Improvements in Sieving Machinery.
Year: 1889

page_text: Date of Application, 19th Mar., 1889
Complete Specification Left, 13th Dec., 1889-Accepted, 18th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in Sieving Machinery.
I, HENRY SIMON of No. 20 Mount Street, Manchester, in the County of Lancaster,
Civil Engineer, do hereby declare the nature of this invention to be as follows :-
My invention relates to sieving machinery of that kind in which a suspended or
supported sieve is put in motion by a crank or eccentric on a vertical shaft, every part
of the sieve being thus made to travel in a circular path. It has been attempted to
balance the movements of such sieves by driving two, three or more of them from
cranks set at suitable angles to each other on the same shaft, or by attaching to the
shaft in each case a weight opposite to the crank, but, as a sieve or a weight
thus applied does not move in the same plane with the sieve that is to be balanced,
the machinery is subject to the lateral shaking action which results from the
momentum of one of the masses acting at one part of the shaft in the one
direction while the momentum of the other mass acts at another part of the shaft
in the opposite direction. In order to avoid this objection, 1 counterbalance the
sieve by two heavy arms, attached to the crank shaft opposite to the crank, the
one arm above, the other below the sieve, both as close to it as practicable and
as nearly as possible at equal distances above and below the centre of gravity of
the loaded sieve, so that their joint action is in the same plane with that of the
sieve. As a convenient arrangement of sieves balanced in this manner, I mount
the vertical crank shaft with its counterweighting arms in the middle of a suspended
frame carrying two sets of sieves one on each side of the shaft, these sieves being
available for treating material either of the same kind or of two different kinds.
In some cases a sieve is at its one end connected to a crank on a vertical shaft
while its other end is guided to travel approximately in a straight line or in
short circular arc, every part of the sieve being thus made to move in a curve
of oval form. I counterbalance the movements of such a sieve in the mannor
above described by suitable heavy arms attached to the shaft above and below the
crank which drives the sieve. In each case, instead of employing a heavy arm, a
wheel loaded on the side opposite to the crank may be used.
Dated this 19th day of March 1889
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Sieving Machinery.
I, HENRY SIMON, of No. 20 Mount Street, Manchester, in the County of Lancaster,
Civil Engineer, 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 sieving machinery of that kind in which a suspended
or supported sieve is put in motion by a crank or eccentric on a vertical shaft
or several of these every part of the sieve being thus made to travel in a circular
path. It has been attempted to balance the movements of such sieves by driving
two, three or more of them from cranks set at suitable angles to each other on
the same shaft, or by attaching to the shaft in each case a weight opposite to the
crank, but, as a sieve or a weight thus applied does not move in the same plane
with the sieve that is to be balanced, the machinery is subject to the lateral
shaking action which results from the momentum of one of the masses acting at
one part of the shaft in the one direction while the momentum of the other mass
-[-Price 6d=]

page_text: acts at another part of the shaft in the opposite direction. In order to avoid this
objection, I counterbalance the sieve by two heavy arms attached to the crank shaft,
the one arm above, the other below the sieve, both as close to it as convenient and as
nearly as practicable at equal distances above and below the centre of gravity of the
loaded sieve, so that their joint action is in the same plane with that of the sieve.
a convenient arrangement of sieves balanced in this manner, 1 mount the vertical
crank shaft with its counterweighting arms in the middle of a suspended frame
carrying two sets of sieves one on each side of the shaft, these sieves being available for
treating material either of the same kind or of two different kinds.
As
In some cases a sieve is at its one end connected to a crank on a vertical shaft while
its other end is guided to travel approximately in a straight line or in short circular
are, every part of the sieve being thus made to move in a curve of oval form. I
counterbalance the movements of such a sieve in the manner above described by suit-
able heavy arms attached to the shaft above and below the crank which drives the sieve.
In each case, instead of employing a heavy arm, a wheel loaded on the side opposite to
the crank may be used.
Fig. 1 of the accompanying drawings is a sectional elevation and Fig. 2 is a plan of
a pair of sieves worked by a central crank provided with means according to my
invention of balancing the motion of the sieves; Figs. 3 and 4 are similar views of a
single sieve worked by a crank at one end, also provided with means of balancing.
S represents the sieve which is suspended by hangers H in the usual way.. C is the
crank for working the sieve, which crank, as shewn in Figs. 1 and 2, revolves in the
middle space between two sieves rigidly connected together, or, as shown in Figs. 3
and 4 it revolves at one end of the sieve the other end of which is jointed to a radius
arm R pivotted on the framing.
In either case there are fixed on the crank shaft opposite to the crank two suitable
weights W at equal distances above and below the mean plane occupied by the centre
of gravity of the sieve and its load. In the arrangement shewn in Figs. 1 and 2, every
part of the sieve moves in a path circular or approximately circular, its momentum in
each direction being balanced by that of the weights W acting in planes parallel to
the sieve and always opposite in direction to it, so that little or no shake is imposed
on the bearings of the crank shaft or the framing that carries them.
According to the arrangement shewn in Figs. 3 and 4, the end of the sieve next the
crank moves in an approximately circular path, the other end moving in an arc
determined by the radius R, and all intermediate parts of the sieve move in paths of
an oval form, becoming narrower and narrower the farther they are from the crank.
In this case also the weights W act equally in balancing the motion of the sieve,
without shake being imposed on the bearings of the crank shaft and framing.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
In combination with a crank shaft working a sieve in the plane in which the crank
revolves, a pair of balancing weights fixed on the shaft opposito to the crank above and
below the mean plane of the sieve, substantially as and for the purpose set forth.
Dated this 13th day of December 1889.
ABEL & IMRAY,
Agents for the Applicant.