Year: 1888

page_text: 1, JOHN IMRAY of No. 28 Southampton Buildings Chancery Lane in the County of
Middlesex, Consulting Engineer and Patent Agent 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 :-
This invention relates to an improved construction of oscillating screens for sorting
materials such as coal wherein the material to be sorted is first delivered on to a screen
consisting of two sets of inclined bars suspended by rods and having a separate oscil-
lating motion imparted to them by cranks or eccentrics so that the one set moves
relatively to the other, whereby the coarser material is made to travel gradually down
the screen while at the same time the finer material passes through the bars on to a
second inclined screen below, which may either be of bars or of perforated metal and
which also receives an oscillating motion from a crank or eccentric, whereby the
material falling upon it is still further screened, the coarser particles being delivered
from the lower end thereof.
Fig. 1 of the accompanying drawings shews a longitudinal section and Fig. 2 a plan
of the combined screens constructed according to this invention.
The upper screen consists of two sets of bars A A and B B, the set B being situated
between the set these being connected together by transverse bars A A' while the
bars B are connected by transverse bars B'. The set A is connected at their higher
end by extensions A to arms ("C' on the straps of eccentrics CC fixed on a driving
shaft S while the set B is connected by extensions B' to arms D¹ D' on the straps
eccentrics D D. At the lower ends the two sets are suspended from rods E E' that
are made adjustable, in their lengths so as to enable the inclination of the bars to he
adjusted.
of
From this arrangement it will be seen that the rotation of the shaft S will cause
both a rising and falling and a to and fro motion to be imparted to the higher ends of

page_text: the two sets of bars, and as the eccentrics C are fixed in an angular position on the
shaft different from that of the eccentrics D, they will also impart a relative motion to
the two sets of bars, whereby the coal or other material delivered on to them from the
shoot will be effectually shaken up and made to descend towards the lower end,
while the smaller material will pass through the bars on to the screen G below.
This screen, which is of perforated sheet metal and is surrounded on three sides by
a box, is suspended by rods H H at both ends, those at the lower end being also
adjustable in length for the purpose of adjusting the inclination of the screen. This is
connected at the higher end by connecting rods I to a crank S¹ on the shaft S whereby
a rapid oscillating motion is imparted to it.
By this motion the finer material is made to pass through the screen while the
coarser material travels down the screen and is delivered from the lower end thereof.
The three sizes of coal or other material thus obtained are each delivered into a separate
shoot, leading the same to wherever required.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is :-
The combination of an upper screen consisting of two sets of bars having independent
motion imparted to them and a lower screen having an oscillating motion imparted
thereto by cranks or eccentrics whereby the material falling through the upper screen
is sorted into two qualities substantially as herein described.
Dated this 1st day of November 1800
ABEL & IMRAY,
Agents for the Applicant.