IMPROVEMENTS IN GRINDING MILLS
Year: 1880

page_text: LETTERS PATENT to Edward Willoughby Anderson, of the City of Washington,
District of Columbia, United States of North America, Patent Solicitor and
Attorney at Law, for an Invention of "IMPROVEMENTS IN GRINDING MILLS."
A communication by James Jones, of Louisville, in the County of Jefferson,
State of Kentucky, one of the aforesaid United States of North America.
COMPLETE SPECIFICATION filed by the said Edward Willoughby Anderson
at the Office of the Commissioners of Patents on the 14th August 1880.
EDWARD WILLOUGHBY ANDERSON, of the City of Washington, District of
Columbia, United States of North America, Patent Solicitor and Attorney at Law.
"IMPROVEMENTS IN GRINDING MILLS." A communication from James Jones, of
Louisville, in the County of Jefferson, and State of Kentucky, one of the aforesaid
United States of North America.
This Invention has relation to improvements in grinding mills, and the nature of
the Invention consists in certain novel combinations of parts, whereby the smooth
cylindrical running stone may be adjusted to the concave bed stone with extreme
nicety. It also consists in certain other improvements, whereby the products of
the grinding mills are greatly improved, as will be hereinafter more fully set
forth.
In the annexed Drawings Figure 1 is a representation of an end view of my
improved grinding mill; Figure 2 is a longitudinal vertical section of the same, and
Figure 3 is a plan view of the said mill.
In these Figures of Drawings like letters of reference are employed to indicate
corresponding parts wherever such may occur; A, designates the bed stone,
and B, a strong upright frame, the side pieces of which are connected together at
top by an arched brace C. The side pieces J are usually of wrought or cast iron,
and their upper portions are of the form of an inverted letter U, whereof the arms
may be suitably braced together if desired. The bed stone is cylindrically concave,
the curve being of about one hundred and twenty degrees, and it is made of French
burr or other stone. The grinding surface of this stone is smooth and highly
polished, and it is absolutely without dress. Projecting from the ends of this stone
are the horizontal extensions c, or they may project from the casing B' thereof,
which extensions rest against the undersides of the ledges b, and are supported
Duine G21

page_text: therefrom by means of screws 8 extending through slots 8¹ in said ledges into the
extensions aforesaid. The ledges b have depending flanges b', through which
pass the adjusting screw 8", bearing against the edge of the said extensions, by
means of which the bed stone or casing is adjusted front or rear.
The adjustment of the bed stone to render it level is had by means of the
screws 8 passing from above through the ledges into or onto the extensions
aforesaid; c, designates bearing boxes arranged after the manner of a sash in the
space between the arms & of the U shaped portions of the frame.
The end walls of these boxes fit smoothly up against the inner faces of the said
arms, and are provided with a groove v, in which is received a tongue or rib t on
the said arms d. They are thus vertically adjustable in absolutely parallel planes.
Rigidly secured to these boxes, in any suitable manner, are the strong metallic
screw threaded rods e, that pass up through the ends of an independent arch D
and through the top of the frame, by means of perforations formed therein of
sufficient size to allow the said rods free end wise movement. Bearing on the top
of the frame and applied upon the threaded ends of the rods e are hand wheels f
and above and below the independent arch D on the rods e are applied the nuts i, i,
respectively, the object being to render the boxes c¹ vertically adjustable and to
connect the independent arch D adjustably to said rods. At the highest point of
the arch brace G is formed a vertical screw seat g, in which a screw S works. This
screw is provided with an enlarged head, and is passed from below through
the arches D, C. It is provided on its end above the arch brace with a hand
wheel h.
The running stone G is a perfect cylinder, and is made of French burr or other
stone. Its periphery is nicely polished and dressed, and it fits snugly into the
concavity of the bed stone, the grinding surfaces of the two stones being in contact
at all points embraced by the said bed stone. The running stone is journaled in
the boxes c¹ and derives motion through an endless belt G' from a main shaft G",
and pulleys p,p', respectively on said shaft and the journal of the said running
stone. The running and bed stones are enclosed within a casing B₁, the upper
portion of which is removable, as indicated at H. Grain is fed to the stones by
means of a hopper H", having at its educt or throat a feed roller I, which derives
motion from the main shaft Q through the medium of an endless belt I, and the
pulleys j, j', respectively on the journal of the feed roller and on said shaft. Inside
of the hopper and above said roller, but noar thereto, is a magnet o extending its
length, which captures and holds any particles of metal in the grain and prevents
them from passing between the stones. The magnet is four sided, as shown; at
the second reduction of the "chop" this magnet likewise collects any metallic
particles that may have passed through the stones.
In grinding the bed stone is adjusted perfectly level, that is, with its longitudinal
axis as nearly horizontal as can be. The running stone is lowered upon the bed
stone by means of the rods e and hand wheels funtil it rests fairly therein. The
lifting screw is then raised by turning hand wheel h, thus raising the running stone
until the desired adjustment is attained, and the hand wheels frun down until
they bear upon the frame and prevent the said running stone from tipping into
contact with the bed stone.
The nuts i, i, above and below the lifting arch hold the said arch in a fixed
position relative to the rods e, and compel it to move vertically in parallel planes.
The ground grain is discharged from the stones through the chute K, and falls upon
a horizontal screen L arranged at the upper edge of a shoe or box L' having an
inclined bottom k. This shoe is supported at one end by a transverse brace 7 of
the frame, or I may use a roller in lieu thereof, and at the other end is provided
with projecting arms l' terminating in rings m, that engage the eccentrics n on
the main shaft, which when the said shaft is rotated impart to the shoe a rapid
rising and falling and endwise movement, the jarring thus produced keeping the
screen from clogging up and materially aiding in the separation of the bran from
the flour.

page_text: This falls into the shoe, and is discharged through a spout n' at the lower end of
the inclined bottom & into a receptacle N. Opening into this receptacle close up
to the spout n is a trunk O of considerable width, in which the falling flour spreads
for the purpose of separating therefrom the light impurities and dust; this is
accomplished by means of an exhaust fan P on the end of the main shaft, which is
enclosed in a case Q, having communication with the trunk by means of a pipe R.
Between the lifting arch and the arch brace of the frame is a spring S¹ arranged
on screw S, and engaged at its ends in recesses of the arch and brace respectively.
This spring is compressed when the lifting screw is raised, and react when the
stone is lowered, thus pressing it towards the bed stone and giving a yielding to
the runner.
Having now described my Invention, and the manner in which the same may
be carried into practical effect, I would have it understood that I do not limit
myself to the exact details in the construction, as shown and described, as these
may be varied without departing from the peculiar nature of my said Invention,
but what I do claim is,-
1st. The method and means bereinbefore described for adjusting the bed stone
of a grinding mill, as specified.
2nd. The method and means for adjusting the runner of a grinding mill,
substantially as hereinbefore set forth.
3rd. The method and means for separating particles of metal from the grain or
chop fed to a grinding mill, substantially as herein before described.
4th. The method and means, substantially as herein before described and shown
in the accompanying Drawings for separating the bran and other light particles
from the ground product.
5th. The construction of grinding mill, substantially as hereinbefore described
and shown in the accompanying Sheet of Drawings.
In witness whereof, I, the said Edward Willoughby Anderson, have hereunto
set my hand and seal, this 14th day of August, in the year of our Lord
One thousand eight hundred and eighty.
חתזוזת
----
AKRAAS
EDWARD
זזז
LOUGHBY ANDERSON. (L.S.)