Improvements in Making Moulds and Cores for Casting, and in Apparatus therefor.
Year: 1892

page_text: Date of Application, 19th Dec., 1892
Complete Specification Left, 16th Sept., 1893—Accepted, 21st Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Making Moulds and Cores for Casting, and in
Apparatus therefor.
We, WILLIAM DRENNAN, of 15 Rosendale Road, Pollokshaws, in the County
of Renfrew, North Britain, Ironfounder, and JOHN DICK, Junior, of Clifton Hill
Foundry, Coatbridge, in the County of Lanark, North Britain, Ironfounder, do
hereby declare the nature of this invention to be as follows, that is to say :-
This invention has for its object the construction of simple and effective
apparatus for forming moulds and cores, in an improved manner, for casting
articles of certain forms.
In carrying out the invention in the case of a mould for casting au ingot mould,
for which application the improvements may be advantageously employed, a mould
box is used which is preferably of a form and size such that the thickness of sand
or mould material may be the same at all parts of the mould for the outside of the
ingot mould. The mould box, which is made with a taper parallel to the taper of
the ingot mould, is placed vertically on a table, to which it is secured by locking
levers arranged to be turned in upon a flange formed at the bottom of the mould
box. The pattern, which is of a tapered form, is placed with its larger end down-
wards and rests on the rain of a vertical hydraulic cylinder placed below the table.
When about to make a mould the pattern is placed with its lower end some
distance below the table; and on the top of it there is placed a removable
continuation piece extending up to at least the top of the mould box. The sand is
filled into the space between the pattern and the mould box; and then the pattern
is forced up by means of the hydraulic cylinder, this operation producing a suitable
compression of the sand in consequence of the action of the larger dimensions of
the lower parts of the tapered pattern. At the top of the mould box the sand is
confined by segmental contour plates which being set in contact with the pattern
at starting move outwards as the pattern is being forced up. And at the bottom
of the mould box, and in suitable guides on the table, there are fitted four or other
suitable number of segmental contour plates, which are capable of moving inwards
and outwards. When the pattern is in its lowered position the plates are pushed
inwards into contact with the pattern so as to prevent the dropping through of the
sand; and as the pattern rises the plates are gradually moved outwards by the
action on them of the sides of the pattern.
When the sand has been compressed the top continuation piece of the pattern is
taken off, the pattern is lowered sufficiently to become free from the mould, and
the mould box with the mould formed in it is lifted off by means of a crane.
Small holes are formed in the sides of the mould box for the escape of air or gas
during the casting operation.
The core for the ingot mould is formed in precisely the same way, but the core
box is made in halves, which after the sand has been compressed, are separated and
removed leaving the sand upon the core bar, (which corresponds to the pattern of
the arrangement hereinbefore described). The core bar is made hollow and with
perforations for the escape of air or gas into it during the casting operation.
The improved arrangements and apparatus are applicable in the cases of various
articles of tapered form, or of any admitting of a tapered pattern or equivalent
piece being forced in, in a manner to compress the sand or mould material.
Dated this Seventeenth day of December 1892.
EDMUND HUNT,
Applicants' Agent.

page_text: COMPLETE SPECIFICATION.
Improvements in Making Moulds and Cores for Casting, and in
Apparatus therefor.
We, WILLIAM DRENNAN, of 15 Rosendale Road, Pollokshaws, in the County
of Renfrew, North Britain, Ironfounder, and JOHN DICK, Junior, of Clifton Hill
Foundry, Coatbridge, in the County of Lanark, North Britain, Ironfounder, 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, that is to say :-
This invention has for its object the construction of simple and effective
apparatus for forming moulds and cores, in an improved manner for casting articles
of certain forms.
In carrying out the invention in the case for example of a mould for casting an
ingot mould, a taper mould box is used and is secured vertically on a table. The
pattern which is of a tapered form, is placed with its larger end downwards and
rests on the ram of a vertical hydraulic cylinder placed below the table. The sand
is filled into the space between the pattern and the mould box and is confined at
the top and bottom by seginental contour plates which being set in contact
with the pattern at starting move outwards as the pattern is forced up by the
hydraulic ram to compress the sand; on which having been done the pattern is
lowered sufficiently to become free from the mould, and the mould box with the
mould formed in it is lifted off by means of a crane.
The core for the ingot mould is formed in precisely the same way; but the core
box is made in halves, which after the sand has been compressed are separated and
removed leaving the sand upon the core bar.
And in order that the said invention and the manner of performing the same
may be properly understood we hereunto append a sheet of explanatory drawings,
to be hereinafter referred to, and showing our improved apparatus for making
moulds and cores for casting.
Figure, 1, of the drawings is a plan of the mould box and its accessory parts.
Figure, 2, is a vertical section of the apparatus.
Figure, 3, is a horizontal section of the apparatus shown in Figure, 2, as taken
a little above the bottom of the mould box.
Figure, 4, is a sectional plan showing a detail.
Figure, 5, is a vertical section of the apparatus as arranged for making cores for
ingot moulds.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
.
In carrying out the invention in the case of a mould for casting an ingot mould,
for which application the improvements may be advantageously employed, a mould
box, A, is used which is preferably of a form and size such that the thickness of
sand or mould material may be the same at all parts of the mould for the outside
of the ingot mould. The mould box, A, which is made with a taper parallel to
the taper of the ingot mould pattern is placed vertically on a table, B, to which it
is secured by locking levers, C, arranged to be turned by hand in upon a flange, D,
formed at the bottom of the mould box. The pattern, E, which is of a tapered
form, is placed with its larger end downwards and rests on the ram, F, of a
vertical hydraulic cylinder, G, placed below the table, B. When about to make a
mould the pattern, E, is placed with its lower end some distance below the
table, B; and on the top of it there is placed a removable continuation piece, H,
extending up to at least the top of the mould box, A. The sand, J, is filled into
the space between the pattern, E, and the mould box, A; and then the pattern, E,
is forced up by means of the hydraulic cylinder, G, this operation producing
suitable compression of the sand, J, in consequence of the action of the larger
dimensions of the lower parts of the tapered pattern. At the top of the mould
a

page_text: box, A, the sand, J, is confined by segmental contour plates, K, which being set
in contact with the pattern, E, at starting move outwards as the pattern is being
forced up by the hydraulic cylinder, G, to compress the sand. And at the bottom
of the mould box, A, and between suitable guide blocks, L, adjustably fixed on the
table, B, there are fitted four or it might be any other suitable number of
segmental contour, plates, M, which are capable of moving inwards and outwards.
When the pattern, E, is in its lowered position the plates, M, are pushed inwards
into contact with the pattern so as to prevent the dropping through of the sand, J ;
and when the pattern, E, rises the plates, M, are gradually moved outward by
the action on them of the sides of the pattern as it is forced upward by the
hydraulic ram, F. When the contour plates, K, and, M, respectively at the top
and bottom of the mould box, A, are being moved outwards by the pattern, E, a
space is left between the corners of adjacent plates; and to prevent the sand, J,
dropping through these spaces there is provided for each corner a thin plate, N,
shown in Figure, 4, as when the plates, M, have moved apart. Each plate, N, is
fixed to one of the contour plates, M, and fits into a shallow recess, P, formed in
the other contour plate, and partly in the guide plate, L. The plates, N, move
out and in with the contour plates, M, to which they are fixed and effectually
prevent any of the mould material from dropping through. With some kinds of
mould material the covering plates, N, may not be required.
When the sand, J, has been compressed the top continuation piece, H, of the
pattern, E, may be taken off, the pattern is withdrawn sufficiently to become free
from the mould, and the mould box, A, with the mould formed in it is lifted off by
means of a crane. Small holes, Q, are formed in the sides of the mould box, A,
for the escape of air or gas during the casting operation.
Referring to Figure, 5, the core for the ingot mould is formed in precisely the
same way; but the core box, R, is made in halves, which after the sand, J, has
been compressed, are separated and removed, leaving the sand upon the core
bar, S, (which corresponds to the pattern, E, of the arrangement herein before
described). The core bar, S, is made hollow and the perforations, T, made in it
for the escape of the air or gas into and through it during the casting operation
are inclined inwards in an upward direction to prevent the sand from plugging
them when the core bar, S, is being forced upward.
The improved arrangements and apparatus are applicable in the cases of various
articles of tapered form or of any admitting of a tapered pattern or equivalent
piece being forced in, in a manner to compress the sand or mould material.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
1. The construction, arrangement, and combination of parts constituting the
improved apparatus for making moulds for casting, substantially in the manner
herein before described with reference to Figures, 1, 2, 3, and, 4, of, the accom-
panying drawings.
2. The construction, arrangement, and combination of parts constituting the
improved apparatus for making cores for casting, substantially in the manner
hereinbefore described with reference to Figure, 5, of the accompanying drawings.
3. In making moulds or cores for casting, means for forcing in a tapered
pattern or core bar in a manner to compress the sand or mould material in the
mould box or core box, combined with adjustable segmental plates arranged to be
moved outwards by the pattern or core bar substantially as hereinbefore
described.
Doted this Wifteenth day of Santamber 1802
EDMUND HUNT,
Applicants' Agent.