Year: 1885

page_text: I DAVID HEARN of Bury St Edmunds in the County of Suffolk, Engineer do
hereby declare the nature of this invention to be as follows:-
+
The present invention relates to improvements in self-acting and self-cleaning
corn screens, of the pattern known as Boby's Patent self-acting and self-cleaning
corn screen, which is a modification of the screen described in the specification filed
in connection with the patent of Robert Boby dated March 14th 1871,,No: 676-
In this screen, the grain is delivered from the feed hopper onto a driving barrel or
bucket wheel, and thence to a wire grid reciprocated from a crank in connection
with the bucket wheel through link rods pivotted to the middle of its length.
The invention has for its object the more efficient operation of the screening
apparatus, and the more advantageous arrangement of the working parts.
J.
In carrying out my invention, I place a separator, capable of adjustment at any
required incline, between the feed hopper and the driving, barrel or bucket wheel.
This separator can be used with or without motion, and is intended to arrest stones
and other large foreign bodies, and throw them aside into a bag provided to receive
them outside the screen.-The grid or wire bed, situated beneath the bucket wheel,
is carried upon wheels or runners which travel within bracket bearers, preferably
of cast iron, mounted upon the inner sides of the wooden case or framing of the
screen.
By this arrangement, the runners are concealed from view, and protected from
accidental damage or derangement.
Reciprocating motion is communicated to the grid from the bucket wheel shaft
by means of a crank thereon, and connecting rods pivotted to the upper end of
the grid.
!

page_text: Fig. 3 a back view.
A is the feed hopper, between which and the bucket wheel or driving barrel B
is situated the vertically adjustable separator C. This separator is pivotted at its
upper end to the framing of the apparatus, and its lower end is capable of being
raised or lowered, and secured at any desired incline by means of the screw and
nut c c¹.
The separator C is so placed beneath the hopper A, that all the grain falling
therefrom, when the door a is opened by means of the rod a', shall pass through
the said separator on its way to the bucket wheel B, and all stones and such foreign
bodies shall thus be intercepted.
These intercepted stones roll down the inclined separator C, and are, if necessary,
retarded in their course (to allow of the escape of grain, which might otherwise be
carried with them) by means of pieces of sacking or other similar fabric hanging
vertically across the separator (see Fig. 2).
From the separator C, the stones fall upon a grid C', also inclined, along which
they roll, and eventually drop into the bag D provided to receive them. D₁ is a
smaller bag for receiving finer particles which have passed through the grid C¹.
The partially cleaned grain meanwhile passing through the separator C, falls
upon the bucket wheel B, to which it communicates rotary motion, and thence is
delivered to the inclined table e leading to the wire grid E, for thorough cleaning,
in the manner which is well understood.
The rotary motion given to the bucket wheel by the falling grain communicates
a reciprocating movement, through a crank b, link rods 61, rock levers 62, and
connecting rods 63 64, to frames F F mounted and sliding in slotted guides G,
which are bolted to the wood framing of the grid, and receive the ends of the trans-

page_text: verse rods f, which project at opposite sides of the frames F F. The transverse
rods ff and f¹f with which the frames F F are provided carry the clearers ƒ³,
by means of which, the grid E is kept clear in the manner explained in the
specification of the patent granted to Robert Boby dated March 14th 1871, No 676.
It will be understood that the removal of stones and similar large bodies from
among the grain, as above described, before it is submitted for treatment by the
screening apparatus, will be a great advantage, as much damage to the parts will
be avoided, and their even and efficient action will not be interfered with. At the
same time, the working parts, being disposed in the manner shewn within the
framing, will not be liable to derangement from external causes.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. In bucket wheel corn screens, providing for the separation and removal of
stones and similar foreign bodies from the grain, before the latter is submitted to
the screening operation, in the manner shown and described with reference to the
drawing, and for the purpose set forth.
2. Constructing and arranging the working parts of bucket wheel corn screens
within the framing, substantially as herein described and shewn in the drawing, so
that they may be protected from external injury and consequent derangement.
Dated this 24th day of Santambor 1886
NEWTON & SON,
Agents for the Applicant.