Improvements in Screens for Coal, Coke, and other Minerals or Materials, and in Appliances connected therewith.
Year: 1893

page_text: Date of Application, 4th Feb., 1893
Complete Specification Left, 25th Oct., 1893-Accepted, 25th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Screens for Coal, Coke, and other Minerals or
Materials, and in Appliances connected therewith.
I, WILLIAM HENRY CHAMBERS of "The Dale," Conisborough, near Rother-
ham, in the County of York, Mining Engineer, do hereby declare the nature of
my invention for "IMPROVEMENTS IN SCREENS FOR COAL, COKE AND OTHER
MINERALS OR MATERIALS AND IN APPLIANCES CONNECTED THEREWITH
be as follows :-
"
to
My invention has for its object the cleaning, sorting and separation, into different
sizes, by screening; of coal, coke and other minerals or material and my improve-
ments consist of a screen constructed of a series of metal bars, either built up, or
cast with spaces or meshes of the required size enclosed in a frame.
These bars have imparted to them, by means of suitable gearing, a vertical and
a horizontal motion, preferably by means of a revolving shaft, driving eccentrics,
actuating rods coupled with the bars direct, or by means of cross shafts and rods
actuating levers carrying other cross shafts with pins thereon working in recesses,
or with joints underneath the screen bars.
The action of the screen is, that each alternate bar rises, moves forward, falls,.
and recedes whilst the others follow the same course oppositely; that is, when one
set of bars fall and move backwards the other set rise and move forward in
reciprocation so as to continuously, or nearly so, carry the material over and at the
same time so disturbing it, as to let such pieces and dust as may, fall through the
meshes.
The screen may either work in a horizontal position or inclined at different
gradients to suit the material passed over and through the screen.
Dated this 3rd day of February 1893.
R. HEBER RADFORD,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Screens for Coal, Coke, and other Minerals or
Materials, and in Appliances connected therewith.
I, WILLIAM HENRY CHAMBERS of "The Dale," Conisborough, near Rother
ham, in the County of York, Mining Engineer, do hereby declare the nature of
my said 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 has for its object the cleaning, sorting and separation, into different
sizes, by screening, of coal, coke, and other minerals or material and my improve-
ments consist of a screen constructed of a series of metal bars, either built up, or
cast with spaces or meshes of the required size enclosed in a frame.
These bars have imparted to them, by means of suitable gearing, a vertical and
a horizontal motion, preferably by means of a revolving shaft driving eccentrics,
actuating rods coupled with the bars direct, or by means of cross shafts and rods
actuating levers carrying other cross shafts with pins thereon working in recesses,
or with joints underneath the screen bars.
The action of the screen is, that each alternate bar rises, moves forward, falls,
and recedes whilst the others follow the same course oppositely; that is, when one
set of bars fall and move backwards the other set rise and move forward in recipro-
cation so as to continuously or nearly so carry the material over and at the same
Price 8d1

page_text: time so disturbing it, as to let such pieces and dust as may, fall through the
meshes.
The screen may either work in a horizontal line or be inclined at different
gradients to suit the material passed over and through it.
The nature of my invention will be better understood on reference to the accom-
panying sheet of drawings which illustrates one length of screen ten bars wide with
appliances arranged to work in a horizontal line.
Fig. 1. is a side elevation of one length of screen bars with the gearing for
imparting motion to the same,
Fig. 2. being-a plan and
Fig. 3. a cross section of one half the screen taken on the line A. B:
Figs. 4, 5 and 6, are an enlarged longitudinal section, cross section and plan of a
portion of a screen bar shewing the method of construction when the same is built
up of malleable metal,
Figs. 7 and 8, being an enlarged elevation and plan of one of the crossheads on
which every other screen bar is carried and actuated.
The same letters refer to similar parts throughout the several views.
a, a, are the screen bars.
b, b, are the distance pieces by which the bars are rivetted together.
c, c, are the socket blocks also rivetted between the screen bars into which the:
carrying pins d, d, are fitted.
e, e, and e', el, are the crossheads which carry the pins d, d.
ff, are tee bobs or tumblers by the movement of which a rising and falling
motion is communicated to the screen bars through the crossheads e, e, and e', e¹
and the pins d, d, herein previously referred to.
9, 9, are connecting rods by which the tee bobs or tumblers are worked in
unison.
h, h, are eccentric rods by which the motion of the eccentrics is communicated to
the tee bobs or tumblers f. f.
i, i, are rocking levers and
j and are crossheads through which the motion of the rocking levers i, i, is
communicated by the connecting rods k, k, to every alternate screen bar in
succession.
1, 1, are the eccentric rods which communicate the motion of the eccentrics to
the rocking levers, i, i.
m, is the eccentric shaft and
n, the driving pulley or wheel.
On reference to the drawing it will be seen that the forward crossheads, e, e,
actuate the movements of five of the screen bars in a downward and upward
direction whilst the aftermost crossheads e¹, e¹, actuate the five alternate bars in an
upward and downward direction and so on alternately with every stroke of the
machine; it will also be seen that the uppermost crosshead j, actuates five of the
screen bars a; a, backwards and forwards whilst the lowermost crosshead j' actuates
the five alternate screen bars forwards and backwards and so on alternately and in
this way the action of the screen as already described, is obtained, viz. that each
alternate bar rises, moves forward, falls and recedes whilst the others follow the
same course oppositely, that is when one set of bars fall and move backwards, the
other set rise and move forward in reciprocation.
Having now particularly described and ascertained the nature of my inven
tion and in what manner the same is to be performed I declare that what I
claim is,
1. In screens for screening coal, coke and other minerals or material, the
arrangement and combination of parts and appliances comprising the separately
constructed screen bars grouped in sets or lengths of any convenient number in
width and actuated so that each and every alternate bar rises, moves forward, falls
and recedes whilst each and every other alternate bar falls, recedes, rises and

page_text: then advances in the manner and for the purposes substantially as herein described
and illustrated.
Dated this 21st day of October 1893
R. HEBER RADFORD,
Agent for the Applicant.