An improved Screen for Winnowers and other· Machines for Cleaning Grain.
Year: 1885

page_text: An improved Screen for Winnowers and other· Machines for
Cleaning Grain.
"
I, CHARLES HAYWARD of Pine Lodge, near Shepparton, in the Colony of Victoria,
Farmer, do hereby declare the nature of my invention for "AN IMPROVED SCREEN
FOR WINNOWERS AND OTHER MACHINES FOR CLEANING GRAIN and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:—
This invention has been designed for the purpose of providing a screen for
winnowers and other grain cleaning machines which will allow the grain to fall
through it on to the shaking riddles while the straw and waste is carried over it.
It is made in the form of a louvre frame, either wood or metal, and is placed
immediately above the riddles or attached to the riddle frame so that when the
material to be winnowed is fed on to it from the hopper, and is subjected to the
action of the fanners the grain strikes against the louvres and falls by gravity
between them, while the straw and other larger and lighter materials are blown
over it.
The screen consists of a number of louvres each having one or more pins,
but by preference two at each end. The upper one of these pins is centred in the
top half of a divided frame, while the lower one is centred in the lower half, so
that by lowering the one half of the frame from the other, the width of the spaces
between the louvres is increased. The screen is placed so that the louvres fall
towards the fanners. I also provide means for securing the frames in the several
positions to alter the width of the spaces between the louvres by centring a slotted
plate to the top frame, and securing it when desired to the lower by means of a
thumb screw.
Referring to my drawings,
Figure 1 is a plan of my improved screen.
Figure 2 is a longitudinal section of it looking from the line a. a. Figure 1.
Figure 3 is a similar view of it, but shewing the louvres in their altered position.
Figure 4 is an end view of it, and
Figure 5 is a side view of one of the louvres.
In these Figures A. A are the louvres shewn constructed of metal, and A' are the
proiecting pins at their ends the upper ones of which are centred in the holes in

page_text: the cross bars forming the ends of the top frame, and C, C, are the slides secured
to the side of the frame for supporting it in the side cheeks of a riddle. D is a
slotted plate centred at D¹ to the top frame, and D2 the thumb screw, the pin of
which passes through said slotted plate and through the lower frame B¹. E are
arrows denoting the course of the material which is fed to the screen.
The mode of altering the angles of the louvres so as to increase the width of the
spaces between them is simply to press down the lower frame B¹ which causes the
louvres to descend with it from the position shewn in Figure 2 to that shewn in
Figure 3 and when they are at the desired position they are secured thereat by
means of the thumb screw D.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
My improved screen for winnowers and other machines for cleaning grain
consisting essentially of a series of movable louvres made either of wood or metal,
having preferably two pins at each end centred in a frame, which by preference is.
divided so as to admit of its adjustment in order to alter the angle of the louvres
substantially as herein described and explained and as illustrated in my drawings.
Dated this twenty-first day of October One thousand eight hundred and
aighty-five