New or Improved Process for Manufacturing Pipes.
Year: 1899

page_text: Date of Application, 30th Oct., 1899-Accepted, 2nd Dec., 1899
COMPLETE SPECIFICATION (AMENDED).
New or Improved Process for Manufacturing Pipes.
I, ALBERT SCHMITZ, of Frankfurterstrasse 50, Raunheim on Main, in the
Empire of Germany, Engineer, 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 :-
This invention relates to a new or improved process for manufacturing pipes
from sheet metal or the like in such a manner that they have the same resistance
as seamless pipes. The process consists in forming two or more plates of sheet
metal into pipes lying one round and upon the other and of joining the edges
of each single plate intimately with one another and also each so formed pipe
with the neighbouring one lying within or without the same which junction
can be effected for instance by welding.
In taking care in the manufacture that the seams of the different pipes united
to one whole do not come upon each other, an absolutely tight pipe can be pro-
duced by this process even when the seams or junctions of the pipe walls lying
one round the other should not be faultless at some spots.
The improved process consists in the following:
A plate of metal a shown in Fig. 1 of the annexed drawings of suitable size
is formed to a pipe by drawing it through a funnel Fig. 2. If required
this may be done once or repeated several times. The thus produced pipe is
put on a second plate Fig. 3 and then the whole is pulled through a second
funnel e Fig. 4 by which the borders of dare bent thus forming it also into a
pipe.
The diameter of the second funnel e is such that in the pulling movement
pressure is brought to bear on the first pipe if possible. The walls of the second
pipe are consequently pressed with some force upon the walls of the already
finished pipe e and will therefore cling intimately fo them.
In putting on d care is taken that the seams of the formed pipe and the
pipe to be formed do not come upon one another, that is to say coincide.
A pipe f Fig. 5, is thus produced consisting of two pipes the one lying inside
the other and being in close contact on their whole surfaces whilst the seams are
at different places.
By repeating this process and putting more pipes upon the others the finished
article can be strengthened as much as desired.
It is then necessary to connect each pipe at the seam and the single pipes with
each other to one whole.
This can be done in different manners for instance by heating the whole to
welding temperature and drawing it then through a funnel or by rolling or press-
ing the parts in such a manner that a welding is effected..
But the welding can also be done at the beginning by heating the plates to

page_text: be made into pipes to welding temperature. The welding is then effected in
forming the pipe and the next one is directly welded on the preceding one.
Further the junction of the single pipe walls can also be effected by dipping
the pipe obtained by this process into a bath for instance of molten metal. The
latter penetrates then into the still open intermediate spaces filling the same
and setting therein when taken out of the bath, thus giving an intimate junction
of the parts together.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I wish it to be under-
stood that I am aware that it has been proposed to manufacture pipes or tubes
from strips formed into skelps, such skelps being nested together and subse-
quently heated and welded, or brazed or soldered, and I make no general claim
to the manufacture of pipes or tubes in this manner, but I declare that what
I claim is;
New or improved process for manufacturing pipes in which a suitable plate
is formed into a pipe by being drawn through a funnel, upon which so obtained
pipe a second plate is formed in the same way, this process being repeated as
often as desired, an intimate union of the single pipes being done by suitable
means.
உ
1
HERBERT HADDAN & Co.,
Agents to Applicant,
18, Buckingham Street, Strand, W.C.