Improvements in or relating to Steam Boiler Furnaces.
Year: 1893

page_text: Date of Application, 1st Feb., 1893-Accepted, 4th Mar., 1893
COMPLETE SPECIFICATION.
Improvements in or relating to Steam Boiler Furnaces.
I, HENRY CROMPTON ASHLIN, of 34 Leadenhall Street, in the City of London,
Consulting 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 :—
This invention relates to the boiler front plates, furnaces or furnace tubes or flues
of steam boilers, particularly marine boilers, the object in view being to secure the
easy removal renewal or replacement of the furnace tube intact without the
necessity of taking the boiler itself to pieces in the operation.
The invention will be best understood by reference to the accompanying drawings
in which
Fig. 1 represents a section through a portion of the front plate of a boiler with
part of the furnace in position, and
Fig. 2 a longitudinal section of a furnace such as would be used in Fig. 1.
Fig. 3 is a similar view to Fig. 1, but the flange upon the front plate of the
boiler is turned outwards instead of inwards.
Fig. 4 is also similar to Fig. 1, but the flange of the front plate is turned partly
outwards and partly inwards, and the front plate carried straight down as usual
instead of being angled.
Figure 6 represents a furnace suitable for use with the front plate Figure 4.
Like letters indicate like parts throughout the drawings.
A represents the boilor front which in Fig. 1 is shown tapered from A. to A' and
internally flanged at A. The furnace B shown is one of the wellknown corrugated
furnace tubes now largely employed, and as shown in Fig. 2, is also tapered at its
front end from C to D to match the boiler front and at that end has no flange. A
plain or other style of tube can be used if desired. At its other or combustion
chamber end it is made in the ordinary manner and flanged up at the part E.
Figure 1 illustrates the way in which this furnace may be removed from the
boiler; the rivets are driven out from both ends and the furnace tube brought
forward into the position shown in Fig. 1, when it will be seen that either with or
without slightly tilting the forward end, the tube will drop clear of the front plate
owing to the inclination thereof.
The same result could be obtained with the boiler front slanted in the opposite
direction and the lower part brought forward beyond the upper, the tube being
formed and manipulated in the opposite way; the form shown in the drawing is
however preferred. The arrangement shown in Fig. 3 is for working purposes the
same as that shown in Fig. 1, but the flange A' of the front plate A is turned
outwards instead of inwards; the operation is the same as that first described.
In Fig. 4 the front plate is shown with the top half or portion of the flange A'
turned outwards and the lower half or portion turned inwards, the furnace B
Fig. 5 being at its front end shaped to correspond, while at its back end the top
half or portion is flanged as before and the bottom cut off straight on the line of
the flange. This arrangement may be reversed the upper portion of the flange A'
being turned inside and the lower portion outside and in this and other cases the
flanges can be entirely dispensed with and angle iron substituted for them.
In describing the front plate of the boiler slanted or with the top and bottom
flanges oppositely arranged I have described what is doubtless quite the most
satisfactory arrangement, but it will be understood that the same result could be
attained, if the plate were slanted not from top to bottom, but from side to side or
if the flanges were oppositely arranged, not at top and bottom, but at the sides, the
tubes being arranged to correspond.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
clain is,―
1. The method of permitting or facilitating the removal and replacement of the
furnace tube of a steam boiler by slauling the front plate at the furnace opening as
from A to A¹ so as to allow of the unflanged portion of the back end of the tube
clearing the plate while the flauged portion is still prevented from passing sub-
stantially as described and illustrated in Figures 1 and 3 of the accompanying
drawings.
2. The combination with the front plate of a steam boiler slanted as from A to A'
of a furnace tube such as B not flanged at its front end and slanted to match the
boiler front and having a part-flange at its back end substantially as described
and illustrated in Figures 1 to 3 of the accompanying drawings.
3. In a steam boiler a front plate having the furnace opening slanted as
from A to A and flanged internally substantially as described and illustrated in
Figure 1 of tho accompanying drawings.
4. In a steam boiler a front plate having the furnace opening slanted as
from A to A¹ and flanged externally substantially as described and illustrated in
Figure 3 of the accompanying drawings.
6. In a steam boiler a front plate having the furnace opening flanged externally
at its upper portion and internally at its lower portion or vice versa substantially
as described and illustrated in Figure 4 of the accompanying drawings.
G. In a steam boiler the combination with a front plate having the furnace
opening flanged internally and externally of a furnace tube not flanged at its front
end but shaped to correspond with the flanges of the front plate and having only
a half or part flange at its back end substantially as described and illustrated in
Figures 4 and 5 of the accompanying drawings.
Deted this 21st day of Jan 1902