Year: 1888

page_text: Date of Application, 21st July, 1888
Specification Accepted, 19th Oct., 1888
We, FRIEDRICH KOERWIN, of Lintgen, Mechanician, and VICTOR CLEMENT of
Luxemburg, Merchant, both in the Graud-Duchy of Luxemburg, 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 improved mill which forms the subject of this invention is represented in the
accompanying drawing. It comprises one pair of discs for grinding and another pair
of discs for rough-grinding grain (M and N, Figure 2).
The upper disc of either pair (A, A' or A¹¹, Figure 4) is stationary and the lower
is rotary (Figure 5).
In a cast-iron casing E enclosing the discs (Figure 4) are arranged two rings,
that is to say, an inner ring (formed integral with, or fixed to the said dises and
provided with grinding edges exclusively designed for breaking the grain and an
outer ring D of wood, into which knives of about a quarter of a millimetre in thick-
ness are let either so as to effect shearing cuts (A and A¹, Figure 4) for ordinary
grinding or in a straight line from the centre (A" Figure 4) for fine-grinding.
The discs can be made of any size according to requirements.
The knives are placed at a distance from each other of about three inillimetres at
the periphery, and about one and a half millimetres in the interior, and protrude
about half a millimetre above the wood.
The protruding portion of the knives is rounded off in the pair of discs for grinding,
whereas in the pair of discs for rough grinding it is made square and sharp and
requires to be resharpened from time to time.
The upper stationary discs are secured upon an iron ring or so-called case E
(Figure 5), and the lower discs are placed upon a vertical shaft or mill-spindle F
(Figures 2 and 5), their velocity being about a thousand revolutions per minute.
This improved pair of discs for grinding, made for example twenty-two centimetres
in diameter, produces, when operated by hand, twenty-five pounds of flour per hour.
Wheat is completely ground by feeding it into the hopper once, rye by feeding it into
the said hopper twice.
The quality of the flour and bran is superior to that obtained by means of the mills
heretofore used.

page_text: Any grain can be ground either in a dry or wet condition.
The pair of discs for rough-grinding also excels the systems heretofore used, as not
only the finest coarse-ground grain is obtained without the slightest heating, but if
the rich bran of the coarse-ground grain is to be obtained together with the flour, it
can be so cut that it also passes through the silk to the flour without losing in quality.
H and H' (Figures 1 and 2) are screws for adjusting the discs.
The squeezing rollers K and K' (Figure 3) are not absolutely necessary, as the
grinding can be effected without them by means of the improved discs provided with
Knives as described.
This mill is set in motion either by hand through the medium of a crank O fixed to
the toothed wheel L (Figure 2); or by any suitable motive power through the
medium of the pulley P.
The grain falls from the hopper R (Figures 1 and 3) upon the sieve S, thence
between the two squeezing rollers K and K' upon the shaking sieve T which by
means of a movable slat arranged at U, conducts the grain at pleasure either to the
pair of grinding discs M through the opening V, or to the pair of rough-grinding
discs N through the opening X. The ground material passes from the pair of
grinding discs M into the cylinder or flour sieve placed in the case Y.
The flour remains in the case Y, whereas the coarse-ground grain and bran fall
from the cylinder upon the sieve Z and thence into the fore-case W.
With the pair of rough-grinding discs the ground material can at will be conducted
into the cylinder or through an outer opening directly into a sack.
The improved grinding mill above described is easily portable and is very
advantageous for domestic use.
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 :-
First. The discs A, A' and A" having grinding edges and knives let into wood
either so as to produce a shearing action as in A and A¹, or in a straight line from
the centre as in A".
Second. The grinding mill adapted to be driven either by hand or by machinery,
and having a hopper R, sieve S, squeezing rollers K and K', sieve T, cylinder and
sieve Z and a casing W substantially as and for the purpose described.
Dated this 21st day of July 1888.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicants.