IMPROVEMENTS IN ROTARY SCREENS FOR SCREENING OR SEPARATING GRAIN SEEDS AND OTHER MATERIALS 31
Year: 1883

page_text: LETTERS PATENT to Harry Shield and William Norris Crockett both of the
town and County of Nottingham for an Invention of "IMPROVEMENTS IN
ROTARY SCREENS FOR SCREENING OR SEPARATING GRAIN SEEDS AND OTHER
MATERIALS
31
PROVISIONAL SPECIFICATION left by the said Harry Shield and William
Norris Crockett at the Office of the Commissioners of Patents on the
29th May 1883.
HARRY SHIELD, and WILLIAM NORRIS CROCKETT, both of the Town and County
of Nottingham, "IMPROVEMENTS IN ROTARY SCREENS FOR SCREENING OR
SEPARATING GRAIN, SEEDS AND OTHER MATERIALS."
This Invention has for its object improvements in rotary screens for screening
all kinds of grain, seeds, and other materials, and relates to a simple means whereby
the screen can be readily cleaned without the aid of a brush-For this purpose,
we form rotary screens, preferably of one continuous wire (but if desired, two or
more coils of wire or separate wire rings may be employed), coiled around a
suitable number of other wires or rods arranged in a helical direction, so as to pass
partly, entirely, or even more than once around the screen, as they run from end
to end of it.-The coils are attached to the helical wires or rods by means of
binding wire as is usual-Rotary screens thus constructed may readily be
compressed or extended longitudinally so as to vary the gauge or mesh as required.-
In mounting these screens, they are connected at their ends to rings supported by
arms from an axis, the rings can be moved to or from each other by a screw as is
usual, or otherwise, and one of the rings is able to turn on the axis
The helical wires or rods are corrugated so as to form a spiral or spirals passing
around the screen, so that the rotation of the screen causes its contents to be
propelled from one end to the other, without the aid of a sheet iron worm or
spiral. In order to make these screens self cleaning, we put discs upon the axis,
said discs having two bevel flanges, (after the form of a groove pulley) one flange
to be made separate and fastened to the other by means of a suitable number of
[Price dr

page_text: bolts and nuts or otherwise, after the boss attached to the supporting arms has
been put upon said disc; the boss being larger than the disc, causes the top of the
screen to be always somewhat more extended than the bottom;-this causes any
grain etc which may have become jammed between the wires at the bottom to be
set free at the top
Hitherto, the extending of the top of the screen has been brought about by
revolving the screen around a bent axis etc, but our Invention is to keep the top
of the screen more extended than the bottom whilst the axis is being revolved in
the usual way with the screen.
In a similar manner we make the screens known as the "Penney" and the
"Rainforth" self cleaning (and any other flexible or rotary screens)

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Harry Shield and William Norris Crockett in the Great Seal
Patent Office on the 29th November 1883.
HARRY SHIELD, and WILLIAM NORRIS CROCKETT, both of the Town and County
of Nottingham. IMPROVEMENTS IN ROTARY SCREENS, FOR SCREENING OR.
SEPARATING ALL KINDS OF GRAIN, SEEDS, AND OTHER MATERIALS.
This Invention has for its object improvements in rotary screens for screening
all kinds of grain, seeds, and other materials, and relates to a simple means whereby
the screen can be readily cleaned, without the aid of a brush.
For this purpose,
we form rotary screens, preferably of one continuous wire (but if desired two or
more coils of wire, or separate wire rings may be employed,) coiled around a
suitable number of other wires, or rods arranged in a helical direction, so as to pass
partly, entirely, or even more than once, around the screen, as they run from end
to end of it. The coils are attached to the helical wires or rods by means of
binding wire as is usual. Rotary screens thus constructed may readily be
compressed or extended longitudinally, so as to vary the gauge or mesh as required.
In mounting these screens, they are connected at their ends to rings supported
by arms from an axis, the rings can be moved to or from each other, by a
screw as is usual, or otherwise, and one of the rings is able to turn on the axis.
The helical wires or rods, are corrugated so as to form a spiral or spirals passing
around the screen, so that the rotation of the screen, causes it's contents to be
propelled from one end to the other, without the aid of a sheet iron worm or spiral.
In order to make these screens self cleaning, we put discs upon the axis, said discs
having bevel flanges,-(after the form of a groove pulley) one flange to be made
separate and fastened to the other, by means of a suitable number of bolts and
nuts, or otherwise, after the boss attached to the supporting arms has been put
upon said disc; the boss being larger than the disc, causes the top of the screen to
be always somewhat more extended than the bottom; this causes any grain, etc,
which may have become jammed between the wires at the bottom, to be set free
at the top. Hitherto the extending of the top of the screen has been brought
about by revolving the screen around a bent axis, etc, but our Invention, is to
keep the top of the screen more extended than the bottom, whilst the axis is being
revolved in the usual way with the screen.
In a similar manner we make the screens known as the "Penny" and the
"Rainsforth" self cleaning, (and any other flexible or rotary screens.)
Having thus far described the nature of our Invention, We will now proceed
aided by the accompanying drawings, to further and particularly describe and
ascertain same,-that is to say
Figs 2, and 3, and 4, show detail views.
A is the screen mounted on a suitable frame as shown.
B is the shaft on to which is placed disc C, the boss D is then put on to the
disc C, then E is put on to the shaft B, and C and E are coupled together
by a suitable number of bolts or pins, a little play being allowed between the
disc C, and the boss D, the latter having a heavy run as shown, so that it
always falls forward, hence the top of the screen A is always more extended
than the bottom.

page_text: Having thus particularly described and ascertained our Invention, and in what
manner the same is to be performed and put in practice,-We hereby declare, that
we claim the said Invention of Improvements in rotary screens for screening or
separating all kinds of grain, seeds, and other materials; substantially as herein-
before set forth, and described, wherein the peculiar and important feature is
keeping the top of rotary screens more extended than the bottom, whilst they are
being revolved with, (not around) the axis
In witness whereof, We, the said Harry Shield, and William Norris Crockett,
have hereunto set our hands and seals, this twenty eighth day of November in the
year of our Lord One thousand eight hundred and eighty three