IMPROVEMENTS IN CORE BARS FOR USE IN CASTING METAL PIPES OR CYLINDERS
Year: 1878

page_text: LETTERS PATENT to James Chambers, of the Stanton Iron Works, near Not-
tingham, in the County of Derby, Foundry Manager, for the Invention of
"IMPROVEMENTS IN CORE BARS FOR USE IN CASTING METAL PIPES OR
CYLINDERS."
Sealed the 18th April 1879, and dated the 22nd October 1878.
PROVISIONAL SPECIFICATION left by the said James Chambers at the
Office of the Commissioners of Patents on the 22nd October 1878.
JAMES CHAMBERS, of the Stanton Iron Works, near Nottingham, in the County
of Derby, Foundry Manager. "IMPROVEMENTS IN CORE BARS FOR USE IN CASTING
METAL PIPES OR CYLINDERS."
In carrying out my improvements the cylinder or shell of the core is formed of
several segments, each extending about the length of the core. Two of these longi-
tudinal segments form opposite sides or surfaces, and these are capable of turning
on one of their edges on the edges of an intermediate segment. On the interior
surface of this intermediate segment are applied or formed projecting pieces, the
sides of which act against the inner surfaces of the first-mentioned segments to aid
in keeping them and the intermediate segment in correct relation.
These projecting pieces to the intermediate segment are formed inclined to act on
inclined surfaces formed at one edge of an internal longitudinal bar, the opposite
edge of which is formed with inclined or wedge-shaped surfaces to act on corre-
sponding edges of the side segments, by which when the longitudinal internal bar
is drawn in one direction the tendency thereof is to cause the parts to assume
externally a cylindrical form, and when the internal longitudinal bar is moved in
the opposite direction the tendency is to cause the collapsing of the whole.
Sand or core mould is applied to make up the correct external form of the core.
The internal longitudinal bar is provided with angular slots for the passage of
stay rods to the side seginents.

page_text: =SPECIFICATION-in pursuance-of-the-conditions-of-the-Letters Patent filed by
the said James Chambers in the Great Seal Patent Office on the 21st April
1879.
-JAMES-CHAMBERS, of the Stanton Iron Works, near Nottingham, in the County of
Derby, Foundry Manager. "IMPROVEMENTS IN CORE BARS FOR USE IN CASTING
-METAL PIPES-OR-CYLINDERS."
When using hollow core bars in forming moulds for the casting of metal pipes or
-cylinders it is desirable that such core bars be capable of reduction in size to admit
of their more casy removal from the pipe or cylinder after the casting, and various
efforts have been made in this direction, but hitherto so far as I have been able to
ascertain only with partial success, and the object of my Invention is by simplicity
in the construction or arrangement of the parts of such core bars to facilitate the
removal thereof after the casting thereon of the desired pipes or cylinders.
In carrying out my improvements the cylinder or shell of the core is formed of
several segments, each extending about the length of the core. Two of these longi-
tudinal segments form opposite sides or surfaces, and these are capable of turning
on one of their edges on the edges of an intermediate segment. On the interior
surface of this intermediate segment are applied or formed projecting pieces, the
sides of which act against the inner surfaces of the first-mentioned segments to aid
in keeping them and the intermediate segment in correct relation.
These projecting pieces to the intermediate segment are formed inclined to act on
inclined surfaces formed at one edge of an internal longitudinal bar, the opposite
edge of which is formed with inclined or wedge-shaped surfaces to act on corre-
sponding edges of the side segments, by which when the longitudinal internal bar
is drawn in one direction the tendency thereof is to cause the parts to assume
externally a cylindrical form, and when the internal longitudinal bar is moved in
the opposite direction the tendency is to cause the collapsing of the whole.
Sand or core mould is applied to make up the correct external form of the core.
The internal longitudinal bar is provided with angular slots for the passage of
stay rods to the side segments.
But that the Invention may be the better understood I will by the aid of the
accompanying Drawings proceed more fully to describe means pursued by me in
carrying the Invention into effect

page_text: seen that the edges b₁ of the portion or segment bare formed with projections
adapted to pass into corresponding recesses formed in the edges a, a, of the
segments a, so as to aid in keeping those parts of the respective segments a, a, and b
in correct relations.
There are also other projecting pieces b² applied to or formed on the part with
short screws 63 thereto adapted to pass into corresponding recesses formed for them
in side segments a, a, further to aid in preserving the correct relations of the parts.
These projecting pieces b² are also formed with inclined surfaces d to act upon other
inclined surfaces c¹ formed at one edge of the internal longitudinal bar c², the opposite
or outer edge of which is formed into the segment piece c, and the inclined edges c³
of the piece c are adapted to act on the correspondingly inclined edges a² of the
segments a, by which when the bar c² is drawn in one direction the edges c³ of its
outer surface or segment c will be borne against the corresponding edges a³ until all
the segments form externally a cylindrical surface; or when this bar c² is drawn in
the opposite direction, as when it may be desired to remove the core from a pipe or
cylinder that has been cast thereon, the tendency will be to cause the collapsing of
the side pieces a, a, and the movement of the segment c towards the segment b;
e, e, are stay rods to aid in preserving the correct relative positions of the parts a, a,
and they pass through suitably formed inclined openings c¹ provided for them in
the bar c2.
The external form of the core bar will be made up by the use of sand or core
mould in the usual way. ƒ and g are pivots for the support of the ends of the core
bar on suitable bearings to enable the core bar to be readily turned for the correct
formation of the sand or loam surface thereto; h is a clasp applied to turn on a
stud h applied to one segment, and which by its hooked end is adapted to hook
on to another stud on an opposite segment for the purpose of aiding to retain the
parts in correct relative position during use.
By thus forming the core bar by dividing the circumference of it into several
sections greatly increased facility is afforded in the removal of such core bars from
the interior of the pipes or cylinders that have been cast on them.
Having thus described any Invention and means which I adopt in carrying the
same into effect, I would have it understood that I do not confine myself to the
precise arrangements of parts as shown and described, as the same may be varied
without departing from the peculiar character of my Invention, but what I do
claim is, the arranging or combining segments a, a, b, and c, and parts connected
thereto, substantially as described for use in casting metal pipes or cylinders.
In witness whereof, I, the said James Chambers, have hereunto set my hand
and seal, this Eighteenth day of April, in the year of our Lord One
thousand eight hundred and seventy-nine.
JAMES CHAMBERS. (L.S.)