Improvements in Purifiers employed in Milling.
Year: 1891

page_text: Date of Application, 16th May, 1891
Complete Specification Left, 15th Feb., 1892-Accepted, 19th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in Purifiers employed in Milling.
We, HENRY JAMESON DAVIS of 82 Mark Lane, London, E.C., Milling
Engineer, GEORGE BRIGGS FEARNLEY of 138 Dodworth Road, Barnsley in the
County of York, WILLIAM ALLEN of 4 South Street, Dodworth Road, Barnsley
aforesaid, and WILLIAM HOLLAND of 6 Station Road, Summer Lane, Barnsley
aforesaid, Engineers, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object improvements in purifiers employed in milling.
In the Specification of a former Patent granted to the said Henry Jameson
Davis No. 1200 in the year 1889 there described a purifier in which
there is a moving sieve with a surface of silk along which the material
travels. In this purifier over the silk there is arranged a stationary cover of
peculiar construction; it consists of transverse V form bars, and plates of metal are
fixed to the sides of the bars. The arrangement is such that air rising through the
silk sieve ascends between the bars, the currents gaining velocity as the area of the
passages decreases. Thus any dust raised by the air is caused to be carried with
certainty above the bars where in due course it is deposited.
Heretofore however no mechanism has been provided in the cover for controlling
We have now found however that the
the quantity of air passing up through it.
air currents may be very efficiently regulated by appliances upon the cover.
Sometimes we hinge the upper part of one of the side plates of each V form bar.
The plate so hinged extends higher than the adjacent plate on the next bar and by
turning it on the hinge the orifice between the two plates can be increased or
diminished in width. The hinged flaps are connected together in sets by a
connecting rod so that they can be moved simultaneously and held in any required
position.
By suitable adjustment of the flaps a uniform distribution of the air over the
surface of the sieve may be obtained notwithstanding variations in the gauge of the
silk and in the quantity of material upon it in different parts.
According to another arrangement we effect the same object as follows:-We
make cach alternate V shaped bar deeper than the others and we provide means
whereby the height of the latter can be varied relatively to the deeper bars and
thus adjust the space between the bars.
قصد
1
a. 1001
CARPMAEL & Co.,
Agents for the Applicants.
COMPLETE SPECIFICATION. *
Improvements in Purifiers employed in Milling.
We, HENRY JAMESON DAVIS, of 82 Mark Lane, London E.C., Milling
Engineer, GEORGE BRIGGS FEARNLEY of 138 Dodworth Road, Barnsley in the
County of York, WILLIAM ALLEN, of 4 South Street, Dodworth Road, Barnsley
aforesaid, and WILLIAM HOLLAND of 6.Station Road, Summer Lane, Barnsley
aforesaid, Engineers, 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 has for its object improvements in purifiers employed in milling.
In the Specification of a former Patent granted to the said Henry Jameson

page_text: Davis No. 1200 in the year 1889 there is described a purifier in which there is a
moving sieve with a surface of silk along which the material travels. In this
purifier over the silk. there is arranged a stationary cover of peculiar construction;
it consists of transverse V form bars, and plates of metal are fixed to the sides of
the bars. The arrangement is such that air rising through the silk sieve ascends
between the bars, the currents gaining velocity as the area of the passages decreases.
Thus any dust raised by the air is caused to be carried with certainty above the
bars where in due course it is deposited.
Heretofore however no mechanism has been provided in the cover for controlling
the quantity of air passing up through it. We have now found however that the
air currents may be very efficiently regulated by appliances upon the cover.
Sometimes we hinge the upper part of one of the side plates of each V form bar.
The plate so hinged extends higher than the adjacent plate on the next bar and by
turning it on the hinge the orifice between the two plates can be increased or
diminished in width. The hinged flaps are connected together in sets by a
connecting rod so that they can be moved simultaneously and held in any required
position.
By suitable adjustment of the flaps a uniform distribution of the air over the
surface of the sieve may be obtained notwithstanding variations in the gauge of the
silk and in the quantity of material upon it in different parts.
According to another arrangement we effect the same object as follows:-We
make each alternate V shaped bar deeper than the others and we provide means
whereby the height of the latter can be varied relatively to the deeper bars and thus
adjust the space between the bars.
In order that our said invention may be fully understood and readily carried into
effect we will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal and vertical section of a purifier constructed in accord-
ance with our invention with hinged flaps upon the cover to regulate the ascent of
air between its bars or collecting troughs.
Figure 2 is a transverse vertical section of the same.
Figure 3 is a side elevation to a larger scale of a part of the cover.
Figure 4 is a transverse section of the same.
Figure 5 is a side elevation of a part of a cover constructed in accordance with
that part of the invention in which the bars or collecting troughs are adjustable in
relation the one to the other.
Figure 6 is a transverse section of the cover shewn in Figure 5.
a is the frame of the sieve and a¹ is the inclined silk surface thereof a² is a feed
trough at its upper end which receives the meal from a conductor a³. The sieve
has a jogging motion given to it in the usual way and the material is delivered out
of the feed trough and passes along the silk from the upper towards the lower end.
The silk is of various gauges so that the ground material which falls through is
sorted into sizes. Any that may be too large passes off at the end of the sieve and
the light dust is carried upwards off the silk by a current of air induced by a fan
and passing through the silk from below upwards into the closed chamber / above
it.
ccc are the bars of the cover, they are triangular in section and are connected
together to form a frame by the side bars c. This cover is stationary and is
supported from the walls of the chamber . Each bar e has two plates of thin
metal fixed to its sides and projecting above the top of the bar so as to form a
collecting trough for the deposit of the material carried up by the air current
between the bars. Each bar has also a flap connected to one of the side plates c
and projecting up above the edge of the adjacent side plate. The flaps are all-
controlled by a connecting rod d. A pin projecting from each, flap enters a
perforation in the connecting rod d and the position of the rod can be adjusted in a
longitudinal direction by a screw and nut d¹ the rod being arranged to slide through

page_text: 9gare brushes
stationary brackets e one of which is shown in Figures 2 and 3.
connected together into an endless chain; as they travel round the brushes clear
away the material deposited upon the tops of the bars c and sweeps it into one of
the channels a. The channels a' are part of the frame which carries the sieve and
partake of its movement; the material consequently travels along the channels and
is delivered at the lower end.
In Figures 5 and 6 the bars are divided into two sets h and i. The bars h are
fixed upon side bars h¹ h' whilst the bars i are furnished with projecting pinsa
which project into holes in the side rods kk. The side rods k k are connected with
the walls of the chamber 6 by attachments which admit of their adjustment up or
down.
Thus by either of the arrangements shown, the dimensions of the air passages
between the bars are adjusted and the force of the blast may be regulated as
observation of the working of the apparatus may show to be expedient.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. In purifiers in which the lighter particles of the meal are removed from the
sieve and deposited upon a cover by air passing up through the sieve and between
the bars of a cover; hinged flaps upon the bars controlling the dimensions of the
air passages between the bars substantially as described.
2. In purifiers in which the lighter particles of the meal are removed from the
screen and deposited upon a cover by air passing up through the sieve and between
the bars of a cover; so arranging that the alternate bars are moveable in such
manner as to control the dimensions of the air passages between the bars substan-
tially as described.
3. Purifiers with collecting covers over the sieve so constructed that the air
passages between the bars or collecting troughs of the cover may be varied in width
by means substantially as described.
Dated this 2nd dow of Bohmiany 1802
H. JAMESON DAVIS.
GEO. B. FEARNLEY.
WILLIAM ALLEN.
W. HOLLAND.