Improvements in Apparatus to be employed in the Manufacture of Metallic Tapered Tubes.
Year: 1892

page_text: Date of Application, 24th Sept., 1892
Complete Specification Left, 24th June, 1893-Accepted, 29th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus to be employed in the Manufacture of
Metallic Tapered 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 to be as follows:-
Our invention relates to improvements in apparatus to be employed in the
manufacture of metallic tapered tubes.
We will describe our invention thus :-
We take an ordinary parallel tube preferably seamless into which we insert at
one end a conoidal mandril. We then pass the tube which is now on the conoidal
mandril between two rolls, one of these rolls revolve in fixed bearings. The other
roll revolves in bearings which may be brought nearer to or removed further from
the bearings of the first named roll so that the distance between the two rolls may
be to a determined extent varied.
The bearings of the rolls are connected to each other by strong springs, so that
if the rolls are separated such separation takes place against the resistance of the
springs, which tend to keep the rolls as near together as possible.
In the periphery of each roll we turn a semi-elliptical groove, so that when the
ungrooved parts of the peripheries of the two rolls are in contact, the groove
between them is elliptical.
After passing the tube between the rolls as now described we give it a second
pass, but before giving it this second pass we turn the tube a quarter of a revolution
on its own axis, so that what was its centre line in cross section in a horizontal
plane, becomes its centre line in a vertical plane.
The result of passing a parallel tube on a conoidal mandril in the above manner
between rolls made and adjusted as above described is to convert the tube from
being a parallel tube to a taper one.
Dated 24th Cantomhan 1000
THOS. KENDRICK,
A gent
COMPLETE SPECIFICATION.
Improvements in Apparatus to be employed in the Manufacture of
Metallic Tapered 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 invention relates to "Improvements in apparatus to be employed in the
manufacture of metallic tapered tubes," that is to say the converting of a parallel
tube, into a tapered tube, which is effected by the employment of semi-elliptical
grooved rolls, through which the parallel tube is passed when placed upon a
conoidal mandril, under the yielding pressure or resistance of springs, stean,
hydraulic, pneumatic, or other elastic or yielding power.
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.
DOJ

page_text: Fig. 1 is a sectional view longitudinal of a parallel tube, upon a conoidal mandril,
preparatory to rolling and converting to a tapered tube.
Fig. 2 is a longitudinal view section, of said tube, shewing the process of first
pass through the rolls.
Fig. 3 is a view of rolls, with formation of tube upon conoidal mandril by the
first pass, as section A, B, as Fig. 2.
Fig. 4 is a longitudinal view, section of said tube upon conoidal mandril, shewing
the process of second pass, through rolls.
Fig. 5 is a view of rolls, with formation of tube upon conoidal mandril by the
second pass at section C, D, as Fig. 4.
Fig. 6 is a view longitudinal section of finished tapered or conoidal tube on the
conoidal mandril.
Fig. 7 is a front view elevation of the rolls in housings.
Fig. 8 is a side view elevation of same.
Fig. 9 is a view shewing the application of a spring to end of rolls, tending to
bring them both together, the same kind of spring being employed in the same
position at the other end.
Fig. 10 is a view shewing the application of two springs to each end of rolls,
tending to bring them both together.
a, is a parallel tube, and b is the conoidal mandril, upon which a, is placed, c, c, are
the two rolls, one of which revolves in freed bearings, while the other revolves
in bearings, which may be brought nearer to, or removed farther from, the bearings
of the first named roll, d, d, indicate these bearings which with the rolls c, c, are
brought together by the power of springs, e, e, or their equivalent.
The periphery of each roll is formed as a semi-elliptical groove, as g, g, so that
when the ungrooved parts of the peripheral surfaces of the rolls c, c, by the power
of e, e, are brought together, the grooves g, g, are elliptical.
Fig. 1, shews a parallel tube a, upon the conoidal or tapered mandril b, and the
first pass of this between the rolls c, c, Fig. 2, is to cause it to partly partake of
the form of the mandril b, upon which it bears, shewn at h, h, Figs. 2 and 3..
When this first pass or process is completed, that is by taking the tube a, upon
the mandril b, through the rolls c, c, the whole length. We give it a second pass
through the same rolls c, c, but preparatory to this we turn the tube a, (which is
now partially tapered) a quarter of a revolution, on its own axis, changing the
centre line in cross-section in a horizontal plane to a centre line in a vertical plane,
in other words bringing the unoperated surfaces i, i, shewn at Fig. 3, to the
position shewn at Fig. 5, which here engages the rolls c, c, and when passed through
the process of tapering or converting a parallel tube, into a tapered one, is effected
and may be described thus :-
When a parallel tube is placed upon a conoidal or tapered mandril, and passed
between rolls, the periphery of which is semi-elliptical, when brought together by
the power of springs or other elastic or yielding pressure, such pressure
accommodating itself to the required increase in the periphery of the conoidal
or tapered mandril, and the tube thereon during its whole length, in either the
first or second pass.
For some purposes in the tapering of tubes, we may employ more than two rolls
as above described and should set them up to our requirement.
The above being our said invention we wish it to be observed that we do not
limit ourselves to the precise details or arrangement of parts 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 inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
1st. "
In improvements in apparatus to be employed in the manufacture of
metallic tapered tubes." The combination, of two rolls, one of which revolves in

page_text: fixed bearings, while the other revolves in bearings which may be brought nearer
to, or removed farther from the bearings of the first named, the periphery of each
said roll having a semi-elliptical groove for receiving the passes of a parallel tube,
upon a conoidal mandril through same, and its being converted, into a tapered tube,
substantially as herein before described.
2nd. The combination of springs or an equivalent, to the said rolls, having a
yielding pressure, for tending to bring together the said rolls, during the passes of a
parallel tube upon a conoidal mandril, through same, and its being converted into
a tapered tube, substantially as herein before described.
3rd. The general combination and arrangement of parts substantially as herein
before described and for the purposes set forth in the foregoing Specification and
shewn on the accompanying sheet of drawings.
THOS. KENDRICK,
Agent.