Improvements in Sifting Machinery.
Year: 1893

page_text: Date of Application, 4th Sept., 1893
Complete Specification Left, 2nd June, 1894--Accepted, 7th July, 1894
PROVISIONAL SPECIFICATION.
Improvements in Sifting Machinery.
I, JOHN SMITH, of Grove Iron Works Carshalton, Engineer and Millwright do
hereby declare the nature of this invention to be as follows:-
This invention consists of an ordinary sieve resting on springs. It may be
horizontal or on an incline, & has a to & fro motion by means of a crank or
eccentric, in the usual way.
It is the general practice to suspend a sieve at four or more places, & give it an
oscillating motion.
According to my improvements I suspend a frame, so that it may have an
oscillating motion, & the sieve rests on springs which are supported by the said
frame. By this means the sieve gets both the action due to the oscillation, and a
further action due to the springs.
The sieve may also have a transverse to & fro motion by being actuated by a
side cam.
Or the sieve may be suspended at any desired number of places by spiral or
bow springs, & be oscillated in the ordinary way.
Dated this 4th day of September 1893.
COMPLETE SPECIFICATION.
Improvements in Sifting Machinery.
I, JOHN SMITH of Grove Iron Works Carshalton, Engineer and Millwright,
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:-
This invention consists of a frame which is suspended by one or more strips of
flexible material such as hoopiron, and is attached at one end, to an eccentric or
crank for giving it an oscillating or to and fro motion.
The said frame is fitted with springs and the said springs support a sieve.
The said springs may be spiral and surround certain studs attached to the frame
or may be oval shape like carriage springs or of any other kind. And the said
sieve may be above the frame and rest on the said springs, or may be suspended
beneath the frame, with the springs intervening.
By any of these arrangements the sieve gets both the oscillating or other motion
imparted to the frame, and also a further action due to the springs. The latter
action can be regulated to any desired extent by adjusting the said springs.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a side elevation showing the frame supporting the springs upon which
the sieve rests.
Fig. 2. is a plan showing the frame only.
Figs. 3. 4 & 5 are side elevations showing a frame and sieve with various
arrangements of springs intervening.
Similar letters of reference denote similar parts in the various figures.
In Figs. 1. & 2. A. A. A. is a frame made of iron or other material, and is
caused to travel to and fro by an eccentric or crank A¹.

page_text: B. B. are bolts or studs attached to the frame A. Each stud passes through a
spiral spring B¹ B' and through an angle piece or lug C¹ C¹ secured to the side or
bottom of the sieve C. C. and terminating with a nut B B" for compressing the
said springs to any desired extent.
CC is the sieve to which are attached the angle pieces or lugs C'C' which
rest on the spiral springs B' B'.
D represents part of a stand and D' is a flexible strip or hanger for supporting
the end of the frame A or it may be supported in other convenient manner so as
not to interfere with the to and fro motion.
Fig. 3 shows the frame A. A with bolts or studs B. B extending downwards, the
sieve C. C. being placed beneath the frame A A with spiral springs B¹ B'
intervening.
Figs. 4 & 5 show the frame A A with other forms of springs B¹ B' supporting
the sieve C. C.
Having now particularly described & ascertained the nature of my said inven-
tion & in what manner the same is to be performed, I declare that what I
claim is:
In sifting machinery the introduction of springs between an oscillating frame
& the sieve, constructed & arranged substantially in the manner herein described &
shown in the drawings.
Dated this 29th day of May 1894
JOHN SMITH.