An Improvement in Sieving Apparatus.
Year: 1889

page_text: Date of Application, 26th Sept., 1889
Complete Specification Left, 24th June, 1890-Accepted, 9th Aug., 1890
PROVISIONAL SPECIFICATION.
An Improvement in Sieving Apparatus.
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 means of balancing and steadying the movements of two,
three or more sioves moving in different planes, each of these sieves being suspended
and having a rotary or gyrating motion imparted to it by a crank on a vertical shaft.
When there are two such sieves, the one above the other, 1 set the crank for the one
opposite to that for the other, thus producing at the middle point of the shaft between
the two cranks a swinging action due to the centrifugal forces of the two. sieves. In
order to compensate this and take off the strains resulting from it, I fix on the shaft
above the upper sieve, and below the lower sieve an eccentric load having its centre
of gravity in each case opposite to the crank next to it. These loads by themselves
would produce at the middle part of the shaft a swinging action like that produced
by the two cranks and sieves, but, the strain resulting from the loads being always
opposite to that resulting from the cranks and sieves, the effect on the shaft is the
absence of all swinging strain.
When there are three or more sieves, the cranks and loads are similarly arranged
at such angles that the strains are compensated in a similar manner.
For example, when there are three superposed sieves, I set the three cranks at 120° to
each other, and provide an opposite balance either above or below each of the upper
and lower cranks, and a pair of opposite balances the one above and the other below
the middle crank. When there are four superposed sieves 1 set the cranks for the
highest and lowest opposite to each other providing each with an opposite balance,
and I set the two middle cranks opposite to each other and at right angles to the
highest and lowest, balancing them in like manner.
Dated this 26th day of September 1889.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Sieving Apparatus.
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 means of balancing and steadying the movements of two,
three or more sieves moving in different planes, each of these sieves being suspended
and having a rotary or gyrating motion imparted to it by a crank on a vertical shaft.
When there are two such sieves, the one above the other, I set the crank for the one
opposite to that for the other, thus producing at the middle point of the shaft between
the two cranks a swinging action due to the centrifugal forces of the two sieves. In
order to compensate this and take off the strains resulting from it I fix on the shaft
above the upper sieve, and below the lower sieve an eccentric load having its centre
of gravity in each case opposite to the crank next to it. These loads by themselves
would produce at the middle part of the shaft a swinging action like that produced by
the two cranks and sieves, but, the strain resulting from the loads being always
opposite to that resulting from the cranks and sieves, the effect on the shaft is the
absence of all swinging strain.

page_text: When there are three or moro sieves, the cranks and loads are similarly arranged
at such angles that the strains are compensated in a similar manner.
For example, when there are three superposed sieves, I set the three cranks at 120°
to each other, and provide an opposite balance either above or below each of the
upper and lower cranks, and a pair of opposite balances the one above and the other
below the middle crank. When there are four superposed sieves I set the cranks
for the highest and lowest opposite to each other providing each with an opposite
balance, and set the two middle cranks opposite to each other and at right angles
to the highest and lowest, balancing them in like manner.
Fig. 1 of the accompanying drawings represents in side elevation a pair of sieves,
the one A above the other B, driven by opposite cranks C and on a vertical
shaft E. In order to balance the efforts of those sieves I apply a weight W₁ opposite
to the crank, and a weight W* opposite to the crank C².
Fig. 2 is an elevation and
Fig. 3 is a plan of a crank shaft and counterweights arranged for four superposed
sieves. The counterweights W W W W are placed respectively opposite to the
cranks CC 0° 01.
Fig. 4 is an elevation and
Fig. 5 a plan of a crank shaft and counterweights arranged for three superposed
sieves, the counterweights W W W being respectively opposite to the cranks
Fig. 6 is an elevation and
Fig. 7 a plan shewing a crank shaft for four superposed sieves, the balancing being
effected by two counterweights W W respectively opposite the cranks which
are opposite to each other.
In this case the effect of the intermediate pair of cranks 02 C³, which are
respectively opposite to CC, is to reduce the effect of the latter, rendering necessary
only the two counterweights WW.
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 :-
The herein described method of balancing and steadying the movements of two
three or more superposed sieves, driven by cranks on one vertical shaft, by fixing on
the shaft suitable counterweights opposite to the respective cranks and symmetrically
arranged on the shaft.
Dated this 24th day of June 1890.
ABEL & IMRAY,
Agents for the Applicant.