Year: 1887

page_text: I JULIUS RÖMHELD, of Mayence, in the Empire of Germany, Manufacturer, do
hereby declare the nature of this invention to be as follows:-
My invention relates to a machine, or apparatus for grinding or reducing grain or
other material.
The improved grinding machine comprises a grinding stone, having its axis arranged
horizontally and entering at its lower part into a trough shaped receptacle whose
bottom surface in proximity to the grinding stone is curved to a somewhat larger
radius than the circumference of the said stone, thereby forming wedge shaped spaces
on both sides of the grinding stone between its circumferential surface and the curved
bottom of the receptacle.
Above these places are placed funnels for feeding the material to be crushed or
ground.
The axis of the grinding stone is placed eccentrically to its circumference below the
centre, and the stone is adapted to be oscillated upon this axis.
For effecting this oscillation a radial arm is attached to the stone to the outer end of
which is attached a rod connected with a crank or other mechanical device for setting
the grinding stone in oscillating motion by the to-and-fro motion of the said.
device.
:
Owing to the said oscillating motion the spaces on both sides of the grinding stone
are alternately widened and narrowed, thereby producing upon the material to be
ground and which passes into them from the funnels, a crushing effect similar to that
caused by crushing jaws which crushing action is further increased by the simultaneous.
axial displacement of the two pressing surfaces towards each other and.the consequent
triturating action.
The material thus preliminarily broken is drawn, partly by the motion of the
grinding stone and partly by its own weight, deeper and deeper into the narrowing
spaces, and is gradually reduced 'therein, being finally discharged through an opening
at the deepest point of the trough shaped bottom.

page_text: To protect the grinding surfaces from injury by the hard bodies which may pass
into the same with the material to he ground, the bearings carrying the axis of the
grinding stone are placed either in guides which are open at the top or in a fork
provided with a jointed axis so that the grinding stone can rise to any extent if pieces
of iron or other hard bodies pass into the machine.
The varying pressures which may be necessary for the different kinds of material to
be ground is obtained by increasing or decreasing the weight of the grinding stone, or
by means of spring pressure. In accordance with the coarseness or fineness to which
it is desired to grind the material, the eccentricity of the grinding stone axis, and the
curve of the grinding trough bottom are made greater or smaller relatively to each
other.
Dated this 20th day of January 1987
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.

page_text: Improvements in Apparatus for Grinding or Reducing Grain and
other Materials.
I JULIUS RÖMHELD of Mayence in the Empire of Germany Manufacturer, 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 machine or apparatus for grinding or reducing grain or
other materials.
In the accompanying drawings I have shown how my said invention may be
conveniently and advantageously carried into practice.
The improved grinding machine comprises a grinding stone a having its axis
arranged horizontally and entering at its lower part into a trough shaped receptacle >>
whose bottom surface in proximity to the grinding stone is curved to a somewhat
larger radius than the circumference of the said stone, thereby forming wedge shaped
spaces e Figure 1, on both sides of the grinding stone, between its circumferential
surface and the curved bottom of the receptacle b.
Above these spaces are placed funnels for feeding the material to be crushed or
ground. The axis of the grinding stone is placed excentrically a little to its circum-
ference below the centre, and the stone is adapted to be oscillated upon this axis.
For effecting this oscillation a radial arm d is attached to the stone to the outer end
of which is attached a rod e connected with a crank or other mechanical device, for
setting the grinding stone in oscillating motion by the to-and-fro motion of the said
device. Owing to the said oscillating motion the spaces c on both sides of the grinding
stone are alternately widened and narrowed, thereby producing upon the material to
be ground and which passes into them from the funnels, a crushing effect similar to
that caused by crushing jaws which crushing action is further increased by the
simultaneous axial displacement of the two pressing surfaces towards each other
and the consequent triturating action.
The material thus preliminarily broken is drawn, partly by the motion of the
grinding stone and partly by its own weight, deeper and deeper into the narrowing
spaces, and is gradually reduced therein, being finally discharged through an opening f
at the deepest point of the trough shaped bottom.
To protect the grinding surfaces from injury by hard bodies which may pass into
the same with the material to be ground, the bearings carrying the axis of the grinding
stone are placed either in guides which are open at the top, or, as indicated in the
drawing, in a fork g, provided with a jointed axis so that the grinding stone can rise
to any extent if pieces of iron or other hard bodies pass into the machine.
The varying pressures which may be necessary for the different kinds of material to
be ground is obtained by increasing or decreasing the weight of the grinding stone,
or by means of spring pressure as shown in the drawing. In accordance with the

page_text: coarseness or fineness to which it is desired to grind the material the excentricity of
the grinding stone axis, and the curve of the grinding trough bottom are made greater
or smaller relatively to each other.
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 :-
A machine or apparatus for grinding or reducing grain or other materials having a
vertical roller-shaped grinding stone the axis of which is supported by a pivoted
lever g, the said stone being weighted, and oscillating to and fro within a trough and
having its axis arranged more or less excentrically to its circumference according to
the coarseness or fineness to which the material is to be ground substantially as
described.