AN IMPROVED SIFTING APPARATUS WITH BLOWING ATTACH- MENT FOR DRESSING COAL, ORES, AND THE LIKE SUBSTANCES
Year: 1878

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent
Solicitors, at Frankfort-on-the-Main, in the Empire of Germany, for the
Invention of "AN IMPROVED SIFTING APPARATUS WITH BLOWING ATTACH-
MENT FOR DRESSING COAL, ORES, AND THE LIKE SUBSTANCES.” A com-
munication from Heinrich Hochstrate, of Zeche, Rheinpreussen, of Homberg-
on-the-Rhine, in the Empire of Germany.
Sealed the 18th February 1879, and dated the 24th August 1878.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 24th August 1878.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Main, in the Empire of Germany. "AN IMPROVED SIFTING
APPARATUS WITH BLOWING ATTACHMENT FOR DRESSING COAL, ORES, AND THE
LIKE SUBSTANCES." [A communication from Heinrich Hochstrate, of Zeche, Rhein-
preussen, of Homberg-on-the-Rhine, in the Empire of Germany.]
This Invention relates to an improved sifting apparatus for dressing coal, ores,
and like substances, the said apparatus being provided with a blowing attach-
ment.
In carrying the said Invention into practice I provide a rotating drum-sieve by
which the material to be sifted is sorted according to its size.
Each size of material falls into a funnel-shaped catcher passing below the said
drum from which it falls into the air-current passing through a canal, the said air-
current being driven by fans, blowers, or by any other suitable apparatus. This
air-current carries all particles of dust into a dust chamber, while the larger and
rounder grains fall on a device herein after called a floor, and roll away into a
funnel. The heaviest or more flat pieces remain on the said floor and are carried
by the same as it moves in the opposite direction to the air-current into a hopper:
D

page_text: This floor consists of chains with metal plates having the same width as that of
the length of the links which are rivetted to the same. With materials, the
heaviest pieces of which are of one form, as for instance slate among coal, the
endless floor is covered with a leather or india-rubber band in which suitable
indentations are made; in this manner the slate is effectually sorted from the
coal as the latter is more rounded in shape, and the former flat.
For each size a canal is provided, each having an endless rotating floor resting
on chain wheels driven from a common axle.
Each air-channel is attached to a frame which rests on the said common axlo
and carry a chain wheel with their axles at their other ends; these frames are
provided with regulating screws by which the incline of the said canals can be
regulated to suit any size of material.
It will also be understood that for each, size a different pressure of air is
required.
A shaking apparatus is placed below each rotating endless floor so that the
material on the same is given a sort of jumping motion.
The aforesaid dust chamber and hoppers are provided with endless screws or
other suitable apparatus to remove the substances deposited in the same. The
said hoppers are each provided with an endless screw, so that it can at once be
seen if the apparatus is properly regulated.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Frank Wirth in the Great Seal Patent Office on the 24th February
1879.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Main, in the Empire of Germany. "AN IMPROVED SIFTING
APPARATUS WITH BLOWING ATTACHMENT FOR DRESSING COAL, ORES, AND THE
LIKE SUBSTANCES." A communication from Heinrich Hochstrate, of Zeche, Rhein-
preussen, of Homberg-on-the-Rhine, in the Empire of Germany.
This Invention relates to an improved sifting apparatus for dressing coal, ores,
and like substances, the said apparatus being provided with a blowing attach-
ment.
according to this Invention.
"PP
Figure 2 is a vertical longitudinal section, and Figure 3 a vertical transverse
section of the same.
Like letters indicate corresponding parts throughout the Drawings.
A is a rotating drum sieve by which the material to be sifted is sorted according
to its size.
Each size of material falls into a funnel-shaped catcher B, arranged below the
said drum, from which it falls, and is acted upon by the air-current passing through
the canal C, said air-current being produced by means of fans or blowers, as shewn
at D, or by any other suitable apparatus. This air-current carries all the particles
of dust into the dust-chamber E, while the larger and rounder grains fall upon the
floor F and roll away into the funnel G. The heaviest or more flat pieces remain
on the said floor F and are carried by the same as it moves in the opposite direc-
tion to the air current into the hopper H. This floor consists of chains with metal
plates which are of the same width as the length of the links which are rivetted
to the same. With materials, the heaviest pieces of which are of one form, as for
instance, slate among coal, the endless floor is covered with a leather or india-
rubber band in which suitable indentations are made; by this means the slate is
effectually sorted from the coal, as the latter is more rounded in shape, and the
former flat.
For each size a canal C, C¹, C³, is provided, each having an endless rotating floor
resting on chain wheels K, K¹, K, driven from a common axle I.
Each air channel is attached to a frame L, the said frames resting on the afore-
said common axle I at their one end, and carrying the chain wheels M, M', M²,
fitted upon axles N, N1, N2, at their other ends; these frames are provided with
regulating screws 0, 0, 0, by which the incline of the said canals Ĉ can be regu-
lated to suit any size of material.
It will also be understood that for each size of material a different pressure of
air is required.
A shaking apparatus P is placed below each rotating endless floor so that the
materials on the same are given a sort of jumping motion.
The aforesaid dust chamber E and hoppers H are provided with endless screws
Q, R, R1, R2, or other suitable apparatus to remove the substances deposited in the
same. The said hoppers H are each provided with an endless screw, so that it can
at once be seen if the apparatus is properly regulated.
Having thus fully described the said Invention and the manner of performing
the same,
I wish it understood that I claim in an improved sifting apparatus fur-

page_text: nished with a blowing attachment, the wind canals furnished with movable floors
and with regulating apparatus in combination with the other parts of the said
apparatus as above set forth, and for the purposes specified.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand and
seal, this Fifteenth day of February, in the year of our Lord One thousand
eight hundred and seventy-nine.