Improvements relating to the Manufacture of Tubes.
Year: 1896

page_text: Date of Application, 20th Apr., 1896
Complete Specification Left, 7th May, 1896-Accepted, 13th June, 1896
PROVISIONAL SPECIFICATION.
Improvements relating to the Manufacture of Tubes.
I, JAMES HUDSON, of 187, Monument Road, in the City of Birmingham,
Gentleman, do hereby declare the nature of this invention to be as follows:-
This invention consists of improvements relating to the manufacture of tubes, my
object being to provide simple and effectivo means for removing the tube from the
drawing down bar after the metal has been reduced to the required gauge or
thickness without bruising or damaging either the bar or the tube.
In carrying my invention into effect I place the tube requiring to be drawn down
upon a bar or mandril of any ordinary form, and draw both tube and mandril
together through the die or dies upon a tube-bench or like machine arranged in the
usual manner. After the tube and mandril have been thus drawn together through
the die I remove the die and die block from its working position, and replace it with
an extractor block having a die mounted thereon.
The extractor die is formed preferably in two parts, and I provide suitable
screws upon the block for adjusting the relative position of such parts. When set
at their working positions the adjacent edges of the two parts of the die do not
touch or meet, but have a space between them. The front edges of the die parts
are well rounded to admit the tube, and the longitudinal edges are treated in like
manner to prevent any cutting or damage to the exterior surface of the tube. The
interior diameter of the die when the two parts are sot in their working position is
Bomewhat less than the external diameter of the tube which has been passed through
the drawing down die.
On drawing the tube and bar through the extractor die the top and bottom
portions of the tube metal in contact with the die are subjected to compression, and
such compression forces out the sides of the tube into the spaces between the two
die parts. After the tube has been thus once drawn completely through the
extractor die, I slightly increase the diameter of the dio by means of the adjustment
screws hereinbefore described, and I then turn the tube through a right angle in
order to bring its larger diameter of the pressed out sides into contact with
the die. The tube is then drawn a second time through the extractor die,
with the result it is so loosened as to permit of its ready withdrawal from the bar
or mandril.
I do not limit the application of my invention to the manufacture of tubes of any
particular metal, but adapt the same with such modifications as may be necessary
in the manufacture of tubes for varying services or requirements.
Dated this 18th day of April 1896.
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birminghain, Agents for the Applicant.

page_text: Improvements relating to the Manufacture of Tubes.
I, JAMES HUDSON, of 187, Monument Road, in the City of Birmingham,.
Gentleman, 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 consists of improvements relating to the manufacture of tubes, my
object being to provide simple and effective means for removing the tube from the
drawing down bar after the metal has been reduced to the required gauge or
thickness without bruising or damaging either the bar or the tube."
In the accompanying sheet of explanatory drawings to be hereinafter
referred to,--
Figure 1 is a front elevation, Figure 2 an end elevation, and Figure 3 a plan
illustrating my tube withdrawing appliance.
Figures 4 and 5 are sectional views to a larger scale of the tube and bar,
illustrating the process of withdrawal.
The same reference letters in the different views indicate the same parts.
In carrying my invention into effect I place the tube requiring to be drawn down
upon a bar or maudril of any ordinary form, and draw both tube and maudril
together through the die or dies upon a tube-bench or like machine arranged in
the usual manner. After the tube and mandril have been thus drawn together
through the die I remove the die and die block from its working position, and
replace it with an extractor or withdrawing block A having a die mounted
thereon.
The extractor or withdrawing die is formed preferably in two parts or segments
such as B B, and I provide suitable screws C'C' upon the block for adjusting the
relative positions of such parts. When set at their working positions the adjacent
edges of the two parts B B of the die do not touch or meet, being kept apart
preferably by the distance pieces D D', but a space d d' is left at each side of the
die, as illustrated at Figure 1. Lateral or side movement of the die parts B B¹
and the distance pieces D D' is prevented by the ribs E E'.
The front edges of the die parts B B are well rounded to admit the tube, aud
the longitudinal edges are treated in like manner to prevent any cutting or damage
to the exterior surface of the tube. The diameter of the die when the two
parts B B are set in their working position is somewhat less than the external
diameter of the tube which has been passed through the drawing down die.
On drawing the tube F and bar G through the extractor or withdrawing die the
top and bottom portions of the tube metal in coutact with the die are subjected to
compression, and such compression forces out the sides of the tubes into the
spaces dd between the two die parts, thus forming the projections or
excresceuces ff' as at Figure 4. After the tube, has been thus once drawn
completely through the extractor die, I slightly increase the diameter of the die
by means of the adjustment screws C C' and I then turn the tube and bar through
a right angle in order to bring its larger diameter or the pressed out sides into
contact with the die. The tube is then drawn a second time through the extractor
die, with the result that it is returned to a circular section as shown at
Figure 5 and is so loosened as to permit of its ready withdrawal from the bar or
mandril G.
I do not limit the application of my invention to the manufacture of tubes of any
particular metal, but adapt the same with such modifications as may be necessary
in the manufacture of tubes for varying services or requiremcats.

page_text: 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 I'
claim is.-
1. The improved method of loosening a tube from its drawing down bar or
mandril substantially as described.
2. A tube withdrawing appliance consisting of a blook or holder having a
segmental die arranged thereon in such a manner that spaces are provided between
the adjacent edges of the segments, substantially as and for the purposes.
described.
3. The combination with a block such as A fitted with adjustment screws CC,
of the die parts or segments B B' having distance pieces D D interposed between
them and with spaces dd on each side, substantially as and for the purposes.
hereinbefore described and as illustrated in the accompanying drawings.
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicant.