A New or Improved Machine for Grinding Cast Steel Balls.
Year: 1897

page_text: Date of Application, 15th July 1897-Accepted, 4 Dec. 1887
COMPLETE SPECIFICATION.
A New or Improved Machine for Grinding Cast Steel Balls.
We, CARL ROBERT KAPPLER or Gochsheim near Schweinfurt, Master Builder, and
KARL FRIEDRICH SCHUNK of 9½, Anden Schanzen, Schweinfurt a/M, 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:
The present invention relates to a machine for grinding cast steel balls by means
of which cast steel balls of all sizes can be produced with complete utilisation of the
grinding devices.
The accompanying drawings illustrate in a longitudinal section and by way of
example this new cast steel ball grinding machine.
A, is the bed of the machine provided with bearings for supporting the revolving
shafts. Upon the plate a of the machine bed A is arranged a perforated casing b
which carries the stationary disc c. The vertical shaft e which can be accurately
adjusted in position as regards its height by means of a screw d is supported in the
bed A of the machine, and carries the removable cover f, in which is fixed the emery
disc g. This cover fis fixed in a removable manner by means of the nut h, upon the
conical part i of the shaft e, The emery disc 9 is fixed in the cover by means of a
composition which does not attack the iron parts. A belt pulley imparts a rapid
rotary motion to the cover and to the emery disc. The third grinding device is
constituted by the cone m which is fixed upon a sleeve n that is provided with a
supporting disc o. This sleeve n is capable of rotating with the hollow shaft p which
is itself capable of rotating about the shaft e, but the sleeve n is also arranged to be
P there is
capable of movement in the longitudinal direction. Upon the hollow shaft
mounted the belt pulley q which imparts to the hollow shaft p and consequently also
to the cone m a velocity which is four times less than that of the cover f and emery
disc g. Further the cone m rotates in the reverse direction to that of the emery disc g.
A ring capable of rotating about the sleeve n is provided with pins 8 with which
engages the slotted end of a levert which is provided with a movable weight u, and
presses the cone m upwards. The guard plates v and wand also the annular shoulder x
prevent ground particles, emery dust and the like from getting in between the rotating
parts. The gutter y collects the ground balls and conveys them to the collecting
gutter z whence they pass to a sorting machine.
The machine operates as follows:-
After removal of the cover f, a number of balls are placed in the intermediate space
between the stationary grinding disc c and the upper end of the cone m, and the
cover f together with the emery disc g is fastened again on the shaft e. The distance
of the emery disc g from the stationary disc c is regulated by means of the set screw d.
By means of the adjustable weight u the sleeve n with the cone m is adjusted
according to the amount of wear of the stationary disc c and of the cone m, and also
serves at the same time for regulating the size of the cast steel balls to be made.
When the balls are completely ground, then by raising the weight u the sleeve n with
the cone m is lowered and the balls run along the cone down into the channel y
whence they are led to the collecting channel 2. The belt pulley may be driven if
desired by crossed belts or any other manner, but the emery disc g and the cone m

page_text: must rotate in opposite directions. As the cone m and the disc c become worn, the
weight u will sink and will always produce the same grinding space for the balls. In
this manner a complete utilisation of all the grinding parts is ensured. It is also to
be understood that the cone might also be made in another way, namely so that the
wide side would be at top and the narrow side at the bottom. Then the emery disc
would have to be arranged accordingly.
The essential feature of the invention consists in that the grinding process takes
place between three parts of which one is a revolving cone and the other two are
respectively a stationary disc and a rotating grinding disc arranged in such a manner
that by the wear of the same the cone adjusts itself automatically so that always the
same grinding space is present.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
(1) A machine for grinding cast steel balls, characterised by a stationary disc and
a rotating grinding disc and a cone, which three parts are arranged relatively to each
other in such a manner that by the wear of the same they will always form the same
grinding space for the balls to be ground.
(2) A machine for grinding cast steel balls according to Claim 1, characterised by
a stationary disc c, a rotating disc g, and a cone m, rotating in the opposite direction,
which parts constitute the grinding space, the arrangement being such that the
cone m is capable of movement on the axis of rotation in the longitudinal direction
by means of a counter weight u and of a levert, with the object of maintaining
always the same desired grinding space according to the wear of the stationary disc c
and of the cone m.
(3) A machine for grinding cast steel balls constructed arranged and adapted to
operate substantially as hereinbefore described and shown.
Dated this 15th 1
CTL 1037
ROBERT E. PHILLIPS Assoc. M. Inst. C.E., M. I. Mech. E.
Consulting Engineer & Patent Agent
70, Chancery Lane, London, W.C. Associate Agent.