IMPROVEMENTS IN THE PRO- DUCTION OF MOULDING PLATES USED IN MAKING MOULDS FOR CASTING METALS.
Year: 1878

page_text: LETTERS PATENT to John Whitehouse, of Birmingham, in the County of
Warwick, Manufacturer, for the Invention of "IMPROVEMENTS IN THE PRO-
DUCTION OF MOULDING PLATES USED IN MAKING MOULDS FOR CASTING
METALS.'
"
Sealed the 23rd August 1878, and dated the 14th March 1878.
"
PROVISIONAL SPECIFICATION left by the said John Whitehouse at the Office
of the Commissioners of Patents on the 14th March 1878.
JOHN WHITEHOUSE, of Birmingham, in the County of Warwick, Manufacturer.
IMPROVEMENTS IN THE PRODUCTION OF MOULDING PLATES USED IN MAKING
MOULDS FOR CASTING METALS."
My Invention has reference to the moulding plates used in making sand moulds
for casting articles in brass, iron, and such other metals and alloys as are or inay be
cast in sand moulds.
In making the said moulding plates according to my Invention I proceed as
follows: I take a half mould box and place it upon a base board or plate having
two pins projecting from it to a height greater than the depth of the mould box; I
then fill the half mould box with tempered clay. I press the pattern article into the
clay until one half of it is imbedded therein; I then place another half mould box
upon the one containing the clay and pattern, and fill the same with plaster of Paris
prepared in the usual way. There is thus produced a cast in plaster of Paris of one-
half of the pattern article, the casting having in it two holes produced by the pins
described. The whole is inverted, the half mould box containing the clay removed,
and another half mould box placed therein, and another cast in plaster of Paris is
made of the other half of the pattern. Each casting in plaster of Paris is placed
on a base plate having pins in such positions that they pass through the holes in
the plaster. The casting in plaster of Paris is supported above the base plate at a
height equal to the thickness of the pattern or moulding plate to be produced.
Type metal or other easily fused metal or alloy being poured in the space betweed
[Price 6d1

page_text: the base plate and the plaster a metallic casting is thus obtained, consisting of a
metal plate with the half pattern upon it. In this way two half pattern or
moulding plates are obtained, having the same thickness, and having holes in the
same positions. A number of these single half pattern or moulding plates may be
fixed on a common base plate by headed screw pins passed downwards through
holes therein, and fixed underneath by screw nuts. From pattern or moulding
plates thus made sand moulds may be made in the usual way.
When large numbers of the same articles are to be cast, full sized half pattern or
moulding plates, having the required number of the pattern articles upon thein,
may be formed by the process described, instead of forming a number of small
pattern or moulding plates to be fixed on a common base plato...
When hollow articles are to be cast, and one-half of the pattern is convex and
the other concave, the box on which the plaster of Paris is cast is made deeper than
is required for ordinary solid articles.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Whitehouse in the Great Seal Patent Office on the 6th Sep-
tember 1878.
JOHN WHITEHOUSE, of Birmingham, in the County of Warwick, Manufacturer.
"IMPROVEMENTS IN THE PRODUCTION OF MOULDING PLATES USED IN MAKING
MOULDS FOR CASTING METALS."
My Invention has reference to the moulding plates used in making sand moulds
for casting articles in brass, iron, and such other metals and alloys as are or may be
cast in sand moulds.
In making the said moulding plates according to my Invention I proceed as
follows: I take a half mould box and place it upon a base board, and fill the said
half mould box with sand, tempered clay, or other moulding material. I press the
pattern article into the sand or moulding material until one half of it is embedded
therein. I then place another half mould box upon the one containing the pattern,
and fill the same with sand or other moulding material in the usual way. There is
thus produced in the last-described mould box a mould or matrix in sand or other
moulding material of one-half of the pattern article. The half mould is removed
from the half mould box containing the pattern, and the latter being removed a
mould of the other half of the pattern is produced. Each half mould or matrix is
placed on a base plate having holes in it in such positions that they agree with holes
in the mould; by means of pins passed through these holes the mould and base plate
are fixed together. The mould is supported above the base plate at a height equal to
the thickness of the moulding plate to be produced; or instead of supporting the
mould above the base plate the base plate may rest upon the mould, the base plate
having in it a trough or depression of a depth equal to the thickness of the moulding
plate to be produced. Type-metal or other easily fused metal or alloy being poured

page_text: in the space between the base plate and the mould a metallic casting is thus
obtained, consisting of a metal plate with the half pattern upon it. In this way
two half pattern or moulding plates are obtained, having the same thickness, and
having holes in the same positions. A number of these single half pattern or
moulding plates may be fixed on a common base plate or frame by headed screw
pins passed through holes therein and fixed by screw nuts. From pattern or
moulding plates thus made sand moulds may be made in the usual way.
When large numbers of the same articles are to be cast, full sized half pattern or
moulding plates, having the required number of the pattern articles upon them, may
be formed by the process described, instead of forming a number of small pattern or
moulding plates to be fixed on a common base plate.
I will now proceed to describe, with reference to the accompanying Drawings, the
manner in which the same is to be performed.
In making a moulding plate according to my Invention I take a moulding box or
flask of the kind represented in plan, cross section, and partly in longitudinal
section, and partly in elevation in Figure 1, the said box having holes marked a, a,
at its ends. I place the box, Figure 1, upon a base board or plate, and fill the said
box with sand, tempered clay, or other moulding material, and I press the series of
patterns to be moulded into the said sand or moulding material until one-half of
them is embedded therein. A moulding box with the half patterns embedded in it
is represented in plan in Figure 2, and longitudinal section in Figure 3, and is
marked b, and the patterns are marked c. I next place upon the half moulding
box b, Figures 2 and 3, containing the patterns c a second half mould box, similar
to the box b, as represented in the said Figures 2 and 3, the second inould box being
marked d, and having fixed the two mould boxes b and d together by passing
pins e, e, through the coincident holes at a in them, I fill the upper mould box d
with sand or other moulding material. The sand is rammed in the half mould
boxes b, d, in the usual way of making sand moulds. The pins e, e, are now with-
drawn from the two half mould boxes b, d, and the said boxes are inverted, so as to
bring the box b uppermost. The said box b is now removed from the mould box d.
A mould or matrix of the half patterns standing above the sand in the box bis
thereby produced in the mould box d, and by removing the patterns c from the
said box b a mould or matrix of the other half of the patterns is produced in the
said box b.
I make a moulding plate from each of the said moulded half patterns in the
boxes band & in the following way-I take a rectangular base plate of the kind
represented in plan, cross section, and longitudinal section in Figure 4, and marked f,
the said plate having in it a trough or depression g of a depth equal to the thick-
ness of the moulding plate to be produced. The longitudinal marginal edges ƒƒ³,
of the base plate are made smooth by planing, and the length of the moulding
plate is determined by cross pieces h, h, fixed in the groove or depression g near the
ends of the base plate. Near each of the cross pieces hare two holes i, k, the holes i, i,
being for the purpose of receiving the pins fixing herein-after described, and the
other holes h, k, serve as vent holes, and for producing the required head of inetal
cast in the trough g. In the middle of the base plate f is a circular hole for
receiving the pouring or filling cup m, shewn separately in section, elevation, and
plan in Figure 5.
I will now describe the manufacture of a moulding plate by the use of the mould
or matrix in the mould box d, Figure 2, and the base plate represented in Figure 4.
I take the mould box d with the half mould in it, and having inverted it, as before
described, place upon the top of the said mould box d the base plate f, and fix it
thereon by passing pins e, e, through the holes i, i, in the said base plate f, and
through the holes u, a, in the mould box d, as represented in longitudinal section
and cross section in Figure 6. Having fixed the pouring or filling cup m in the
middle of the base plate f, the mould is ready for the casting of a half moulding
plate, the space between the top of the mould in the box & and the top of the
trough or channel in the base plate f being equal in thickness to the plate part of

page_text: the moulding plate to be produced. Type motal or other easily fused metal or
alloy being poured into the filling cup m, it passes into the space between the
mould & and the base plate f, and a metallic casting is thus obtained, consisting of
metal plate having upon one side of it the half pattern moulded in the box d. The
type or other metal or alloy run into the mould d and between the base plato f and
the mould is represented by black parts in Figure 6. After the casting has set, the
pins e, e, are removed, and the base plate f and moulding plate lifted from the mould
box d.
Figure 7 represents in plan, longitudinal section, and end elevation a moulding
plate which has been produced in the manner described. The said moulding plate,
Figure 7, has a rib n at one edge for forming the runner or get in the mould to bo
produced by the use of the said moulding plato. This rib is made on the moulding
plate from the pattern placed in the moulding box b, from which the impression of
the moulding plate is taken. The moulding plate, Figure 7, has at its ends holes p, p,
for fixing it, when a compound moulding plate is required to be used on a moulding
frame, as herein-after described. The other half moulding plate is made from the
half mould in the box b, in the manner described with respect to the half mould in
the box d.
When a series of the same or different moulding plates are required to be con-
nected together so as to form a compound moulding plate, I connect the separate
moulding plates to a frame of the kind represented in elevation, plan, and cross
section in Figure 8. The said frame has a series of rectangular openings q, q, in it,
a little less in size than the moulding plates to be fixed together. Upon the said
frame are dowel pins r, r, upon which dowel pins holes in the moulding boxes used
for moulding from the compound moulding plate take. At the ends of the frame-
like openings 9, q, in the frame, Figure 8, are holes agreeing in position with the
holes p, p, in the moulding plate to be fixed. Having laid the pattern plates upon
the frame, Figure 8, so that the holes p, p, in the moulding plate, Figure 7, are
opposite the holes 8, 8, in the frame, screw pins are passed through the coincident
holes in the frame and moulding plate and fixed by fly nuts. In the cross section
of Figure 8 a moulding plate marked t is represented fixed over one of the
openings q in the frame by the screw pins r and fly nuts u.
Figure 9 represents in plan a compound moulding plate which has been made in
the manner described. The patterns from which the runners or gets in the mould
are produced are marked in Figure 9. .
The moulding frame may be without openings, except for such patterns as are
convex and concave.
When hollow articles are to be cast, and one half of the pattern is convex and
the other half concave, the pattern projecting from both sides of the moulding plate,
I use in place of the base plate, Figure 4, a frame-like plate, connected with or made
in one piece with a mould box for holding the sand or other moulding material in
which parts of the moulding plate is cast.
Figure 10 represents in longitudinal section, and cross section, and plan, a frame-
like base plate, with its mould box made according to this part of my Invention;
and Figure 11 represents the lower half mould, base frame, and top mould arranged
for the casting of a moulding plate. The inner end of the frame y at the base of
the box 1 is furnished with a recess or depression of a depth equal to the thickness
of the plate of the moulding plate to be cast. After making the half mould in a
moulding box similar to the box d, Figure 6, I fill the top mould box 1, Figuro 11,
carrying the base frame y with sand or other moulding material, and form depressions
in the said sand or material of the figure of the exterior of the pattern to be
produced on one side of the moulding plate. I then place the combined base frame
and box 1, y, upon the lower half mould d, and secure the two boxes together, as
illustrated in Figure 11. There is thus formed between the two half moulds in the
boxes d, 1, and frame y a space having the figure of the counterpart of the pattern
and plate to be formed. By pouring type or other metal through gets at 2 in the
top mould 1, or through gets in the frame y, the space between the two moulds is.

page_text: filled with the said type metal, and a moulding plate thereby cast, having one-half
of the pattern convex and the other half concave, the hollow pattern projecting
from both sides of the plate. The black parts in Figure 11 represent a moulding
plate which has been cast in the mould and the "get" pieces of the same.
From the moulding plates, single or compound, made as described and represented,
the sand moulds are made in the usual way.
Having now described the nature of my Invention, and the manner in which the
same is to be performed, I wish it to be understood that I claim as my Invention,
the improvements in the production of moulding plates used in making sand moulds
for casting metals herein-before described, and illustrated in the accompanying
Drawings, that is to say, producing metallic moulding plates for the purpose
described by the process, or combination of processes, in conjunction with the
apparatus or appliances herein-before described and illustrated.
In witness whereof, I, the said John Whitehouse, have hereunto set my
hand and seal, this Fourth day of September, in the year of our Lord One
thousand eight hundred and seventy-eight.
Witness,
RICHARD SKERRETT,
Clerk to George Shaw,
Birmingham.
JOHN WHITEHOUSE (Ls.)