IMPROVEMENTS IN THE CONSTRUCtion of STEAM BOILERS
Year: 1881

page_text: LETTERS PATENT to Henry Sharp, of Bolton, in the County of Lancaster,
Engineer, for an Invention of “IMPROVEMENTS IN THE CONSTRUCtion of
STEAM BOILERS."
PROVISIONAL SPECIFICATION left by the said Henry Sharp at the Office
of the Commissioners of Patents on the 6th December 1881.
HENRY SHARP, of Bolton, in the County of Lancaster, Engineer. " IMPROVE-
MENTS IN THE CONSTRUCTION OF STEAM BOILERS."
This Invention has for its object the constructing of steam boilers in an improved
manner, and consists principally in certain modes hereinafter described of joining
or uniting rings or short cylinders of steel to form the outer shells or internal flues
of the boilers, such rings or short cylinders being weldless and formed by well
known rolling processes.
In carrying out the Invention both surfaces of each joint are by preference
turned or bored, although in some cases it may be sufficient to turn or bore only
one of such surfaces. In some modifications the rings or short cylinders are rolled
with thickened parts or borders at the ends, the joint surfaces being formed on
such thickened parts; in other modifications the rings or short cylinders are made
without such thickened parts, and in still other modifications a thickened part on
one ring or cylinder forins a joint with an unthickened part on another. The
joints aro riveted after the parts have been put together, the rivet holos being by
preference drilled.
The rings or short cylinders are joined together so as to form continuous
cylinders or tubes of suitable lengths, and in one modification equal-sized main
rings or short cylinders have their ends abutting together and covered by com-
paratively narrow joint rings shrunk on, cach joint ring being riveted to the two
cylinder ends which it covers.
In a second class of modifications the main rings or short cylinders are made so
that the end of one can be entered into the end of another a sufficient distance for

page_text: forming the joint and for being riveted together. The cylinders may be of two
slightly different sizes combined, so as to alternate one with the other through the
length of the boiler, and each smaller cylinder having its ends entered into the
ends of the larger cylinders on each side of it; or the cylinders, the ends of which
are outside, instead of being entirely of the larger size, may be slightly larger at 5
their ends then at their main or middle parts; or again, all the cylinders may be of
uniform size as regards their main or middle parts, but with enlarged and reduced
ends for the joints, so that a reduced end on one cylinder may enter an enlarged
end on the next.
In another modification the series of rings or cylinders forming the boiler shell 1
or flue are of graduated sizes, each fitting into a larger one at one end and over
a smaller one at the other end.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henry Sharp in the Great Seal Patent Office on the 2nd June
1882.
HENRY SHARP, of Bolton, in the County of Lancaster, Engineer.
MENTS IN THE CONSTRUCTION OF STEAM BOILERS."
"IMPROVE
My said Invention has for its object the constructing of steam boilers in an
improved manner, and consists principally in certain modes hereinafter described of
joining or uniting rings or short cylinders of steel to form the outer shells or
internal flues of the boilers, such rings or short cylinders being weldless and
formed by well known rolling processes.
In carrying out my Invention both surfaces of each joint are by preference
turned or bored, although in some cases it may be sufficient to turn or bore only
one of such surfaces. In some modifications the rings or short cylinders are rolled
with thickened parts or borders at the ends, the joint surfaces being formed on
such thickened parts; in other modifications the rings or short cylinders are made
without such thickened parts, and in still other modifications a thickened part on
one ring or cylinder forms a joint with an unthickened part on another. The
joints are riveted after the parts have been put together, the rivet holes being by
preference drilled.
#
The rings or short cylinders are joined together so as to form continuous
cylinders or tubes of suitable lengths, and in some modifications equal-sized main
or broad rings or short cylinders have their ends abutting together and covered by
comparatively narrow joint rings shrunk on, each joint ring being riveted to the
two cylinder ends which it covers.
And in order that my said Invention and the manner of performing the same
may be properly understood, I hereunto append a Sheet of explanatory Drawings
to be hereinafter referred to and representing examples of my improved con-
structions. In these Drawings the same reference letters and numerals are used
to mark the same or like parts wherever they are repeated.
Figures 1 and 2 on the accompanying Sheet of Drawings are an end elevation
and a longitudinal vertical section of steam boiler as made with one modification
of my improvements. This boiler is of a horizontal cylindrical form with flat
vertical ends, and is represented as made with three large tubes A at its lower part
for furnaces, whilst there may be small tubes at a higher part of it, as in some
existing boilers. My present Invention relates principally to the external
cylindrical shell of the boiler, which consists in this example of four broad rings
or short cylinders B of steel, each ring being formed without a weld by well known
rolling processes. The broad rings B have their edges abutting against each other
and covered by joint rings C, which are riveted each to each of the broad rings B,
the edges of which it covers; Figures 3 and 4 are enlarged sections showing
modifications of joint which may be used in the construction of boiler shells, such
as that shown in Figures 1 and 2.
In the modification shown in Figure 3, each broad ring B is rolled with a
thickened border or part 12 at each edge to receive the joint ring C, and such
borders 12 are by preference turned to secure close fitting between them and the
insides of the joint rings C, which latter may be bored for the same purpose.
In the modification shown in Figure 4 the broad rings B are made without
thickened borders, whilst the joint rings C are made with such borders, or in other
words, with shallow grooves 13 at the middles of their inner sides.
In a second class of modifications the main or broad rings or short cylinders B

page_text: are made so that the end of one can be entered into the end of another a sufficient
distance for forming the joint and for being riveted together. The cylinders B
may be of two slightly different sizes combined, so as to alternate one with the
other through the length of the boiler, and each smaller cylinder having its ends
entered into the ends of the larger cylinders on each side of it, as shown in
Figures 5, 6, and 7. The cylinders B may be made with thickened borders 14 on
both sizes, such borders being on the inner side of the larger cylinders and on the
outer side of the smaller cylinder, as shown in Figure 5, or such thickened borders
may be formed only on the smaller cylinders, as shown at 15, in Figure 6, or only
the larger cylinders, as shown at 16 in Figure 7.
Or, as is shown in Figure 8, the cylinders D, the ends of which are outside of the
other cylinders B, instead of being entirely of the larger size, may be rolled slightly
larger at their edges 17 than at their main or middle parts; or again all the
cylinders may be of uniform size as regards their main or middle parts, but with
enlarged and reduced ends or edges 18, 19, for the joints, as shown in Figures 9
and 10, so that a reduced edge or end 19 on one cylinder may enter an enlarged
edge or end on the next.
In another modification shown in Figure 11, the series of rings or cylinders E,
F, G, &c., forming the boiler shell or flue are of graduated sizes, each fitting into a
larger one at one end and over a smaller one at the other end.
Having thus particularly described my said Invention and the manner of
performing the same, I have to state that I do not restrict myself to the precise
details herein described or delineated, but that what I believe to be novel and
original and claim as the Invention secured to me by and in terms of the
hereinbefore in part recited Letters Patent is,―
The constructing of the shells or flues of steam boilers with weldless broad rings
or short cylinders of steel, such rings being joined or united in any of the improved
modes herein before described.
In witness whereof, I, the said Henry Sharp, have hereunto set my hand
and seal, this Thirtieth day of May, in the year of our Lord One
thousand eight hundred and eighty-two.