AN IMPROVED MILL FOR GRINDING CEREALS AND BREAKING OR PULVERIZING ORES, BARK AND OTHER MATERIALS
Year: 1884

page_text: I HERBERT JOHN ELADDAN, of the firm of Herbert and Company, Patent Agents,
of 67, Strand, in the City of Westminster, Civil Engineer, do hereby declare
the nature of said Invention for AN IMPROVED MILL FOR GRINDING CEREALS
AND BREAKING OR PULVERIZING ORES, BARK AND OTHER MATERIALS, to bo as
follows:-
This invention relates to machinery for grinding or disintegrating cereals, orcs,
bark and other materials by means of toothed discs.
The improved disc chiefly comprises a vertical shaft carrying at the top a
horizontal disc provided on its upper face with several concentric rows of teeth,
and a fixed disc placed parallel and opposite to the revolving disc and provided on
its lower face with concentric rows of discs at such a distance from the centre of
the disc, that each row is situated between two rows of the lower or movable disc.
Each disc has on its toothed faco a number of concentric grooves alternating with
the rows of teeth.
The discs are preferably made of steel and the teeth fixed to them by rivetting.
The upper disc is secured to a platform or table (situated under the lower disc)
by several bolts and nuts which allow the distance between the discs to be adjusted
as desired.
The fixed disc has in the centre a circular opening for the reception of the raw
material. The vertical shaft runs in a step bearing and is guided near the top by
a lateral bearing secured to the frame which also supports the platform and
protects the driving pulley as well as the step bearing from dust. Besides the
central stand, which has the shape of a hollow column, there are a number of stays.
for supporting the table.
The discs are surrounded by a copper casing which receives the ground material
and has a lateral opening for discharging the same.

page_text: 26
1, HERBERT JOHN HADDAN, of the firm of Herbert & Company, Patent Agents,
of 67, Strand, in the city of Westminster, Civil Engineer, do hereby declare the
nature of said Invention for AN IMPROVED MILL FOR GRINDING CEREALS AND
BREAKING OR PULVERISING ORES, BARK, AND OTHER MATERIALS," and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :—
This invention relates to machinery for grinding or disintegrating cereals, ores,
bark and other materials by means of toothed disks.
In describing the invention reference will bo made to the annexed drawings
representing a machine, embodying the invention and in which Fig. 1 is a vertical 1
section along line C-D of Fig. 2; Fig. 2 is a horizontal section along A-B of
Fig. 1 Fig. 3 a plan of the lower disk b, and Fig. 4a plan of the upper disk a.
The apparatus comprises:
1. A fixed circular plate a made of steel and provided with concentric grooves
from 2 to 3 millimetres deep. On the projections formed by these grooves are 1
rivetted the steel pins p. That part of the pins which is inserted into the plate, is
conical so that the pins held in one direction by the rivetted joint and in the other
direction by their conical shape, are rigidly fixed to the disc.
The fixed disk a has 4 holes 71 s t u¹ and rests on four screw nuts, each of
which is screwed to a bolt passing through one of the said holes. This arrangement
permits to raise or lower the disk a as desired for adjusting its distance from the
disk b.
In the centre of the fixed disk a there is a circular aperture a' serving to receive
a funnel or hopper for introducing the material into the interior of the machine.
2. A second circular plate b made of steel but movable around the axis M N. 1
This disk is provided with grooves, like those of the plate a and carries pins of the
same shape and arranged in the same manner, but the grooves and pins of the
disk bare arranged so as to divide the distance between the rows of pins of
the disk a, leaving about 6 millimetres clearance between the rows of one disk and
the nearest rows of the other disk.
3. A steel shaft c on which the lower plate b is made fast by means of two
sercw's.
The lower end of the shaft carries a pivot of hardened steeel running in a step
bearing of phosphor bronze. The upper part of this bearing forms an oil cup
communicating through small channels with the pivot so that this part of the shaft
is constantly immersed in the lubricant.
In mills with disks of large diameter, the bottom of the bearing is provided
with steel lenses or foot plate on which turns the pivot.
The shaft c is held at its uper part by a bearing a made of phosphor bronze.
This bearing is provided with a grooved collar, the groove of which receives oil
from the automatic lubricator f.
On the shaft c is mounted a pulley g provided with two flanges and held by
means of screws p¹ and 7. This pulley receives motion from a strap and
transmits it through the shaft c to the disk b.
4. A cast iron disk or platforın h. On this
hold the disk a.
disk are secured the 4 bolts which
The disk is secured to the machine frame by means of 4 bolts i fig. 1.
The outside of the frame k forms a surface of revolution produced by the
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OTO the avis MN

page_text: The frame is of cast iron and bored out for receiving the upper bearing e and
the step bearing d, which are prevented from turning in the frame, by means of
hooks.
The inside of the frame is hollow to receive the pulley g, while an aperture x y
permits the passage of the belt and the mounting of the pulley.
The frame is supported by a base plate and secured on the same by means of
the bolts m.
In order to render the whole more solid, I provide the machine with auxiliary
supports or stays n which directly connect the base plate with the cast iron plato h
and thus prevent or reduce the vibration of the latter.
The base plate is secured to a suitable foundation.
In order to collect the ground material and to prevent any loss of the same the
disk a is surrounded with a copper mantle o which fits accurately to its circum-
ference and is secured to the disk by iron cramps or bolts. This mantle has an
opening of which serves to remove the ground material.
The speed of the machine varies from 1500 to 5000 revolutions per minute
according to the diameter of the disks, and the material to be ground or
disintegrated.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is :
1. In a grinding or disintegrating mill the combination of a toothed stationary
disk with a toothed revolving disk, constructed and arranged substantially as
described.
2. In a grinding or disintegrating mill the combination of toothed disk a with
toothed disk b, platform h, shaft c with pulley g, and stand with bearings d, e,
the whole being constructed and arranged to operate substantially as described.
3. The combination of disk a, with disk b, shaft c with pulley g, platform h,
envelope o, stand k with bearings d, e and lubricating appliance for the same, base
plate and stays n, substantially as described and for the purposes specified.
Dated this 11th day of October 1984