Year: 1888

page_text: Date of Application, 9th Feb., 1888
Complete Specification Left, 25th Oct., 1888
Complete Specification Accepted, 30th Nov., 1888
I, FRANCIS WILLIAM WEBB, of Crewe, in the County of Chester, Mechanical
Engineer, do hereby declare the nature of the said invention to be as follows :—
My invention refers to boilers for generating steam, of the Locomotive type, and
relates to the construction of the fire box, and its combination and arrangement with
the shell and flue tubes of the boiler.
The object of my invention is to so construct the fire box and combine it with the
shell of the boiler, as to give the greatest possible freedom for expansion and con-
traction of the metal, so as to be able to employ by preference what is known as
"mild steel," in the construction of the fire box (instead of copper) though other
metals may be used, if desired.
"
22
According to one modification of my invention the rectangular form of fire box is
used but with a water bottom but the plates forming the fire box are corrugated―
The fire hole door is formed in a manner invented by me and described in the
specification of Letters Patent No. 692, 1878 and now in use for many years,
that is
to say, the outer shell plate round the door hole is first bent in a round curve inwards
and then outwards the angle of the plate round the door hole being at about an angle
of 45 degrees to the plane of the shell and the plate of the fire box is bent to a round
curve outwards to come parallel and close to the angle of the plate of the shell the two
being then united by rivets.
The hole from the ash pan is formed in like manner to that for the fire hole door.
The top of the fire box is stayed by a series of cross cast steel beams, through holes
in which bars pass in the lengthway of the boiler, these bars going through links
jointed to connections secured to the inside of the upper shell of the boiler, the fire
box being thus suspended from the shell, and is free to expand and contract, as the
cross beam stays are free to allow of expansion and contraction on the longitudinal
bars, and the suspending links also allow of movements transversely and upwards, or
a portion of the top may be semicircular and the combustion chamber or that portion
of the fire box which projects into the barrel part of the boiler stayed only. There
are the usual stays between the shell and fire box, and there are angle stays between
the casing of the shell and the front end plate of the boiler.

page_text: The front or fire hole door plate of the shell at the fire box end is bent all round to
a curve inwards and then to a right angle to the plane of the plate to form the joint
for the rivets to pass through, both heads of which are thus outside so that the rivets
can he readily cut and the fire box inserted and withdrawn from the shell when
required.
According to another modification of my invention the fire box is formed by two
cylinders one over the other with a space between the two cylinders, but a part of
these cylinders in front of the fire box are not entire circles as the bottom of the
upper and top of the lower cylinder is absent, and the sides of the two partial
cylinders are united by flat or curved plates and through this space the fuel can be
placed on the grate bars in the lower cylinder, and the hot gases can ascend from the
furnace in the lower cylinder to the upper cylinder and pass along it and through the
combustion chamber (when used) to the flue tubes.
The combustion chamber, or that part of fire box which projects into the barrel
of the boiler, is or may be enlarged until it comes into the usual form at the tube
plate end of an ordinary fire hox, and the upper part of this part of the fire box is
stayed by beams suspended from the upper inside of the shell of the boiler, as herein-
before explained, or the tube plate may be placed in a line with the back end of the
lower cylinder dispensing with the combustion chamber projecting into the barrel of
the boiler.
The plates forming the cylinders for the fire box are or may be united transversely
by flange joints, known as the "Adamson joint," and the upper and lower cylinders
are tied together by caulking plates in these joints.
The cylindrical portion of the fire box may be corrugated, if desired.
The end plates of the fire box are or may be formed with annular corrugations,
to give elasticity, and allow expansion and contraction, and the holes for the fire
door and ash pan are formed, as hereinbefore described, and the ends are also
stayed to the front shell by angle stays, as before mentioned.
In the upper and lower cylinder of the fire box are or may be placed "Galloway"
or other hollow "water tubes," giving strength and heating surfaces and increasing
the circulation.
The outer shell of the fire box part of the boiler is also formed by the parts
of two partial cylinders enclosing those forming the fire box but with a water
space between.
The space between the upper and lower partial cylinder of the shell are united
by curved plates, and the plates uniting the partial cylinders of the fire box and
these curved plates uniting the outer shell, partial cylinders are connected by solid
stay bolts or hollow stay bolts to admit air, while the other part of the curved plates
uniting the partial cylinders of the external shell are tied together by bolts or
stays extending from side to side.
The joint between the end plate of the front shell of the fire box, and the outer
shell is formed as herein before described.
"
Bolt stays are used between the front shell of the fire box, and the front face
of the fire box but all other bolts stays oxcept those already named may be
dispensed with.
Dated this Eighth day of Fobunanu. 1000

page_text: COMPLETE SPECIFICATION.
Improvements in Locomotive and other Boilers for Generating
Steam.
I FRANCIS WILLIAM WEBB of Crewe in the County of Chester Mechanical
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 :-
My invention refers to boilers for generating steam of the Locomotive type, and
relates to the construction of the fire box, and its combination and arrangement with
the shell and flue tubes of the hoiler.
The object of my invention is to so construct the fire box and combine it with the
shell of the boiler as to give the greatest possible freedom for expansion and
contraction of the metal, so as to be able to employ by preference, what is known as
mild steel in the construction of the fire box (instead of copper) though other metals
may be used if desired.
According to one modification of my invention the rectangular form of fire box is
used but with a water bottom," the plates forming the fire box are corrugated with the
exception of the bottom which I prefer to leave plain. The fire hole door is formed
in a manner invented by me, and described in the specification of Letters Patent
No. 692-1878 and now in use for many years, that is to say, the outer shell plate
round the door hole is first bent in a round curve inwards and then outwards the
angle of the plate round the door hole being at about an angle of 45 degrees to the
plane of the shell and the plate of the fire box is bent to a round curve outwards to
come parallel and close to the angle of the plate of the shell the two being then
united by rivets.
The top of the fire box is stayed by a series of cross cast steel beams through holes
in which bars pass in the lengthway of the boiler these bars going through links
jointed to connections secured to the inside of the upper shell of the boiler, the fire
box being thus suspended from the shell, and is free to expand and contract, as the
cross boam stays are free to allow of expansion and contraction on the longitudinal
bars and the suspending links also allow of movements transversely and upwards, or
a portion of the top may be semicircular and the combustion chamber or that portion
of the fire box which projects into the barrel part of the boiler stayed only There
are the usual stays between the shell and fire box, and there are angle stays between
the casing of the shell and the front end plate of the boiler.
The front or fire hole door plate of the shell at the fire box end is bent all round to
a curve inwards and then to a right angle to the plane of the plate to form the joint
for the rivets to pass through, both heads of which are thus outside so that the rivets
can be readily cut and the fire box inserted and withdrawn from the sholl when
required.

page_text: According to another modification of my invention the fire box is formed by two
cylinders one over the other with a space between the two cylinders, but a part of
these cylinders in front of the fire box are not entire circles as the bottom of the
upper and top of the lower cylinder is absent and the sides of the two partial cylinders
are united by flat or curved plates and through this space the fuel can be placed on
the grate bars in the lower cylinder and the hot gases can ascend from the furnace
in the lower cylinder to the upper cylinder and pass along it and through the
combustion chamber (when used) to the flue tubes.
The combustion chamber or that part of fire box which projects into the barrel of
the boilers is or may be enlarged until it comes into the usual form at the tube plate
end of an ordinary fire box, and the upper part of this part of the fire box is stayed
by beams suspended from the upper inside of the shell of the boiler as herein before
explained, or the tube plate may be placed in a line with the back end of the lower
cylinder dispensing with the combustion chamber projecting into the barrel of the
boiler.
The plates forming the cylinders for the fire box are or may be united transversely
by flange joints known as the Adamson joint and the upper and lower cylinders are
tied together by caulking plates in those joints.
The cylindrical portion of the fire box may be corrugated if desired.
The end plates of the fire boxs are or may be formed with annular corrugations to
give elasticity and allow expansion and contraction, and the holes for the fire door and
ash pan are formed as herein before described and the ends are also stayed to the
front shell by angle stays as before mentioned.
In the upper and lower cylinder of the fire box are or may be placed Galloway or
other hollow water tubes giving strength and heating surfaces and increasing the
circulation.
The outer shell of the fire box part of the boiler is also formed by the parts of two
partial cylinders enclosing those forming the fire box but with a water space
between.
The space between the upper and lower partial cylinders of the shell are united by
curved plates, and the platos uniting the partial cylinders of the fire box and these
curved plates uniting the outer shell, partial cylinders are connected by solid stay
bolts or hollow stay bolts to admit air while the other part of the curved plates
uniting the partial cylinders of the external shell are tied together by bolts or stays
extending from side to side.
The joint between the end plate of the front shell of the fire box, and the outer
shell is formed as hereinbefore described.
Bolt or gusset stays are or may be used between the front sholl of the fire box, and
the front face of the fire box but all other bolt stays, except those already named may
be dispensed with.
Fig. 1 is a longitudinal section of the fire box end of a Locomotive type of boiler
according to my invention, and fig. 2 is a plan section in about the line A-B-C-D
fig. 1, fig. 8 is a cross sectional elevation on the line E, F fig. 1, and fig. 4 is a front
elevation; these figures illustrating that modification of my invention in which the
fire box is of rectangular form, and having a water bottom."
Fig. 5 is a longitudinal section of the fire box end of a Locomotive type of boiler
according to my invention and fig. 6 is a vertical cross section in the line C-D fig. 5
looking towards the barrel of the boiler, fig. 7 is a plan section on the line A-B
fig. 5, and fig. 8 is a front elevation, these figuros illustrating the other modification
of my invention, where the fire box is formed by the combination of two cylinders as
hereinafter explained.
In the modification illustrated by figs. 1 to 4, a is part of the barrel of the boiler,
6 the shell of the boiler enclosing the fire box.
The front plate 6x at the fire box end is bent at its edge as shown to fit the shell b
so that both heads of the rivets securing the plate bx and shell 6 together are at
the outside and can be readily rivetted up or removed when the fire box is in
position.

page_text: The fire box c is or may be of the form shown and corrugated that is, the top sides
and two ends of the plates forming the fire box are corrugated as shown, and the
bottom left plain if desired.
The junction between the front plate b* and the fire box round the hole for the fire
box door d is formed as shown, and as described in the specification of Letters
Patent granted to me Numbered 692, A.D. 1878.
The junction between the fire box and shell round the hole e from the ash pan is
formed in like manner to that for the fire hole door. fare ordinary beam stays.
There are the usual screw stays between the fire box c and its enclosing shell bas
shown in fig. 2.
Part of the fire box enters or may enter the barrel part of the boiler as shown in
fig. 1, 9 being the tube plate, flare bars passing through the beam stays f, the bars fl
passing through links f³, attached to the shell of the boiler, as shown in figs. 1 and 3
and are angle stays hetween the shell b, and end plate *.
In the modification shown by figs. 5 to 8 inclusive, a is part of the barrel of the
boiler, which is continued to form the shell 6 enclosing the upper part of the
fire box.
The shell b¹ enclosing the lower part of the fire box is also the segment of a cylinder
and the two ends of the segments of the cylinders band bare united by curved
plates ², or the plate 6' forming the lower segment of the cylinder is made long
enough and is curved to be united as shown by rivets with the two ends of the
segment & forming the upper part of the shell enclosing the fire box.
The part c and c¹ of the fire box are cylinders and at each end they are united by
means of the Adamson flange joint with a caulking plate between the flanges, these
caulking plates and to which the flanges are rivetted closing the ends of the
space between the cylinder c and c².
The caulking plate also closes the back end of the cylinder c¹ and is or may be
corrugated by annular corrugations as shown.
This plate has also the hole e in it from the ash pan and it is united as shown and
as hereinbefore described in reference to figs. 1 and 2 to the end shell 6³ of the
fire box.
The upper portion of the plate c³ may also be used to form the tube plate or the
tube plate may be rivetted to the flanges along with the plate c³ when there is no
combustion chamber g¹.
"The part and c of the fire box are formed by the segments of two cylinders
connected at the sides by curved or flat plates c" these segment of cylinders are united
by flanges and rivets at one end to the flanges of the cylinders c and c¹ and the other
ends are closed by an end plate c' which has or may have annular or partly annular
corrugations.
This end plate c' and the shell end plate 6* are united at the fire hole door d and
the back end plate c³ is united with the shell as hereinbefore described in reference
to figs. 1 and 2.
The caulking plate and end ca extends past the sides of the upper cylinder c (see
fig. 6) and a combustion chamber g¹ of cylindrical form in its lower part is united to
it by rivets and flanges this combustion chamber g¹ extending into the barrel part a of
the boiler as shown.
is the tube plate at the inner end of the combustion chamber g.
are ordinary beam stays at the upper part of the combustion chamber 9, ƒ³¹ bars
suspended by links ƒ³, ƒ³ are angle or gusset stays between the shell b and
end bx.
There are cross stays ca extending from the curved part 6 of the shell of the fire
box on one side to the curved plate 6 on the other side, passing between the two
cylinders c and e³.
There are one or more rows of solid or hollow screw stays cⓇ between the curved
part 63 of the fire box shell, and the flat or curved plates c of the fire box (see
fig. 7).
The grate bars in the fire box are placed in the lower parts c¹ and c².

page_text: The hot gases ascend from the lower to the upper cylinders c* and c and pass to the
combustion chambers g' and flue tubes.
The cylindrical part of the fire box may be corrugated if desired.
The cylinder c and partial cylinder c' may be stayed by what are known as Galloway
tubes, if desired.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,
1. The construction of the fire boxes of boilers with corrugated plates, when
combined with the shell of the boiler at the fire hole door, and the hole from the ash
pan substantially as hereinbefore described and illustrated by figs. 1 to 4 inclusive of
the drawings.
2. The construction of the fire boxes of boilers and their enclosing shell by
cylinders and partial cylinders combined together substantially as hereinbefore
described and illustrated by figs. 5 to 8 inclusive of the drawings.
3. The construction of fire boxes and combination with the shell of the boilers
substantially as hereinbefore described and illustrated by figs. 5 to 8 inclusive of the
drawings.
Dated thi