AN IMPROVED PROCESS OF MOULDING HOLLOW METALLIC PIECES PROVIDED WITH A SINGLE APERTURE, SUCH AS SHELLS, HOLLOW BAITS DOOD KEADS AND ART ARREATE A BASE DECORTA
Year: 1868

page_text: LETTERS PATENT to Alexandre Désiré Eugène Boucher, of Fumay,
Département. des Ardennes, in the Empire of France, Iron Founder,
for the Invention of "AN IMPROVED PROCESS OF MOULDING HOLLOW
METALLIC PIECES PROVIDED WITH A SINGLE APERTURE, SUCH AS SHELLS,
HOLLOW BAITS DOOD KEADS AND ART ARREATE A BASE DECORTA "
PROVISIONAL SPECIFICATION
left by the said Alexandre Désiré
Eugène Boucher at the Office of the Cominissioners of Patents,
with his Petition, on the 11th May 1868.
I, ALEXANDRE DESIRE EUGENE BOUCHER, of Fumay, Département des
Ardennes, in the Empire of France, Iron Founder, do hereby declare the
nature of the said Invention for "AN IMPROVED PROCESS OF MOULDING HOLLOW
METALLIC PIECES PROVIDED WITH A SINGLE APERTURE, SUCH AS SHELLS, HOLLOW
BALLS, DOOR KNOBS, AND ALL ARTICLES OF THE SAME DESCRIPTION," to be as
follows:-
Great difficulties are met with in obtaining hollow pieces of very.
regular thickness in cast metals when such pieces are provided with
[Price 6d.1

page_text: but a single aperture, the success of even the most skilful moulder being
uncertain.
The object of my Invention is to obtain such pieces as thin as may be
desired, and of a very regular thickness. The model of the hollow piece
to be moulded is laid on a sand bed as in the usual way, but the pro-
jecting hub intended for the core ("la portée du noyau," or core print)
instead of being inserted directly in the sand is surrounded by a movable
or fixed wrapper or envelope. The projecting hub of the core must be
long enough to project about one inch from the upper moulding sash,
frame, or box. The sand is squeezed in the mould as usual, and on
removing the model the projecting hub comes out with it, its wrapper
remaining in the sand being attached to the upper moulding sash. The
core is formed as usual around a skeleton, of which the shape and size
in the place corresponding to the projecting hub of the model are
exactly of the same size and shape as the latter. The core is then put
in the sash or moulding box before casting, no particular care being
needful, because the empty space through which it is slid is no longer
movable or easily deteriorated, but is an empty metallic space, and the
core cannot occupy any other place than that intended for it, the upper
part of the core is then fastened in the wrapper by means of a peg.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexandre Désiré Eugène Boucher in the Great
Seal Patent Office on the 11th November 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDRE
DESIRE EUGENE BOUCHER, of Fumay, Departement des Ardennes, in the
Empire of France, Iron Founder, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of May, in the year
of our Lord One thousand eight hundred and sixty-eight, in the thirty-
first year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Alexandre Désiré Eugène Boucher, Her
special licence that I, the said Alexandre Désiré Eugène Boucher, my
executors, administrators, and assigns, or such others as I, the said
Alexandre Désiré Eugène Boucher, my executors, administrators, and

page_text: instances pieces requiring to be light, stout, and cheap could not unite
all these qualities as they will do when made according to my
Invention.
The method of moulding according to my process is represented on
the annexted Sheet of Drawing, forming part of this my Specification,
similar parts being indicated by the same letters in each of the Figs.
respectively.
:
The model or pattern of the hollow piece to be moulded is laid on
a bed of sand as in the usual way, but the core print instead of being
laid directly in the sand is introduced in a casing or wrapper which may
be either moveable or attached to the upper part of the moulding flask
or frame accordingly as may be desired by the workman. The core
print or projecting hub and its casing must both be long enough to
project 2 or 3 eighths of an inch out of the flask, the sand being thrown
and beaten in the flasks A and B as usual; when they are opened to
take out the model the print comes out with the latter and the casing.
remains in the sand. If the casing is moveable it must be shaped with
external notches, as shown at L, Fig. 1, if on the contrary it is fastened
to the upper flask it remains naturally in the sand, which fits the said
flask whatever may be its shape, as shewn Fig. 2. The core S is formed
as usual around a core barrel the shape and size of which are exactly
similar to the core print of the model. Now to place the core exactly at
the position it is to occupy in the flask there is nothing else to do but
to enter the core barrel provided either with sand or clay, forming the
core in the casing, until its end touches a stop piece which is previously
placed at a suitable height. This putting the core in place does not
require any particular skill or caution since the vacant space left by the
core print is no more an empty space cut or printed in the sand, a
material without stability and easily broken or put out of shape, but the
core print is an empty space left in a metallic casing which cannot
crumble nor change its position. The core cannot occupy any other
place but that resulting from the position of the core barrel, which is
exactly that of the core print of the model, the place of which it takes in
the casing. The core is secured by means of a peg b, Figs. 1 and 2,
which runs through the casing and core barrel to prevent the latter
moving down; being thus secured it can move neither up nor down and
perfectly resists the pressure which the molten metal exerts on the core

page_text: on being poured into the mould. Now the core resisting the pressure
of the melted metal in all directions on account of the mode of securing
the core barrel the metal can better be poured when the core is turned
upwards, which will facilitate the escape of the arising gases. The most
important application of my process is for moulding hollow missiles,
such as shells or small bombs, the difficulty of obtaining which of a
regular thickness causes the rejection of a great number, whilst by my
process all of them will be good. Another important application of my
process is for the moulding of many small articles of household fitting
and furniture, such as door knobs, heads of balustrades, and all similar
articles.
Fig. 3 represents the moulding of a door knob, Fig. 4 being a cross
section; this modification consists in employing a fixed metallic casing
provided with a pressure screw V instead of the peg b previously
described, Figs. 1 and 2; the core barrel C, which was square shaped in
its whole length, is now round for the portion inserted within the casing;
it is provided with a ring E resting upon the upper part of the casing,
preventing the core coming down and the melted metal running in the
casing. I prefer to make the cores by mixing two kinds of sand, common
sand and hard or fire-sand.
The moulding of hollow pieces provided with a single aperture can be
performed in several ways, but my system of core barrel with casing can
always be used; it is important to remark that with this system the
model to be moulded can either lie, stand up, or be inclined in any
direction in the mould. It might perhaps be inferred from the Figs.
1, 2, and 3, that my system is applicable only when the model is standing
up in the sand, but its position is a matter of indifference. The Figs. 5
and 6 are to give a specimen of moulding in the horizontal position, a
door lock handle H being laid in the flask for moulding by means of
core barrel C and casing L. The wire pin P is placed in the sand before
pouring the metal in which it sticks.
In conclusion, I claim as my Invention the process of moulding
hollow pieces provided with a single aperture, as herein-before described,
by employing a moveable or steady casing made either of metal or any
other suitable hard material, the said casing being to receive the core
barrel which is attached to it either by means of a peg or an adjusting
screw, this process permitting the casting in a single piece and of any

page_text: metal of all hollow pieces requiring to be light, thin, and of a regular
thickness, substantially as described.
In witness whereof, I, the said Alexandre Désiré Eugène Boucher,
have hereunto set my hand and seal, this Fifth day of November,
in the year of our Lord One thousand eight hundred and sixty-
eight
Signed and sealed in the presence of
L. D'AUBREVILLE, C.E.
E. BOUCHER. (L.S.)