IMPROVEMENTS IN MILLSTONES FOR GRINDING CORN AND OTHER SUBSTANCES
Year: 1874

page_text: ‘LETTERS PATENT to Jules Aubin, of Rue de Rivoli, No. 146, at
Paris, Miller, for the Invention of "IMPROVEMENTS IN MILLSTONES
FOR GRINDING CORN AND OTHER SUBSTANCES."
Sealed the 15th December 1874, and dated the 23rd June 1874.
PROVISIONAL SPECIFICATION left by the said Jules Aubin at the
Office of the Commissioners of Patents, with his Petition, on the
23rd June 1874.
I, JULES AUBIN, of Rue de Rivoli, No. 146, at Paris, Miller, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
MILLSTONES FOR GRINDING CORN AND OTHER SUBSTANCES," to be as follows:-
My Invention has for its object improvements in the system of mill-
stones which I have specified in my preceding Patent dated the 16th
day of November 1864, No. 2862, and which consists in the arrange-
ment of a cast-iron trough or platform surmounted by tubes with a
filling of grinding stones between the tubes, in order thus to constitute

page_text: the body of the millstone. The tubes are inclined in relation to the
direction of the platform, and upon the upper part of each a moveable
box provided with a metallic cloth or wire gauze or other means of
sifting is placed. This millstone comprises then a metallic platform
serving as a seat for the grinder, subdivided into several compartments
all alike and symmetrically directed, in order to constitute as many
orifices for ventilation and sifting for the passage of the floor.
¡ The first part of my present improvements relates to a new arrange-
ment for the purpose of giving to the metallic cloths or wire gauze a
vibratory movement free from deterioration and excessive wear and tear,
capable of easy application to existing millstones, while preserving to
cach pair of the latter their ordinary appearance.
.
The second part of my improvements consists in adding beneath the
hopper (anche) through which the bran falls, as well as beneath the
conduit through which the flour proceeds, a system of sifting intended
to extract the little particles or rednesses which may have got through
the metal compartments. This sifter which is of metallic, textile, or
animal cloth of a finer texture than that of the boxes, serves at the
same time to refine the flour. I also arrange an independent aspirator
in order to prevent the grinding from cumbering the stone and choking
the return chamber, and thus I facilitate by the aid of the sifting the
passage of the flour through the sifting boxes.
The third part of my improvements consists in disposing regularly in
the construction of the mill oblique rays of wood, plaster, lubricated
metal, or other material constituting temporary partitions in the grind-
ing stones, which the workman collects and cements into the said
partitions. These rays or forms of wood or other material remain in
the millstone until the fixing or hooping up is accomplished and the
mass has become quite dry, then only are these rays removed either by a
screw bit, a chisel, or in any other convenient way, and so leave between
the cemented and fixed-in stones regular spaces having exactly the same
form as the rays of wood or other material, and able thus to serve for
the direct sifting of the flour. With this modified arrangement there is
no need of the cast-iron platform nor of supporting partitions. The
spaces thus formed in the stone can receive boxes or frames of wire
gauze in order to effect the sifting, and the millstone is mounted into
its place in the usual manner.

page_text: According to the first and second parts of my improvements the mill-
stone is composed of a trough coming from the casting with projections
which constitute as many hollow compartments. This trough serves as
a seat or setting for the grinding stone which fills the interstices
between the compartments and forms the active body of the mill. The
sifting compartments or chambers receive at their upper part the
sifting boxes. These boxes are cast with a kind of perpendicular tail or
rod intended to serve as the intermediary for the sifting motion between
the organ of action and the metallic boxes. This organ is a sort of lever
with a free joint upon a support fixed beneath the acting stone. Each
box has its lever arranged so as to be able to strike upon the corre-
sponding vertical rod. Lower down there moves freely upon the axis a
wheel commanded by a little roller, which itself is mounted upon a
supporting shaft communicating the motive force. Above this wheel
are fixed, by means of bolts, brackets having each a sort of inclined
plane which forms a cam. The cams and the levers correspond, being
arranged around the same circumference. These cams, four or more in
number, successively lift the levers, and then leaving them the latter
fall of their own weight and strike upon the rods. The shock rever-
berating over the wire gauzes the material cannot possibly remain upon
them, and the sifting is effected in the most thorough manner. The
wheel carries at its lower part a rack, leading the manufactured mer-
chandize, i.c., the flour, into lateral collectors. Each pair of stones
enveloped by its hooping preserves the ordinary appearance, and thus
hides all the interior movement..
According to the third part of my improvements at the same time
that the workman or miller arranges the stone, he places the oblique
rays of wood, plaster, lubricated metal, or other material regularly upon
all the perimeter of the stone. Any suitable calibre or pattern can
guide him in this operation, which ought to be effected as regularly as
possible.
When all the stones and rays are placed the millstone is fixed and
rendered solid by the hoops in the ordinary manner, and it is left to
cement firmly during the necessary time. When the stone is well
dried the rays are removed by means of a screw bit, a graver's tool, or
other convenient instrument, the spaces occupied by the rays remain

page_text: If the temporary partitions or rays are of metal, previously lubricated
and slightly cone or taper shaped, it is easy to remove them from the
millstone after its formation and fixing. The stones remain intact in
their cemented assemblage, the spaces are empty, and the boxes or
frames with metallic cloth or wire gauze may be placed therein to effect
the direct sifting of the flour. This modified arrangement is a very
economical one, since it enables the employment of the cast-iron plat-
forms and partitions to be dispensed with, and besides it has the effect
of obtaining a very regular combination as regards the oblique rays,
which compensates for the effect of the centrifugal force either by the
direct action or the reaction.
Instead of arranging the forms of wood or other material as oblique
rays I can dispose them regularly, following alternate circular
segments. In this case I can give to these blanks, in the form of
segments, whatever length may be the most desirable with regard to the
sifting required to be effected.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Jules Aubin in the Great Seal Patent Office on the
23rd December 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JULES
AUBIN, of Rue de Rivoli, 146, at Paris, Miller, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-third day of June, in the
year of our Lord One thousand eight hundred and seventy-four, in
the thirty-eighth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Jules Aubin, Her special
licence that I, the said Jules Aubin, my executors, administrators, and
assigns, or such others as I, the said Jules Aubin, 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,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN MILLSTONES FOR GRINDING CORN AND OTHER SUBSTANCES," upon the con-

page_text: dition (amongst others) that I, the said Jules Aubin, my executors
or administrators, by an instrument in writing under my, or their, or
one of their hands and seals, 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 filed 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 Jules Aubin, do hereby declare 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 thereof, that is to say:-
My Invention has for its object improvements in the system of mill-
stones which I have specified in my preceding Patent dated the 16th
day of November 1864, No. 2862, and which consists in the arrange-
ment of a cast-iron trough or platform surmounted by tubes with a
filling of grinding stones between the tubes in order thus to constitute the
body of the millstone. The tubes are inclined in relation to the direction
of the platform, and upon the upper part of each a movable box pro-
vided with a metallic cloth or wire gauze or other means of sifting is
placed. This millstone comprises then a metallic platform serving as a
seat for the grinder, subdivided into several compartments all alike and'
symmetrically directed in order to constitute as. many orifices for
ventilation and sifting for the passage of the flour.
The first part of my present improvements relates to a new arrange.
ment for the purpose of giving to the metallic cloths or wire gauze a
vibratory movement, free from deterioration and excessive wear and
tear, capable of ready application to existing millstones, while preserving
to each pair of the latter their ordinary appearance..
The second part of my improvements consists in adding beneath the
hopper through, which the bran falls, as well as beneath the conduit
through which the flour proceeds, a system of sifting intended to extract
the little particles or rednesses which may have got through the metal
compartments. This sifter which is of metallic, textile, or animal cloth
of a finer texture than that of the boxes, serves at the same time to
refine the flour. I also arrange an independent aspirator in order to
prevent the grinding from cumbering the stone and choking the return

page_text: sifting motion between the organ of action d and the metallic boxes.
This organ d is a sort of lever with a free joint upon a support e fixed
beneath the fixed stone m. Each box has its lever arranged so as to be
able to strike upon the corresponding vertical rod d. Lower down there
moves freely upon the axis f a wheel g commanded by a little roller
(Figure 9), which itself is mounted upon a supporting shaft communi-
cating the motive force. Above this wheel 9 are fixed, by means of
bolts, brackets i, having each a sort of inclined planej which forms a
cam. The cams and the levers d correspond, being arranged around
the same circumference. These cams, four or more in number, succes-
sively lift the levers, and then leaving them the latter fall of their own
weight and strike upon the rods d¹; the shock reverberating over the
wire gauzes the material cannot possibly remain upon them, and the.
sifting is effected in the most thorough manner. The wheel 9 carries at
its lower part a rack k, leading the manufactured product, that is, the
flour, into lateral collectors. Each pair of stones enveloped by its
hooping preserves the ordinary appearance, and thus hides all the
interior movement.
In Figure 10 I have shown a plan of a millstone arranged according
to the third part of my improvements; the left half in this Figure
shows the millstone in course of construction, the right represents it
as completed. Figure 11 is a section made following the line A, B, in
Figure 10; and Figure 12 is another section following another line C, D,
in Figure 10.
At the same time that the workman or miller arranges the stones a, a,
he places the oblique rays b, b, of wood, plaster, lubricated metal, or
other material regularly upon all the perimeter of the stone. Any
suitable calibre or pattern can guide him in this operation, which ought
to be effected as regularly as possible.
When all the stones and rays are placed the millstone is fixed and
rendered solid by the hoops_c, c, in the ordinary manner, and it is left.
to cement firmly during the necessary time. When the millstone is
well dried the rays 6 are removed by means of a screw bit, a graver's
tool, or other convenient instrument; the spaces occupied by the rays
remain then empty and the millstone is in the state shown in the right
T
10

page_text: If the temporary partitions & are of metal, previously lubricated and
slightly cone or taper shaped, it is easy to remove them from the mill-
stone after its formation and fixing. The stones a, a, remain intact in
their cemented assemblage, the spaces d, d, are empty, and the boxes or
frames with metallic cloth or wire gauze may be placed therein to
effect the direct sifting of the flour. This modified arrangement is a
very economical one, since it enables the employment of the cast-iron
platforms and partitions to be dispensed with, and besides it has the
effect of obtaining a very regular combination as regards the oblique
rays, which compensates for the effect of the centrifugal force either by
the direct action or the reaction.
Instead of arranging the forms of wood or other material as oblique
rays I can dispose them regularly, following alternate circular segments,
as shown in the diagram in Figure 13. In this case I can give to these
blanks, in the form of segments, whatever length may be the most
desirable with regard to the sifting required to be effected.
I do not confine myself to the exact method of arranging the
parts as shown in the Drawings, because they can be modified under
certain circumstances to suit the mill in which the Invention is to be
fitted.
Having described the nature of my said Invention and the manner in
which the same shall be carried into practice, I declare that I
claim as my improvements in millstones for grinding corn and other
substances,
Firstly. The arrangement of mechanism for giving to the sifters or
metallic compartments a vibratory motion, as hercin-before described
and as shown in the accompanying Drawings.
Secondly. The addition beneath the hopper through which the bran
falls, as well as beneath the conduit through which the flour proceeds,
of a system of sifting intended to extract the impurities which may
have escaped the vibrating compartments, and the combination of an
independent aspirator in order to prevent the flour from choking
the stone, as herein-before described and as shown in the accompanying
Drawings.
T:
ங்,
tion
of the millstone in nartitions by means of

page_text: ubstances, between which the grinding stones are keyed, as herein-
before described and shown in the accompanying Drawings, more par-
icularly in Figures 10, 11, 12, and 13, thereof.
In witness whereof, I, the said Jules Aubin, have hereunto set my
hand and seal, this Sixteenth day of December, One thousand
eight hundred and seventy-four.
Witness,
CHARLES ARMENGAUD,
Civil Engineer,
23, Boulevard de Strasbourg,
à Paris.
JULES AUBIN. (L.S.)