Improvements in Middlings Purifiers used in Flour Mills.
Year: 1892

page_text: Date of Application, 4th June, 1892
Complete Specification Left 4th Mar. 1893-Accented. 29th Apr. 1893
PROVISIONAL SPECIFICATION.
Improvements in Middlings Purifiers used in Flour Mills.
I WILLIAM TAYLOR BATES Fern Villa, Coton Road, Nuneaton, Warwickshire
Mill Manager do hereby declare the nature of this invention to be as follows:-
I divide the ordinary purifier sieve frame into 2 or more longitudinal sections,
thus forming narrow spaces which I cover with silk or other sifting medium. Over
these silk spaces I place specially formed hoods, whole or in longitudinal sections,
and into these hoods I cut, at certain intervals, transverse slots, above which are
flaps or valves which can be opened or closed to regulate the intensity or volume of
the ascending air currents. Under each sifting space I place a catch board, or
tray, which is kept clean by a travelling brush or other suitable device.
This is essentially a description of my invention but I do not bind myself to any
exact form, as it may be necessary to vary the arrangement to suit the varying
materials under treatment.
11
1 .
L T
1000
W. T. BATES.
COMPLETE SPECIFICATION.
Improvements in Middlings Purifiers used in Flour Mills.
I, WILLIAM TAYLOR BATES, of Fern Villa, Coton Road, Nuneaton, Warwick-
shire, Mill Manager, 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 is best described by aid of the accompanying drawings, in
which:-
Figure 1 is a transverse section of the sieve frame and dust catching device;
Figure 2, enlarged view of a portion of the wood and dead part of the sieve;
Figure 3, section through W Z, Figure 1 ;
Figure 4, transverse section.
I divide the ordinary purifier sieve and sieve frame into a series of sections A
and B, alternately pervious and impervious, parts A being preferably formed of
bars of wood. Over the pervious portions, I place hoods C. These hoods are
formed of a succession of plates, preferably metal, formed like a pent house roof,
sloping down to each impervious strip A, and covering the entire pervious portion.
The hoods C are supported on the impervious piece A by bars D, the impervious
parts A, the sides of the frame and the bars D thus forming troughs for the dust
to collect in. The sloping parts C are placed a short distance apart from each
other, this distance varying with the material to be sieved.
The mode of action is as follows:-
The material to be sieved is fed in on to the various short sieves, evenly at one
end by any ordinary feeding device. The upward current of air passes through
the pervious portions B, which are arranged preferably at a slight angle from
the horizontal. As the material, through the shaking of the sieve frame, passes
down to the tail end, the uprising current of air carries the dust through the open
slots in the hood or between the parts of the hood on to the sloping backs of the
hoods, down which it slides to the troughs E, formed of the bars D and the catch
bar A. These troughs can either be made so slanting as to deliver their materials
at the tail, or they can be supplied with travelling brushes or equivalent
devices.

page_text: The above description sets forth my experimental apparatus. It is obvious,
however, that the slots in the hoods can be varied in form, and that the raised
portions G can, if desirable, be placed at both ends, longitudinally, of the pieces of
hood C, and other slight variations of structural details can be made without
in the least changing the principle of my invention. The troughs E can be, for
instance, made of metal, and formed in one with the sloping hoods C. The parts G,
in such case, are formed out of the material which would otherwise have extended
over the slot through which the upward current passes.
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:-
1. The combination of the troughs E, the hood C covering over the sieve between
these troughs, and the slots in or apertures between the parts of these hoods
through which the air and dust can rise.
2. The apparatus for separating the lighter material from the heavier portions
passing through the sieve and for collecting the dust, substantially as herein
described and shown.
1000.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.