IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1876

page_text: LETTERS PATENT to Peter Jensen, of Chancery Lane, London, for the Invention
of "IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS." A communi-
cation from abroad by the Firm of Höcker Brothers, of Budapest, in the King-
dom of Hungary.
Sealed the 23rd September 1876, and dated the 30th March 1876.
PROVISIONAL SPECIFICATION left by the said Peter Jensen at the Office of
the Commissioners of Patents on the 30th March 1876.
PETER JENSEN, of Chancery Lanc, London.
"IMPROVEMENTS IN THE CON-
STRUCTION OF STEAM BOILERS." A communication from abroad by the Firm of
Höcker Brothers, of Budapest, in the Kingdom of Hungary.
These improvements apply to return tube boilers, or such in which the flame and
products of combustion, having passed through the fire-box, return to the front of
the boiler through tubes, and then pass off to the chimney.
The fire-box is preferably made oval in section or so that the upper larger portion
of its circumference is made circular, and the lower smaller portion struck with a
larger radius or made concentric with the lower part of. the shell. The fire-box,
back uptake, and tubes are all connected to the boiler front plate, which is fastened
to the shell by bolts and nuts, so as to be detachable when required for cleaning
and repairs. The back plate of back uptake is stayed to the boiler back plate by
means of bolts and nuts, which have also to be detached when required. The whole
inside of the boiler being thus detached from the shell the former can be drawn out
of the latter.
The lower part of the fire-box is formed with stiffening plates, rings, or ribs resting
on the inner lower part of the shell, and facilitating the drawing out of the inside
of the boiler. The lower part of back uptake is preferably flush with the aforesaid
lower part of fire-box.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Peter Jensen in the Great Seal Patent Office on the 30th September
1876.
PETER JENSEN, of Chancery Lane, London. " IMPROVEMENTS IN THE CONSTRUC-
TION OF STEAM BOILERS." A communication from abroad by the Firm of Höcker
Brothers, of Budapest, in the Kingdom of Hungary.
These improvements apply to return tube boilers, or such in which the flame and
products of combustion having passed through the fire-box return to the front of
the boiler through tubes, and then pass off to the chimney.
The fire-box is made of such a section that the upper larger portion of its circum-
ference is made circular, and the lower smaller portion struck with a larger radius
or made concentric with the lower part of the shell. The fire-box, back uptake,
and tubes are all connected to the boiler front plate, which is fastened to the shell
by bolts and nuts so as to be detachable when required for cleaning and repairs.
The back plate of back uptake is stayed to the boiler back plate by means of bolts
and nuts, which have also to be detached when required. The whole inside of the
boiler being thus detached from the shell the former can be drawn out of the
latter.
The lower part of the fire-box is formed with stiffening plates, rings, or ribs
resting on the inner lower part of the shell, and facilitating the drawing out of the
inside of the boiler. The lower part of back uptake is preferably flush with the
aforesaid lower part of fire-box.
And in order that this Invention may be more fully understood I will now
proceed to describe the same with reference to the accompanying Sheet of Drawings,
of which Figure 1 is a front elevation of a boiler constructed according to this
Invention; Figure 2, a longitudinal section; Figure 3, a back end view; Figure 4,
a vertical cross section through A, A, Figure 2; and Figure 5, a horizontal section
taken through the fire-box and back uptake.
The fire-box A is made of a peculiar section, the upper part being circular, and its
lower part being struck with a larger radius, in this case following the outline of
the back uptake B concentric with the boiler shell C, as shown most clearly at
Figure 4. A much larger fire-box heating surface is thus obtained than heretofore in
similar constructions. The back uptake B is in one with the fire-box A, and also
with the front plate C₁ of the shell C. The return tubes D are fixed in the tube
plate of the back uptake B and in the front plate C. The front plate C¹; the
fire-box A, the back uptake B, and the tubes D thus form one whole and separate
structure, which is bodily inserted into the shell C, and is united thereto by means
of bolts and nuts. The front plate C¹ is thus united to the shell by means of bolts
passing through an angle iron riveted around the front of the shell C, as here
shown, or it may be a flange formed round the front of the shell. The back of the
uptake B is similarly united to the back plate C2 of the shell by means of bolts and
nuts; these latter bolts serve as stays to prevent bulging of these two flat surfaces.
The top and other parts of the back uptake may be stayed by bars or other well
known means, as required.
To the lower part of the fire-box are on each side riveted five square blocks d,
which by means of transverse strips or sweeps e of plate iron are united to two lon-
gitudinal ribs, which rest on the lower inner part of the shell, and facilitato the
drawing out and pushing in of the inside removable part of the boiler; these sweeps
and ribs also serve to stay the lower part of the fire-box.
And having thus fully described this Invention, and a mode of carrying the same
into effect, I declare that I do not claim the uniting the inner removable part of a
boiler to the shell by means of bolts and nuts, as this in itself is not new, but I
claim as the herein-before described improvements in the construction of steam
boilers, forming the front plate, fire-box, back uptake, and return tubes of return

page_text: tube boilers as a whole and separate structure removably united to the outer shell
by means of bolts and nuts, all substantially as herein described.
In witness whereof, I, the said Peter Jensen, have hereunto set my hand and
seal, this Twenty-ninth day of September, in the year of our Lord One
thousand eight hundred and seventy-six.
PETER JENSEN. (L.S.)