THE METHOD OF CONSTRUCTING AND IN APPARATUS FOR SUPPORTING THE CORES, CHILLS, PINS, OR NUTS, EITHER BLANK OR PROVIDED WITH SCREW THREADS USED IN THE PRODUCTION OF CASTINGS, AND FOR IMPROVEMENTS IN THE MAKING AND MANUFACTURE OF CASTINGS MADE FROM IRON AND OTHER METALS."
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by John Watson at the Office of the
Commissioners of Patents on the 23rd March 1881.
"IMPROVEMENTS IN
JOHN WATSON, of Rotherham, in the County of York.
THE METHOD OF CONSTRUCTING AND IN APPARATUS FOR SUPPORTING THE CORES,
CHILLS, PINS, OR NUTS, EITHER BLANK OR PROVIDED WITH SCREW THREADS
USED IN THE PRODUCTION OF CASTINGS, AND FOR IMPROVEMENTS IN THE MAKING
AND MANUFACTURE OF CASTINGS MADE FROM IRON AND OTHER METALS."
My Invention relates to improvements in the construction, arrangement, and
method of supporting cores, chills, pins, or nuts, either blank or provided with
screw threads to be used in the production of castings for various purposes; the
object of my Invention being economy, durability, and accuracy in fitting together
such castings, and this result I attain by enabling castings to be made with plain
or tapped holes, the casting in of metallic pins and the chilling of wearing surfaces,
which results it has not been possible to accomplish heretofore on account of the
difficulty of moulding. My Invention is especially adapted to the castings of the
various parts of stoves, kitchen ranges, and similar articles, but it may also be
applied to machine castings and other castings.
In carrying out my Invention as applied to the castings of parts of a kitchen
range, for example, the plates of which are usually screwed together, the holes
being drilled and one of them tapped for the screw to engage in, according to my
Invention the position of the hole intended to be screwed is indicated by a recess
made in the sand by a print on the pattern, in which I place a short metallic stud
baving by preference a shoulder, and on the projecting end of which I place a
tapped nut of suitable outer construction, which is thus held firmly till the metal
of the casting is run round it, when it will be secured in the exact position
required. To produce a tapped hole at right angles with the draw of the pattern
from the sand the pattern has a tapered print which leaves a similar recess in the
sand, into which is placed a support with a projecting stud to carry a tapped nut,
as before described, which is thus held suspended while the casing is made. In
casting a nut into the end of a grate bar I prefer to support the nut between two
portions of a sand core, having a wire through its centre, the long end of the core
supporting the short end and the nut in the centre of the mould when cast; the
short end of the sand core can be shaken out through the hole in the nut. In

page_text: casting a wrought iron pin in the lugs of range front for an oven door to swing on.
I make the print of the lug sufficiently long that a portion of the space may
receive a chill inside which the part of the pin intended to be used is placed, the
shank being exposed in the mould so as to be surrounded with metal; the face of
the lug is hardened by coming in contact with the face of the chill, and the same &
chilling process being carried out in the casting of the oven door it follows that
there is great durability in the wearing parts.
By using chills with a prepared tapered hole into which the metal can be run
it is evident that chilled cast iron hinge pins for fire doors can be cast solid with
the lugs on the front, and by reversing this method and using a chill with a 1
projecting pin I am enabled to cast a door with lugs having chilled pin holes.