Improvements in Disintegrating or Grinding Machines,
Year: 1898

page_text: Date of Application, 9th Feb., 1898
Complete Specification Left, 7th Oct., 1898-Accepted, 12th Nov., 1898
Improvements in Disintegrating or Grinding Machines,
We, HERMANN PROPFE, of 8, Bernwardstrasse, and GERHARD ZARNIKO, of
10, Bahnhofsplatz, Hildesheim, in the Empire of Germany, Engineers, do hereby
declare the nature of this invention to be as follows:-
This invention relates to disintegrating or grinding machines and has for its
object a peculiar formation of the grinding discs which are provided with projecting
ridges running from the centre of the disc to the periphery. The grinding discs
themselves may be so arranged that one rotates whilst the other is stationary
or that both rotate. The discs may have a flat or dished form or be conical in
shape or the like.
The improvement consists in that the body carrying the ridges is formed
with annular grooves which become gradually shorter and lower from the centre
to the periphery.
The form may be clearly seen in Figures 1 and 2, of the accompanying draw-
ings, in vertical section, Figure 1 showing a flat dish shaped form of the grinding
surface and Figure 2 a conical one. In both figures a is a fixed cover or grinding
body, a rotating one, and the surfaces facing one another are corrugated in the
manner described.
The grinding surfaces are provided with ridges d, the arrangement and division
of which may be seen in plan in Figure 3. These ridges correspond to the
corrugated form of the grinding discs in such a way that they themselves also
show a corrugated upper surface. The height of the ridges decreases somewhat
from the centre to the periphery and the width of the interstice both between
the grinding surfaces and also between the ridges becomes somewhat less towards the
periphery.
The fineness and evenness of the ground product obtained may, in this machine,
be increased by causing the ridges d instead of extending to the periphery
as shown in Figure 2, to end somewhat before that as shown in Figure 1. The
surfaces of the grinding bodies a and b are thus extended so far that a narrow
interstice c, Figure 4, is formed which. on any insufficiently disintegrated grain
leaving the grinding space, will itself act as a narrow grinding track and assist in
completing the final disintegration. By this arrangement there also results small
counter walls e against which the particles thrown by centrifugal force strike,
whereby the disintegration is greatly facilitated, more particularly in the case of
hard materials, such for instance as coals.
1000

page_text: Disintegrating or Grinding machines.
We, HERMANN PROPFE, of 8, Bernwardstrasse, and GERHARD ZARNIKO, of
10, Bahnhofsplatz, Hildesheim, in the Empire of Germany, Engineers, 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:
-
This invention relates to disintegrating or grinding machines and has for its
object a peculiar formation of the grinding discs which are provided with projecting
ridges running from the centre of the disc to the periphery. The grinding discs
themselves may be so arranged that one rotates whilst the other is stationary
or that both rotate. The discs may have a flat or dished form or be conical in
shape or the like.
The improvement consists in that the body carrying the ridges is formed
with annular grooves which become gradually shorter and lower from the centre
to the periphery.
The form may be clearly seen in Figures 1 and 2, of the drawings accompanying
the Provisional Specification, in vertical section, Figure 1 showing a flat dish
shaped form of the grinding surface and Figure 2 a conical one. In both
figures, a is a fixed cover or grinding body, a rotating one, and the surfaces facing
one another are corrugated in the manner described.
The grinding surfaces are provided with ridges d, the arrangement and division
of which may be seen in plan in Figure 3. These ridges correspond to the
corrugated form of the grinding discs in such a way that they themselves also
show a corrugated upper surface. The height of the ridges decreases somewhat
from the centre to the periphery and the width of the interstice both between
the grinding surfaces and also between the ridges becomes somewhat less towards the
periphery.
The fineness and evenness of the ground product obtained may, in this machine,
be increased by causing the ridges d instead of extending to the periphery
as shown in Figure 2, to end somewhat before that, as shown in Figure 1. The
surfaces of the grinding bodies a and b are thus extended so far that a narrow
interstice c, Figure 4, is formed, which, on any insufficiently disintegrated grain
leaving the grinding space, will itself act as a narrow grinding track and assist in
completing the final disintegration. By this arrangement there also results small
counter walls e against which the particles thrown by centrifugal force strike,
whereby the disintegration is greatly facilitated, more particularly in the case of
hard materials such for instance as coals.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:_
1. In disintegrating or grinding machines, ridged grinding discs characterized
by the body of the discs being arranged in annular corrugations which become
gradually shorter from the centre to the periphery and in which the ridges also
show a corrugated upper surface, substantially as herein before described.
2. In disintegrating or grinding machines, ridged grinding discs such as
described having an edge projecting from the discs and terminating the ridges,
said edge forming internally a counter wall enclosing the grinding space and also

page_text: producing in conjunction with the counter disc, a narrow interstice for regulating
the discharge of the material ground and securing a final disintegration, sub-
stantially as hereinbefore set forth.
Dotod this fith dow of Octoba 1808
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicants.