A New or Improved Method of Manufacturing Seamless Metal Tubes. and Tubular Bodies
Year: 1894

page_text: Date of Application, 12th Feb., 1894-Accepted, 21st Apr., 1894
COMPLETE
SPECIFICATION.
A New or Improved Method of Manufacturing Seamless Metal Tubes.
and Tubular Bodies.
We, OSCAR FRIEDRICH and WILHELM SCHULTE, both of Duisburger
Eisen & Stahlwerke, Duisburg, Rhine Province, Prussia, in the Empire, of
Germany, Iron and Steel Workers, do hereby declare the nature of this inven-
tion, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
The invention has for its object a New or Improved Method of Manufacturing
Seamless Metal Tubes and Tubular Bodies with or without longitudinal ribs, and
for manufacturing tubular metallic bodies of any profile corresponding to their
application and use, and consists first, in forming tubular bodies, by casting or in
any convenient way, of rollable or malleable material, then, according to their
required dimensions and thickness of their sides, compressing them in a rolling mill
or forging them into the form of a ribbon or band, and finally, after slightly
opening out the end of this band or ribbon, drawing it over a mandrel by means of
rollers or in a draw bench. In such manner the bands or ribbons are brought to
the required profile and to the length and side thickness required for their
intended use.
Figs. 1 and 2 of the accompanying drawing show in what manner the flat double
ribbon a, coming out of the furnace and passing through or under a guide e, is
carried to the rollers or to the draw bench.
The material, having been opened a little at its fore end so as to enable the
mandrel between the rollers c and d to penetrate with its pointed end into the
opened slit, is slidden or drawn by the rollers c and d over this mandrel b and
leaves, in the form and profile fixed by the rollers, as a tube or a tubular body..
The designation "tubular body" has been chosen as applicable to the profiles
represented in Figs. 5, 6, 7 and 8, 9, 10, and to similar ones which can likewise be
manufactured by means of the same process, and which, in consequence of their
tubular form, may be applied as elementary bodies of construction, bearers or rails,
and they may also be used for carrying conducting cables or smaller tube conductors
for different purposes.
The simplest form of tube is shown in Fig. 3, and is provided with two longi-
tudinal ribs, which are larger or smaller according to the original thickness of the
rolled or forged band or ribbon; these ribs are very useful for the fitting of long
conduits as they afford not only a high degree of stability, but also because they
can be placed with their ribs directly upon walls or other supports. But if it is
desired to produce tubes without longitudinal ribs, such as boiler tubes, these
longitudinal ribs are cut off where indicated by dotted lines in Fig. 3, and the tubes
are submitted to a second operation between rollers or on the draw-bench, after
which they appear as a plain circular tube.
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 new or improved process of manufacturing seamless tubes and tubular bodies,
with or without longitudinal ribs, from annular metal bodies of any required section
produced by casting or otherwise, which, in order to get the required dimensions,
are rolled out or forged into a long double ribbon or band, which is slidden or

page_text: drawn over a mandrel either by means of rollers or in a draw bench, substantially
as herein shown and described.
Dated this 12th day of February 1894
OSCAR FRIEDRICH,
WILHELM SCHULTE,
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.