IMPROVEMENTS IN SCREENS FOR SCREENING GRAIN AND UTANK SUBSTARVED.
Year: 1866

page_text: LETTERS PATENT to William Wyatt, of Bury St. Edmonds, in the
County of Suffolk, Gentleman, for the Invention of "IMPROVEMENTS IN
SCREENS FOR SCREENING GRAIN AND UTANK SUBSTARVED.
Sealed the 21st December 1866, and dated the 27th June 1866.
PROVISIONAL SPECIFICATION left by the said William Wyatt at the
Office of the Commissioners of Patents, with his Petition, on the
27th June 1866.
I, WILLIAM WYATT, of Bury St. Edmonds, iu the County of Suffolk,
Gentleman, do bereby declare the nature of the said Invention for "IM-
PROVEMENTS IN SCREENS FOR SCREENING GRAIN AND OTHER SUBSTANCES," to be as
follows:-
be
This Invention relates to a peculiar construction, arrangement, and combi-
nation of rotary apparatus for screening corn or other substances, whereby the
screen or apparatus for screening the said corn or other substances may
readily adjusted so as to screen or sift the said substances to any size which
may be desirable, and consists in the employment of short bars having by
preference a triangular section, and fastened at their ends by rivets or other-
wise to longer bars, the smaller bars having regular and parallel spaces

page_text: between each other (through which spaces the screened substances pass), and
being so fastened to the longer bars as to allow them to move on the rivets or
other fastenings at their ends so that by moving the longer bars in a horizontal
direction the parallel spaces between the shorter ones may be opened or closed
to any desired width. Any number of parts as above are to be arranged so
as to form a hollow drum or polygon, and fitted with a screw or any other
suitable mechanical arrangement for giving motion to the said bars in the
required direction. A rotatory motion is to be given to the said combination by
means of a shaft passing through the longer axis of the polygonal prism,
which is to be set at such an inclination that the corn or other substance
being fed in at the higher end may pass through, and in so doing be submitted
to the screening or sifting action of the herein-before described adjustable
bars.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Wyatt in the Great Seal Patent Office on the
26th December 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
WYATT, of Bury St. Edmunds, in the County of Suffolk, Gentleman, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-seventh day of June, in the year of our
Lord One thousand eight hundred and sixty-six, in the thirtieth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto.
me, the said William Wyatt, Her special license that I, the said William
Wyatt, my executors, administrators, and assigns, or such others as 1,
the said William Wyatt, my executors, administrators, or assigns, should
at any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN SCREENS FOR SCREENING GRAIN AND OTHER SUBSTANCES,"
upon the condition (amongst others) that I, the said William Wyatt, my
executors or administrators, by an instrument in writing under my hand and
seal, should particularly describe and ascertain the nature of the said Inven-
tion, and in what manner the same was to be performed, and cause the
same to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said William Wyatt, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the fol-
lowing statement reference being had to the accompanying Drawings, and to
the letters and figures marked thereon, that is to say :-
My said Invention relates to a peculiar construction, arrangement, and
combination of apparatus for screening corn or other substances, whereby
the screen or apparatus for screwing the said corn or other substances may
be readily adjusted so as to screen or sift the said substances to any size
which may be desirable, and consists in the employment of short bars, having
by preference a triangular section, and fastened at their ends by rivets or
otherwise to longer bars, the smaller bars having regular and parallel spaces
between. each other (through which spaces the screened substances pass), and
being so fastened to the longer bars as to allow them to move on the rivets
or other fastenings at their ends, so that by moving the longer bars in a
longitudinal direction the parallel spaces between the shorter ones may be
opened or closed to any desired width..
Any number of parts as above may be arranged so as to form a bollow
drum or polygon provided with a screw or any other suitable mechanical
arrangement for giving motion to the said bars in the required direction. A
rotary motion is given to the said combination by means of a shaft passing
through the longitudinal axis of the pologonal prism which is to be set at
such an inclination that the corn or other substance being fed in at the
higher end may pass through it, and in so doing be submitted to the screening
or sifting action of the herein-before described adjustable bars.
And in order that my said Invention may be fully understood I shall
now proceed more particularly to describe the same, and for that purpose I
shall refer to the several Figures on the annexed Sheet of Drawings, the
same letters of reference indicating corresponding parts in all the Figures.
Figure 1 of the annexed Sheet of Drawings represents a partial side
elevation and longitudinal section of one form of my improved adjustablo
screen; Figure 2 is a partial end elevation and transverse section of the
same as viewed from the lower end of the screen; Figure 3 is an enlarged
detail elevation of a portion of the surface of the screen, the red lines
showing the screening bars in their angular position. Figure 4 is a corre-
sponding transverse section of the same; and Figures 5, 6, and 7 are full-
sized detail transverse sections of different forms of bars which may be
employed in constructing the screening surface.
A, A, represent the two end frames of the polygonal screen; they are

page_text: provided, each with a central boss, and are keyed on to the longitudinal spindle
or shaft B, which forms the axis of the screen, and which is supported in an
inclined position in ordinary bearings C, C, secured to convenient standards
or supports D, D. The radial arms a, a, of the end frames A, support the
longitudinal fixed parallel bars b, b, one of which is shown more clearly in the
details, Figures 3 and 4. The intermediate or alternate arms c, c, of the end
frames serve to support the longitudinal sliding or adjustable parallel bars d, dễ,
also shown clearly in Figures 3 and 4. These bars d, d, are each secured in
any convenient manner at one end to the set of adjustable radial arms E, E,
attached to or forming part of a central boss F. In the interior of this boss
there is fitted, by means of a pin and annular groove, a nut e, which is
capable of being rotated by the hand wheel f. This nut works on a screwed
portion g of the main shaft or spindle B, so that by turning the nut in one
direction or the other the radial arms E will be adjusted nearer to or further
from the end of the screen, and will cause the longitudinal sliding or adjust-
able bars d, d, to move in the direction of the length of the screen. G, G,
are a series of short parallel bars of a round, flat, or triangular section, as
shown in Figures 5, 6, and 7, which bars are pinjointed or pivotted at their
opposite extremities to the longitudinal sliding or adjustable bars d, d, and
to the bars h, h, respectively. These bars h, h, are capable of sliding laterally
or transversely upon the flanges of the longitudinal fixed parallel bars b, b,
(see Figures 3 and 4), but have no longitudinal motion, and they are kept in
their places by an overlapping lip or flange i formed on the extremity of each
of the radial arms a, a, of the end arms A. The longitudinal sliding bars
d, d, are held in position and guided during their adjustment by one or more
series of radial arms H keyed on to the shaft B inside the screen. These
arms are perforated at their extremities, and through the perforations slide
the guiding pins & secured to the under sides of the longitudinal adjustable
bars d. The grain or other substance to be screened, may be introduced
into the screen from a hopper I, the lower mouth of which opens into a
species of hood K secured to the receiving end of the screen, such hood
rotating with the screen. In order to prevent any escape of the substances
through the openings left at 1, l, when the bars G, G, are made to assume an
angular position (as shown in Figure 1), I line the upper end of the screen
for a short distance down with a metal plate m, so that the grain or other
substance on first entering the screen will be received on this plate, and will
thence enter upon the screening bars G, G. A continuous or reciprocating
rotatory motion may be imparted to the screen in any convenient manner, as
for example, by means of ordinary driving pulleys keyed on to the shaft B,

page_text: or by the well-known mangle wheel and pinion arrangement if a reciprocating
circular motion be required, or the screen may be made flat and receive
a vibratory motion.
From the foregoing description and Drawings it will be readily understood
that by simply turning the nut e the several bars G, G, will be made to
assume a greater or less angle, and consequently the guage of the screening
openings or spaces between such bars may be varied to suit the substance
operated upon, since the more oblique the direction of the bars G the smaller
will be the intervening spaces, as will be clearly understood on referring to
Figure 3, where the bars are shown in two different angles.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be carried into
effect, I would observe, in conclusion, that what I consider to be novel and
original, and therefore claim as the Invention secured to me by the herein-
before in part recited Letters Patent is,—
First, the general construction and arrangement of adjustable polygonal
screens, substantially as herein-before described and illustrated by my
Drawings.
Second, the combination in polygonal screens of longitudinal and lateral
sliding bars with angularly adjustable screening bars, arranged and adjusted
substantially as and for the purpose herein-before described.
Third, the system or mode of adjusting or varying the size of the screening
openings in polygonal, flat, or other screens by the employment of a scries
of parallel bars which are caused to assume a more or less oblique position,
substantially as herein-before described.
In witness whereof, I, the said William Wyatt, bave to this my Specifi-
cation hereunto set my hand and seal, this Seventeenth day of
December, One thousand eight hundred and sixty-six.
WILLIAM WYATT. (L.B.)