Improvements in Pipe Joints and in Apparatus to be used in Making the same.
Year: 1891

page_text: Date of Application, 23th Mar., 1891
Complete Specification Left, 23rd Dec., 1891-Accepted, 6th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Pipe Joints and in Apparatus to be used in Making
the same.
We, ANDREW EADIE, and JOHN TANNAHILL, of the Clydesdale Tube Works,
Rutherglen, in the County of Lanark, North Britain, Tube Manufacturers, do
hereby declare the nature of this invention to be as follows, that is to say:-
Our said invention has for its object to improve the joints by which wrought-iron
or steel pipes are united, and especially, where required; to make them capable of
withstanding high pressures.
In carrying out our invention each end of a pipe length has formed on it a flange
which whilst projecting outwards to only a moderate extent is made as thick or
thicker than the body of the pipe. The apparatus employed comprises a pair of
special dies acted on by the ram of an hydraulic cylinder. One die is made with a
central projecting mandril to enter the end of the pipe or tube, and with a shoulder
or larger part of the diameter of the intended flange. The second die has a central
bore fitting the pipe, and a larger cylindrical part into which the larger part of the
other die can enter. The pipe is entered so as to project through the bore of the
second die to an extent giving as much metal as will form the intended thickened
flange, and on compression of the dies being effected, the pipe end, being in a
suitably heated state, becomes flanged as desired. The second die may be shaped
so as to give a tapering thickening to the body of the pipe close to the flange.
The joint between two pipe ends is completed by joint rings which are bolted
together with the flanges between them, one of the rings being by preference made
with a projecting part which enters a recess in the other ring.
Dated this Twenty-sixth day of March 1891.
EDMUND HUNT,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Pipe Joints and in Apparatus to be used in Making
the same.
We, ANDREW EADIE and JOHN TANNAHILL, of the Clydesdale Tube Works,
Rutherglen, in the County of Lanark, North Britain, Tube Manufacturers 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, that is to say :-
Our said invention has for its object to improve the joints by which wrought-iron
or steel pipes are united, and especially, where required, to make them capable of
withstanding high pressures.
In carrying out our invention each end of a pipe length has formed on it a flange,
which whilst projecting outwards to only a moderate extent, is made as thick as, or
thicker than the body of the pipe. This is effected, the pipe or tube having been
first sufficiently heated, by means of the ram of an hydraulic cylinder, and a pair
of special dies hereinafter described.
And in order that our said invention and the manner of performing the same
may be properly understood, we hereunto append a sheet of explanatory drawings,
to be hereinafter referred to, showing an example of our improved apparatus for
nine ioints.

page_text: r
Figure, 1, is a side view of one die, and Figure, 2, is a longitudinal section of the
other (or complementary) die, with the pipe or tube end in position for being
operated on.
Figure, 3, is a side view, and Figure, 4, is a longitudinal section of a flanged pipe
end.
Figure, 5, is a longitudinal section of a pipe joint with the parts finished and
united together.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
The end of a pipe length, A. has formed on-it a flange, B, which, whilst project-
ing outwards to only a moderate extent, is made as thick as, or thicker than the
body, C, of the pipe. The apparatus employed comprises a pair of special dies, D, E,
acted on by the ram of an hydraulic cylinder. One die, D, is made with a central
projecting mandril, F, to enter the end, G, of the pipe or tube, A, and with a
shoulder or larger part, H, of the diameter of the intended flange, B. The second
dic, E, has a central bore, J, fitting the pipe, A, and a larger cylindrical part, K,
into which the larger part, H, of the die, D, can enter. The pipe is fixed in the
die, E, to project through the bore, J, to an extent giving as much metal as will
form the intended thickened flange, B, and on compression of the dies, D, E, being
effected, the pipe end, G, being in a suitably heated state, becomes flanged as
desired. The second die, E, may be shaped so as to give a tapering thickening to
the body, C, of the pipe, A, close to the Hange, B.
The joint between two pipe ends, G, is completed by joint rings, L, M, which
are fixed together by bolts, N, with the flanges, B, between them, one of the rings, M,
being by preference made with a projecting part, P, which enters a recess, Q, in the
other ring, . A packing ring, R, of any suitable slightly compressible material
is placed between the flanges, B..
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :
The improved joint for uniting wrought-iron or steel pipes consisting of rings
bolted together and enclosing flanges or thickened projecting parts formed on the
pipe ends in the manner and by means of apparatus substantially such as is
hereinbefore described.
Dated this Twenty-second day of December 1801
EDMUND HUNT,
Applicants' Agent.