3" all round the furnace hole is thus formed to which the
mouth of a furnace flue 4 can be riveted in position in the usual way. The adjacent
ends of the fixed and removable flanges 1 and 3 may be connected together by
a strap or junction piece secured to both as indicated in dotted lines at 5 in Figs. 1
and 2; or, as shown in Figs. 3 and 4, straps 5" may be riveted partly to the front
plate and partly to the flange 3 of the angle plate, the adjacent faces of the straps 5
and flange 3 being tapered away to form a neat joint as shown in dotted lines in
Fig. 4. A portion of the front plate surrounding the lower half or portion of the
furnace hole 2 is, or may in some cases be cut away as shown at 6, Figs. 3 to 7 so
as to thereby increase the diameter or size of the lower half or portion of the
furnace hole in relation to the upper half or portion, the horizontal flange 3 of
the angle plate or strip being however of the same radius as the upper half or
portion of the furnace hole.
By the construction described it will be seen that on removing the angle-plate
or strip 3, 3, a furnace flue 4 of the kind mentioned can be readily inserted o
withdrawn through the furnace hole 2, the lower half or portion of which
especially when made of an increased diameter relatively to the upper half o

page_text: portion as shown in Figs. 3 to 7 inclusive, allowing the flanged back-end 4* of
the furnace flue to readily clear it. The diameter or dimensions of the lower half
or portion of the furnace hole 2 will be in proportion to the dimensions of the
flanged back-end 4* of the furnace flue 4 to be passed through such hole.
Although the invention has been described in connection with steam generators
provided with furnace flues having flanged back-ends, it can also be used for
facilitating the insertion and removal of other kinds of furnace flues, for example
furnace flues of the kind known as "down-end" flues, that is to say a flue having
its mouth of a smaller diameter than its body (see dotted lines in Fig. 6) and with
or without a flange at its back-end.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1. Constructing the front plate of a steam boiler with a furnace hole the metal
surrounding the upper half or portion of which is flanged either inwards or out-
wards whilst the metal around the lower half or portion of the hole is left plain
and has secured to it a removable angle plate or strip of 7 section one of the
flanges of which projects from the front plate either inwards or outwards to serve
as a flange for the lower half or portion of the furnace hole and corresponds with
the flange of the upper half or portion thereof, the arrangement being such that
on removing the angle plate or strip the flanged inner or back end of a furnace
flue such as herein referred to, can be readily inserted and withdrawn through the
furnace hole, substantially as described.
2. A steam boiler front plate of the kind specified in the preceding claim in
which the lower half of the furnace hole is made of a larger diameter or radius
than the upper half, substantially as described.
3. A steam boiler having a front plate with one or more flanged furnace holes
constructed substantially as hereinbefore described with reference to and shown.
in Figs. 1 and 2; or modified according to Figs. 3 and 4 or to Fig. 5, or to Fig. 6
of the drawings annexed
Dated this 4th day of May 1898.
For the Applicants,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.