Year: 1897

page_text: Date of Application, 30th Mar., 1897--Accepted, 3rd July, 1897.
We, ANDREW WILDMAN, HENRY WILDMAN and WILLIAM WILDMAN, all of
87, N. Clinton Street, in the City of Chicago, County of Cook, and State of Illinois,
United States of America, Gentlemen, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
Our invention relates to certain useful improvements in boilers of that class
in which the water to be converted into steam circulates through tubes and other
chambers which lie in the path of the products of combustion from the fire. To
such end it consists in providing in a water tube boiler certain auxiliary chambers
arranged in such a manner as to cause the products of combustion to travel further
and at the same time reach more surface than is ordinarily accomplished. It
relates also to means for making the flues and other portions within the boiler
easily accessible for the purpose of cleaning or repairing, and to other certain
minor details of construction which will be fully described in this specification
and more definitely pointed out in the claims following:
The invention is clearly illustrated in the accompanying drawing, in which,
Figure 1, is a central vertical longitudinal section, through the boiler; Figure 2,
is a vertical cross section in line 2-2, Figure 1, showing a jacket not seen in
Figure 1; Figure 3, is a front elevation of the upper portion of the boiler, the
man-heads being removed and thereby exposing a number of the flues; Figure 4
is a section similar to Figure 2, of a modification and Figure 5, is a detail section
through a portion of a heat retaining jacket used in connection with this boiler.
In these views, A, represents the outer shell of the boiler and B, the inner casing
which is preferably composed of the arched forward portion, B', having the vertical
side, b, extending down beyond the ash box, and the rearwardly extending
cylindrical portion, 133, lying within the casing and separated therefrom by a
considerable space, which forms a water jacket around the inner casing and which
is adapted to contain the water to be converted into steam. Upon the ends of
the inner casing are tube sheets, 6, 8, the forward tube sheet being extended
downward and connected with the front portion, A', of the outer casing at the
seen in Figure 1.
the boiler
A wall, 3, extends across
and connects the portions, b, and forms together with the front portion, b',
The front
the fire box in which are placed suitable grate bars, C.
portion of the outer casing is shaped approximately similar to the inner casing,
the front being slightly enlarged at, «, and having vertically oxtending walls, a¹,
connected by the transverse wall, a³, and front a¹, thereby completely enclosing
the inner casing and permitting the water to circulate freely around the same.
bottom
85
Within the inner casing are a series of water circulating flues, D, which form
passages for the water between the ends of the water jacket, and through the
combustion chamber extends a box, E, preferably opening at the sides and ends
into the water jacket and securely riveted thoreto at these points. The upper and
lower sheets of the box are preferably connected by a series of stay bolts to insure
solidity and rigidity. In the forward end of the hox is an opening, X, extending

page_text: through the same aud connecting the parts above and below, this opening forms a
passage for the products of combustion from the fire box around the
Hlues below the box and allows the same to return over the box and
out through the smoke-stack, C", at the front of the boiler. By the use of
this separating box it is evident that more heating surface is attained and the flame
is caused to travel through a greater distance within the combustion chamber
evidently producing more steam as a consequence.
Upon the ends of the outer casing are secured boiler heads, F, F³, preferably
dished outwardly as shown to give more room hetween the ends of the outer and
inner casing and also to give strength to the heads. These heads are formed with
a number of man-holes, f, f, preferably eliptical, and of such number and size
as to cover as nearly as possible all of the flues, the object being to give easy access
to the latter for cleaning or repair. They are provided with suitable man-heads, f,
which may easily be removed when it is desired to get at the interior of the boiler.
In the front of the outer casing are also arranged a series of hand-holes, f, whereby
access to the water jacket around the fire box may be had suitable heads, f, being
provided therefor.
At or near the lowest point of the inner casing is an opening, G, leading out
through the outer casing and provided with a suitable man-head, C, the object
of this man-hole being to give access to the interior of the inner casing for the
purpose of cleaning or repairing the same. The man-hole has been placed at the
lowest point at the rear of the inner casing because much of the soot, ashes, etc.,
will lodge there.
A hand-hole, Y, is also shown in the lower rear corner of the boiler and
hand-holes Y, Y8, in the water legs to afford easy access thereto.
We have shown a steam dome, I, supported above the boiler and connected
therewith by a pipe, i, and two pipes, , which are adapted to convey part of the
steam generated in the boiler, to the dome without compelling the same to travel
to the upper end of the boiler before entering the dome. A suitable valve,, is
provided for allowing the steam to escape from the dome. The position of the
dome is immaterial and we have shown in dotted lines a dome, I', arranged above
the forward portion of the boiler and connected therewith by a suitable pipe.
Along the outer casing and in line with the box are a series of openings, e,
normally closed up by suitable plugs, e', which when removed afford access to the
box, and permit the same to be cleaned or repaired. A series of tubes, e, connect
the inner with the outer casing whereby the tubes or other portions within the
inner casing may be reached for any purpose desired, the tubes, e³, being normally
closed by stoppers, e
In order to prevent any great radiation of heat from this boiler we have provided
a covering of asbestos, J, laid upon a wire netting, j, and separated from the
boiler by a series of blocks, j'. This covering may evidently be placed around
all of the exposed portions of the boiler if desired or only upon such portions as ure
apt to radiate more heat than is desirable.
The modification illustrated in Figure 4 is of a different style of box. In this
case the box does not extend to the sides of the inner casing but is connected
therewith by a series of tubes, , thereby allowing the water to circulate freely
between the water jacket and box.
In using this modification we lay castings, e³, V shaped in cross section upon
the tubes, e, to prevent the products of combustion from escaping from the lower
chamber into the upper between the water box und the water jacket.
In the description of our invention we have shown a boiler containing one water
box only. It is obvious, however, that two or more may be used by alternating the
opening therethrough from end to end.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-

page_text: 1: In a water tube boiler, the combination with a flue chamber for the passage
of the products of combustion, water tubes therein and a water jacket around said
chamber, of a water box within said flue chamber connected with the water jacket,
and having an opening near the rear of said chamber: substantially as described.
2: In a water tube boiler, the combination with a flue chamber for the passage
of the products of combustion, water tubes therein and a water jacket around
said chamber, of a water box extending across said flue chamber and opening at
the sides and front into the water jacket; substantially as described.
3: In a water tube boiler, the combination with a flue chamber for the passage
of the products of combustion, water tubes therein and a water jacket around
said chamber, of a water box separating the upper from the lower portion of the
fue chamber except at the rear, and connected with the water jacket around the
flue chamber and a series of openings in the outer casing approximately in line
with the water box; substantially as described.
4: In a water tube boiler, the combination with a flue chamber for the passage
of the products of combustion, water tubes therein and a water jacket around
said chamber, of a water box separating the upper from the lower portion of the
flue chamber except at the rear, and connected with the water jacket around the
flue chamber, and a series of flues connecting the inner with the outer casing;
substantially as described.
5: In a water tube boiler, the combination with a flue chamber for the passage
of the products of combustion, water tubes therein and a water jacket around
said chamber, of boiler heads rivetted to the ends of the outer casing, man-holes
located in said boiler-heads and in suitable numbers to facilitate easy access to
all of the flues and offset with respect to each other at the opposite ends of the boiler;
substantially as described.
6: In a water tube boiler, the combination with a flue chamber for the passage
of the products of combustion, water tubes therein and a water jacket around
said chamber, of a water box separating the upper from the lower half of the fluo
chamber except at the rear end, and a man-hole connecting the bottom of the inner
casing with the outer casing; substantially as described.
7: In a water tube boiler, the combination with a flue chamber for the passage
of the products of combustion, water tubes therein, a water jacket around said
chamber, and a water box separating the upper from the lower portion of the flue
chamber except at the rear end and connected with the water jacket, of a heat
retaining covering composed of a layer of non-conducting material, a wire screen
and a series of blocks separating the same from the casing; substantially as
described.
8: The combination with a boiler, of a heat retaining covering consisting of a
series of struts resting against the exterior of the boiler shell, a wire screen resting
upon the outer ends of the struts and a jacket of non-conducting material covering
the wire screen; substantially as described.
Dateu ti o ay or match 1001
WALLACE FAIRWEATHER,
Of the firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicants.