Improvements in and relating to Ball Crushing Mills.
Year: 1893

page_text: Date of Application, 27th Oct., 1893-Accepted, 9th Dec., 1893
COMPLETE SPECIFICATION.
Improvements in and relating to Ball Crushing Mills.
I, EMIL FRITSCH, of Suhl, in the Empire of Germany, 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:-
This my invention relates to ball crushing mills, and the object of my invention
is to increase the efficiency of said ball crushing mills by the means hereinafter
described.
My invention consists in causing the balls which are used in crushing and the
materials which are to be crushed, to travel in a zig-zag course or path within
the drum of a ball crushing mill in order that said balls and other materials
shall travel a greater distance within said drum, and also receive greater crushing
or grinding impact than they do in ball crushing mills of ordinary construction.
In carrying out my invention I attach within, or form integral with the drum
of a ball crushing mill, a series of intermediate plates or courses.
being arranged in any convenient manner either extending from the centre of
the drum towards the shell thereof or conversely, from the shell of the drum
towards the centre; sufficient space being left between the ends of the courses
and the drum for the passage of the balls and materials under treatment from
one course to the next.
Said courses
In order that my invention may be more readily understood, reference is made
to the accompanying drawings which represent three modifications of my invention,
wherein like letters indicate corresponding parts and in which :-
Figure 1 represents one modification of my invention in which three intermediate
courses a, a, a, are shown extending radially from the shell of the drum towards the
centre, whilst three courses b, b, b, are shown arranged tangentially around the
centre of said drum.
Figure 2 represents another modification of my invention in which the courses a
and 6 are respectively arranged to extend radially from the shell and from the
centre of the drum.
Figure 3 represents a third modification of my invention in which the courses a
are arranged to extend inwardly from the shell of the drum, and at a certain angle
to the radius of said drum, whereas the courses 6 may extend (also at an angle to
the radius) either from the centre of the drum as in the previous modifications, or,
as shown, from a central drum.
In each of the modifications represented in Figures 1, 2 and 3, spaces c are left
at the end of each of the courses a and b, in order to permit the balls and other
material under treatment to pass from any one course to the next.
By means of my invention the balls which are used in crushing and the materials
under treatment are compelled to travel in a zig-zag path through the drum, and
are thrown from one side of the drum to the other, receiving thereby a greater
grinding or crushing impact than said balls &c. would have received without the
application of my invention.
From the foregoing description of my invention, I wish it to be understood
that I do not confine myself to the modifications referred to, as the number of
the courses may be either more or less or their arrangement within the drum
may be different, accordingly as any materials to be treated may require.
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 :-
A ball crushing mill having intermediate courses as at a and b, arranged in

page_text: the drum thereof and extending preferably alternately from the shell or circumference
of said drum towards the centre thereof and from the centre towards the circum-
ference, each of said courses leaving at one end sufficient space c to allow for the
passage of the balls which are used in crushing and the material under treatment
from any one course to the next, and adapted also to cause said balls and said 5
material to travel in a zig-zag path when the drum is in motion, for the purpose and
substantially in the manner hereinbefore described.
Dated this 26th day of October 1893.