Grain Scouring Mill.
Year: 1891

page_text: Date of Application, 14th July, 1891-Accepted, 14th July, 1882
COMPLETE SPECIFICATION.
Grain Scouring Mill.
I, LEWIS BARTHOLOMEW, of Elmira, in the County of Chemung, and State of
New York, U.S.A. Millwright, 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 object of the invention is to provide a mill which will take more refuse from
the grain and leave it cleaner, by constructing a casing of staves around a conical
brush, having some different material, such as stone, adjustably contained therein,
so as to graduate the space between such material and the brush according to the
size of the grain to be operated upon.
A further object of the invention is to provide a grain scouring or cleaning mill
with a casing constructed of a series of hollow staves each filled with a slab of
stone or similar material, adjustably secured therein, and surrounding a conical
brush so as to render the partly worn portions of such brush capable of being used,
the said etaves being so arranged separate from each other and from the bottom and
top of the casing, that any one or more of the staves may be removed without
disturbing the remaining staves..
It has been found by practical experience, that it is impossible to obtain material,
of which to construct a conical brush for this purpose, of uniform quality and
durability, in consequence of which, some parts of the brush become worn before
other parts, and to prevent the perfect or good parts of the brush from doing all
the work in an inferior manner, and to render the worn or imperfect portions useful
until the entire brush is worn out or dispensed with, is a still further object of the
invention.
The invention consists in the novel arrangement and construction of parts as will
be hereinafter more fully described and claimed.
Figure 1 is a side elevation of my improved mill.
Figure 2 is a vertical section thereof, on the line x-x, Figure 1, showing the
shaft and brush in elevation.
Figure 3 is a perspective view of one of the staves, with a block of stone contained
therein, ready to be applied to the mill.
Figure 3 is a cross section thereof, taken on the line 1-2 of Figure 3.
Figure 4 is a perspective view of one of the staves.
Figure 4 is a bottom plan view of the brush, showing the grain spreaders.
Figure 5 is an enlarged vertical section of one of the staves with the stone adjusted
therein for a worn brush.
Figure 6 is a top plan view showing part of the bottom or floor of the chamber
with the sieve secured thereon, and
Figure 7 is a cross section of the casing taken on the line 3-4 Figure 1.
The same letters of reference denote the same parts throughout the several
figures of the drawings.
Although a frame of any suitable construction may be used, I prefer to employ
four uprights or standards A, secured and connected together at their top and bottom
by cross bars a. At a suitable distance from the bottom cross bars a, are located a
like set of cross bars B, and on these cross bars B is firmly secured the bottom or
bed C, of the brush or mill casing.
"The bed or bottom C, has a flange 6 extending entirely around it which rests on
the cross bars B, and a central circular aperture c which opens into a larger circular
chamber D. Over this aperture c is secured a sieve or screen E which is the only
sieve or screen employed in this mill; it has a central aperture d through which

page_text: passes the spindle or shaft e carrying the conical brush F. This shaft extends
downwardly, and has a pulley f keyed upon it, its lower end being journalled in n
bearing in the usual way. From the top of the conical brush F the shaft e extends
upwardly and has a blast fan G, secured upon it the said fan being situated in a
separate chamber or casing G' in the top of which the shaft e is also journalled.
The casing G' has at the side a branch or opening. G' for the egress of air and in
the bottom it has an inlet opening G through which the air is drawn upwards
through the casing containing the brush F.
The grain is fed into the mill through the shoot at the top from whence it
drops as indicated by the arrow in Fig. 2, on to the top of the brush where being
subjected to the action of the upward current of air it is freed from the lighter
impurities these passing off through the openings G, G. The grain is then carried
by the revolution of the brush to the sieve E, the remaining refuse material falling
through the sieve, and the clean grain is discharged through the lower shoots, as
indicated by the two arrows in Fig. 1.
The blast is produced by means of a belt from any convenient motive power,
passed round the pulley below the sieve thus revolving the fan and brush at the
same time and causing suction of air through the mill all the time it is in
operation.
1
The top of the brush F is made to taper downwardly from its center so that the
grain, which falls thereon, may more readily roll off. The bottom of the said brush
is provided with two parallel strips F secured thereon diametrically opposite each.
other, so as to spread the grain to the outside edge of the sieve and render such
sieve always clear and open.
"
H denotes the staves, being wedge shaped, and having top and bottom flanges g, h,
respectively, the side flanges which are bevelled on their outer side or edges as
particularly shown in Figures 3 and 5. These flanges with the main body of the
staves H form the receptacle for the stone L, which is concaved on its face and also
wedge shaped, and of sufficient thickness to a little more than fill the receptacle of
the stave. Or they may be put in flush with the edge of the said flanges, and be
adjusted in accordance with the size of grain to be scoured or cleaned, after the
mill is put in position ready for operation.
i
The staves H have screw threaded apertures near their top and similar sorew
threaded apertures / near their bottom, to accommodate set screws M and N. Set
screws.m and n are provided on the side flanges I, to hold the stone L.in whatever
position it is placed by the set screws M and N. The stones L are provided with
set screw seats M' for the purpose of protecting said stone from the wear of the
several screws.
The top and bottom of the staves H are provided with outwardly projecting
lugs and P, respectively, which have apertures to receive bolts or set screws o
and P, for securing the staves to the top and bottom of the mill casing.
It will be observed that these several staves form the casing of the mill, and one
or more of which may be removed, for cleaning or repairing, without disturbing the
remaining staves, and by the stones L being adjustably arranged in the staves H,
the grain space, or the space between the stones and the conical brush may be
readily graduated to suit the size of grain to be operated upon.
Should the brush become more worn at the top than at the bottom, the Bet
screws m and n are loosened, and the set screws M and N have simply to be moved
so as to force the stones in the desired position.
To regulate the grain space the several set screws are operated until the desired
space is acquired.
It will be observed that by my arrangement and construction of the staves, and
the stone therein, that a continuous surface of stone is presented to the brush, as the
bevelled flanges I allow the edges of the stone in one stave to come in direct contact
with the blocks of stone contained in the staves on either side thereof, so as to avoid.
having an interval or space between any of the said blocks of stone.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is.:-
1. In combination with a grain scouring mill, a casing consisting of a series of
wedge shaped staves provided with bevelled edge flanges, substantially as shown
and described and for the purpose set forth.
2. In a grain scouring mill, the conical brush, the grain spreaders secured to the
bottom thereof on either side of the shaft of the brush, in combination with the top
of the mill and a fan adapted to be operated therein by the revolution of the brush,
the bottom having an aperture which opens into a chamber, and a sieve located
between the aperture and the chamber, substantially as and for the purpose set
forth.
3. In a grain scouring mill, the combination of the conical brush and a casing
therefor composed of wedge shaped staves having bevelled flanges and the set
screws M and n, with the concave blocks of stone secured in the staves and provided
with metal seats for the set sorews, and stones arranged to project out of the staves
beyond the flanges thereof so as to form a continuous stone surface, substantially as
set forth.
4. In a grain scouring mill, the combination of the brush and the staves
surrounding the same, of the stone blocks having a concave scouring surface and a
series of metal set screw seats, substantially as shown and described and for the
purpose set forth.
Deted this 20th dow of lune 1801
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.