Year: 1886

page_text: Date of Application, 3rd May, 1886.
Complete Left, 3rd Feb., 1887.
Complete Accepted, 4th Mar., 1887.
I, JAMES OLIVER of Wigmore Hall, Luton in the County of Bedford Machinist, do
hereby declare the nature of this invention to be as follows:-
My invention relates to chaff-cutters of that class which are provided with screens
or riddles for separating long and imperfectly cut straws and dust from the chaff.
These screens or riddles are generally composed of two perforated boards or plates
fixed one above another in a frame which is adapted to be oscillated by means of
a crank.
When the machine is in operation the oscillation of this double screen causes a
considerable rocking or shaking of the said machine, owing to the momentum in one or
the other direction.
The object of my invention is to prevent this rocking or shaking of the machine,
and to this end it consists essentially in the improvements hereinafter described.
According to my said invention the perforated boards or plates, instead of being
secured in one frame, as hereinbefore described, are each fixed in a separate frame.
These two frames are placed one above another, so that the screens or riddles occupy
substantially the same positions relatively to each other as if they were both secured
in a common frame.
These single screens or riddles are each suspended from the frame of the machine
by rods or links, so that, when the machine is working, one screen can be swung in
one direction and the other in the opposite direction.
By thus causing the screens to swing in opposite directions the momentum of one
screen counterbalances that of the other, whereby all undue rocking or shaking of the
machine, owing to the vibration of the screens or riddles, will be prevented.
The alternate movement of the screens in opposite directions may be produced by
cranks or by any other suitable means.
I prefer to operate both screens from one crank. For this purpose I attach the
connecting rod to a cross-bar on the upper screen, so that the latter is operated
directly by the crank. The lower screen is oscillated by two bars or rods which
connect the upper screen with the upper ends of two levers, pivotted, at or near the
centre, to the frame of the machine and attached to the lower screen at their
lower ends.
HASELTINE, LAKE & CO...
45. Southampton Buildings, London. W.C..
Agents for the Applicant.

page_text: Improvements in Chaff-cutting Apparatus.
I, JAMES OLIVER, of Wigmore Hall, Luton in the County of Bedford, Machinist
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:
My invention relates to chaff-cutters of that class in which screens or sieves are
employed for separating long and imperfectly cut straws and dust from the chaff.
These screens or sieves are generally fixed one above another, in a frame which is
adapted to be oscillated by means of a crank.
When the chaff-cutter is in operation the oscillation of this double screen causes a
considerable rocking or shaking of the machine, owing to the momentum.
The object of my invention is to prevent this rocking or shaking, and to this end it.
consists essentially in arranging the screens or sieves in such a manner that they can
vibrate simultaneously in opposite directions, so that the momentum of one screen
counteracts or neutralizes the momentum of the other.
In the accompanying drawing,
Figure 1 is a vertical longitudinal section showing the lower part of a chaff-cutter
having the screens or sieves arranged according to my invention.
Figure 2 is a plan of the same.
a is the lower part of the frame of a chaff-cutter and bare the screens or sieves.
The upper screen or sieve is suspended from the said frame by the links ce; and
the lower screen or sieve is suspended below the screen by the links dd.
Motion is communicated to the screen through the medium of the crank shaft
and the connecting rod e', the latter being attached at one end to the crank and at the
other to a cross bar on the said screen. The lower screen is operated from the
screen by means of the rods y' connected at one end to the sieve band at the other
to a bar, . This bar is carried by extensions ii of the links d''.
It will be understood that when the sieve is moved in one direction the
extensions ii are oscillated in the same direction by means of the rods g¹g, and that
consequently the links d' d' will be moved in the opposite.
As the screen is supported at one end upon these links d¹¹ it will be obvious
that when the screen is moved to the right the screen will be moved to the left
and vice versa.
By thus causing the screens to vibrate in opposite directions the momentum of one
screen counterbalances that of the other, whereby all undue rocking or shaking of the
machine owing to the vibration of the said screens will be prevented.
Although have shown both screens as operated from one crank, it is to be
understood that two cranks or any other suitable mechanism may be used for the
purpose.

page_text: Instead of arranging two single screens one above the other as hereinbefore
described, I may employ two double screens. In this case, however, these screens are
arranged side by side and are operated so that they do not move in the same direction
at one time.
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 :—
1st. In a chaff-cutter, the employment of screens arranged to vibrate in opposite
directions, as, and for the purpose, above specified.
2nd. The improved apparatus comprising the screens and the mechanism for
vibrating the same in opposite directions, substantially as described with reference to
the accompanying drawing.