provements in the Construction of Cylinders for Drying Paper in Paper-making Machines, and for like purposes.
Year: 1894

page_text: Date of Application, 29th Dec., 1894
Complete Specification Left, 27th June, 1895-Accepted, 27th July, 1895
PROVISIONAL SPECIFICATION
Improvements in the Construction of Cylinders for Drying Paper in
Paper-making Machines, and for like purposes.
I, JOHN WHITE, of the Firm of James Bertram and Son, Limited, of Leith
Walk Foundry, Edinburgh, in the County of Mid-Lothian, North Britain,
Engineer, do hereby declare the nature of this invention to be as follows, that is
to say
My said invention relates to drying cylinders for paper-making machines, and is
also advantageously applicable in the construction of any cylinders subjected to great
changes of temperature or to other actions tending to render their joints defective.
A cylinder of the kind to which my invention is applicable is commonly made with
a cylindrical castiron shell closed by end disks having hollow trunnions by means
of which the cylinder is carried and through which steam is introduced to heat the
cylinder, and my invention has more particularly to do with the joints between
the cylindrical shell and the end disks, my improvements being also applicable
when the cylindrical shell is cast with annular portions of the end disks, and
otherwise
"
In carrying out my invention according to one modification, I have the
cylindrical shell cast with an inwand flange at each end and at a short distance
wards from the end. At the outer face of the flango and at its inner edge a
projecting rib is formed, and 18 made to accurately lit the inside of an inward
flange formed on the end disk. The outside of the flange on the end disk is
comical and a counterpait conical recess is formed in the inside of the part of the
cylindrical shell extending beyond the flange of the shell. The conical recess of
the cylindrical shell is at its outer edge, which is smallest in diameter, just large
enough to admit the larger inuer edge of the couteal flauge of the end disk, and
when the end disk is in position there is an annular conical space between the two
comical surfaces. The comical surfaces are by preference made such that the
annular space between them is slightly wide at its inner part A suitable
mntenal preferably metallic, is forced into the annulai comical space, with or
without segmental keys, and the material is caulked or driven in to fill the inner
part of the space, and to assume a dovetail form fitting the inner slightly wider
part of the space
In the manner described a secure and tight joint is formed, capable of withstanding
considerable pressure, and not liable to be rendered leaky by the action of steam
or of impurities such as often accompany the steam especially when exhaust steam
from an engine is used.
When the cylindrical shell is cast with annular ends the trunnions with flanges
or small disks formed on them may be jointed to the annulat ends in a similar way;
and manhole doors may also be similarly secured. In some cases a steel or
wrought iron ring may be shrunk on in a groove formed for it round the extreme
edge of the cylindrical shell, or round a neck Range formed on an annular
end disk.
Instead of shaping the ends of the cylindrical shell and the flanges of the end
disks so as to form conical joint spaces, ther may be shaped so as to form cylindrical
Joint spaces to be caulked like the comical joint space, the end disks being, in this

page_text: modification bolted to the internal Aanges of the cylindrical shell whilst the parts
are otherwise as in the first-described modification.
Dated this Twenty-eighth day of December 1894.
EDMUND HUNT,
Applicant's Agent.
Improvements in the Construction of Cylinders for Drying Paper in
Paper-making Machines, and for like purposes.
I, JOHN WHITE, of the Firm of James Bettram and Son, Limited, of Leith
Walk Foundry, Edinburgh, in the County of Mid-Lothian, North Britain,
Engineer, do hereby declate 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, that is to say
My said invention relates to drying cylinders for paper-making machines, and
is also advantageously applicable in the construction of any cylinders subjected
to great changes of temperature or to other actions tending to render then joints
defective. A cylinder of the kind to which my invention is applicable is commonly
made with a cylindrical castiron shell closed by end disks having hollow trunnions
by means of which the cylinder is carried and though which steam is introduced
to heat the cylinder, and my invention has more particularly to do with the
Joints between the cylindrical shell and the end disks, my improvements being
also applicable when the cylindrical shell 18 cast with annular portions of the
end disks, and otherwise
In caying out my invention, according to one modification I have the
cyndical shell cast with an inward flange at each eud and at a short distance
inwards from the end. At the outer face of the flange and at its muer edge a
projecting b is formed and is made to accurately fit the inside of au inward
Hango formed on the end disk. The outside of the flange on the end disk 18
comical and a counterpart conical recess is formed in the inside of the part of
the cylindrical shell extending beyond the flange of the shell. The conical
recess of the cylindrical shell is at its outer edge, which is smallest in diameter,
Just large enough to admit the larger ner edge of the conical flaage of the
end disk; and when the end disk is in position there is an annular comical space
between the two conical surfaces The comical surfaces may be smooth or serrated
and are by preference made such that the annulat space between them is slightly
wide at its inner part. A suitable material preferably metallic, is forced or run
in a molten state into the annului conical space, with or without segmental keys,
and the material is, il necessary, caulked on diven in to fill the inner part of
the space, and to assume a dovetail form when the space is wider at its inner part.
In another modification the joint spaces nie made cylindrical instead of conical
and the end disks are bolted to the cylindrical shell.
And in order that my said invention and the manner of performing the same may
be properly understood I her cunto append a sheet of explanatory drawings, to be
hereafter referred to, and showing some modifications of my improvements.
Figures, 1, and 2, of the drawings are horizontal sections of two modifications.
Figure, 3, 18 an enlarged horizontal section of a part of the modification shown
in Figure, 2.
Figure, 4, 1s a horizontal section of a part of another modification.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
In the modifications shown in Figures, 1, 2, and, 3, the cylindrical shell, A, is
cast with an inward flange, B, at each end, and at a short distance inwards from

page_text: the end. At the outer face of the flange, B, and at its inner edge a projecting
ib, C, is formed and is made to accurately fit the inside of an inward flange, D,
formed on the end disk, F. The outside of the flange, D, on the end disk, F, is
comical; and a counterpart conical recess is formed in the inside of the part, J, of
the cylindrical shell, A, extending beyond the flange, B, of the shell. The comical
recess of the cylindrical shell, A, is at its outer edge, which is smallest in diameter,
Just large enough to admit the large inner edge of the conical flange, D, of the end
disk, F; and when the end disk is in position there is an annular conical space
between the two conical surfaces. These conical sufaces are serrated in the
nodifications delineated A suitable material, E, preferably metallic, is forced or
run into the annular couical space, and the material is, if necessary, caulked or
driven u to fill the inner part of the space. As shown in Figures, 2, and 3,
nereased strength may be obtained by shrinking on a steel or wrought iron
ng, G, in a groove formed for it sound the extreme edge of the cylindrical
shell, A, or it might be round a neck flange formed on an angular end disk The
end disks, F, may be stayed by rods, II, screwed into them and joined by night and
left screw nuts.
In the manner described a secure and tight joint is formed, capable of with-
standing considerable pressure, and not able to be rendered leaky by the action
of steam o of impurities such as often accompany the steam especially when
exhaust steam from an engine is used.
As an additional security the cover, F, may be fixed to the flange, B, by internal
ud bolts, K, as shown in Figure, 4, hereinafter described.
Instead of shaping the ends, J, of the cylindrical shell, A, and the flanges, D, of
the end disks, F, so as to form conical joint spaces, they may be shaped so as to
form cylindrical joint spaces (as shown in Figure 4) to be caulked like the conical
joint space, the end disks, F, being in this modification fixed by stud bolts, K, to
the internal flanges, B, of the cylindrical shell, whilst the parts are otherwise as in
the first described modification. Instead of stud bolts, headed bolts may be
used, the end disk, F, being cast with internal sockets for the headed ends of the
bolts without perforating the cover.
Ilaving now particularly described and ascertained the nature of my said inven-
tion and in what mauuct the same is to be performed, I declare that what I
clum is
-
1. In the construction of cylinders for drying paper in paper-making machines
and for like purposes. the fixing of disks to the cylinder ends by means of an
improved joint formed by applying suitable packing material in a joint space of
comical shape with serrated o1 smooth sides, the cylinder ends and the disks being
made with flanges o check hs fitting each other, substantially as herein before
described.
2 The modification of the improved joint in which the joint space is made
cylindrical and the joint is combined with bolts, studs, or stays without perforating
the cover substantially as herembefore described.
Dated this Twenty-sixth day of June 1895.
EDMUND JIUNT,
Applicant's Agent.