IMPROVEMENTS IN THE MEANS OR APPARATUS FOR SCREENING COAL
Year: 1884

page_text: I JOHN SHAW of Darrington Hall nr Pontefract in the County of York, Colliery
Proprietor do hereby declare the nature of said invention for "IMPROVEMENTS IN
THE MEANS OR APPARATUS FOR SCREENING COAL" to be as follows:-
=
The object of my invention is to provide an arrangement for screening coal
which operates in such a manner as to perfectly, screen the coal (ie to separate
the larger parts from the smaller) without the risk of crushing breaking or
damaging the lumps.
The framework of the screen may be placed on the same incline as is usual for
ordinary coal screens. Over each screen and in such a position as may be most
convenient for receiving the coal, I provide a travelling grate or grates each of
which is constructed as follows. In suitable bearings and at a convenient distance
apart and running parallel with each other I mount two pairs of pulleys. Over
each pair I pass an endless chain or belt and on these chains or belts and trans-
versely with the screen I attach any required number of angle-iron bars. These
bars project upwards and as they travel forwards form scrapers drawing away the
coal from beneath the heap (formed as the coal is tipped on to the upper part of
the screen). The scrapers carry the large coal along the travelling grate over the
screen or "dead" plate (such dead plate being beneath the scrapers .and on to
lower part of the screen from which it passes into the wagon or other receptacle.
By this mode of carrying forward the coal a regular and even delivery is effected
at the delivering point of the scrapers on to the lower screen. By such means a
more effectual screening of the coal is effected than by the systems now in use.

page_text: .
COMPLETE SPECIFICATION.
I, JOHN SHAW of Darrington Hall, near Pontefract in the County of York,
Colliery Proprietor, do hereby declare the nature of said invention for "IMPROVE-
MENTS IN THE. MEANS OR APPARATUS FOR SCREENING COAL" and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:—
The object of my invention. is to provide an arrangement for screening coal
which operates in such a manner as to perfectly screen the coal (ie to separate the
large parts from the smaller without the risk of crushing, breaking or damaging
the lumps.
And in order that my invention may be more completely understood reference
is given to the accompanying drawings and to the letters and marks thereon.
DESCRIPTION OF DRAWINGS.
Fig 1 is a sectional elevation and Fig 2 a plan looking on the top shewing my
improvements.
The framework a of the screen may be placed on the same incline as is usual
for ordinary coal screens. Over each screen and in such a position as may be most
convenient for receiving the coal I provide a travelling grate or grates each of
which is constructed as follows.
In suitable bearings b and at a convenient distance apart and running parallel
with each other I mount two pairs of pulleys c and d. Over each pair I pass an
endless chain or belt e and f and on these chains or belts and transversely with
the screen I attach any required number of angle or other iron bars g. These
bars g project upwards and as they travel forwards form scrapers, drawing away
the coal from beneath the heap (formed as the coal is tipped on to the upper part
of the screen). The scrapers g carry the large coal along the travelling grate over
the screen or dead plate (such dead plate being beneath the scrapers) and on to
lower part of the screen i from which it passes into the wagon or other receptacle.
By this mode of carrying forward the coal a regular and even delivery is
effected at the delivering point j of the scrapers g on to the lower screen i By
such means a more effectual screening of the coal is effected than by the systems
now in use. Motion is imparted through shaft k.
Having now particularly described the nature of my said invention and in what
manner the same is to be performed I declare that what I claim is
The employment of travelling grate or grates for the purpose of perfectly
screening or separating the larger coal from the smaller substantially as herein set
forth.
The combination of a travelling grate or grates with coal screens arranged and
applied substantially as herein set forth.
DL117
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