Year: 1895

page_text: Date of Application, 14th Sept., 1895-Accepted, 16th Nov., 1895
I, CARL LUDWIG AUGUST FRIEDRICH BUTTNER, of Uerdingen on the Rhine,
n the Province of the Rhine, German Empire, Manufacturer, do hereby declare
he nature of this invention, and in what manner the same is to be performed,
o be particularly described and ascertained in and by the following statement :-
This invention refers to flame tube boilers, or more particularly to the end walls
of the same, and my improvements in said end walls relate to a special configuration
of them, the purpose being to provide for an unhindered longitudinal extension of
the flame tubes without combining the latter for that purpose with special auxiliary
means, as employed hitherto..
It is known, that by inserting elastic intermediate pieces into flame tubes the
strength of the latter is somewhat reduced, and it is further known, that the
ordinary flat end walls, as well as the curved ones used since some time, do not
allow of a sufficient elongation of the flame tubes, if perfectly rigid ones are
employed. The purpose proper of our invention, therefore, is to make either sort
of said end-walls adapted to be used in connection with said rigid tubes, and we
attain our object by bending a certain portion of one or both end walls of the
boiler inwards, so as to reduce the distance between the places of support of the
flame tube or tubes. Said inwardly bent portions of the end wall or walls behave
exactly so as the elastic intermediate flame tube pieces employed hitherto, i.c. they
are able to give way, and to move outwards, according to the longitudinal extension
of the tubes.
I have represented as an example a curved end-wall of a Lancashire boiler;
Figure 1 is a front-view of said wall, Figure 2 a vertical section taken on
line 4-8 of Figure 1, and Figure 3 is a horizontal section taken on line 9-10 of
Figure 1.
A designates the whole of the end-wall, and a a¹ a 2 a 3 the inwardly bent part
or portions of it. Said portions are situated unsymmetrically with regard to the
upper and lower half of the wall, and also the openings A¹ A. 2 for the flame-tubes are
situated unsymmetrically with regard to the upper and lower half of said inwardly
bent part of the wall. Owing to this arrangement, the elasticity of the portions a' a 3
is greater than that of the portions a a 2, which corresponds to the known tendency
of the flame tubes to extend more in their upper halves than in their lower ones.
Having now particularly described the nature of my said invention, and in what
manner the same is to be performed, I declare that what I claim is :-
1. A flame tube boiler having one of, or both, its end-walls provided with an
inwardly bent part or inwardly bent parts containing or surrounding the opening
or openings for the flame tube or tubes, for the purpose as described.
2. A flame tube boiler having one of, or both its end-walls provided with an
inwardly bent part or inwardly bent parts containing or surrounding the opening
or openings for the flame tube or tubes, said part or parts being situated

page_text: unsymmetrically with regard to the space above and below said opening or
openings, substantially as described.
Dated this 12th day of September 1895.
CARL LUDWIG AUGUST FRIEDRICH BÜTTNER,
By Geo. H. Rayner,
37 Chancery Lane, London, W.C., Agent for the Applicant.