Improvements in Steam Boiler or similar Furnaces.
Year: 1890

page_text: Date of Application, 1st May, 1890
Complete Specification Left, 5th June, 1890-Accepted, 5th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in Steam Boiler or similar Furnaces.
I, HENRY CROMPTON ASHLIN of 34 Leadenhall Street, in the City of London,
Consulting Engineer, do hereby declare the nature of this invention to be as
follows:-
--
The object of this invention is to facilitate the application and removal of the
furnaces, more particularly in marine boilers, where great difficulty is at present
experienced when an old furnace has to be removed and a new one inserted. Usually
the furnace is so secured that it is a most difficult matter to get it out but by my
invention this becomes quite a simplu operation.
In carrying out my invention 1 prefer to flange the front tube plate or front plate
of the boiler around the furnace opening but to leave the back tube plate plain around
the said opening. I provide the furnace with a flange at its back or inner end to fit
up against the back tube plate but [ leave it plain at its front end where it can be
rivetted to the flanged plate of the boiler. The lower portion of the back end of the
furnace I prefer to cut away at an angle to facilitate its removal.
By this arrangement it is a comparatively simple matter to remove or replace the
furnace as all that is necessary is to knock out the rivets, draw the furnace forward
until the flange at the upper portion of its back end meets the flange of the front
plate when by canting the furnace up the cut-away portion can be caused to clear
the lower portion of the flanged furnace opening in the front plate and the furnace
can then be freely removed.
TL:n 1 1900
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Steam Boiler or similar 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 :—
The object of this invention is to facilitate the application and removal of the
furnaces, more particularly in marine boilers, where great difficulty is at present
experienced when an old furnace has to le removed and a new one inserted.
Usually the furnace is so secured that it is a most difficult matter to get it out but
by my invention this becomes quite a simple operation.
In carrying out my invention I prefer to flange the front tube plate or front
plate of the boiler around the furnace opening but to leave the back tube plate plain
around the said opening. I provide the furnace with a flange at its back or inner
end to fit up against the back tube plate but I leave it plain at its front end where it
can be rivetted to the flanged plate of the boiler. The lower portion of the back end
of the furnace I prefer to cut away at an angle to facilitate its removal.
By this arrangement it is a comparatively simple matter to remove or replace the
furnace as all that is necessary is to knock out the rivets, draw the furnace forward
until the flange at the upper portion of its back end meets the flange of the front
plate when by canting the furnace up the cut-away portion can be caused to clear
the lower portion of the flanged furnace opening in the front plate and the furnace
can then be freely removed.
In the accompanying drawings;—

page_text: Fig. 1 is a longitudinal section of the tube in position and Fig. 2 is a similar view
showing the tube in course of removal.
A is the furnace tube which may be of any ordinary construction either corrugated
ribbed or plain but having one end preferably the forward and terminating in a plain
cylindrical portion B and its other end flanged at (for a portion of the way round.
The extent of the flange C would depend upon the shape of the combustion chamber
and plates of the boiler against which the tube has to fit but it might be carried
round generally for about one-third more or less of the circumference of the tuho. In
the drawings the flange C is stopped off somewhere about the point ("the exact
position depending as stated above upon the shape of the plates to which it has to be
attached. The portion of the back end of the tube from D to E is tapered off by
which means as shown in Fig. 2 when the tube is withdrawn its lower portion clears
the front furnace plate so that the rube can be droppel and the flange cleared
from the upper portion of the front plate.
The front plate is flanged inwardly at F the back plato G not requiring to be
flanged at all. The rivets at the front end would be placed through the cylindrical
portion B of the tube and the flange "aud at the back through the flunge (and
plate G at the upper portion and through the tapered portion of the tabe D to E and
the plate of the boiler at the other part. In Figure 1 the furnace tube is shown in
position. In Figure 2 it is in process of removal and has been drawn out as far as
the flange will allow; to complete the removal it may be tilted if necessary until
the corner E clears the plate F.
By this means it will be seen thai an existing furnace tube may he removed and
repaired or a new one replaced without otherwise disturbing the boiler.
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
claim is :-
1. A furnace tube having no flange at one end and partly flanged as at C and
partly cut away obliquely as at D E at its other end for the purpose of facilitating
its removal or replacement substantially as described and illustrated in the accompanying
drawings.
2. Making a furnace tube with no flange at one end and with a portion of a flange
and a portion obliquely cut away at the other end substantially as and for the purpose
described and illustrated in the accompanying drawings.
Dated this 4th day of Juna 1890.
HENRY CROMPTON ASHLIN,
W. P. Thompson & Boult,
Agents for the Applicant.