Improvements in the Means or Mode Employed in the Manufacture of Seamless Metallic Tubes.
Year: 1896

page_text: Date of Application, 8th Jan., 1896
Complete Specification Left, 8th Oct., 1896-Accepted, 5th Dec., 1896
PROVISIONAL SPECIFICATION.
Improvements in the Means or Mode Employed in the Manufacture
of Seamless Metallic Tubes.
We, WILLIAM PILKINGTON, CHARLES THOMAS BISHOP, ANDERSON
BROWNSWORD and AкTHUR PILKINGTON, trading as The Birmingham Climax
Steel Tube Company, Catherine Street, Aston, Birmingham, do hereby declare
the nature of our said invention to be as follows:-
Our improvements in the means or mode employed in the manufacture of
seamless metallic tubes, relates to the process of releasing the tube from the
mandril after being drawn or rolled.
In our improved process we take a pair of rolls and mount them on parallel or
nearly parallel axes and drive them by appropriate gearing.
In the opposed perhipheries of each of these rolls we form a groove of which the
cross section is usually that of a segment of a circle, the radius of which segment is
larger than the radius of the cross section of the tube which is to be released or
rolled off the mandril.
We constrain the tube, by means of guides or other equivalent device, to pass
between the revolving rolls in a direction slightly oblique to a line at right angles
to the plane in which the axes of the rolls are situated.
We bring the rolls near enough to each other to grip the tube.
The mandril as is well understood offers no necessary resistance to any internal
change of diameter.
If the tube were passed between the rolls exactly at right angles to the plane of
their axis no revolution of the tube would be produced.
The effect however of the duration from the right angle in the direction of the
tubes motion is, that the segmental periphery of the rolls acts upon the tube as it
passes through and causes it and the mandril on which it is placed, to rotate upon
their common axis.
Instead of making the section of the groove in the periphery of the rolls
segmental in shape we may make it of an elliptical or other curve, the essential
feature of our invention being that the curves of the cross section of the
grooves of the rolls shall he of a larger diameter than the curve of the cross section
of the outer diameter of the tube being released and that the tube shall be passed
through the rolls in a direction slightly oblique to a line at right angles with the
plane of the axes of the rolls thus causing rotation of the tube.
We may use two or more rolls as above described, either combined in the same
machine, or in separate machines.
The bearings in which these rolls revolve are capable of being approached to, or
receded from each other by means of springs, or weights or weighted levers, or by
fluid pressure, applied in well known mechanical methods.
Dated 8th January 1896.
THOS. KENDRICK,
3 Cherry Street, Birmingham, Agent.

page_text: Improvements in the Means or Mode Employed in the Manufacture
of Seamless Metallic Tubes.
We WILLIAM PILKINGTON, CHARLES THOMAS BISHOP, ANDERSON
BROWNSWORD and ARTHUR PILKINGTON trading as The Birmingham Climax
Steel Tube Company Catherine Street Aston Birmingham, 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 improvements in the means or mode employed in the manufacture of
seamless metallic tubes, relates to the process of releasing the tube from the
mandril after being drawn or rolled.
And in order that this our said invention may be more fully understood we shall
now proceed to describe the same more particularly, and for that purpose we shall
refer to the several figures on the sheet of drawings hereunto annexed the same
letters of reference indicating corresponding parts throughout all the figures.
Figure 1 is a side view in clevation shewing our improved process as employed
in the manufacture of seamless metallic tubes (viz.) the releasing of the tube from
the mandril after being drawn or rolled.
Figure 2 is an end view in elevation of same.
Figure 3 is a plan view of same.
Figure 4 is an enlarged view of parts in section.
Figure 5 is a side view in elevation shewing our improved process as employed
in the manufacture of seamless metallic tubes (viz.) the releasing of the tube from
the mandril after being drawn or rolled.
Figure 6 is au end view in elevation of same.
Figure 7 is a plan view of same.
a and b are the upper and lower rolls respectively mounted upon the upper and
lower axes c. and d. respectively set up in suitable bearings in the frame or
housing e. and driven by appropriate gearing.
The opposed peripheries of each of these rolls a and b, are provided with
grooves f.. preferably the segment of a circle the radius of each segment in each
roll a. and b. being larger than the radius of the cross section of the tube g. on
the mandril h.
By reference to Figures 1, 2, 3 it will be seen that the rolls a. b. are mounted
upon the axes c. d. which are parallel to each other. The rolls are set. near
enough to each other to grip the tube g. on the mandril h. which is constrained or
impelled in its pass (by the employment of guides and supports not shewn) to
engage with the said revolving rolls a b in a direction slightly oblique to a line at
right angles to the plane in which the axes c d of the rolls a b are mounted.
If the tube g, on the mandril h were passed between the rolls a. and b exactly at
right angles to the plane of their axes c. d. no revolution of the tube g, would take
place and no release from the mandril h.
But the deviation from the right angle in the direction of the tube g motiou is,
that the segmental periphery of the grooves f. f. of the rolls a. b. acts upon g. as it
passes through and causes it and the mandril h. on which it is placed to rotate, and
this has the effect of releasing the tube g. from the mandril . We make the
section of the grooves . . in the periphery of the rolls a. b. of any shape suitable
to our purpose. The essential feature of our invention being that the curves of
the cross-section of the grooves f. f. of the rolls a b. shall be larger in diameter than
the cross-section of the outer diameter of the tube g, being released from the

page_text: mandril , and that the said tube g. on its mandril shall be constrained or impelled
to pass through the rolls a b, in a direction slightly oblique to a line at right angles,
with the plane of the axes c d. of the rolls a b, thus causing a rotation of the tube g
on the mandril h.
By reference to Figures 5, 6, 7, the rolls a b, are mounted upon the axes o d
which are not quite parallel to each other, consequently the said rolls are not
parallel to each other, but if the tube g on the mandril h is constrained or impelled
on its pass to engage with the rolls a b, a revolution of the tube g takes place and
the same object is effected as by Figures 1. 2. 3.
We may employ more than two rolls as a. b. constructed as above described
either combined in the same machine, or in separate machines. The bearings in
which these rolls revolve are capable of being approached to or receded from each
other by means of springs, weights, weighted levers, or by fluid pressure, applied
by well known mechanical methods.
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 :-
"In improvements in the means or mode employed in the manufacture of seamless
metallic tubes"
1st. The combination, the rolls a. b. with grooves f. f. mounted on parallel
axes c. d. for operating upon the tube g. on the mandril . in the manner shewn in
Figures 1, 2, 3 substautially as hereinbefore described and illustrated by the
drawings.
2. The combination the rolls a. b. with grooves f. f. mounted on the axes c. d.
which are not quite parallel to each other for operating upon the tube g, on the
mandril h. in the manner shewn in Figures 5, 6, 7 substantially as herein-before
described and illustrated by the drawings.
3. The general construction and combination of parts substantially as berein-
before described and illustrated by the drawings.
Dated 7th October 1896.
THOS.
KENDRICK,
New Eldon Chambers, 50 Cherry Street, Birmingham, Agent.