Improvements in the Method of Drawing Steel and other Metallic Tubes.
Year: 1895

page_text: Date of Application. 5th Feb., 1895
Complete Specification Left, 27th Aug., 1895-Accepted, 5th Oct.. 1895
PROVISIONAL SPECIFICATION.
Improvements in the Method of Drawing Steel and other Metallic
Tubes.
I, JAMES HUDSON, the younger, of
Monument Road, in the City of
Birmingham, Tube Manufacturer do hereby declare the nature of this invention to
be as follows:-
Hitherto it has been the custom to draw tubes over a plug, and through a die,
but by this method the tubes frequently break, and much waste is made.
My improved method is to draw the tube on a maundril and afterwards by means
of suitable rolls to loosen the tube on the maundril, and draw the said maundril
out. The rolls are constructed by preference as follows: They may be two or more
in number but when two are used in the upper and lower rolls I turn indentations
sufficiently deep to receive about one third of the tube each, the corners or edges
of each indentation being carefully rounded off, the said rolls are held in the desired
position by a suitable frame and set screws.
As a modification of my invention I sometimes employ three or more rolls, and
when necessary I make the indentations therein at a slightly greater radius than
that of the tube to be acted upon.
When the tube is drawn to the desired thickness it is passed through the before
described rolls, it is then, if necessary, turned one fourth way round, or partly round
as the case may require, and passed through the rolls a second time, these
operations are found to loosen the tube on the maundril which can then be easily
removed.
By my improved method much labor and cost is saved, and a superior tube is
produced.
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...
1.
1005
Improvements in the Method of Drawing Steel and other Metallic
Tubes.
I, JAMES HUDSON, the younger, of 5 Monument Road, in the City of
Birmingham, Tube Manufacturer, do hereby declare the nature of this invention
and in what manner the same is to be perforined, to be particularly described and
ascertained in and by the following statement :-
Hitherto it has been the custom to draw tubes over a plug, and through a die,
but by this method the tubes frequently break and much waste is made.
My improved method is to draw the tube over a maundril, and afterwards by
means of suitable rolls to loosen the tube on the maundril, and draw the said
maundril out. The rolls are constructed by preference as follows: They may be
two or more in number, but when two are used in the upper and lower rolls I turn
indentations sufficiently deep to receive about one third of the tube each, the
corners or edges of each indentation being carefully rounded off, the said rolls are
DO77

page_text: held in the desired position by a suitable frame and set screws. As a modification
of my invention I sometimes employ three or more rolls, and when necessary I
make the indentation therein at a slightly greater radius than that of the tube to
be acted upon. When the tube is drawn to the desired thickness it is passed
through the before described rolls, it is then, if necessary, turned one fourth way
round, or partly round, as the case may require, and passed through the rolls a
second time, these operations are found to loosen the tube on the maundril which
can then be easily removed. By my improved method much labour and cost is
saved, and a superior tube is produced.
That my invention may be better understood I have annexed drawings thereof
which will now proceed to describe:
Fig. 1 is a frame containing two rolls. Fig. 2 is a plan of the same.
Fig. 3 is a frame containing four rolls, and Fig. 4 is a
plan thereof.
Similar letters of reference denote the same parts in all the figures.
A A is the frame for holding the rolls in position. B are the set screws for
adjusting the rolls to their relative position. C are the rolls having suitable
indentations turned therein. D are the sliding carriers in which the rolls revolve.
E is a section of a tube passing through the rolls. F is a section of the maundril
upon which the tube has been drawn.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
The use of two or more rolls set in a frame and revolving within sliding carriers
and capable of adjustment by set screws for swaging or loosening tubes drawn upon
maundrils, substantially as and for the purpose hereinbefore set forth, and shewn in
the drawings.
Dated the 23rd day of August 1805
JAMES HUDSON, Jr.