IMPROVEMENTS IN ROTARY SCREENS
Year: 1862

page_text: LETTERS PATENT to Arthur Wallis and Charles Haslam, of Basingstoke,
in the County of Southampton, Engineers and Ironfounders, for the
Sealed the 4th July 1862, and dated the 7th January 1862.
PROVISIONAL SPECIFICATION left by the said Arthur Wallis and Charles
Haslam at the Office of the Commissioners of Patents, with their
Petition, on the 7th January 1862.
We, ARTHUR WALLIS and CHARLES HASLAM, of Basingstoke, in the
County of Southampton, Engineers and Ironfounders, do hereby declare the
nature of the Invention for "IMPROVEMENTS IN ROTARY SCREENS," to be as
follows:-
This Invention has for its object improvements in the manufacture of
rotary screens.
Rotary screens, that is to say, cylinders of wirework, each mounted on an
axis concentric with the cylinder, and suitable for sifting or cleaning grain or
other material, have heretofore usually been constructed by coiling wire in
a spiral direction round a frame of the required form, made of metal bars, and
the wire has been secured by binding it to the bars with fine binding wire.
Screens thus constructed are however liable to get out of gauge. According
to our Invention, in forming rotary screens we make up a frame of metal

page_text: bars, as before, and these bars are notched at the periphery of the drum
externally at the places where the wire (which is applied as before or in
separate hoops) rests upon them. These notches prevent the wire moving
laterally, and it is prevented springing out of the notches by rivetting over the
projections or studs between the coils of wire. We would remark that the
wires of flat screens have in some cases been secured by laying them in notched
bars, and rivetting over the studs left between the notches, and in a certain
description of rotary screens also the wire has in some cases been fitted into
notches in the bars of the frame, but the notches have in this case been
within the cylinder, in place of on the outside thereof; the bars of the frame
have consequently been exterior of the wire. The screens so made heretofore
have been self-cleaning or compound screens, in which the distances between
the wires are adjusted, and the wires have been secured by solder in place of
by rivetting. The securing the wires within notches at the exterior of the
frame, in place of within the same, is an important part of our Invention,
partly because it allows clearers to be used, consisting of spring points
mounted exterior of the screen, and entering between the wires; these
points remove any obstruction from between the wires. The clearer may
either consist of a wire or whalebone brush, or, where the wire is put on in
hoops, points of spring steel entering some distance into the drum may be
used; these points will readily spring over the bars of the frame.
Although we prefer to secure the wire by rivetting, it may be secured by
soldering, as heretofore, when the notches and wire have been within the
cylinder, or if the wire be wound on spirally, and sufficiently tight, its own
tension will suffice to retain it in the notches; or, in place of notching the
bars, we in some cases bore holes in the bars close to their edges and we
thread the wire through these holes. The bars of the frame we sometimes
make hollow, and we sometimes form the notches in the bars by cutting screw
threads or parts of screw threads upon them. At the end of the cylinder into
which the corn is admitted we place a disc of any material, either flat or
concave, of a smaller diameter than the cylinder itself, in order to cause the
corn to fall on the part of the screen nearest to where it is admitted, so as to
ensure its being screened as much as possible. The spindle on which the
cylinder is fixed we place in suitable bearings in such a manner that the screen
inclines slightly, so as to cause the corn to work along the screen, and pass
out at the other end, or, if preferred, a worm or internal screw may be placed
inside the screen, as heretofore, to cause the corn to work along the screen,
and the screen fixed horizontally.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Arthur Wallis and Charles Haslam in the Great Seal Patent
Office on the 7th July 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, ARTHUR
WALLIS and CHARLES HASLAM, of Basingstoke, in the County of Southampton,
Engineers and Ironfounders, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventh day of January, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-fifth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said Arthur Wallis and Charles Haslam, Her special licence that we, the
said Arthur Wallis and Charles Haslam, our executors, administrators, and
assigns, or such others as we, the said Arthur Wallis and Charles Haslam,
our executors, administrators, and 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
ROTARY SCREENS," upon the condition (amongst others) that we, the said
Arthur Wallis and Charles Haslam, our executors or administrators, by an
instrument in writing under our or their hands and seals, or under the hand
and seal of one of us or them, should particularly describe and ascertain
the nature of the said Invention, 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.
NOW KNOW YE, that I, the said Arthur Wallis, on behalf of myself and
the said Charles Haslam, do hereby declare the nature of the said Invention,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement thereof, that is to say:-.
This Invention has for its object improvements in the manufacture of
rotary screens.
Rotary screens, that is to say, cylinders of wirework, each mounted on an
axis concentric with the cylinder, and suitable for sifting or cleaning grain or
other materials, have heretofore usually been constructed by coiling wire in
a spiral direction round a frame of the required. form made of metal bars, and
the wire has been secured by binding it to the bars with fine binding wire,
Screens thus constructed are, however, liable to get out of gange. According

page_text: to our Invention, in forming rotary screens we make up a frame of metal
bars as before, and these bars are notched at the periphery of the drum
externally at the places where the wire (which is applied as before or in
separate hoops) rests upon them. A portion of a bar made with notches
ready to receive the wires is shewn at Figure 1 of the Drawings hereunto
annexed, and when the bars so formed are made up into a frame, these notches
are to be on the exterior of the frame. The notches in the bar receive the
wire, and prevent it moving laterally. The wire is prevented springing out
of the notches by rivetting over the projections or studs between the coils of
wire, as shewn at Figure 2, the wires being there shewn in section. We
would remark that the wires of flat screens have in some cases been secured
by laying them in notched bars, and rivetting over the studs left between the
notches, and in a certain description of rotary screens also the wire has in
some cases been fitted into notches in the bars of the frame, but the notches
have in this case been within the cylinder in place of on the outside thereof,
the bars of the frame have consequently been exterior of the wire. The
screens so made heretofore have been self-cleaning or compound screens, in
which the distances between the wires are adjustable, and the wires have been
secured by solder in place of by rivetting. The securing the wires within
notches at the exterior of the frame, in place of within the same, is an
important part of our Invention, partly because it allows clearers to be used,
consisting of spring points mounted exterior of the screen and entering
between the wires; these points remove any obstruction from between the
wires. The clearer may either consist of a wire or whalebone brush, or,
where the wire is put on in hoops, points of spring steel entering some distance
into the drum may be used. These points will readily spring over the bars
of the frame; but to the constructing and arranging clearers in this manner
we make no claim.
screw threads upon
Although we prefer to secure the wire by rivetting, as above described, it
may be secured by soldering, as heretofore, when the notches and wire have
been within the cylindrical frame, or if the wire be wound on spirally, and
sufficiently tight, its own tension will suffice to retain it in the notches. The
bars of the frame we sometimes make hollow, and we sometimes form the
notches in the bars by cutting screw threads or parts of
them. At the end of the cylinder into which the corn is admitted we, by
preference, place, as has before been proposed, a disc of any material, either
flat or concave, of a smaller diameter than the cylinder itself, in order to
cause the corn to fall on the part of the screen nearest to where it is admitted,
so as to ensure its being screened as much as possible. The spindle on which

page_text: the cylinder is fixed we place in suitable bearings in such a manner that the
screen inclines slightly, as usual, so as to cause the corn to work along the
screen, and pass out at the other end; or, if preferred, a worm or internal
screw may be placed inside the screen, as has also before been done, to cause
the corn to work along the screen, and the screen be fixed horizontally.
In witness whereof, I, the said Arthur Wallis, have hereunto set my
hand and seal, this Fourth day of July, in the year of our Lord One
thousand eight hundred and sixty-two.
ARTHUR WALLIS. (L.S.)