Improvements in Dust Separating, Collecting, and Air Filtering Machinery.
Year: 1889

page_text: Date of Application, 17th Aug., 1889
Complete Specification Left, 15th May, 1890-Accepted, 21st June, 1890
PROVISIONAL SPECIFICATION.
Improvements in Dust Separating, Collecting, and Air Filtering
Machinery.
We, HARRY RICHMOND CHUBB of 21 Ashburnham Grove Greenwich in the County
of Kent Engineer, and ALFRED YOUNG of 76 South Street Greenwich in the County
of Kent Brewer do hereby declare the nature of this Invention to be as
follows:-
The object of this Invention is to more completely separate the dust, especially
the very fine light dust, from the air discharged by ventilating and other fans, than
at present is done by the ordinary stive room or any of the many apparatus used
for this purpose.
The machine as we prefer to construct it consists of a drum with a hollow centre
made of wire work, which is partly filled with charcoal, coke, shells, rough virgin
cork or any other convenient material, and revolves slowly in a trongh of water;
this trough has a casing fixed over the top of it and terminates in a chimney, or
large tube, to convey away the filtered air. The dust laden air is conveyed from
the fan, through a tube, to the hollow centre, also made of wire work, of the drum,
to escape from which to the exit shaft it is obliged to pass through the filtering
material, which, being wet, retains every particle of dust and which by the friction
of the ever shifting filtering material, caused by revolving motion of the drum, is
washed off by the water and becomes mud, and is thus easily conveyed through
suitable valve, at the bottom of the trough, to the drains, thus passing away in a
manner which is much more convenient and less trouble than if it were left a dry dust
and had to be disposed of in a special manner.
a
In order to more thoroughly wash the mud out of the filtering material, than is
done by the mere revolving in the trough, the outside of the drum is fitted with a
number of troughs, similar to the buckets of a water wheel, which becoming filled as
the drum revolves, discharge their contents in a shower over the filtering material
as each bucket or trough is travelling through the upper half of the drum's circuit. Or
this same object may be effected by a continuous, spray of water, or where economy
of water is desirable, by a periodical discharge from a waste preventer tank, through
a perforated pipe fixed over the top of the drum.
The discharge of the mnd at the bottom, when cleaning out the trough, is assisted
by a small agitator at the bottom which stirs up the mud, if it has become set.
The trough is fitted with an overflow stand pipe.
Part of the casing over the trough is made to remove to enable the drum to be
easily got at for cleaning or recharging it with fresh filtering material. This latter
operation is effected through a small man-hole in the side of the drum.
Where heavy dust has to be dealt with a deposit chamber with baffle plates, to
assist the despositing of the dust, may be fixed between the fan and the drum.
Dated this 17th day of August 1889.

page_text: COMPLETE SPECIFICATION.
Improvements in Dust Separating, Collecting, and Air Filtering
Machinery.
.
We, HARRY RICHMOND CHUBB, of 21 Ashburnham Grove Greenwich in the County
of Kent, Engineer and ALFRED YOUNG of 76 South Street, Greenwich in the County
of Kent, Brewer, 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 object of this Invention is to separate dust, especially very fine light dust;
from the air discharged by ventilating and other fans, more completely than at
present is done by the ordinary stive room or any of the many apparatus used for
this purpose.
The machine, as we prefer to construct it, consists of a drum with a hollow centre-
the periphery, and the said hollow centre are of wire work, or perforated metal
plates. The drum is partly filled with charcoal, rough virgin cork, chips of wood or
any suitable material, and revolves slowly in a trough or tank of water. The dust
laden air is conveyed from the fan, through a tube to the hollow centre of the drum,
and to escape from the drum, it is obliged to pass through the filtering material which
being wet, retains every particle of dust, whilst the air from which the dust has been
separated escapes, or if the drum be fitted with a casing with an exit tube-as may
be necessary for some purposes, the purified air passes up this tube or chimney and
is discharged at any convenient point.
The dust adhering to the filtering material is washed off into the water at each
revolution of the drum, by the friction of the ever-shifting filtering material (caused
by its revolving motion) and becomes mud. The mud is easily conveyed away to the
drains, through a suitable valve at the bottom of the trough or tank, at such intervals
as may be found necessary. The matter is thus disposed of in a much more con-
venient manner and form, and with less trouble than if it were left a dry dust and
had to be disposed of in a special manner.
For some purposes it may be found that the mere revolving in the water may not
be sufficient to wash the mud off the filtering material; in such cases the outer
periphery of the drum may be fitted with a number of troughs, somewhat similar to
the buckets of a water wheel, which as they revolve through the water fill and as they
travel through the upper half of the drum's circuit, discharge their contents in a
shower over the filtering material. Or the same object may be effected by a con-
tinuous spray of water, or where economy of water is desirable by a periodical
discharge from a waste preventer tank, through a perforated pipe fixed over the top
of the drum.
The discharge or running off of the mud, is assisted when necessary by a small
agitator at the bottom of the tank to stir it up should it have become set.
The tank is fitted with an overflow stand pipe, which is constructed to serve also as
the outlet or discharge valve for the mud.
The casing over the tank can be removed to enable the drum to be easily got at for
cleaning or re-charging it with fresh filtering material. This latter is effected through
a small hand hole in the periphery of the drum.
Where heavy dust has to be dealt with a deposit chamber with baffle plates to assist
the depositing of the dust may be fixed between the fan and the drum.
In the accompanying drawings.
:-
Figure 1 represents a plan of the machine with the top casing removed.
Figure 2 is a front elevation with the front side of the casing removed.
Figure 3 is a sectional end elevation through the centre of the machine.
A is the tank containing the water in which the drum B revolves, C is the hollow
centre made of wire work or perforated plate D, a hollow casting fixed to the drum
through which the air and dust pass from the fan to the drum, and which revolves
with the drum on 2 friction rollers E. E' in groove F. G is a trunnion fixed on the
opposite side of the drum, it runs in a bearing H. I is a fixed mouth piece to

page_text: receive a tube or wooden shoot, conveying the air and dust from the fan; in the
drawing it is shown square to receive a wooden shoot, but it may be made of any
shape to suit the tube, to which has to be connected. J, is a round clip made in two
balves, it tightens on a plaited hemp band, or some suitable soft packing, in a groove
between the fixed mouthpiece I, and the revolving one D, to make an air tight joint
between them.
K is a pulley by which the drum is driven by belting L are the buckets fixed to
the periphery of drum. M is the stand pipe and discharge plug. N is the hand hole
for charging the drum with the filtering material. O a line showing the working level
of the filtering material. P is a line showing level of water in tank. Q is the agitator
for stirring up the mud before discharging it. R the pulley by which the agitator is
driven.
our said
Having now particularly described and ascertained the nature of
Invention and in what manner the same is to be performed we declare that what
we claim is :-
1. A machine substantially as described for collecting dust and separating the same
from air, the said machine consisting of a drum revolving partly immersed in water,
and containing pieces of charcoal, cork, wood, or other material which thereby are
alternately immersed in and withdrawn from the water, and of passages so arranged,
that air laden with dust may be conducted amongst the said pieces where they are
out of the water and caused to permeate the narrow spaces between them as herein
set forth.
2. The combination with a machine, such as is claimed above, of buckets, aiding
in the application of water to the dust collecting surfaces, substantially as described.
Dated this 29th day of April 1890.
H. R. CHUBB.
A. YOUNG.