Improvements in Grain Cleaning and Separating Platform Sieves or Screens.
Year: 1892

page_text: Date of Application, 24th Mar., 1892
Complete Specification Left, 21st Oct., 1892-Accepted, 26th Nov., 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by CHARLES CLOSZ, of St. Ansgar, Mitchell
County, Iowa, U.S.A., Miller.]
Improvements in Grain Cleaning and Separating Platform Sieves
or Screens.
I, REGINALD WALTER BARKER, of Monument Chambers, King William
Street, London, Middlesex, Patent Agent, do hereby declare the nature of this
invention to be as follows:
My invention relates to grain cleaning and separating platform sieves or screens,
formed of sheet metal, and its object is to provide a sieve or screen capable of
handling a greater bulk of grain than sieves or screens heretofore used, and without
choking or clogging the openings, thus effecting a most desirable result.
These objects I attain by stamping the metal in approximately bow-shaped
perforations and the subsequent raising and depressing of the metal, and the
arrangement of the openings in relation to each other.
I form inverted V shaped corrugations between the series of openings for
strengthening the sieve, directing the grain into the openings and forming an
elevated track for the chaff and straws.
The openings result from elevating and depressing the metal after the same has
been cut or perforated, no part of the metal being cut away.
The centre of the bow-shaped cut or perforation may be on a straight line with
the ends of same, or forward or backward of a straight line according to the uses
to which the sieve may be put.
Dated this 24th day of March 1892.
REGINALD W. BARKER.
COMPLETE SPECIFICATION.
Improvements in Grain Cleaning and Separating Platform Sieves
or Screens.
I, REGINALD WALTER BARKER, of Monument Chambers, King William
Street, London, Middlesex, Patent Agent, 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:-
For cleaning and separating grain from chaff, straw, weeds, husks, silks cobs, etc.
I have provided an improved sheet metal corrugated platform screen for use in
separators and cleaners for preparing grain for milling. In its construction, the
surface of the screen and its peculiar form of openings produced from bow shaped
cuts, constitutes the essential feature of my invention and is designed to give the
most effective separating and cleaning action to the grain as it moves forward over
the screen and to prevent clogging or choking of the openings. In the claims
concluding this Specification I will point out the novel features of this screen in
connection with the accompanying drawings in which:
Figure 1 shows my new screen in top view.
Fig. 2 is a vertical longitudinal section on the line a of Fig. 1.
Fig. 3 is a cross section on the line b looking toward the receiving end of the

page_text: Fig. 5 shows in perspective one of the surface lobed divisions formed between
the cuts and which form the boundaries thereof.
Fig. 6 shows a diagram of the opening and
Fig. 7 shows in top view one of the lobed divisions.
The screening platform is preferably constructed of a single sheet of metal with
longitudinal parallel raised corrugations 2 and between these corrugations trans-
verse cuts are inade of such distance apart as to produce comparatively narrow
transverse sections. Each section is raised at one edge of the cut and depressed
at the other and forms an elevated double lobed transverse ridge, standing toward
the tail end of the screen, overhanging the opening and forming between the lobes
a receding edge curving upward and from which a convex surfaced ridge stands
centrally toward the receiving end of the screen and terminates at the under edge of
the opening. This construction in connection with the surface conformation on
each side of the central convex ridge, gives the best effect in dissecting the grain
into the openings and the straw and foreign matters over such surface conformation
and along the walls of the corrugations. These bow shaped openings extend from
the base of one corrugation to the base of the other, and back of the forward
standing edge 3, the surface has a slight concave triangular space 4 along the base
of each corrugation from which triangular shaped space 4 said edge rises in a lobe 5
at each side of a longitudinal centre line of the openings. Between these lobes 5
the said edge recedes into said centre line and terminates at its highest point 6 in
an elevated convex surfaced ridge 7 which stands toward the receiving end of the
screen and terminates in a point 8 at the under edge of the opening about on a
level with the triangular surfaces 4 along the corrugations 2.
These lower ridge
points 8 are the counterpart of upper edge lobed or scalloped conformation and
from each ridge 7 the surface slopes laterally in a gentle concave corresponding
with the lobed edge and rising in the curve to the points of the cuts.
The surface between the raised and depressed edges is divided by an oblique
convex ridge 9 which extends from the lobe edge at 10 to the point of the cut
and separates the triangular spaces 4 at the elevated edge of the cut from the
sloping concave surface at the depressed edge of the cut. The openings formed by
these edge conformations gives the widest parts of the openings at points 11
between the overhanging lobes and the under sloping surface and from these
points the opening gradually decreases in width to the points of the openings and
to the receding centre or scallop between the lobes, as seen in Fig. 6.
This construction gives a longitudinal surface ridge between the lobes formed
by the receding points 6 which are higher than the lobes and slope backward
showing an opening of bow shape. The bow shaped elevated edge is particularly
effective in facilitating and aiding the forward movement of the grain over the
openings and dissecting it into them and promoting an effective blast through the
openings and over the sloping backs of the raised lobed sections; and to provide
an efficient screening capacity and rigidity of the screen surface.
It is important to notice that the conformation of the centre raised edges of the
transverse surface sections form, by their receding highest points and lobes standing
forward on each side of said receding highest points, a series of transverse scallops
or steps at the elevated edge, the lobes forming two of the steps and the receding
points the intermediate step, and it is this construction given by the bow shaped
cut, which conduces to the effectiveness of the movement of the grain and foreign
matters over the screen with satisfactory cleaning and separating action.
The platform can be of any suitable length and width and may be framed if
desired.
The receding or edge indentations may be deeper, and the lobes may be more
pointed, but I prefer the bow shaped edge lobed or scalloped, as shown; and I
prefer to give the convex central ridge surfaces a pitch of about 30 degrees and
merging into the side concave surfaces 12 which extend along the oblique ridges 9
to the points at the base of the corrugations.

page_text: Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. A sheet metal platform screen formed with longitudinal surface rows of
openings produced from approximately bow shaped cuts in transverse relation, the
raised edges of the cuts overhanging said openings in forwardly projecting lobes,
terminating in an intermediate receding indentation or scallop which forms a
convex surfaced ridge terminating in the depressed edge of said cut, substantially
as described.
2. A. sheet metal platform screen formed with longitudinal surface rows of
openings produced from approximately bow shaped cuts in transverse relation, the
raised edges of the cuts overhanging said openings in forwardly projecting lobes
terminating in a higher intermediate receding scallop or indentation forming a
sloping convex back terminating in a point in the depressed edge of the cut, sub-
stantially as described.
3. A sheet metal platform having longitudinal corrugations and intermediate
transverse openings produced from approximately bow shaped cuts in transverse
relation, the forward standing edge of each cut being raised and having lobes
divided by a receding curved or scalloped elevation forming transverse edge steps
or scallops overhanging said opening substantially as described.
4. A sheet metal screen having longitudinal rows of transverse openings pro-
duced from approximately bow shaped cuts forming elevated forward standing
lobes divided by a receding curved elevation or scallop sloping backward to a lower
edge point and laterally from said elevation to give the greatest width of opening
under the lobes, substantially as described.
5. A screen for grain separating platforms having longitudinal rows of transverse
openings produced from approximately bow shaped cuts, the raised forward
standing edge whereof has lobes and an intervening scallop, a central convex
surface ridge standing backward from said edge scallop, an oblique convex surface
ridge extending from each lobe edge to the point of the cut dividing the surface
between the cuts into rearward surfaces extending from each side of the ridge to
the points of the cuts and into triangular forwardly sloping surfaces at the points
of the cuts, substantially as described.
Deted this 20th day of October 1892