An Improved Core for Use in Casting the Bore or Interior of Ordnance and the like.
Year: 1889

page_text: Date of Application, 28th May, 1889-Accepted, 20th July, 1889
COMPLETE SPECIFICATION.
An Improved Core for Use in Casting the Bore or Interior of
Ordnance and the like.
I ALFRED CLAYTON COLE of the firm of W. H. Cole and Company of 85 Grace-
church Street in the City of London Merchants do hereby declare the nature of this
invention which has been communicated to me from abroad by Charles Henry Wilder
of Natick in the County of Middlesex and State of Massachusetts United States of
America Gentleman 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 a device for forming the bore or interior of ordnance or
analogous articles when the same are made from metal by casting and its object is
to produce such a casting with a bore smooth and free from cracks, flaws and other
defects now ordinarily found.
In carrying out this Invention a core is formed of the shape and dimensions
required for the bore of the article to be cast which core consists of an outer shell of
coke the exterior of which is of the form of the bore to be produced in the cast article
an inner or central metallic tube or pipe corresponding in length to the coke shell
and an annular filling of sand interposed between the coke shell and the tube.
For convenience in manufacture and manipulation the outer shell of coke may be
made of a number of sections fitted to each other while the inner tube or shell will
preferably be constructed of iron or other suitable metal, and in one piece. This
tube acts as a support or stay for the shell and sand filling and its interior may be
used to conduct a flow of water or other liquid to cool the cast metal after the casting
has been performed. The filling of sand between the shell and tube serves to sustain
the shell against the pressure of the melted metal.
In the accompanying drawings 1 have represented at Figure 1 a perspective
view of a cylinder section of coke, several of which put together make up the outside
coke shell.
Figure 2 shews a view of another coke cylinder the top of which is fitted to
enter the bottom of the cylinder of Fig. 1.
Figure 3 shews in vertical longitudinal section a portion of the core, including
two sections of the coke cylinder, the central tube, and the intermediate filling of
sand.
Figure 4 shews in plan the outer shell, the sand filling and the inner tube.
The outer shell of coke is marked a, the joint between two sections of the outer shell
is represented at a¹; the central tube is marked a² and the annular sand filling a
A convenient method of forming or moulding the coke for the outer cylinder is by
first grinding it, then mixing it with pitch or coal tar into a plastic mass; then
moulding it in suitable moulds to give it the desired form to produce the bore of the
article to be cast; and lastly, heating the formed coke in a mass of sand in a closed
furnace until the whole is re-coked whereupon, upon being cooled, it is ready
for use.
The improved core is intended to be used in a vertical position and in connection
with a vertical mould for forming the outside of the article to be cast. After the
casting has been made and has cooled, the outside of the mould may be removed,
the inner tube of the core may be withdrawn and the outer coke tube and sand
may be removed in any convenient manner.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
TUL L

page_text: articles, it consisting in an outer shell of coke, a central tube, and a filling of sand
between the shell and the tube all substantially as herein before described.
Dated this 28th day of May 1889
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.