An Improved Method of Forming Flanges or Projections on Tubes and the like, and Apparatus therefor.
Year: 1895

page_text: Date of Application, 13th Apr., 1895
Complete Specification Left, 21st July, 1895-Accepted, 24th Aug., 1895
PROVISIONAL SPECIFICATION.
An Improved Method of Forming Flanges or Projections on Tubes
and the like, and Apparatus therefor.
I, FRANZ FUHRMANN of Düsseldorf in the Empire of Germany, do hereby
declare the nature of this invention to be as follows:-
When a hollow body such as an iron tube is placed on a mandril and chucks are
moved in opposite directions against it, the hollow body is bulged out towards the
outside and if the approachment of the chucks is continued, finally takes the form
of a double flange. If the length of the hollow body in proportion to its diameter
be large there is usually formed more than one bulge.
This peculiarity can be turned to account for various purposes.
If we take by way of example a steel or iron tube and clamp the same fast by
means of a chuck and insert in the same a mandril with a boss and propel the
mandril against the end of the tube there is formed at the end of the tube a bulge,
double-fold or double-flange. By a prolongation of the rim of the chuck there is
formed an enclosed mould within which the boss of the mandril slides forming a
matrix for the double flange to be pressed whereby the precision of the operation
is increased.
If the chuck receives a shaped contour any desired convex or concave impressions
may be made in the flange. For instance a flange junction with impressed stuffing
groove to hold the washer or stuffing material may be made.
These terminal flanges are applicable not only to the joining of pipe lengths but
can also be employed for adapting tubes for pillars and building supports.
If a tube be provided with more than one bulge or projection it can expand
longitudinally and can serve as a compensating tube.
Exactly in like manner as the above described method of bulging out a tube by
an inserted mandril, tubes can be impressed or bent inwards from the outside by a
corresponding device applied from the outside.
Dated this 13th day of April 1895.
W. P. THOMPSON & Co.,
31, High Holborn, London, W.C., Patent Agents for the Applicant.
An Improved Method of Forming Flanges or Projections on Tubes
and the like, and Apparatus therefor.
!, FRANZ FUHRMANN of Düsseldorf in the Empire of Germany, do hereby
declare the nature of this invention aud in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
When a hollow body such as an iron tube 6 Fig. 1 is placed on a mandril a and
chucks c c and d d are moved in the direction of the arrows, the hollow body is
bulged out towards the outside Fig. 2 and if the approachment of the compressors
is continued, finally takes the form shewn in Fig. 3. If the length of the

page_text: hollow body in proportion to its diameter be large, there is usually formed more
than one bulge.
This peculiarity can be turned to account for various purposes.
Referring to the accompanying drawings,...
Fig. 1 shews a hollow body before compression.
Fig. 2 the same partly and
Fig. 3 entirely compressed.
Figs. 4, 5, and 6 the formation of a flange by means of a mandril.
Figs. 7, 8, 9 and 10 different shapes produced by this process.
If we take by way of example a tube b Fig. 4 and clamp the same fast by means
of the chucks c c and insert in the same the mandril a with the boss d and propel
the mandril in the direction of the arrow there is formed at the end of the tube a
bulge, double-fold, or double-flange Figs. 5 and 6. By the prolongation of the
matrices e forwards there is formed an enclosed mould for the double flange to be
pressed whereby the precision of the operation is increased.
If the chuck d receives a shaped. contour any desired convex or concave
impressions may he made in the flange. Fig. 7 shews a flange junction with impressed
stuffing groove to hold the washer or stuffing material.
These terminal flanges are applicable not only to the joining of pipe lengths but
can also be employed for adapting tubes for pillars and building supports.
If a tube be provided with more than one bulge or projection it can expand
longitudinally and can serve as a compensating tube. Exactly in like manner as
the above described method of bulging out a tube by an inserted mandril, tubes
can be impressed or bent inwards from the outside by a corresponding device applied
from the outside Figs. 8, 9, 10.
1
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The process for forming projections, expansions or contractions in tubes and
the like by submitting them to pressure in the direction of their axis substantially
as described and illustrated in the accompanying drawings.
2. In the process above set forth, the use of a mandril for effecting the expansion
of tubes or the like substantially as described.
3. The combination of parts consisting essentially of chuck or block d provided
with mandril a together with the shaped matrix c substantially as and for the
purposes described.
Dated this 21st day of June 1895.
W. P. THOMPSON & Co.,
31, High Holborn, London, W.C., Patent Agents for the Applicant.