Year: 1887

page_text: Date of Application, 17th Jan., 1887
Complete Left, 14th Oct., 1887
Complete Accepted, 15th Nov., 1887
1, CHARLES DENTON ABEL, 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 to be as follows :-
This invention relates to screening or sorting apparatus, in which horizontal screens
have a circular motion imparted to them while always remaining in parallel positions.
With such apparatus it is requisite that the mode of suspension and the guiding of the
screens should be perfectly sure, causing little friction and consequently consuming
but little power. According to the present invention this is effected by suspending
the screen by means of one or more rods the upper ends of which are supported on the
framing by means of heads or collars having a coned bearing surface, the angle of
such coned surface being half the angle formed by the suspension rod when girating
with the screen.
In like manner the lower end of the rod or rods has a collar with a
similarly coned surface on which the eye of the screen frame bears. By these means
the friction of the rod at its points of suspension is entirely converted into a rolling
friction, absorbing very little power.
The screen frame is by preference suspended from a single central suspension rod
arranged as above described, and receives its parallel rotary motion by means
of a crank pin on a vertical driving shaft arranged below it. For guiding the screen,
while it is being rotated, in horizontal and parallel positions it is provided at its
corners with projecting brackets carrying vertical spindles having flat dises at their

page_text: ends that rest lightly at a certain point of their surface upon bluntly pointed studs
carried by the framing, so that as the screen receives its rotary motion, the discs with
their spindles are made to rotate upon the studs as on fixed centres. By this
arrangement the parallel position of the screen is maintained and it is prevented from
tipping to one side when the materials to be screened are charged unequally thereon;
it is also prevented thereby from assuming an inclined position in case its axis of
rotation should not pass through its centre of gravity when at rest. Should further
means be required for insuring the parallel positions of the screen, this may be effected
by connecting the screen by links on opposite sides respectively to the one end of
two double ended levers pivotted to the framing and having their other ends geared
together by toothed segments or other known device for insuring that both levers shall
have the same rocking motion imparted to them.
Dated this 17th day of January 1887
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Screening or Sorting. Ores and
other Materials.
I, CHARLES DENTON ABEL 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 screening or sorting apparatus, in which horizontal screens
have a circular motion imparted to them while always remaining in parallel positions.
With such apparatus it is requisite that the mode of suspension and the guiding of
the screens should be perfectly sure, causing little friction and consequently consuming
but little power while allowing of the required horizontal circular motion. According
to the present invention this is effected as I will proceed to describe with reference
to the accompanying drawing, in which Figs. 1 and 2 shew front and side views of the
machine. Fig. 3 shews a plan, and Figs. 4 and 5 show enlarged details.
The screen A is suspended by a rod S from a point P on the framing B, which also
carries the shaft L for imparting motion to the screen.
This motion is effected in the
well known manner, namely the shaft L, running in bearings carried by the cross
beams M and N of the framing, has a pulley D driven by belt or cord from a motor,
and having an excentric pin Z which gears with a socket in the centre of the underside
of the screen.
The rod S has at each end heads or collars X and Y by which it is connected
respectively to the framing and the screen, and which are formed with coned bearing
surfaces, the angle of which is made accurately equal to half the total angle of deviation
described by the suspension rod of the screen while rotating. By this mode of
suspension all sliding friction at the two points of suspension is avoided, being replaced
by rolling friction.
As shewn at Fig. 4, the angle a of the coned surface is equal to the angle a formed by
the rod S with the vertical centre line, that is, one half the total angle of deviation.
For the purpose of guiding the screen during its rotary motion so as to prevent it
from assuming an inclined position it is provided at its four corners with brackets F
carrying horizontal discs G capable of rotating on their centres, and which bear
lightly upon blunt pointed studs H fixed to the framing, as shewn more clearly at
Fig. 5. Thus on motion being imparted to the screen, the discs G revolve upon the
studs, and at the same time bear any excess of weight that may occur on one side of
the screen owing to unequal loading. They also prevent any angular position of tho
screen owing to its centre of gravity not coinciding with its centre line of suspension.
In ordinary cases, no other means for guiding the screen will be required, but if this
should be found necessary under certain circumstances, it may be effected by means of
the arrangement of parallel motion hh' and kk' indicated at Fig. 3. The sway
beams hh being geared together at one end by toothed segments, &c., and connected
to the screen at the other ends by links k k'.

page_text: 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 :-
-
1. The use in combination with horizontal screens having a parallel rotary motion of
one or moro suspension rods having at the points of suspension coned bearing surfaces
whose angle is equal to half the angle of deviation of the screen, substantially as herein
described.
2. In combination with a rotary screen ▲ suspended by a rod S having coned
bearing surfaces as set forth in the preceding claim, the use of horizontal rotatable
discs G carried by the screen and resting upon fixed studs H substantially as and for
the purposes set forth.
3. In combination with rotary screens arranged and operating as set forth in the
preceding claims, the use of a parallel motion consisting of the geared levers hh¹ and
links k k for maintaining the screen in parallel positions while rotating.
DL:
ABEL & IMRAY,
Agents for the Applicant.