Improvements in the Manufacture of Seamless Steel Tubes.
Year: 1889

page_text: Date of Application, 26th Oct., 1889
Complete Specification Left, 26th July, 1890-Accepted, 20th Sept., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Seamless Steel Tubes.
We WILLIAM PILKINGTON, CHARLES THOMAS BISHOP and ANDERSON BROWNSWORD
trading as "The Birmingham Climax Steel Tube Co.," Catherine Street Lichfield
Road Birmingham do hereby declare the nature of our said invention to be as
follows:-
The process to which our invention refers is that by which the cylindrical stee
ingot is converted into a comparatively short thick tube which is subsequently
dealt with by other processes.
Hitherto the cylindrical ingot after having a hole drilled or bored right through
it in the direction of its length along its axis, has been heated and then placed in a
drawbench and a plug of larger diameter than the hole drawn through it thus
enlarging the whole and at the same time lengthening the ingot. This process
must be repeated several times and the ingot reheated between the drawings.
At the close of the process the cylindrical ingot which had at first only a hole
through it in the direction of its length coinciding with its axis has by the
proportionate enlargement of the hole and lengthening of the ingot assumed the
shape of a comparatively short thick tube. This tube is subsequently drawn to
the size and thickness required.
To produce this thick tube by our invention, we take a cylindrical ingot and bore a
comparatively small hole through it in the direction of its length as is done at present.
We then heat the ingot and force into it at one end a suitable mandri of conoidal
form. We then place the hot ingot with the mandril in it in a tube rolling machine
and pass it through the revolving grooved rolls. As the mandril is prevented by
suitable means from moving along with the ingot, the ingot is drawn over it by the
action of the rolls, and is thereby lengthened and the hole enlarged.
We may use mandrils of increasing size one after the other passing the ingot
which now assume the proportions of a thick tube through appropriate grooves in
the rolls.
By these means we are able to produce a tube from a drilled ingot at one heat and
at a great saving in metal.
Dated Ofth 1000
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Seamless Steel Tubes.
We, WILLIAM PILKINGTON, CHARLES THOMAS BISHOP and ANDERSON BROWNSWORD
trading as The Birmingham Climax Steel Tube Co.," Catherine Street, Lichfield
Road, 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 :-
The process to which our invention refers is that by which the cylindrical steel ingot
is converted into a comparatively short thick tube which is subsequently dealt with by
other processes.
Hitherto the cylindrical ingot after having a hole drilled or bored right through it
in the direction of its length along its axis, has been heated and then placed in a
.מ.

page_text: •
drawbench and a plug of larger diameter than the hole drawn through it thus
enlarging the hole and at the same time lengthening the ingot. This process must
be repeated several times and the ingot reheated between the drawings.
At the close of the process the cylindrical ingot which had at first only a hole
through it in the direction of its length, coinciding with its axis has by the pro-
portionate enlargement of the hole and lengthening of the ingot assumed the shape of
a comparative short thick tube. This tube is subsequently drawn to the size and
thickness required.
To produce this thick tube by our invention, we take a cylindrical ingot and bore
a comparatively small hole through it in the direction of its length as is done at
present. We then heat the ingot and force into it at one end a suitable mandril of
conoidal form. We then place the hot ingot with the mandril in it in a tube rolling
machine and pass it through the revolving grooved rolls. As the mandril is
prevented by suitable means from moving along with the ingot, the ingot is drawn
over it by the action of the rolls and is thereby lengthened and the hole enlarged.
We may use mandrils of increasing size one after the other passing the ingot
which now assumes the proportions of a thick tube through appropriate grooves in
the rolls.
By these means we are able to produce a tube from a drilled ingot at one heat and
at a great saving in metal.
And in order that this our said invention may be more fully understood we shall
now proceed more particularly to describe the same, 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.
Fig. 1, is a view in section of the cylindrical ingot with a small hole through it.
Fig. 2, is also a view in section of the said ingot, but with one end opened.
Fig. 3, is the end view as Fig. 1.
Fig. 4, is the mandril with conoidal formed end.
Fig. 5, is a view front elevation of framing carrying the revolving grooved rolls.
Fig. 6 is a view in section shewing ingot passing through grooved rolls, and the
appliance for holding the mandril stationary.
a, is the cylindical ingot with small hole b, c, shewing the same opened to receive
the mandril d, provided with the loose conoidal formed end e, f, is the framing carrying
the revolving grooved rolls g, g.
In Fig. 5 we do not shew the ingot a, and mandril d.
In Fig. 6 we illustrate our process by shewing the ingot a, upon the mandril d
(which is stationary by means of the appliance, or other suitable manner) passing
between the rolls g, g, by the pressure and motion of which a, is drawn over e, and
elongated, and this process may be repeated until a tube. is produced. of the required
diameter.
We may in some instances employ or construct to the framing for in connection
therewith two sets of grooved rolls as g, y, one set as shewn at Fig. 5 and Fig. 6, the
axes being horizontal, but in the second set, the axes would be vertical. d, would be
employed but e, increased .in size, so that the tube being drawn thereon will upon
passing the first pair of rolls be caught nearly simultaneously by the second pair of
rolls, thus drawing or elongating the tube more regularly.
The above being our said invention we wish it to be observed that we do not limit
ourselves to the precise details as shewn on the sheet of drawings but we may vary or
modify the same without departing from the principle of our said invention.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what we
claim is ;
Improvements in the manufacture of seamless steel tubes
1st. Taking the ingot a with small hole b and opening as c, and heated to receive
the mandril d, with the conoidal formed end e, and passing the same through a pair,

page_text: or more, of revolving grooved rolls g, g suitably mounted, substantially for the
purpose as herein before set forth and described.
2nd. The general construction combination and arrangement of parts as herein-
before described in the foregoing specification and illustrated on the accompanying
sheet of drawings.
D
T 1
1000
THOS. KENDRICK,
Agent for Applicants.