Year: 1896

page_text: Date of Application, 19th Feb., 1896
Complete Specification Inft. 10th Al
1000
JAU
A
2000
We, GEORGE EDWARD VAUGHAN, Engineer, and J. & S. ROBERTS, LIMITED,
Ironfounders, both of the Swan Foundry, West Bromwich, Staffordshire, do
hereby declare the nature of this invention to be as follows:-
Relates to improvements in the construction of, and mechanism for collapsible
core bars such as are generally used in the moulding of pipes, cylinders, or other
similar bodies or purposes.
It consists as follows:-A metal tube or core body is cast, whose exterior shape
is made to approximately correspond to the interior shape of the pipes, cylinders
or other finished work to be moulded. The thickness of the metal of this core
body is such as to allow of a given amount of springyness as hereinafter explaine 1.
The usual perforations or air holes are also made in this core body. A longi-
tudinal parallel strip is now cut away from end to end thus leaving an open gap
from end to end; or if desired in some cases this gap may be cast in. Alternately
along each side of this gap and a little inwardly are provided outstanding pins,
which engage with diagonal or inclined slot holes formed in a plate which runs
along the said gap, the thickness of the said plate being such as to suit the gap.
Hence when this plate is pushed lengthwise in the one direction, the slot holes
cause it to also to extend radially and vice versa.
gap
Further. Upon the inside of the body and arranged along each side of this
are formed two or mere lugs or joints to each of which the one end of a toggle link
may be attached. The other ends of these links are connected to a corresponding
number of suitable fittings upon a longitudinally sliding bar which is carried in
bearings formed upon or carried from the interior of the core body at the opposite
side to the gap. A to and fro motion is given to this bar by means of a screw-
thread and box nut or similar device at the one end. The toggle links before-
mentioned assume a somewhat inclined position so that when the bar is advanced in
the one direction, the sides (so to speak) of the core body is extended, that is, the
gap is made wider, and vice versa.
Its action is therefore somewhat as follows:- When the longitudinal plate is in
the gap and flush with the external diameter of the core body, the exterior may be
loamed, or otherwise prepared as a core. When the casting has been effected and
it is desirable to withdraw the core body, the longitudinal plate is first knocked
or pushed along endways until it has withdrawn itself radially within the core
body, leaving the gap open. By now operating the screw upon the toggle link bar
the two sides of the body are drawn inwards, until the gap is closed, and thus the
diameter of the core body sufficiently reduced to readily permit of its being
withdrawn from the casting.
A turntable arrangement of mechanism is now provided having upon its upper
side a concentric rib, recess or set off agreeing with the end of the core bar, so that
when the said core bar is placed thereon endwise (upright) it may revolve truly.
Upon the underside of this turntable is provided a race to receive a number of
balls in conjunction with a bottom plate a ball bearing upon which the table
revolves. At or near the edge of the table is an all around toothed wheel into

page_text: which engages a worm or a bevil or spur wheel so that such may be revolved by
power or by hand during the loaming or strickling processes.
Dated this 18th day of February 1906
CHARLES T. POWELL,
Applicants' Agent.
Improvements in or connected with Collapsible Core Bars.
We, GEORGE EDWARD VAUGHAN, Engineer, and J. & S. ROBERTS LIMITED,
Ironfounders, both of the Swan Foundry, West-Bromwich, Staffordshire, 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 :-
This invention relates to improvements in the construction of, and mechanism
for collapsible core bars such as are generally used in the moulding of pipes,
cylinders, or other similar bodies or purposes.
In order to more clearly explain this our invention we have appended here-
unto illustrative drawings upon which are figures and numbers of reference,
similar numbers referring throughout the several views to the same thing or
part.
Fig. 1, is a sectional elevation of this our invention.
Fig. 2, is a sectional transverse view of our invention on line A-B of Fig. 1.
Fig. 3, is an end view of the invention.
Fig. 4, is a plan view of the invention with a portion of the shell removed in
order to show the interior mechanism.
Figs. 5 & 6 are detailed views showing the sliding plate in its inwardly
withdrawn position as hereinafter explained.
Fig. 7 shows the turntable arrangement of mechanism.
The invention consist as follows:-A metal tube or core body 9 is cast, whose
exterior shape is made to approximately correspond to the interior shape of the
pipes, cylinders or other finished work to be moulded. The thickness of the metal
of this core body is such as to allow of a given amount of springyness as hereinafter
explained. The usual perforations or air holes (not shown) are also made in this
core body. A longitudinal parallel strip is now cut away from end to end; or if
desired in some cases this gap may be cast in. Alternately along each side of this
gap and a little inwardly are provided outstanding pins 11, which engage with
diagonal or inclined slot holes 12 formed in a plate 13 which runs along the
said gap 10, the thickness of the said plate being such as to suit the gap.
Hence when this plate is pushed lengthwise in the direction of the arrow 14
the slot holes cause it also to withdraw radially as seen in Figs. 5 & 6 and
vice versa.
Further. Upon the inside of the body and arranged along each side of this gap
are formed two or more lugs or joints 15 to each of which the one end of toggle
links 16 may be attached. The other ends of these links are connected to a
corresponding number of suitable fittings 17 upon a longitudinally sliding bar 18
which is carried in bearings 19 formed upon or carried from the interior of the
core body at the opposite side to the gap. A to and fro motion is given to this
bar by means of a screwthread 20 and box nut 21 or similar device at the one end.
The toggle links 16 beforementioned assume a somewhat inclined position so
that when the bar 18 is advanced in the direction of the arrow 22 the sides
(so to speak) of the core body is extended, that is, the gap 10 is made wider, and
vice versa.

page_text: Its action is therefore somewhat as follows:-When the longitudinal plate 13 is
in the gap and flush with the external diameter of the core body as seen in
Figs. 1, 2 & 3, the exterior may be loamed, or otherwise prepared as a core.
When the casting has been effected and it is desirable to withdraw the core body,
the longitudinal plate 13 is first knocked or pushed along endways until it has
withdrawn itself radially within the core body, as shown in Figs. 5 & 6 leaving
the gap 10 open. By now operating the screw 20 upon the toggle link bar 18 by
means of the square 23 the two sides of the body are drawn inwards, until the gap
is closed, and thus the diameter of the core body is sufficiently reduced to readily
permit of its being withdrawn from the casting.
A turntable arrangement of mechanism is now provided as shown in Fig. 7
having upon the upper side of the plate 24 a concentric rib, recess or set off 25,
agreeing with the end of the core bar 8, or if desired a number of adjustable
plates may be used, so that when the said core bar is placed thereon endwise
(upright) it may revolve truly. Upon the underside of this turntable is provided
a race to receive a number of balls 26 in conjunction with a bottom plate 27, having
a similar ball bearing upon which the table revolves. At or near the edge of the
table is an all around toothed wheel 28, into which engages a bevil wheel 29
(or a spur wheel or a worm wheel) so that the table 24, with the core bar
thereon may be revolved by power or by hand during the loaming or strickling
processes.
We are aware that collapsible core bars have already been used, also that sliding
plates with inclined slots have been used, and therefore we do not claim these in
our invention, in and of themselves, but;
Having now particularly described and ascertained the nature of this our
said invention, and in what manner the same is to be performed, we declare that
what we claim is :-
1. In a collapsible core bar the combination with the body 9, having the open
gap 10 and inclined sliding plate 13, of the screw bar 18, carried in bearings 19,
and connected to and operating the links 16, which said links are further con-
nected to the body 9, all constructed and operating substantially as set forth and
illustrated.
2. The improved means of carrying and rotating core bars such as 9, as
herein described, that is to say, the table 24, having the rib or plates 25, and
ball race for balls 26, in combination with the bottom plate ball race, the said
plate 24, being rotated by gearing or by hand substantially as set forth and
shown.
Dated this 18th day of November 1896.
CHARLES T. POWELL,
12 Cherry Street, Birmingham, Applicants' Agent.