IMPROVEMENTS IN APPARATUS FOR SCREENING OR SIFTING GRAVEL, COALS, CINDERS, OR OTHER MATERIALS
Year: 1876

page_text: LETTERS PATENT to James Kemp, of Camberwell Green, in the County of
Surrey, Builder, for the Invention of "IMPROVEMENTS IN APPARATUS FOR
SCREENING OR SIFTING GRAVEL, COALS, CINDERS, OR OTHER MATERIALS."
PROVISIONAL SPECIFICATION left by the said James Kemp at the Office of
the Commissioners of Patents on the 27th May 1876.
JAMES KEMP, of Camberwell Green, in the County of Surrey, Builder.
"LM-
PROVEMENTS IN APPARATUS FOR SCREENING OR SIFTING GRAVEL, COALS, CINDERS,
OR OTHER MATERIALS."
My Invention consists in constructing apparatus for screening or sifting gravel,
coals, cinders, or other materials of an open work cylinder (of wire or other suitable
material) placed in a position slightly inclined from the horizontal, and made to
rotate continuously on its axis by a crank handle or otherwise. The cylinder has
a hollow axle or a central aperture at its upper end made sufficiently large to allow
of the introduction of the gravel or other material to be screened or sifted. The
gravel or material may either be thrown directly into the revolving cylinder
through this hollow axle or central aperture by shovels or spades, or it may be
supplied to a hopper or shoot the lower end of which leads into the hollow axle or
central aperture.
The crank handle or other device for imparting rotary motion to the cylinder
is situated by preference at the lower end, being connected to the lower axle or
journal of the cylinder, which is open at this end with the exception of arins or
spokes to give it the requisite support.
The gravel supplied at the upper end is turned over and over by the rotation
of the cylinder and gradually travels to the lower end, where it finds its exit, the
sand or dirt becoming meanwhile sifted or screened therefrom by passing through
the interstices in the periphery of the cylinder.
When required, in the caso of cinders for example, I regulate the supply to the
cylinder. One way in which this may be done is to place the cinders upon a
board or platform above the cylinder, from which they are gradually pushed into
the hopper or shoot by means of a pusher moving in guidos and worked by the
person who is turning the handle.

page_text: For sifting materials which require to be divided into several qualities, according
to the size of the grains or particles, I arrange several apparatus constructed as
above described one at a lower level than another and with open work cylinders
of gradually increasing coarseness, and so that the particles which escape at the
lower end of the cylinder of the first apparatus are conducted to the upper end of
the cylinder of the second apparatus, and so on, while the particles which pass
through the sides of the cylinders fall into separate receptacles.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Kemp in the Great Soal Patent Office on the 27th November
1870.
JAMES KEMP, of Camberwell Green, in the County of Surrey, Builder. "IM-
PROVEMENTS IN APPARATUS FOR SCREENING OR SIFTING GRAVEL, COALS, CINDERS,
OR OTHER MATERIALS."
My Invention consists in constructing apparatus for screening or sifting gravel,
coals, cinders, or other materials of an open work cylinder (of wire or other suitable 1
material) placed in a position slightly inclined from the horizontal, and made to
rotate continuously on its axis by a crank handle or otherwise. The cylinder has
a hollow axle or is open at its upper end to allow of the introduction of the gravel
or other material to be screened or sifted. The gravel or material may either be
thrown directly into the revolving cylinder through this hollow axle or open end 2
by shovels or spades, or it may be supplied to a hopper or shoot, the lower and of
which leads into the hollow axle or open end. The lower end of the cylinder is
also open and there is no axle or other part within the cylinder to obstruct the
working.
The crank handle or other device for imparting rotary motion to the cylinder 2
may be situated at either end.
Figure 1 of the annexed Drawings is an end elevation, and Figure 2 a side
elevation of an apparatus constructed according to my Invention, and suitable for
screening gravel.
A is the open work cylinder or rotary screen mounted in roller or antifriction
bearings B, B, which are carried by end frames or standards C, C. On one end
of the cylinder A a bevel wheel D is fixed, and into it gears a bevel pinion E, the
axle of which turns in a bearing F and is provided with a crank handle G for
imparting to it rotary motion.
3
The action is as follows:-Rotary motion being imparted to the cylinder A by 3
moans of the handle G and gearing E, D, and the gravel being supplied at the
upper end of the cylinder by a shovel or otherwise, the gravel is turned over and
over by the rotation of the cylinder and gradually travels to the lower end, where
it finds its exit, the sand or dirt becoming meanwhile sifted or screened therefrom
by passing through the interstices in the periphery of the cylinder.
When required, in the case of cinders for example, I regulate the supply to the
cylinder. One way in which this may be done is to place the cinders upon a board
or platform above the cylinder, from which they are gradually pushed into the
hopper or shoot by means of a pusher moving in guides and worked by the person
who is turning the handle.
Figures 3 and 4 are respectively a longitudinal and a transverse section of an
apparatus suitable for sifting cinders. A is the rotary screen or cylinder turning
on roller bearings B, B, which are carried by brackets C, C; D, E, is the bevel
gearing for transmitting rotary motion to the cylinder A from the crank handle G;
His a box in which the apparatus is enclosed; I is a platform within the box 5
between the lid K and the cylinder A; L is a pusher which can be moved along
the platform I by means of a handle M extending to the outside of the box, which
4
1

page_text: is slotted for the purpose; N is a shoot or hopper at the upper end of the cylinder.
The cinders to be sifted are thrown upon the platform I, the lid K is then closed,
and while rotary notion is imparted to the cylinder by the handle G the pusher L
is gradually pushed along the platform I by means of the handle N towards the
shoot N. The cinders are thus gradually pushed into this shoot and enter the
cylinder A. In travelling to the lower end of the rotating cylinder the ashes pass
through the interstices thereof and fall into the drawer O, while the cinders fall out
of the lower end of the cylinder into a separate drawer P.
For sifting materials which requir to be divided into several qualities according
to the size of the grains or particles I arrange several apparatus constructod as
above described one at a lower level than another and with open work cylinders
of gradually increasing coarseness, and so that the particles which escape at the
lower end of the cylinder of the first apparatus are conducted to the upper end of
the cylinder of the second apparatus, and so on, while the particles which pass
through the sides of the cylinders fall into separate receptacles.
Figures 5 and 6 represent an apparatus composed of 3 cylinders and their con-
nections arranged one above another for the purpose just described. These Figures
will be fully understood without further explanation.
In witness whereof, I, the said James Kemp, have hereunto sot my hand
and seal, this Twenty-fifth day of November One thousand eight hundred
and seventy-six.
J. KEMP. (L.S.)

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