Improvements in and connected with the Flanging of Pipes and Tubes.
Year: 1896

page_text: Improvements in and connected with the Flanging of Pipes and
Tubes.
I, GEORGE FREDERICK REDFERN, of the Firm of G. F. Redfern & Co.,
The General Patent Office, No. 4, South Street, Finsbury, in the County of
London, Patent Agents, do hereby declare the nature of this invention (a
communication to me by Franz Fubrmann, of 83, Bismarckstrasse, Düsseldorf,
in the German Empire, Clerk) to be as follows:-
This invention relates to improvements in and connected with the formation of
double or folded flanges on pipes and tubes.
In the manufacture of double or folded flanges on tubes or pipes by the
employment of a mandrel having a head which folds the end of the tube, it has been
found that the flange is frequently not properly formed that is to say, that the fold
of the tube is not made exactly in the middle of the projecting end of the same,
or is inclined so that at some points on the circumference the inner edge of the
folded flange is forced farther inwards than at other points.
According to this invention, in order to avoid such imperfect results, the head
of the mandrel is provided with an annular groove into which the end of the tube
can be inserted so as to be firmly held in position until the flange is completely
formed. By this means a defective flange is avoided. The projecting end of the
tube can also be cut off exactly at right angles to the axis of the tube so that
the ends of two tubes, when being connected up, fit together so as to make a good
joint.
The head is preferably recessed so that the folded flange when finished is
completely enclosed.
In some cases instead of forming the head solid with the mandrel a loose head
is provided one portion of which is reduced in diameter, the said reduced portion
being adapted to be inserted into the jaws holding the tube or pipes. This loose
head is, during the formation of the flange, forced forward by means of a collar
or fixed head on the mandrel. When the mandrel is drawn back the loose head
is held in position by suitable means to prevent the pipe or tube from being
carried backwards with the mandrel so that damage to the flange is avoided.
In both cases the jaws holding the pipe or tube are loosened when the flange is
formed so that the tube can be removed from the apparatus.
G. F. REDFERN & Co.,
4, South Strect, Finsbury, London, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with the Flanging of Pipes and
Tubes.
I, GEORGE FREDERICK REDFERN, of the Firm of G. F. Redfern & Co., The
General Patent Office, No. 4, South Street, Finsbury, in the County of London,
Patent Agents, do hereby declare the nature of this invention (a communication
to me by Franz Fuhrmann, of 83, Bismarckstrasse, Düsseldorf, in the German
Empire, Clerk,) and in what inanner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention relates to improvements in and connected with the formation of
double or folded flanges on pipes and tubes.
In the manufacture of double or folded flanges on tubes or pipes by the
employment of a mandrel having a head which folds the end of the tube, it has
been found that the flange is frequently not properly formed, that is to say, that
the fold of the tube is not made exactly in the middle of the projecting end of the
same, or is inclined so that at some points on the circumference the inner edge of
the folded flange is forced farther inwards than at other points.
According to this invention, in order to avoid such imperfect results, the head
of the mandrel is provided with an annular groove into which the end of the tube
can be inserted so as to be firmly held in position until the flange is completely
formed.
In the accompanying drawing:-
Figure 1 is a section of a portion of a pipe having an imperfect flange.
Figure 2 is a sectional view of my mandrel with a pipe in position for
flanging.
Figure 3 is a similar view shewing the flange formed on the pipe.
Figure 4 is a section of a portion of a pipe flanged according to my invention.
Figure 5 is a sectional view shewing two pipes connected together by their
flanges.
Figure 6 is a sectional view of a modified form of mandrel and head.
a is the mandrel, d the head of the same and i the annular groove formed in
the head d into which the end of the tube b enters, as shewn in Figure 2,
so as to be firmly held in position until the flange is formed as shewn in
Figure 3.
The projecting end n of the tube b,
angles to the axis of the tube in the
being connected up, fit together so
B
By this means a defective flange is avoided.
Figure 4, can also be cut off exactly at right
plane so that the ends of two tubes, when
as to make a good joint as shewn in Figure 5.
The head is preferably recessed leaving projecting portion as shewn at f
Figure 2, so that the folded flange when finished is completely enclosed.
In the arrangement shewn in Figure 6 instead of forming the head d solid
with the mandrel a a loose head 9 is provided one portion of which is reduced
in diameter, the said reduced portion being adapted to be inserted into the jaws c
holding the tube or pipe. This loose head g is, during the formation of the flange,
forced forward by means of a collar or fixed head d' on the mandrel a.
the mandrel a is drawn back the loose head g is held in position by suitable
means to prevent the pipe or tube from being carried backwards with the
mandrel so that damage to the flange is avoided.
Wher
In both cases the jaws holding the pipe or tube are loosened when the flange is
formed so that the tube can be removed from the apparatus.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. In the formation of double or folded flanges on pipes and tubes by means
of a mandrel having a head for folding the end of the pipe or tube, the arrange-
ment of a groove in the said head of the mandrel for the purpose of firmly
holding the end of the pipe or tube during the operation of flanging.
2. In apparatus of the kind described in Claim 1 the arrangement of a loose
head to the mandrel, which head holds the flanged pipe or tube and prevents
injury to the flange whilst the mandrel is being withdrawn from the pipe or
tube.
3. The improvements in and connected with the flanging of pipes and tubes
hereinbefore described and illustrated in the accompanying drawings.
Dated the 3rd day of December 1896.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.