Improvements in Screening Coal, Coke and other Materials.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Screening Coal, Coke and other Materials.
I, WILLIAM CUTHBERT BLACKETT, Mining Engineer, of Acorn Close, Sacriston,
in the County of Durham, do hereby declare the nature of this invention to be
as follows:-
My invention relates to the screening of coal, coke and other materials and has
for its object to sort or size the material in a simple manner.
According to the invention I employ a revoluble cylinder having an inlet
at one end and an outlet at the other, and perforated along its length with one,
two or more series or sets of graded holes, and furnished internally with a
travelling or conveying device, all so arranged that as the material enters the
revolving cylinder it is travelled or conveyed along same whereby some of the
material passes through one series of holes, some through another, and so on until
that which has not passed, or is not capable of passing, through the perforations
is discharged at the outlet; thus conveyance and grading or sizing of the material
are obtained by one appliance or apparatus with the consequential economy as
compared with the present plans.
The cylinder may be adapted for use alone, or in combination with another
screen. The latter arrangement is specially applicable for treating coal; and as
the invention has been purposely devised for this service I will describe its
application thereto by way of example.
In such application I adopt a cylinder open at both ends so that one serves
as the inlet and the other as the outlet and I dispose it horizontally or at an
inclination with the inlet in communication with an ordinary jigging or other
screen.
The cylinder is mounted for revolution and is revolved in any appropriate
way or ways which may be various; for example, it may be supported upon
laterally disposed rollers, or by a suitably arranged shaft or shafts, while for
operating it a sprocket or spur wheel may be fixed to it to be driven by con-
venient gear, or the rotation may be accomplished by friction. Adjustable means,
such as screws, may be applied to permit the variation of the position of the
cylinder.
or sets of holes are made at
Along the length of the cylinder series
intervals, the holes of each succeeding set or series being of a larger diameter
than those of the preceding set and the number of sets determined by the dif-
ferent classes of coal required; for instance, if four kinds" best,"" small,"
peas and nuts "are required, then there will be two series or sets of
" nuts"
perforations, one for "small," the other for "peas," the "best" and
being delivered respectively from the jigging or other screen as usual and from
the outlet end of the cylinder.
<
37
"
Within the cylinder and throughout its length I fix or form a projecting ledge,
rib or part or two or more such parts-spiral fashion whose function is to travel
or convey the material along the cylinder during its revolution.

page_text: In operation, as the cylinder revolves, the coal fed to it from the ordinary
screen is travelled or conveyed forward by the spiral ledge or ledges, whereupon
part falls through the first series or set of holes, part through the next, until
finally the residue is discharged at the end of the cylinder.
The cylinder is preferably located so that the coal falls directly from it into
wagons through suitably fitted shoots.
I, WILLIAM CUTHBERT BLACKETT, Mining Engineer, of Acorn Close, Sacriston,
in the County of Durham, do hereby declare the nature of this invention and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:―
My invention relates to the screening of coal, coke and other materials and has
for its object to sort or size the material in a simple manner.
According to the invention I employ a revoluble cylinder having an inlet
at one end and an outlet at the other, and perforated along its length with one,
two or more series or sets of graded holes, and furnished internally with a
travelling or conveying device, all so arranged that as the material enters the
revolving cylinder it is travelled or conveyed along same whereby some of the
material passes through one series of holes, some through another, and so on until
that which has not passed, or is not capable of passing, through the perforations
is discharged at the outlet; thus conveying and grading or sizing of the material
are obtained by one appliance or apparatus with the consequential economy as
compared with the present plans.
The cylinder may be adapted for use alone, or in combination with another
screen. The latter arrangement is specially applicable for treating coal; and as
the invention has been purposely 'devised for this service I will describe its
application thereto by way of example, reference being had to the accompanying
explanatory drawings, whereof Figs. 1 and 2 are sectional elevations illustrating
two convenient working arrangements for such application, and Fig. 3 is an
elevation of the cylinder at the left hand end of Fig. 1.
As will be seen from the drawings, I adopt a metal cylinder A open at both
ends so that one, a, serves as the inlet and the other, a¹, as the outlet, and I
dispose it horizontally or at an inclination, as represented respectively in Figs. 1
and 2, with the inlet a in communication with an ordinary jigging or other
screen, designated B.
The cylinder A is mounted for revolution and is revolved in any appropriate
way or ways which may be various. For example, I have shown it supported
by one or more pairs of laterally disposed rollers C, C, upon which bears a rail a²
secured around the cylinder, and by a shaft D (Fig. 1) or by shafts D, D¹ (Fig. 2)
each shaft being carried by bearing rings d, d fastened within the cylinder, and
by an external bearing, the shaft D being driven by gearing, belting or other-
wise to rotate the cylinder. However, instead of the cylinder being thus operated
a sprocket or spur wheel may be fixed to its exterior to be driven by convenient
gear, or one or all the rollers C, C may be driven.

page_text: As will be obvious, adjustable means, such as screws, may be applied about
the bearings of the rollers C, C, the bearing or where suitable, to permit the
variation of the inclination of the cylinder.
Along the length of the cylinder A series or sets of holes a³, ³ are made at
intervals, the holes of each succeeding set or series being of a larger diameter
than those of the preceding set and the number of sets determined by the dif-
ferent classes of coal required; for instance, if four kinds" best," "small,"
"and
nuts - are required, then, as illustrated, there will be two series
or sets of perforations, one for "small," the other for "peas," the "best" and
"nuts" being delivered respectively from the jigging or other screen B as usual,
and from the outlet a¹ of the cylinder.
peas
Within the cylinder and throughout its length I fix or form in any fitting
manner a projecting metal ledge, rib or part E (Fig. 2) or two or more such
parts E, E (Fig. 1)-spiral fashion, whose function is to travel or convey the
material along the cylinder during its revolution, and thus constitute the travelling
or conveying device before referred to.
When the cylinder A is inclined as shown in Fig. 2, I recommend that the
ledge E (or ledges) be perforated, as indicated, like the cylinder, so that the loss
of screening surface in the latter, consequent on its position, is minimised.
As illustrated, the cylinder is preferably located so that the coal falls or is
discharged directly from it into wagons or where required, through suitably fitted
shoots F, F, F, there being a shoot connecting with each set of holes a³, a³ and
with the outlet . For controlling the outlet of the shoots, the customary
hinged door is furnished, as indicated at f in Fig. 3. In Fig. 1 the delivery is
to wagons G, G, G, and in Fig. 2 it is to wagons G, G and to a cleaning belt H,
of any known construction and arrangement.
In operation, as the cylinder A revolves, the coal fed to it from the ordinary
screen B is travelled or conveyed forward by the spiral ledge E or ledges E, E,
whereupon part falls through the first series or set of holes a³, w³, part through
the next, until finally the residue is discharged at the end a¹ of the cylinder.
Though I have described my invention specially in regard to the screening
of coal, I wish it distinctly understood that it is equally applicable for other
materials of a like nature, the construction and mode of use in all cases being the
same, or practically the same as set forth.
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:-
-
1. The improved apparatus for use in screening coal, coke and other materials,
arranged and operating substantially as hereinbefore described.
2. Apparatus for screening coal, coke and other materials, comprising a
revoluble cylinder having an inlet at one end and an outlet at the other, and
perforated along its length with one, two or more series or sets of graded holes,
and furnished internally with a travelling or conveying device, and means for
rotating the cylinder, all arranged and operating substantially as herein before
described in reference to the accompanying drawings to effect the combined con-
veyance and grading or sizing of the material.
3. In apparatus of the kind referred to, the combination of a revoluble cylinder
having an inlet and an outlet and one or more series or sets of holes along its
length, and a projecting ledge, rib or part, or two or more such parts, (perforated
or not) spirally arranged within the cylinder, substantially as and for the pur-
poses set forth.
4. In screening coal, coke and other materials, the use, in combination with
an ordinary jigging or other screen, of a cylinder having an inlet at one end
and an outlet at the other, and perforated along its length with one, two or more
series or sets of graded holes, and furnished internally with a travelling or con-

page_text: veying device constituted by a projecting spiral ledge, rib or part, or two or more
such parts, and provided with means for mounting and revolving it, all substan-
tially as described and shown in the accompanying drawings.
5. Screening coal, coke and other materials by passing same through an appa-
ratus or appliance constructed and adapted to accomplish the combined conveyance
and grading or sizing of the material, substantially as set forth.
Dated this 28th day of April 1900.
For the Applicant,
J. A. HARVEY,
Chartered Patent Agent,
3, St. Nicholas' Buildings, Newcastle-on-Tyne.