Improvements in the Means or Mode of Releasing Tubes from the Mandrel or Bar after they are Rolled or Drawn.
Year: 1896

page_text: Date of Applicati n, 19th Mar., 1895
Complete Specification Left, 18th Dec., 1816-Accepted, 13th Feb., 1897
Improvements in the Means or Mode of Releasing Tubes from the
Mandrel or Bar after they are Rolled or Drawn.
We, WILLIAM PILKINGTON and ARTHUR PILKINGTON of the Firm and 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 means or mode of releasing
tubes from the mandril or har, after they are rolled or drawn.
It is well known in such manufacture, the tube is closed on the mandril so tightly
by the external pressure, employed, that the withdrawal of the mandril is a matter of
some difficulty, and it has to be effected by mechanical means.
The object of our invention is a new or improved method of effecting the with-
drawal of the mandril.
We will describe our invention thus :-
We provide a strong fixed metallic plate, with an aperture sufficient to allow of
the passage through it of the mandril, but not of the tube which is on it, the end
of the tube will abut against this strong metallic plate.
Or instead of a fixed plate with an aperture of unalterable size, we may use
adjustable jaws, to accomodate to the size of the tube and mandrel.
On that side of the fixed metallic plate, or of the adjustable jaws, as the case may
be and remote from the tube, we provide a pair of rolls, either or both of which may
be driven by appropriate mechanism. These rolls revolve in opposite directions, and
they can be made to approach or recede from each other, being carried in proper
adjustable bearings in framing.
The mandril is caused to project so far through the tube that when the end of the
tube abuts against the fixed plate, or the jaws, the mandril itself will project so far
through the aperture in the plate, or through the jaws, as the case may be, that it will
be seized by the revolving rolls, which have to be set close enough together to give
the requisite frictional grip on the mandril. The rolls revolve in such a direction
that they grip the mandril and draw it through the aperture in the fixed plate, or the
jaws, whichever may be employed, as the tube cannot pass through this aperture or
between the jaws, by reason of its being too large, the mandril is pulled off it by the
revolving rollers. The axes of the rolls may be vertical, or horizontal or inclined as
may be found most convenient in any particular case.
Dated 19th of March 1896
THOS. KENDRICK,
3, Cherry Street, Birmingham, Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in the Means or Mode of Releasing Tubes from the.
Mandrel or Bar after they are Rolled or Drawn.
We, WILLIAM PILKINGTON and ARTHUR PILKINGTON of the Firm and 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 means or mode of releasing
tubes from the mandrel, or bar, after they are rolled or drawn. It is well known in
such manufacture that the tube is closed on the mandrel so tightly by the external
pressure employed in the rolling or drawing that the withdrawal of the mandrel has
to be effected by mechanical means, and this is the object of our invention.
And in order that this our said invention may be more particularly described and
ascertained, reference is hereby made to the accompanying sheet of drawings, in
which similar letters of reference indicate corresponding parts.
Figure 1 is a plan view of the whole machine shewing the rolls in a horizontal
position and gripping the mandrel for releasing the same from the tube, and
constructed according to our invention.
Figure 2 is a side elevation of same.
Figure 3 is a front view of the whole machine shewing the rolle in a vertical
position, and gripping the mandrel for releasing the same from the tube and
constructed according to our invention.
Figure 4 is a plan view of same.
Figure 5 is a front view of the plate.
Figure 6 is a plan view of same.
a is the mandrel, b is the tube thereon, c c are the jaws for preventing the tube b
passing along on the mandrel a, d is the set screw for adjusting jaw c, d is an
eccentric cam for adjusting the jaw c', e the spindle actuating the cam d, e the
handle, or lever actuating the spindle e, f, are rolls, either or both of which may be
driven by suitable mechanism, and in opposite directions, these rolls ff' are carried
in bearings gg' in the frame h, and adjusted by means of the screw h', and are
capable of approaching or receding to or from each other by the elasticity of the
spring i.
In each of the figures the mandrel a is shewn so far through the tube b, that when
the end of the tube babuts against the jaws c, c', and is fixed, the mandrel a is seized
by the revolving rolls ff, the frictional grip of which draws the mandrel a out of the
tube and through the jaws c, c', and into the trough j.
We may employ in some instances as a substitute for the jaws cc' a strong fixed
inetallic plate with an aperture sufficient to allow the passage of the mandrel a
through it, but not of the tube b which is on it, as this would abut against the outer
surface of the plate, the operation of the rolls ff are as above described.
The axes of the rolls may he vertical or horizontal, or inclined, and of a number
more than two if required.
We would observe in conclusion that we do not limit ourselves to these drawings
and only as illustrative of our invention as we may vary or modify the same without
departing essentially 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 :-
In improvements in the means or mode of releasing tubes from the mandrel or bar,
after they are rolled or drawn,

page_text: 1. The combination, the rolls ff', the jaws c, c¹ or their equivalent, the plate!
with aperture m, substantially as and for the purpose hereinbefore described and
illustrated by the drawings.
2. The general construction and combination of parts substantially as hereinbefore
described in the foregoing specification and illustrated on the accompanying sheet.
of drawings.
THOS. KENDRICK,
New Eldon Chambers, 50 Cherry Street, Birmingham,
Agent for Applicants.