Improvements in Mandrils for Use in Reducing the Diameter of Tubes.
Year: 1896

page_text: Date of Application, 7th Oct., 1896
Complete Specification Left, 6th July, 1897-Accepted, 25th Sept., 1897
PROVISIONAL SPECIFICATION.
Improvements in Mandrils for Use in Reducing the Diameter
of Tubes.
I, JAMES ARDLEY, 2, Foxley Road, N. Brixton, S.W., Engineer do hereby
declare the nature of this invention to be as follows:-
My invention relates to mandrils to be used inside tubes of any diameter while
reducing the ends by spinning, hammering, pressing or other operation. The
object of the invention is to allow the mandril to be withdrawn after the tube has
been reduced at the end or ends and in carrying it into effect I proceed in or in
about the following manner. I divide the mandril longitudinally into two or
more parts, preferably four parts, and these component parts are held together
by a nut or equivalent screwed on or attached to one end. After the tube has been
operated on the nut or equivalent is retired and the component parts of the
mandril will then separate and can be removed. In order to render the mandril
expanding to suit tubes of various diameter, I form it in sections as before, but
I make them of such cross-sections that when placed together for use they will
have an internal conical hole followed by a parallel one. Within the conical part
slides a conical plug to which is attached a parallel rod sliding through the
parallel hole. The end of the parallel rod protrudes through the end of the
mandril and is threaded to accommodate a hollow nut. The ends of the com-
ponent parts of the mandril are held by a nut or equivalent as already mentioned,
this nut forming also a bearing place for the hollow one on the end of the parallel
rod above referred to. By screwing up the hollow nut the rod is drawn through
the hole and the plug also, and the latter being conical expands the mandril more
or less according to the space through which the plug is drawn.
The exterior surfaces of the mandrils are of such form as is required by the
work to be done.
Dated this 5th day of October 1896
HUGHES & YOUNG,
23, Coleman Street, London, E.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Mandrils for Use in Reducing the Diameter
of Tubes.
I, JAMES ARDLEY, 2, Foxley Road, N. Brixton, S.W., Engineer, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
My invention relates to mandrils to be used inside tubes of any diameter while
reducing the ends by spinning, hammering, pressing or other operation. The

page_text: object of the invention is to allow the mandril to be withdrawn after the tube has
been reduced at the end or ends, and in carrying it into effect. I proceed in or in
about the following manner, making reference to the accompanying drawings in
which Figs. 1 & 3 being sectional side views & Figs. 2 & 4 cross sections. I
divide the mandril longitudinally into two or more parts, preferably four parts,
as a, b, c, d, and these component parts are held together by a nut or equivalent e
screwed on or attached to one end. After the tube has been operated on, the nut
or equivalent is retired and the component parts of the mandril will then separate
and can be removed. In order to render the mandril expansive to suit tubes of
various diameters, I form it in sections a¹, b, c, d as before, but I make them of
such cross sections that when placed together for use, they will have an internal
conical hole f followed by a parallel one g. Within the conical part slides a
conical plug h to which is attached a parallel rod i sliding through the parallel
hole g. The end of the parallel rod protrudes through the end of the mandril,
and is threaded to accommodate a hollow nut j. The ends of the component parts
of the mandril are held by a nut or equivalent e as already mentioned, this nut
forming also a bearing place for the hollow one j on the end of the parallel rod i
above referred to. By screwing up the hollow nut, the rod is drawn through
the hole and the plug also, and the latter being conical expands the mandril more
or less according to the space through which the plug is drawn. The exterior
surface of the mandrils may be of such form as is required by the work to be done.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
CLAIMS.
1. Mandrils for use in reducing the diameter of tubes, the said mandrils being
so constructed that they may be separated longitudinally for the purpose of
facilitating removal from the interior of the tube, the whole substantially as
described in the above specification.
2. Mandrils for use in reducing the diameter of tubes, the said mandrils being
so constructed that they may be separated longitudinally for the purpose of
facilitating removal from the interior of the tube, the said mandrils being also
rendered expandable by the longitudinal movement of a conical plug operating
within a conical hole formed within the component parts of the mandril, the whole
substantially as described in the above specification.
3. Mandrils constructed and operating substantially as described in the above
specification.
حيم
1008
HUGHES & YOUNG,
23, Coleman Street, London, E.C., Agents for Applicant.