IMPROVEMENTS IN SCREENS OR SIFTERS
Year: 1877

page_text: LETTERS PATENT to William Edward Price, of Hampton Wick, in the County of
Middlesex, Sub-manager of Gas Works, for the Invention of " IMPROVEMENTS
IN SCREENS OR SIFTERS."
Sealed the 20th October 1877, in pursuance of an Order of the Lord Chancellor, and
Sealed the 20th October 1877, in pursuance of an Order of the Lord Chancellor, and
dated the 12th April 1877.
PROVISIONAL SPECIFICATION left by the said William Edward Price at the
Office of the Commissioners of Patents on the 12th April 1877.
WILLIAM EDWARD PRICE, of Hampton Wick, in the County of Middlesex, Sub-
manager of Gas Works. "IMPROVEMENTS IN SCREENS OR SIFTERS."
My improved screen is mounted on a cast or wrought-iron frame which is well
supported by suitable bolts and stays, and to which four links, about eight inches
long, are attached by means of bolts and nuts, which secure the links to the said
frame at the top ends, whilst the bottom ends are bolted to the screen in such a
manner as to allow it to move backwards and forwards by turning a wheel to which
a crank shaft is attached, giving motion to the screw. A second or third screen may
be secured to the former, of a finer mesh, by small links, which are made to move in
the same manner and at the same time, and are so fixed as to convey the sifted
material into a barrow ready to receive it at the back part of the machine, whilst
the first screen shoots its contents into a barrow standing at the opposite end.
The machine is mounted on two wheels at the hind part, with handles in front,
for the convenience of removing it to any place where required.
The advantages arising from my Invention will be a great saving of labor, owing
chiefly to the case and facility with which the material is sifted and the machine
made to work, giving two different sizes of sifted material, whilst the fine at the
same time falls to the bottom.

page_text: This Invention is especially adapted for screening breeze, but it is also applicable
for screening gravel, coal, or any other material.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Edward Price in the Great Seal Patent Office on the 24th
October 1877.
WILLIAM EDWARD PRICE, Sub-manager of Gas Works, Hampton Wick, in the
County of Middlesex. "IMPROVED SCREEN OR SIFTER."
My improved screen or sifter is mounted on a cast or wrought-iron frame which
is well supported by suitable bolts and stays, and to which four links, about eight
inches long, are attached by means of bolts and nuts, which secure the links to the
said frame at the top ends, whilst the bottom ends are bolted to the screen in such
a manner as to allow it to move backwards and forwards by turning a wheel to
which a crank shaft is attached, giving motion to the screen. Below the screen is
attached a sheet-iron tray, which moves in the same manner and at the same time,
for the purpose of conveying the fine material into a barrow at the back part of the
A second screen of a finer mesh may be attached beneath the top one if
needed by means of small links, in which case the sheet-iron tray would be below,
and each shooting the sifted material in opposite directions into barrows placed at
each end of the machine.
machine.
The improved screen or sifter is so constructed as to be mounted on two wheels
at the hind part if needed, and with handles in front, for the convenience of removing
it to any place where required.
The following is a description of the machine:-A is a cast or wrought-iron frame
well supported by bolts and stays, and on which the screen is suspended; B is the
screen, to which a wire mesh of any size can be attached by small bolts or other
means; C, C, are the swinging links which are bolted to the screen B, and also
to the frame A. A backward and forward motion is given to the screen by means
of the crank and connecting rod D, D¹, which are moved by the spur and
pinion E, E', by turning the fly wheel, which is fastened to the other end of the
spur spindle.
In screening coke breeze, the coarse material falls on a tray supported by the
handles of the machine, making it convenient for picking out the clinkers from the
same, whilst the fine falls on the tray below, which shoots it into a barrow behind,
but in screening gravel the coarse is sifted into a barrow direct.
Figure 1 represents side elevation, showing top frame, in which the wire mesh is
fastened, and the sheet-iron tray attached below.
Fig. 2, plan taken over all, showing the wire mesh, spur, and pinion, and fly wheel,
which gives motion to the machine.
Fig. 3, back end elevation, showing the swinging links which support the screen
and tray.
The advantages to be gained by my Invention will be a great saving of labour
and expense in its use, owing to the facility it affords in sifting material, at
the same time seperating and discharging the coarse and fine to the position
required.
Having thus explained the nature of my Invention and the manner of carrying
the same into effect, it must be understood that I do not confine myself to any
particular form of the various parts of the machine, but under the above in part
recited Letters Patent I claim, the mode by which the screen and tray are supported,

page_text: viz., on swinging links, to which the backward and forward motion is given by
turning the fly wheel, as before described.
In witness whereof, I, the said William Edward Price, have hereunto set
my hand and seal, this Twenty-fourth day of October, in the year of our
Land 1977
Witness,
EDW³. PRICE,
Engineer,
Gas Works,
Hampton Wick,
Middlesex.
WILLIAM EDWARD PRICE. (L.S.)