Year: 1897

page_text: Date of Application, 23rd June; 1897
Complete Specification Left, 22nd Mar., 1898-Accepted, 7th May, 1898
I, THEODOR FRITSCH, of 10, Gerichtsweg, Leipzig, in the German Empire, Milling
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to a grinding mechanism by means of which stone fruits
and other materials can be reduced under a minimum of pressure, without caus-
ing the working pressure to be carried over upon the shaft bearing. The apparatus
consists essentially of a plate mill with conical grinding rings forming an adjust-
able grinding surface, in which the material to be ground first passes a dish shaped
cavity for the purpose of effecting a more uniform distribution and the separation
of any foreign bodies. It then spreads itself over the surface of a large distributing
plate, is thrown by the centrifugal force against the periphery of the cover and is
thereby caused to settle in a stationary layer upon the annular upper surface of
the outer grinding ring which is sloped off to the outside, in order finally to pass
between the grinding surfaces in a direction opposite to that of the centrifugal
force.
The working parts of my improved mill consist essentially of two slightly coned
grinding rings fitting the one in the other, the contact surfaces of which form an
approximately cylindrical grinding track. One of these grinding rings is fixed
upon the periphery of a plate shaped disc, which disc serves at the same time as
a distributing disc and delivers the substance to be ground entering at the middle
through a suitable pipe in uniform division in the manner of a centrifugal dis-
tributor. The vertical shaft of the aforesaid disc or distributor is supported in
bearings and driven by a pulley or other convenient method. The outer grinding
ring is fastened to the surrounding cover and may be either stationary or also
capable of revolution. The conical form of the grinding rings enables an adjust-
ment of the width between the grinders by means of the raising or lowering of
the distributing disc with the inner grinding ring which is conveniently effected
by means of a hand wheel and suitable gearing.
In order to prevent the entrance of injurious substances between the grinding
rings the distributor has at its middle a dish shaped cavity at the bottom of which
the delivery pipe terminates. The substances to be ground must consequently
be raised over the edge of the plate by means of the centrifugal force, whereas
stones and metal pieces in consequence of their greater weight remain upon the
bottom of the dish and can be removed from time to time. In order to keep back
any harder portions which may nevertheless pass over the distributor, the material
to be ground is first drawn from the distributor against the surrounding cover
where it settles upon the edge of the outer grinding ring in a regular layer and
then falls from this between the grinding surfaces or is drawn in by the furrows of
the grinding ring arranged for this purpose. The heavier portions will be thrown
with greater force to the circumference and remain resting in this layer. This
arrangement also prevents an excess of material being delivered to the grinding
surface. If the delivery is too quick the material piles itself up upon the surface

page_text: This
of the distributor which is visible through a glazed opening in the cover.
method of delivery renders the application of a feeding roller or of a rocking slioot
and of a stone catcher unnecessary.
In order to effect the cooling of the grinding surfaces the inner grinding ring
is provided with several slotted openings which admit of the entrance of air. In
order to increase the current of air admitted the distributor is provided under-
neath with wide rings which act as ventilator flaps and force the air aspirated'
from below between the grinding surfaces. The edge of the distributor is moreover
considerably thickened so as to act as a flywheel. The material for the grinding
rings is various, it may be cast iron, steel, stone, porcelain, hard glass and the
like.
The grinding surfaces are suitably provided with ridges and furrows or
otherwise suitably roughened!
are
Improved Grinding Mil.
I, THEODOR FRITSCH, of 10,, Gerichtsweg, Leipzig, in the German Empire, Milling
Engineer, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
My invention relates to a grinding mechanism by means of which grains kernels
and other materials can be ground with a minimum expenditure of force and
without causing a proportion of the energy to be expended in the shaft bearing.
The apparatus consists essentially of a plate mill with conical grinding rings
forming an adjustable grinding surface, in which the material to be ground first
passes a dish shaped cavity for the purpose of effecting a more uniform distribu-
tion and the separation of any foreign bodies. It then spreads itself over the
surface of a large distributing plate, is thrown by the centrifugal force against
the periphery of the cover and is thereby caused to settle in a stationary layer
upon the annular upper surface of the outer grinding ring which is sloped off to
the outside, in order finally to pass between the grinding surfaces in a direction
opposite to that of the centrifugal force.
The accompanying drawing illustrates the invention in elevation and partial
section.
The, working parts of my improved mill consist essentially of two slightly
coned grinding rings A and B-fitting the one in the other, the contact surfaces
of which form an approximately cylindrical grinding track. One grinding ring A
is fixed upon the periphery of a plate shaped disc C which disc serves at the same
time as a distributing disc and delivers the substance to be ground entering at
the middle through a pipe D. in uniform division in the manner of a centrifugal
distributor. The vertical shaft E of the aforesaid disc or distributor is supported
in bearings F F and driven by a pulley G or other convenient method. The
outer grinding ring B is' fastened to the surrounding cover and may be either 4
stationary as shewn or also capable of revolution. The conical form of the grind-
ing rings enables an adjustment of the width between the grinders by means of
the raising or lowering of the distributing disc with the inner grinding ring which
is conveniently affected by means of a hand wheel H. and suitable gearing.

page_text: In order to prevent the entrance of injurious substances between the grinding
rings the distributor has at its middle a dish shaped cavity K at the bottom of
which the delivery pipe D terminates. The substances to be ground must conse-
quently be raised over the edge of the plate by means of the centrifugal force,
whereas stones and metal picces in consequence of their greater weight remain upon
the bottom of the dish and can be removed from time to time. In order to keep
back any harder portions which may nevertheless pass over the distributor, the
material to be ground is first thrown from the distributor against the surrounding
cover where it settles upon the edge of the outer grinding ring in a regular layer
and then falls from this between the grinding surfaces or is drawn in by the
furrows of the grinding ring arranged for this purpose. The heavier portions
will be thrown with greater force to the circumference and remain resting in this
layer. This arrangement also prevents an excess of material being delivered to
the grinding surface. If the delivery is too quick the material piles itself up
upon the surface of the distributor which is visible through a glazed opening ₺
in the cover.
This method of delivery renders the application of a feeding roller
or of a rocking shoot and of a stone catcher unnecessary.
In order to effect the cooling of the grinding surfaces the inner grinding ring
is provided with several slotted openings ss which admit of the entrance of
air. In order to increase the current of air admitted the distributor is provided
underneath with wide ribs tt which act as ventilating flaps and force the air
aspirated from below between the grinding surfaces. The edge of the distributor
is moreover considerably thickened so as to act as a flywheel. The material for
the grinding rings is various, it may be cast iron, steel, stone, porcelain, hard glass
and the like.
The grinding surfaces are suitably provided with ridges and furrows or are
otherwise suitably roughened.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
1. A disc mill with conical grinding rings one whereof is adjustable, in which
the grist is caused to pass first through a dish shaped cavity K for the purpose
of a more uniform distribution and the separation of any foreign bodies present,
and is then distributed over the surfaces of the large distributing disc C and pro-
jected by the centrifugal force against the periphery of the cover, in consequence
whereof it lodges in a stationary layer upon the aunular upper surface which
slopes to the outside of the outer grinding ring, and finally slides in a direction
opposed to that of the centrifugal force between the grinding surfaces.
2. In a disc mill such as set forth in Claim 1, the combination of the stone
catcher K, the distributing disc C, the grinding ring A together with the flywheel
and ventilator in one piece of machinery, in which the re-inforcing ribs t t act as
ventilator wings, and supply air to the grinding surfaces through the channels s s
for the purpose of cooling the discs and the grist, substantially as described.
METH LOHO
OXUPI HOKWAKULIT HY HE VENU AHA
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester and Birmingham,
Patent Agents for the Applicant.