Year: 1886

page_text: Date of Application, 22nd Oct., 1886.
Complete Left, 22nd July, 1887.
Complete Accepted, 23rd Aug., 1887.
THOMAS SHORE Engineer Albion Works Newcastle Road Hanley Staffordshire, do
hereby declare the nature of this invention to be as follows:-
The frame is constructed of wood and is made various heights as occasion requires,
there is a loose box inside of outer frame, suspended on four springs, which is shaken
by a shaft having eccentric motion attached at the back of frame & driven by belt or
gearing at end of shaft.
THOMAS SHORE,
Hanley.
I, THOMAS SHORE, Engineer, Albion Works, Newcastle Road, Hanley, Staffordshire,
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 :-
The frame is constructed of wood and is made various heights as occasion requires.
There is a loose box inside of outer frame suspended on four springs which is shaken

page_text: by a shaft having eccentric motion attached at the back of frame and driven by belt
or gearing at end of shaft.
In order that the nature of my invention may be fully understood I have hereunto
annexed a sheet of drawings illustrating the same on which Fig. 1 is an isometrical
perspective view of a sifting frame for potters and others constructed according to
this invention and Fig. 2 represents on an enlarged scale the mechanism by which
the vibratory motion of the sieve or loose box is obtained and Fig. 3 is a part of the
driving shaft of the same.
A is the outer frame preferably made rectangular when viewed in plan and con-
sisting of four corner uprights connected together by cross pieces. Within this
outer frame is the loose box or sieve B having a bottom of wire gauze or other
material through which the slip or other substance is required to be sifted. This
box or sieve B is suspended from the top of the outer frame by the four flat
steel springs C1, C2, C3, C4. D is the driving shaft at the back of the outer frame
free to revolve in the bearings d, d and receiving motion by the pulley e. Rapid
vibratory motion is communicated from the revolving shaft D to the sieve B by the
bands FF2 fixed to the latter and passing over guide pulleys f¹, f2 to the eccentric
straps G1, G2 which fit on to two eccentrics h¹, h² turned in the shaft D. 1', I² are
two coiled springs in compression fitting loosely on the guides K1, K2 and tending
to force the box or sieve B away from the guide pulleys f¹, 2 against the pull on
the bands F1, F2. I find that a travel to and fro of the sieve of half an inch works
very well in practice and a speed of about 400 revolutions of the driving shaft D
per minute, but 1 do not limit myself to any particular travel or speed.
When the driving shaft D revolving the motion of the eccentrics h¹, h² is com-
municated through the eccentric straps G1, G2 and the bands F1, F2 to the suspended
sieve or box B which is alternately pulled towards the pulleys f¹, 2 (thus further
compressing the coiled springs II) and allowed by the expansion of the springs I³, 12
to recede from the pulleys f¹, f2 so as to obtain a rapid vibratory motion of the sieve
or box B which contains the slip or other material to be sifted.
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. The improved sifting frame for potters and others herein before described and
illustrated by the accompanying drawing, consisting essentially of the suspended box
or sieve B arranged to receive vibratory motion from a revolving shaft by the two
bands F, F which pull the sieve in one direction and the coiled springs I¹, I² which
push the sieve in the opposite direction as hereinbefore described.
2nd. The combination with the box or sieve B suspended as described, of the
bands F1 F2, guide pulleys ff2, eccentrics h¹ h², eccentric straps G1 G2, and coiled
springs 1 12, all arranged and operating substantially as and for the purpose
hereinbefore described and illustrated by the accompanying drawing.
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