Improvements in Brushing Rotary Sieves and Trays.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Brushing Rotary Sieves and Trays.
I, JAMES HIGGINBOTTOM, of 32, Seel Street, Liverpool, in the County of
Lancaster, Milling Engineer, do hereby declare the nature of this invention
to be as follows:-
or
to
I
In carrying out my invention I make a brush carrying frame preferably of a
circular form in plan and on
side of this frame
each
attach
on the upper
one or more brushes, such brushes may be fixed
surface of the frame to sweep the underside of the sieve, or they may be fixed
to the underside of the frame to sweep the upper surfaces of the sieve or to sweep
the upper surface of a collecting tray placed below the sieve.
To propel the brush carrying frame with its attached brushes, I make the
exterior diameter or dimensions of the frame of a size a little less than the
interior diameter or dimensions of the outer sieve box or frame which carries the
sieves and trays, and I carry the brush carrying frame by means of supporting
carriers in such manner as will allow the brush carrying frame to move hori-
zontally or freely in any direction so that the action of the rotating sieve box
causes the brush carrying frame to impinge against the interior of the box,
thus a blow or impact takes place between the interior of the sieve box and the
exterior of the brush carrying frame which causes the latter to revolve and
thereby the brushes sweep the sieve and tray surfaces.
The rate of the revolution or movement of the brush carrying frame is regulated
by the difference between the internal diameter of the sieve box and the external
diameter of the brush carrying frame.
Improvements in Brushing Rotary Sieves and Trays.
1, JAMES HIGGINBOTTOM, of 32, Seel Street, Liverpool, in the County of
Lancaster, Milling Engineer, do hereby declare the nature of this invention

page_text: 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 an arrangement of brushing device for rotary
sieves and trays arranged to work automatically or by the action of the sieve
itself.
It is best described by aid of the accompanying drawings, in which,
Fig. 1 is a vertical section through a rotary sifting machine having circular
sieves and trays and shows a brush carrying frame arranged to brush the under-
side of the sieve and the top side of the collecting tray thereunder.
Fig. 2 is a plan of the brush carrying frame in Fig. 1.
Fig. 3 is a vertical section through a rotary sifting machine having circular
sieves and trays and shows another method of arranging a brush carrying frame.
Fig. 4 is a plan of the brush carrying frame in Fig. 3.
Fig. 5 is a vertical section through a portion of a rotary sifting machine having
rectangular sieves and trays and shows a brush carrying frame arranged to brush
the underside of the sieve and the top side of the collecting tray thereunder.
Fig. 6 is a plan of the brush in Fig. 5.
The like letters apply to the like parts in all the figures.
Referring to Figs. 1 & 2-A is the outer wall of the sieve box or frame, A', is
the inner wall of the sieve box or frame. B is the sieve ring or frame which
carries the gauze covering of the sieve.
C is the gauze covering.
T is the collecting tray under the sieve.
Fare carriers fixed to the inner and outer walls of the sieve to carry the
brush carrying frame.
F', is the inner ring of the brush carrying frame.
F3, is the outer ring of the brush carrying frame.
, are bars to connect the rings F, & F².
Gare the brushes fastened to the frame by the adjusting screws S, S.
Rotary motion is given to the sieves by the crank at H and the sieves are
suspended by the rods I in the usual manner.
In practice I find that the brush carrying frame 1, is propelled at a suitable
rate when its exterior diameter is about one inch less than the interior diameter
of the outer walls, A, of the sieve box.
I prefer to place a strip of leather or other similar yielding material around
the outer periphery of the brush carrying frame ring F, to deaden the blow given
by the impact of the frame with the outer walls.
The inner diameter of the ring F', is made sufficiently large so that it cannot
come in contact with the inner walls A', of the sieve box or frame.
Referring to Figs. 3 & 4-these drawings show another method of applying
my brush carrying frame to circular sieves and trays. In this method I use
a brush carrying frame having the exterior diameter of the ring F2, of the
frame a little less than the radial distance between the exterior diameter of the
inner walls A¹, of the sieve box and the interior diameter of the outer walls A
of the sieve box. In this arrangement, the brush carrying frame revolves on
its own axis and also travels round the axis of the sieves; its revolution and
movement. being caused by impact with the interior of the outer walls causing
the brush frame to roll round the exterior of the inner walls of the sieve box.
Also I preferably make the carriers F to extend continuously round the inner and
outer walls.
Referring to Figs. 5 & 6-These drawings show a method of applying my
brush carrying frames to rectangular sieves. In this method I divide the sieve
box into a series of compartments each containing one of the brush carrying
frames, the outer walls A and the cross bars A2, attached to the outer walls A
of the sieve box have carriers F placed thereon to sustain the brush carrying
frames F.

page_text: In this method I make the exterior diameter of the brush carrying frame
about one inch less than the distance between the walls A and the cross bars A².
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I would have it
understood that I am aware that it has been proposed to fit rotary sieves with
radial cleaning brushes carried on a frame free to move to a certain extent
transversely over the sifting surfaces and that such frame has been actuated by
contact with the walls of the central part of the sieves: but, I declare that
what I claim is:-
The improvement in brushing sieves or trays having a substantially hori-
zontal rotary motion, which consists in arranging a brushing device free to
move horizontally in any direction over the sieve and rather less in diameter in
plan than the smallest distance between two parallel walls of the sieve, and
supported substantially as described, whereby the brushing device is caused to
travel round the sieve through the impact between its periphery and the outer
walls of the sieve or surfaces travelling with the outer walls.
Natal thi 09.1 day of Tune 1900
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.