An Improved Apparatus for Screening and Conveying Coal.
Year: 1896

page_text: PROVISION AL SPECIFICATION.
An Improved Apparatus for Screening and Conveying Coal.
We, HENRY CLARK and JUSTUS MAGNUS RINGQUIST, Draughtsmen, both of the
Teesdale Iron Works, Thornaby-on-Tees, in the County of York, do hereby declare
the nature of this invention to be as follows:-
This Invention relates to apparatus which by its construction and action is
adapted for the purpose of screening coals, and for conveying coals from one position
to another, both of which operations may be carried on simultaneously.
The screening bed of the apparatus is preferably set to an incline, but differs from
the ordinary screening in the following respects. Instead of one continuous screen
operated on the jigger principle we make up the screening bed of a series of plates,
it being understood that by the term plate we include perforated plates, gridiron
screens, or screening plates generally including wire mesh so far as their action and
effect is equivalent to these, and each such screening plate constitutes a section of the
screening bed which has its own separate rocking motion, but acting in combination
with all the other sections of the machine.
To effect this in the manner required for the purposes of our invention each
section is pivotally mounted between the walls or sides of the apparatus and all.
working parallel but alternately inclined and horizontal. Each section is connected
endwise by a hinged joint to each adjoining section. By imparting a rocking motion
to anyone of the said sections it will be seen that all the other sections must share
the rocking motion, the general effect of which is to present a series of elevations
and corresponding depressions over which the coal is caused to travel as by the
jigging process. But instead of attaining a straight run down as on the ordinary
screen with a continuous incline, the descent is interrupted by the constantly
changing series of elevations and depressions due to the separate movements of the
several sections of the screening bed. The screen may be operated by any suitable
means which will vary according to circumstances and need not be described.
The special advantages of the construction hereinbefore described are, that the
motion is applied to several sections of the screen plates instead of to the whole screen
which is generally of great weight; thus much strain and vibration on the structure
is avoided and less driving power required to work the apparatus. The coals are
evenly distributed over the screening area and the mass as charged into the apparatus
is thoroughly screened, but with less breakage as compared with a straight run down
as the charge of coals cannot acquire the same velocity in passing down the screening
bed. The height required for this screen as compared with the fixed or jigging
screens of same area, is very much less.
Dated this 26th day of October 1900
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees,
Agent for the Applicants.

page_text: An Improved Apparatus for Screening and Conveying Coal.
We, HENRY CLARK and JUSTUS MAGNUS RINGQUIST, both of the Tuesdale Iron
Works, Thornaby-on-Tees, in the County of York, Draughtsmen, do hereby declare
the nature of this invention and in what manner the same is to he performed,
to be particularly described and ascertained in and by the following statement:-
This Invention relates to apparatus which by its construction and action is adapted
for the purpose of screening, conveying and cleaning coals or other minerals.
The screening bed of the apparatus is preferably set to an incline, but differs from
the ordinary screens in the following respects:-Instead of one continuous screen we
make up the screening bed of a series of plates, it being understood that by the
term "plate" we include perforated plates, gridiron bars or wire mesh, so far as their
action and effect is equivalent to these and each such screening plate constitutes a
section of the screening hed, which has its own separate rocking motion but acting
in combination with all the other sections of the machine.
And in order that our invention may be clearly understood and readily carried into
effect we will now proceed to describe the same with reference to the accompanying
drawings, in which
Fig. 1 is a sectional elevation of a screen constructed according to our invention.
Fig. 2 is an enlarged sectional view showing portion of the screening bed arranged
for bars and
Fig. 3 is a similar view showing the screening bed arranged for plates.
a represents the plates each of which is mounted between the walls or sides b of
the screen on trunnions c. These plates are hinged at their ends to one another and
are set in motion or rocked by cranks or eccentrics from one inclination to another
thus gradually discharging the coals from the screen. The screens may be operated
by any suitable means which will vary according to circumstances, the means
illustrated by way of example consisting of cranks d, connecting rods e and
eccentrics operated from the driving shaft g of an engine. By imparting a rocking
motion to one of the "plates" a all the other plates share the said rocking motion,
and the general effect is to present a series of alternating levels and inclines or
alternately an angle on which the coal will slide and an angle on which it will not
slide, by which means the coal is caused to travel evenly over the screen, and instead
of attaining a straight run down as in the ordinary jigging and fixed screens with a
continuous incline, the descent is interrupted by the constant changing of the
"plates" from the horizontal or nearly horizontal to the inclined position and
vice-versâ as clearly illustrated by the full and dotted lines in Figs. 2 and 3. In the
case of using bars for the screening bed we propose placing them so that the bars
and spaces alternate on each section of the bed.
The special advantages of the construction herein before described are that
instead of shaking the whole screen, the "plates" are moved, and 'as these "plates"
are on trunnions the whole is balanced, hence considerably less power is required to
work the apparatus and little or no vibration is caused to the structure.
The coals are evenly distributed over the screening area and the mass charged into
the apparatus is thoroughly screened and without breakage as the coals cannot acquire
any velocity.

page_text: The height required for this screen as compared with fixed or jigging screens of
the same area is very much less.
Having now particularly described and ascertained the nature
invention, and in what manner the same is to be perforined, we declare that what we
claim is :-
1. An apparatus for screening coal or other minerals in which the screening bed
instead of consisting of one continuous frame or screen is made up of sections mounted
and rocked each on its own trunnions, the said sections being hinged together
edgewise, so as to present when in motion a series of levels and inclines over which
the coal is caused to travel in the process of being screened, substantially as
hereinbefore described with reference to the accompanying drawings.
2. The general combination of parts constituting the apparatus as a whole, arranged,
constructed and effecting its purpose substantially in the manner hereinbefore
described.
ינים
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees and Hull,
Agent for the Applicants.
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees and Hull,
Agent for the Applicants.