IMPROVEMENTS IN SCREENS USED FOR THE PURPOSES OF SIFTING, RIDDLING, SORTING OR SEPARATING
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I JAMES TUSHAW of the City Road Patent Agency Offices 132 City Road,
London, EC. in the County of Middlesex, Engineer, do hereby declare the nature
of my invention for IMPROVEMENTS IN SCREENS USED FOR THE PURPOSES OF
SIFTING, RIDDLING, SORTING OR SEPARATING, to be as follows:-
My invention relates to improvements in the construction of screens used for
a variety of purposes in which the operations of riddling, sifting, sorting, or
separating have to be performed; such for instance as in screening gravel and
sand, breeze and ashes, fine coal and coal dust, lime and cement; screens used in
the manufacture of artificial stone, for separating the pulvurent ingredients
employed in said operation or manufacture. Screens used in gold and silver
mining; and also in connection with exploiting or working diamond fields, for
treating the crushed or pulverised diamondiferous conglomerates. Screens for the
treatment of grain, seeds, or kernels; as also screens used in the processes of
separation or filtration adopted in the treatment of various fluids and semi-
fluids; oleaginous, saccharine and viscous fluids and matters such as coal tar and
the like.
My improvements in the construction of screens such as herein before referred to,
relate to the means adopted for giving the necessary amount of strength and
rigidity to the wires employed as the meshes in making up or forming said and
other screens. That is to say, instead of accomplishing the latter object by lacing
or binding the said screening wires together or otherwiso securing same and
strengthening them, I adopt the following method:-Say for instance in con-
structing a screen such as is used for screening ashes, or for lime or cement-in
which the sifting wires are arranged parallelwise longitudinally, within a wood or
other framing or enclosing receptacle.-In order to support and give the necessary
amount of strength and rigidity to said longitudinal wires, I employ strips of angle
iron punched with holes of a diameter and distance apart corresponding with said
longitudinal screen wires, and in length, equal to the width of the screening
surface. The number of such transverse angle iron supports as also the dimensions
of same in cross section being proportionate to the area of the screening surface.
and the purpose or purposes to which said screens are intended to be put. The

page_text: said longitudinal wires are passed through the holes formed in the transverse
supporting angle iron supports, the ends of same being let into or otherwise
secured to the side of the framework of the screen.
Though I have described my invention as applied to one particular type of
screen, namely one of rectangular shape, it is equally applicable to cylindrical and
other forms of screens; and is also irrespective of the contour or configuration of
said angle iron supports which may either be straight, curved, or corrugated, or
otherwise formed.
As a convenient and rapid method of accomplishing the punching of said angle
iron supports it will be found advantageous to adopt for this purpose the
automatic self-feeding rapid punching machines patented by me in 1882, N° 777,
and in 1884, N° 844.

page_text: I JAMES TUSHAW of the City Road Patent Agency Offices 132 City Road
London EC. Engineer do hereby declare the nature of my Invention for
"IMPROVEMENTS IN SCREENS USED FOR THE PURPOSES OF SIFTING, RIDDLING,
SORTING OR SEPARATING, "and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:-
My improvements in the construction of screens such as those used for the
purposes described in the Provisional Specification of my said Invention, relate to
the means adopted for supporting and giving the necessary amount of strength and
rigidity to the wires employed in making up or forming said and other screens.
In carrying out my Invention, I proceed as follows:-Say for instance in con-
structing a screen such as would be used for screening ashes, " breezo" or the like-
and in which the sifting wires are arranged parallel-wise longitudinally within a
wood or other framing.-In order to support and give the necessary amount of
strength and rigidity to said wires, I employ strips of angle iron of a diameter and
at a distance apart or gauge corresponding with said longitudinal screen wires.
The length of said supporting strips of angle iron being equal to the width of the
screening surface of the sieve; whilst, the number, and dimensions of same, in
cross section, are proportionate to the area of the screening surface of the siove as
also the purpose or purposes for which the latter is intended to be used.
The longitudinal wires of the sieve are passed or threaded through the holes
formed in the transverse supporting angle iron strips aforesaid, and the ends of
said angle iron strips are let into or otherwise secured to the side frame work of
the screen.
I wish it to be understood that though I have, with a view to define the
utility of my said Invention,-described my Improvements as applied to only one
class or type of screen, said Invention is equally applicable to other forms of
screens.
Also the angle iron supports hereinbefore described and forming the subject
matter of my Invention may either be straight, curved, or corrugated as regards
their outline or configuration.
As a means of punching the holes in the angle iron supports aforesaid with
accuracy and great rapidity the automatic punching machines patented by me
Numbers 771 and 844 respectively, will be found to be specially adapted and
may be used with great advantage for that purpose.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is
The use of punched angle iron supports in screens used for the purposes of
sifting, riddling, sorting or separating, substantially as herein described and set
forth.
Dain thi with dow of Nah 100K