IMPROVEMENTS IN MACHINES FOR BREAKING OR REDUCING GRAIN
Year: 1883

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LETTERS PATENT to Carl Pieper, Civil-Engineer and Patent Agent, resident
at 109-110 Gaeisenaustrasse Berlin S.W. Prussia for an Invention of
"IMPROVEMENTS IN MACHINES FOR BREAKING OR REDUCING GRAIN A
communication to him from August Christian Nagel, Reinhold Hermann
Kaemp and Adolph Linnenbrügge, all three of the firm of Nagel and Kaemp
at Hamburg, German Empire.
(Void by reason of the Patentee having neglected to file a Specification in
pursuance of the conditions of the Letters Patent.)
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office of
the Commissioners of Patents on the 12th February 1883.
CARL PIEPER, Civil Engineer and Patent Agent, residing at 109/110 Gneisenau-
strasse, Berlin SW. Prussia IMPROVEMENTS IN MACHINES FOR BREAKING OR
REDUCING GRAIN, a communication to me from August Christian Nagel, Reinhold
Hermann Kaemp, and Adolph Linnenbrügge, all three of the firm of Nagel &
Kaemp at Hamburg, German Empire,
The subject matter of this invention consists in improvements in machines or
mills on which grain is broken or reduced between two disks having annular
milling surfaces.
The improved machine consists either of one rotating milling-disk cooperating with
a single fixed disk, or of two rotating disks placed back to back with an intervening
space on the same shaft, and having a fixed disk opposite to each of them.
Inside of the annular milling-surfaces there is a space between the cooperating
disks. Within this space the rotating disk or disks are provided with ribs or
ledges so arranged that the grain introduced into the machine by a feed channel
passing through the fixed disk, will be thrown or projected by them towards the
milling-surfaces. When the disks are vertical, the fixed disks are provided upon
the lower part of their inside face with a ledge forming an arc of a circle and
arranged close to the path of the ends of the throwing ledges. This circular

page_text: ledge serves to prevent grain from dropping between the disks without being acted
upon by the throwing ledges.
The rotating disk or disks project over the outer edge of the milling-surfaces,
and on both sides of this projecting part they are provided with fan-blades, the
series of blades on one side drawing air together with the reduced grain from
between the rotating and the fixed disks, while the other series of blades draws air
from the back of the rotating disk. The air drawn in by both series of blades, is
forced along with the ground material into a channel surrounding the rotating
disk, and thence into a conduit leading to the sifting or purifying machines, upon
which the material is to be submitted to further treatment. The air-current thus
serves for cooling the machine and the material, and besides as conveying medium
for the latter instead of the ordinary creepers and elevators.
Each fixed disk is pressed towards the corresponding rotating disk by a spring
or a weight, but it is maintained at the proper distance from the rotating disk by
an adjusting-ring screwed on its periphery and bearing against the machine frame.
This ring in being turned one way or the other, will cause the distance between
the milling surfaces to be increased or diminished, as may be desired.
The milling-surfaces are, by preference, formed on separate rings, secured to the
disks by other rings forming-annular nuts, which are screwed on an offset of the
disks provided with screw-threads, while they overlap with their outside edge the
inner edge of the rings bearing the milling surfaces. These surfaces may be
provided with cutting edges, furrows, teeth or other projections.