A NEW TOOL OR MOULD FOR MOULDING OR CASTING DISCS OR WHEELS REQUIRING TO HAVE LETTERS, CHARACTERS, NUMERALS, OR OTHER DEVICES OR DESIGNS FORMED AROUND OR ABOUT THEIR CIRCUMFERENCES IN METAL OR OTHER MATERIALS
Year: 1868

page_text: PROVISIONAL SPECIFICATION left by Louis Hannart and Nicolas
Alphonse Aubertin, at the Office of the Commissioners of Patents,
with their Petition, on the 29th September 1868.
We, LOUIS HANNART and NICOLAS ALPHONSE AUBERTIN, the younger,
both of King Street, Clerkenwell, in the County of Middlesex, do hereby
declare the nature of the said Invention for "A NEW TOOL OR MOULD
FOR MOULDING OR CASTING DISCS OR WHEELS REQUIRING TO HAVE LETTERS,
CHARACTERS, NUMERALS, OR OTHER DEVICES OR DESIGNS FORMED AROUND OR ABOUT
THEIR CIRCUMFERENCES IN METAL OR OTHER MATERIALS," to be as follows:-
The novelty of this Invention consists in so constructing a tool or
mould for the above purpose as that discs or wheels of metal or other
materials requiring to have letters, characters, numerals, or devices or
designs cast upon and around their peripheries, may have the same
formed by casting from an engraved pattern in any quantities, instead
of having to engrave the circumference of each disc or wheel separately
by hand as heretofore practised.

page_text: We propose to effect this by constructing the aforesaid tool or mould
in the following manner:-The bottom of the tool consists of a circular
flat plate of metal, upon which rests loosely another circular plate of
metal of smaller diameter than the former plate; this smaller plate is
formed with a fillet about its upper edge to serve as a shoulder for the
engraved dies to be forced against, and thereby to bring the segmental
dies, close together, so as to form them into an entire circular die or
mould; these segmental dies are each connected by a screw to the
bottom plate of the mould, the heads of the said screws each taking
into an oblique slot or groove formed in the said plate; grooves or slots
are also formed in the filleted plate above mentioned radiating from
the centre thereof, and into, each of these radial slots a pin takes, one of
such said pins being fixed into the under side of each segmental die..
There is a handle or lever fixed to each of the aforesaid plates for
turning such said plates partly round on their axis of motion, the said
axis consisting of a handle, the upper end of which is formed with a
shoulder and a screw pin, the top of which is formed conical or pointed,
and the barrel of the said screw is formed plain or smooth, and such
part passes through a hole of corresponding size formed in the bottom
plate; the upper plate has a screw hole formed theirein, into which is
screwed the aforesaid pin. The outer edges of the aforesaid dies are
formed bevilling, and over and around such part (when the dies are
drawn inwards) a circular bevilled ring of metal fits. The top of the
tool or mould consists of a plate of metal screwed to the aforesaid ring
and this plate of metal has a boss formed on the top side thereof, having
a hole through it of the size of the boss of the disc or whee! that is. to be
cast, space is also left between the cover of the mould and, the upper
plate thereof corresponding to the required thickness of the disc or wheel
to be cast. A lever with a smaller hole therein covers this hole, through
which the molten metal or other material is poured or run, and finally a
screw clamp holds the several plates firmly together. The mould having
been filled with and the casting made the operator then removes the clamp
and also the top of the mould, he then takes the two aforesaid
horizontal handles, one in each hand, and pushing them in opposite
directions effects the forcing back of the segmental dies, and thus
disengages them from the circumference of the casting, the conical
point before mentioned holding the casting steady in the centre of
the mould while the dies are being drawn back. The upper plate

page_text: aforesaid moving on its screwed axis rises slightly, and pushes the
casting out of the mould. The parts of the mould are then placed in
their normal position and the operations repeated as before, and so on
in succession.