IMPROVEMENTS IN APPARATUS FOR CUTTING OR SHAPING MILLSTONES
Year: 1869

page_text: LETTERS PATENT to David Rivenc, of Geneva, Switzerland, Merchant,
for the Invention of "IMPROVEMENTS IN APPARATUS FOR CUTTING OR
SHAPING MILLSTONES,'
Sealed the 25th June 1869, and dated tho 21st January 1809.
PROVISIONAL SPECIFICATION left by the said David Rivene at the
Office of the Commissioners of Patents, with his Petition, on the
21st January 1869.
I, DAVID RIVENO, of Genova, Switzerland, Merchant, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IS APPARATUS
FOR CUTTING OR SHAPING MILLSTONES," to be as follows:-
This Invention consists of a longitudinal cast-iron arm fixed to the
surface of the stone to be cut or shaped by means of screws attached
to the driving shaft and resting on the stone by a wooden support
fixed by a nut screw. From the centre of this arm a cylindrical column
rises, bearing internally a socket on which and within the column
a second shaft turns. At the upper end of this latter are two pullics,
the uppermost one receiving motion from a driving shaft, whilst the

page_text: other transmits it to the cutting tool to be hereafter mentioned. Below
the second pulley is a movable support or bracket fitting by means
of a socket on the 'second shaft above referred to, and which serves
as an axis to it; this bracket may be raised or lowered as desired by
means of a ring and adjusting screw. The opposite end of this bracket
bears the axis of a lever, at the end of which are two conducting pullies
receiving motion from the uppermost pulley on the cylindrical column,
and transmitting it, directly to the cutting tool; the other end of the
lever bears a counterbalance for regulating the tension of the cord.
The opposite end of the arm (herein-before mentioned) to that bearing
the wooden support is cut sloping to fit a movable or sliding iron piece
for regulating the cutting operation; a cap or counter plate similarly
cut fixes the piece with a screw to the part of the arm desired. This
sliding piece is perforated longitudinally to receive a screw and guide,
cach having at its end a metal plate furnished with head screws working
in a bow or aro cut in a piece of metal serving as conductor to the cutting
tool; the screw before alluded to bears a toothed wheel actuated by
a double click lever, which latter is regulated by a movable stay or
detent. On the conductor a small groove is made to receive the guide
of the frame of the porte-diamond or cutting tool. This latter frame
consists of two parts, that is to say, the body and
the cutting tool or porte-diamond; the body of this
at right angles at each side, and bears on either side a screw, one
of which is fixed and the other movable, and serving as axes to
the part supporting the diamond. By the foregoing it will be
remarked that the means employed for cutting the millstones is by
the use of diamonds in a rough state. The part bearing the cutting
tool or porte-diamond has its ends terminating in two arms, bearing
at the end of each a shaft slightly hollowed to receive the two ends
of the shaft carrying the diamond; the object of these shafts is to
give the necessary amount of play to the cutting tool or porte-diamond:
That part of the shaft receiving the diamond is provided with a counter
plate which secures the diamond by aid of a screw. The body of
the frame supporting the part bearing the cutting tool is set in motion
by means of a handle, which allows the workman to see how the tool
cuts, the apparatus being so arranged as to act outside the millstones.
.
that which bears
frame is elbowed

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said David Rivenc in the Great Seal Patent Office on
the 15th July 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, DAVID
RIVENO, of Geneva, Switzerland, Merchant, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-first day of January, in tho year
of our Lord One thousand eight hundred and sixty-nine, in the thirty-
second year of Her reign, (lid, for Herself, Her heirs and successors,
give and grant unto me, the said David Riveno, Her special licence
that I, tho said David Rivenc, my executors, administrators, and
assigns, or such others as I, the said David Rivene, my executors,
administrators, and assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, tho Ohannel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN APPARATUS
FOR CUTTING OR SHAPING MILLSTONES," upon the condition (amongst others)
that I, the said David Riveno, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and
scals, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed,
and cause the same to be filled in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said David Riveno, do hereby declaro
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement and accompanying Drawings, that is to say:-
The object of the present Invention is to advantageously replace
the means or apparatus at present employed for cutting and shaping
millstones with an economy of time, labour, and expense, as hitherto
there have been few mechanical contrivances adapted for the purpose
that are not either too complicated or expensive.

page_text: One of the principal features of the Invention is the use of rough
diamonds or other hard stones for cutting the millstones, such as have
already been employed in tunneling.
The apparatus represented in different positions in the accompanying
Drawings consists of two parts, first, the apparatus itself, and, secondly,
a movable frame turning on its axis with the greatest rapidity, bearing
the cutting tool or diamond. The body A of the apparatus, a side view
of which is shown by Fig. 6, and a plan Fig. 7, is of cast iron, and
is fixed (by means of screws attached to the driving shaft A¹) on the
surface of the stone to be cut. From the centre of the frame a
cylindrical column c rises, bearing at its lower end interiorly a socket o
on which a second shaft (passing through the first named) turns. This
latter shaft B bears on its upper end two pullies D and E; the top
one D receives motion from a driving shaft, the other E transmits
the necessary movement for cutting the stone. As shown in the plan
Fig. 7 of the Drawings, the upper part of the column has a movable
support F in cast iron turning by means of a hollow cylinder or
socket G (Fig. 6) round the column, which serves as an axis with
a ring H fixed at will by means of a screw. The other end of the
support bears the axis I of a lever L, having at one end J two con-
ducting pullies receiving motion from the pulley D by aid of a cord
and transmitting it directly to the "porte-diamond" or cutting tool;
the other end of the lever bears a movable counterbalance K acting
as desired on the lever for regulating the tension of the cord. The
frame A rests on the stone by means of a wooden or iron support M
fixed by a nut screw and forming part of the frame; wood is prefered,
as it does not slip or slide so much on the stone whilst the latter is
being cut; the other end of the frame is cut sloping so as to fit in
an iron piece N, which is capable of moving from n to n' for the
better execution of the work. A cap or counter plate N¹ cut in a
similar manner on the side next the frame fixes the piece N by means of
a screw to the desired part of the arm A of the frame. This piece N
is perforated longitudinally for receiving the screw P and guide R,
the one and the other bearing at their extremities a metal plate Q
supplied with a head screw o working in a bow or arc, cut in the
piece S, which is the conductor of the porte-diamond, the object
being to give the requisite slope to the apparatus. The screw P bears

page_text: a toothed wheel T actuated by means of a double click lever. A movablo
stay regulates the exact distance of the lover. On the conductor S
a small grooves is made for receiving the guide of the frame of the
porte-diamond or cutting tool. This frame consists of two parts
shown in Fig. 1, that is to say, the body U and the part X bearing
the cutting tool Z; the part U is elbowed at each side at right angles,
and at each side a screw V and V is placed, the latter being fixed
and the former movable and supporting the part X bearing the cutting
tool, which latter pivots on these screws which serve as axes to it.
The side 8 of the frame bears a metal band fixed by a screw acting
as a guide and fits in the grooves which carries the conductor S
already mentioned. The part X is guided by a nut or tumbler screw for
regulating the cutting of the diamond. The extremities of the two
arms b, b, of the part X bear two shafts c, c', the heads of which
aro slightly perforated for the reception of the two ends of the porte-
Camond Z. These two shafts cand c', one of which c is fixed and
the other c movable (and fixed in its socket by means of a screw),
have the object of giving to the shaft Z just sufficient play after
having itself been fixed by aid of a spring r. The part of the shaft
which receives the diamond bears a counter plate which fixes tho
diamond by means of the screw e. The part U is set in motion by
hand by aid of the handle P³, which allows the workman at any
time to see how the diamond is cutting, an advantage which has not
yet been attained by other contrivances, and the arrangement of the
diamond is such that it cannot get out of position. Fig. 4 shows a
foot which is fixed in the centre opening of the stone from above
by means of the screws v, v, v; this foot replaces the driving shaft
of the lower stones, serving to fix the frame of the apparatus.
I wish it to be understood that the frame, the column, and shaft
which it contains, as well as the frame bearing the cutting tool, as well
as the latter itself, may vary in form and dimensions without departing
from the principle, motion being transmitted directly to the cutting
tool by the same means, the apparatus, being so arranged as to act
on the surface of each millstone.

page_text: column and its shaft, in the use of the lever, the frame bearing the
cutting tool, the cutting tool, and the conductor to the frame.
In witness whereof, I, the said David Rivenc, have hereunto set
my hand and seal, this First day of July, in the year of our
Lord One thousand eight hundred and sixty-nine.
Witness,
E. HEBRÉ.
DAVID RIVENC. (L.s.)