Improvements in the Mode of and Means for Releasing Tubes from the Mandrel or Solid Bar upon which they are Drawn.
Year: 1894

page_text: Date of Application, 21st June, 1894
Complete Specification Left, 1st Sept., 1894-Accepted, 13th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in the Mode of and Means for Releasing Tubes from
the Mandrel or Solid Bar upon which they are Drawn.
We, ROBERT WOOTTON, of Harborne Road, Edgbaston, Birmingham, in the
County of Warwick, Gentleman, and BENJAMIN HEWITT, of 72 Wiggin Street
Icknield Port Road, Birmingham, aforesaid, Engineer do hereby declare the nature
of our said invention to be as follows:-
:-
Our invention has for its object improvements in the mode of and means for
releasing tubes from the mandrel or solid bar upon which they are drawn by which
I readily render the removal of such mandrels or bars casy of accomplishment and
this without in any way marking the tubes in the process.
In carrying our invention into effect we run the tubes containing the mandrel or
solid bar through two horizontal rolls which are so shaped that they press upon the
tubes upon two sides only in such a manner that they roll the tube into a slightly oval
shape, the bulge taking place on each side of the tube which is not under the
pressure of the rolls. These rolls are so geared as to feed the tube into two vertical
rolls of a similar shape to those of the horizontal rolls which have their pressure
upon those two sides of the tubes in which the bulge was made by the previous rolls
thus pressing it in and causing the reverse two sides which had been previously
pressed to slightly bulge out from the mandrel or bar by which means the tube is
slightly enlarged without in any way altering its shape or marking it as the rolls in
each case are round so that they present a perfectly smooth surface to the tube. It
will readily be seen that after the tube has been by these means, slightly enlarged,
the removal of the mandrel or bar will be easy to accomplish and in the case of
tubes other than those that are round in section we vary the shape of the rolls to
suit the shape of the tube so as to press or bite it, first on two sides or at two points
and afterwards upon the other two sides or two points as before described. One of
the section pair of rolls may be geared to revolve, the other one revolving by
friction or the second pair of rolls inay revolve entirely by friction.
Dated this 20th day of June 1894.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicants.

page_text: Improvements in the Mode of and Means for Releasing Tubes from
the Mandrel or Solid Bar upon which they are Drawn.
We, ROBERT WOOTTON. of Harborne Road, Edgbaston, Birmingham, in the
County of Warwick, Gentleman, and BENJAMIN HEWITT, of 72 Wiggin Street,
Icknield Port Rond, Birmingham, aforesaid, Engineer, do hereby declare the nature
of our said invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
Our invention has for its object improvements in the mode of and means for
relensing tubes from the mandrel or solid bar upon which they are drawn by which
I readily render the removal of such mandrels or bars easy of accomplishment and
this without in any way marking the tubes in the process
In enrrying our invention into effect we run the tabes containing the mandrel or
solid bar through two horizontal rolls which are so shaped that they press upon the
tubes upon two sides only in such a manner that they roll the tube into a slightly
oval shape, the bulge taking place on each side of the tube which is not under the
pressure of the rolls. These rolls are so geared as to feed the tube into two
vertical rolls of a similar shape to those of the horizontal rolls which have their
pressure upon those two sides of the tubes in which the bulge was made by the
previous rolls thus pressing it in and causing the reverse two sides which had been
previously pressed to slightly bulge out from the mandrel or bar by which means
the tube is slightly enlarged without in any way altering its shinpe or marking it as
the rolls in each case are round so that they present a perfectly smooth surface
to the tube. It will readily be seen that after the tube lins been by these menus,
slightly enlarged, the removal of the mandrel or bar will be easy to accomplish.
and in the case of tubes other than those that are round in section we vary the
shape of the rolls to suit the shape of the tube, so as to press or bite it, first on
two sides or at two points and afterwards upon the other two sides or two points as
before described. One of the section pair of rolls may be geared to revolve, the
other one revolving by friction, or the second pair of rolls may revolve entirely by
friction.
In order that our invention may be clearly umlerstood and more easily caried into
practise we have appended hereunto two double sized sheet of drawings upon which
we have fully illustrated the nature of our said improvements,
Figure 1 is a cross section through our machine.
Figure 2., is a plan of same.
Figure 3., is a part end elevation of the rolls B.
Figure 4., is a part side elevation showing the housing for the rolls A.
Figure 5., is a front elevation of the straightening device. nt the entrance to
the rolls B.
Figure 6., is an enlarged elevation of the rolls A, A'.
Figure 7., is an enlarged elevation of the rolls 13, B'.
Our machine for the relensing of the tubes from the mandrel or solid bar upon
which they are drawn consists of the horizontal rolls A, A' mounted in suitable
housings which also support the brackets Y or other suitable means the pair of
vertical rolls B B. The rolls A are geared by the wheels Cand are driven by
the pulley E through the train of wheels T, F and f' while the pinion I drives the
vertical folis 13 by menus of the intermediate bevel wheels S & 6. Straightening
rollers D and D' are provided at the entrance to the first pair of rolls A the tube
being guided in between game by a suitable trumpet mouth V. The rollers D
are mounted upon the sliding block R upon which the wedge shaped block
mounted the lever P being provided so that upon being pressed its roller pacts
is

page_text: upon the block and forces it sufficiently far back for the tube to be easily inserted,
after which, upon the handle being released the block is retained with its pressure
tight upon the tube, the pressure being obtained by any suitable spring such as J.
The lever P is retained ont of action by the weight W. The pressure on the
rolls A A¹ is provided by the set screw a² acting upon the intermediate springs H
or a horizontal band spring may be used with the adjustment pin at a³. The
lateral adjustment of the rolls A A' are effected by the screw pin a³ while means
for adjusting the nip of the rolls vertically is provided by means of the wedge
shaped blocks Figure 4. This arrangement allows of the nip of the two pairs
of rolls A, A and B, B¹ being brought exactly to a true line.
The pressure upon the vertical roll B is obtained by the nut n' through the
intermediate springs N but this pressure may also be effected by means of vertical
band springs.
In releasing the tubes from the mandrel or solid bar upon which they are drawn
we run the said tubes through the horizontal rolls A A³ which are provided with
the grooves a which are so shaped that they press upon the tubes K on two sides
as shown at Figure 6 and thus roll the said tube into a slightly oval shape the
bulge taking place at on each side. These rolls A, A' feed the tube into the
vertical rolls B, B' which are of a similar shape to the horizontal rolis but have
their pressure upon the reverse sides of the tube so as to slightly bulge out the
sides which had been previously pressed as shown at Figure 7 the two pair of rolls
being so made adjustable one to another as before described that the nip or pressure
of the second pair of rolls is exactly at right angles to the nip or pressure of the
feeding pair A, A'. After the tube has been enlarged in this manner it will be
seen that the removal of the mandrel or bar M is a comparatively easy matter.
The roll B may be geared instead of running by friction as shown. The tube as
it enters the rolls A A' is drawn through the rollers D, D' and is thereby
straightened by the process.
The rolls B B may be formed with a groove formed to the segment of a true
circle so as to bring the tube perfectly round in section.
We may provide an additional pair of rolls which would then cause the tube to be
operated upon six sides in turn or two additional pairs of rolls in which case the
tube would be operated on eight sides, the first two pair of rolls being of a more
powerful nature than the succeeding two pair.
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 we are
aware that it has been previously proposed to use rolls for freeing the tube from
the mandril after manufacture and we do not claim such use generally but what
we claim is-
Ist. The improvements in the mode of and means for releasing tubes from the
mandrel or solid bar upon which they are drawn substantially as and for the
purpose herein set forth and shown upon the accompanying drawings.
2nd. The machine having rolls A A¹ and 13, 11 working in combination with
each other and operating upon the tube, substantially as and for the purpose herein
set forth and shown upon the accompanying drawings.
3rd. In machines for releasing tubes, three or more pairs of rolls working in
combination and operating upon the tube, substantially as and for the purpose
herein set forth.
ROBERT WOOTTON.
BENJAMIN HEWITT.
George Barker,
77, Colmore Row, Birmingham, Agent for Applicants.