Improvements in the Manufacture of Solid Drawn or Seamless or other Metallic Tubes, and in the Means or Mode of Releasing the Mandril therefrom.
Year: 1895

page_text: Date of Application, 30th Nov., 1895
Complete Specification Left, 29th Aug., 1896-Accepted, 3rd Oct., 1396
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Solid Drawn or Seamless or
other Metallic Tubes, and in the Means or Mode of Releasing
the Mandril therefrom.
We, WILLIAM PILKINGTON, CHARLES THOMAS BISHOP and ARTHUR
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 invention has reference to improvements in the manufacture of solid drawn,
or seamless, or other metallic tubes, and in the means or mode of releasing the
mandril therefrom.
By our invention we manufacture tubes as above described in the "cold state,"
by rolling which will be understood by the following description.
We employ cylindrical rolls of a length required for our purpose with their
axes parallel or nearly parallel to each other, these rolls are of equal diameter;
we may employ two rolls and a "bar" or three rolls or more for our purpose, if three
then the centre of their axis in a plane at right angles to the axes would form an
equalateral triangle, by any suitable means we impart a rotary motion to each of
these rolls.
The cylindrical surface of each of these three rolls has a helical groove which
extends the whole length of the roll, this groove is deep at one end of the rolls
which we term the "entering end," but it diminishes in its depth as it proceeds
along the roll, till reaching the other end which we term the "leaving end" the
groove is comparatively nothing, or we may have the groove equal in depth its
whole length.
The pitch of the grooves in each of the rolls are the same, so that if motion is
imparted to the three rolls at the same time, and at the same speed, and in the
proper direction on their axes they form in the triangular space (above mentioned)
on its mandril which
a kind of uut internal threaded screw, so that the "tube use
fits therein would be caught and drawn from the "entering end" to the "leaving
end" of said rolls.
We mount these rolls in any manner suitable to our purposes, providing the
mandril with its "tube use," can be passed endways in the space between the
rolls.
The tube use at first receives deep impressions, but as it passes through, they
decrease till when the "tube use "leaves the rolls it is in the form of a hollow
cylinder.
It is well known that when tubes are rolled or drawn upon a mandril the tubes
will adhere to the mandril by friction so much that considerable force has to be
used to withdraw the mandril from the tube. To remedy this we give the
tube on its mandril a pass through the rolls above named and the mandril is
released.
Dated 30th November 1895.
THOS. KENDRICK,
3 Cherry Street, Birmingham, Agent.

page_text: DI LUITICATION.
Improvements in the Manufacture of Solid Drawn or Seamless or
other Metallic Tubes, and in the Means or Mode of Releasing
the Mandril therefrom.
We, WILLIAM PILKINGTON, CHARLES THOMAS BISHOP, 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 invention has reference to improvements in the manufacture of solid drawn
or seamless or other metallic tubes, and in the means or mode of releasing
the mandril therefrom, and such tubes we roll or manufacture in the cold
state.
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 frout view in elevation of the three helical grooved cylindrical
rolls shewing the tube on its mandril passing through, and constructed according to
our invention.
Figure 2. is an end view of said rolls, tube and mandril.
Figure 3. is a front view in elevation of two helical grooved cylindrical rolls and
a bar, shewing the tube on its mandril passing through and constructed according
to our invention.
Figure 4 is an end view of said rolls and bar with tube and mandril.
In Figures 1 and 2 a. a. a are the three cylindrical rolls provided with the
helical grooves b. b. b. ou their surfaces, and extending from the entering end c to
the leaving end d it will be perceived that at e, the groove is deep but it gradually
diminishes in its depth upon reaching f when it is comparatively nothing. The
pitch of the grooves on each of the rolls are the same, and when rotated at the
same speed, and in the proper direction and simultaneously on their axes g. g. 9
thus forming an equalateral triangular space (where the meeting is) or internal
threaded screw, so that when the "tube use " or sbort thick tube on its mandril ¿
is passed to the entering end c it is caught by the helical grooves b. b. b. and
carried along in a direction parallel to the axes g. 9. g. of the rolls a. a. a. to the
leaving end d the effect of this operation is to reduce its outside diameter and
consequently elongate the tube.
In Figures 3 and 4 a. a are the two rolls, and a¹ is the bar being an equivalent
for the third roll b. b are the helical grooves on the surface of a. a. the rolls as
above set forth, h is the short thick tube, and i. is the mandril. When this is
passed through the rolls a. a. and the bearing surface of the bar a¹ the operation of
reducing and elongating is effected as described of Figures 1 and 2.
To free or remove the mandril i from the tube h, when the said tube has been
operated upon we give it a pass through the three rolls a. a. a or between the two
rolls a. a. and the bar a¹ which gives a little freedom or release so that the
mandril i can be withdrawn from the tube with facility.
We have not shewn these rolls in their housings or bearings as we may mount
these in various ways providing the mandril with its tube use can be passed
endways in the space between the rolls.
Motion is imparted to these rolls by any suitable means.
The above being our said invention we would observe in conclusion that we do

page_text: not limit ourselves to the drawings or specification hereunto annexed as we
may alter or modify the same and yet retain the essential features of our inven-
tion, for instance we may use more than three rolls, and we may dispense with
the bar.
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 :-
1. The construction and application of three cylindrical rolls as a. a. a with
helical grooves b. b. b on their surface extending from end c. to end d. as Figures 1
and 2 substantially as and for the purposes herein before described.
2. The construction and application of two cylindrical rolls a. a. with helical
grooves bb. on their surface extending from end c to end d. and bar a¹ as
Figures 3 and 4 substantially as and for the purposes herein before described.
3. The general construction combination and arrangement of parts as herein-
before described in the foregoing specification and illustrated on the accompanying
sheet of drawings.
Dad oOLL A 1000
;
THOS.
KENDRICK,
New Eldon Chambers, 50 Cherry Street, Birmingham, Agent.