Improvements in Apparatus for Separating Dust or Small Particles from Air.
Year: 1889

page_text: Date of Application, 20th May, 1889
Complete Specification Left, 20th Feb., 1890-Accepted, 22nd Mar., 1890
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Separating Dust or Small Particles
from Air.
I JOHN MURRAY CASE of 1,112 Long Street Columbus Ohio in the United States
of America Manufacturer do hereby declare the nature of this Invention to be as
follows:-
My Invention has for its object to construct a fan in such a manner or provide it
with such additions that it will produce a suction of the dust laden air into the case
and separate the dust from the air and deliver the air practically free from dust.
To
accomplish this I employ a fan with blades and with an eye opening into the
centre on one side of this fan into which eye the dust-laden air is drawn by the
operation of the fan. I arrange in connection with the fan case on the side opposite
the eye an extended cylinder preferably about the same width as that of the fan
casing proper the said extension constituting a receiving chamber for the air forced
forward by the fan blades. At the opposite end of the fan from that at which the
air is received and between the fan proper and the aforesaid extension or chamber
I place a partition which extends to within a short distance from the surface of
the fan case.
This partition forms a stoppage to prevent the air from drawing in
from the opposite end of the fan case and by the operation of the fan blades the
dust laden air is forced to the periphery or outside surface of the fan case; and
by the pressure produced it is forced through the space left by the aforesaid
partition and passes into the air chamber beyond with a rapid rotary motion
produced by the action of the fan blades. In this air chamber the dust laden air
continues to move round in great rapidity which causes the dust or fibrous material
which may be in the air to move with considerable force to the periphery by
centrifugal force; while by the continued pressure the purified air is forced to the
centre and exhausts out of an outlet provided at the centre of the air chamber at
the end opposite to that from which the dust laden air was received. At the bottom
or periphery of this dust-catching chamber I form an opening which is connected
with a tube or passage leading away from the machine. The dust having been
thrown to the periphery of the air chamber it is caught in this small opening and
conducted out froin the machine while the air having been separated from this
dust is discharged from the centre of the air cylinder as above described. I may
provide around the centre of the exit of air a drum of slats or bars or the like
through which air openings are left. This drum of slats or bars or the like is
preferably connected with the fan shaft so as to revolve with the fan, and serves
to additionally ensure the catching of the dust by causing the air to exhaust equally
from all parts of the machine and prevents any sharp air currents at any one point.
J. H. JOHNSON & Co.,
47. Lincolns Inn Fields. W.C., Agents. .
COMPLETE SPECIFICATION.
Improvements in Apparatus for Separating Dust or Small Particles
from Air.
I JOHN MURRAY CASE of 1112 Long Street, Columbus, Ohio, in the United States
of America, Manufacturer, 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 :—
My Invention has for its object to provide a simple and efficient apparatus for

page_text: separating dust from air, and consists of a chamber in which is a fan, so arranged or
provided with such additions as hereinafter described that it will when in action,
produce a suction of the dust laden air into the apparatus separate the dust from the
air and then deliver the air from the apparatus practically free from dust.
I will describe my invention with reference to the accompanying drawing Figure 1
of which is a longitudinal section of a separating apparatus constructed according to
my Invention. Figure 2 a transverse section on the line 1-2 Figure 1 and. Figure 3
a transverse section on the line 3-4 Figure 1.
A is the casing of the apparatus which is preferably cylindrical and may be made of
any suitable material, for example the, ends a a² may he made of cast iron, or of
wood as shown and the body of sheet iron which may be connected to, the ends
by screws or otherwise. Passing through the casing A and mounted in bearings e at
the ends thereof, is a shaft C receiving motion from any suitable prime mover by
means of a strap passing round the pulley d. On this shaft C is mounted a fan D the
blades e of which when the shaft is rotated draws dust laden air through the passage
or eye E into the casing A¹.
The casing A on the opposite side of the fan D to that of the passage E, is extended
and forms a receiving chamber G for the air forced forward by the fan blades e through
openings in the casing arranged as shown in Figure 2.
Between this chamber and the fan there is a partition F extending to within a short
distance of and leaving
an annular passage f between it and the inner surface of the
casing A. This partition forms a baffle which prevents air from being drawn in by
the fan from the opposite end of the casing. By the operation of the fan blades the
dust laden air drawn into the apparatus at the eye or passage E is forced through
the openings 62 in the casing A¹ in a direction tangential (or approximately so) to the
circumference thereof to the inner surface of the casing A and passes thence through
the annular space f left between the partition F and the casing, into the chamber G. If
desired a rapid rotary motion may be given to the dust laden air in the chamber G by
means of blades i (shewn by dotted lines in Figures 1 and 3) mounted on the shaft C
which blades by their centrifugal motion cause the dust or fibrous particles which may
be in the air to move with considerable force towards the inner surface of the casing A
while by the continued pressure of the air drawn into the apparatus at E, purified air
is forced to the centre and out of the apparatus by the outlet g provided at the centre
of the end a². At the bottom of this dust catching chamber G I provide an opening h
with which is connected a tube or passage & leading away from the machine. The
dust having been thrown to the periphery of the air chamber G enters the opening.
and is conducted by the tube from the apparatus while the purified, air is discharged
through the opening in the centre of the end a² of the apparatus, as herein before
described.
In combination with or in place of the blades i on the shaft C I may provide
stationary slats or bars or the like round the air outlet in the end a² which slats or
bars serve to more completely ensure the catching of the dust, by causing the air to
exhaust equally from all parts of the machine and prevent any sharp air currents at
any one point.
Having now particularly described and ascertained the nature of my said inven-
tion and in..what manner the same is to be performed I declare that what I
claim is -
First. The general combination and arrangement of parts (with or without the
blades) constituting an apparatus for separating dust or small particles from air as
herein before described and illustrated, by the accompanying drawings.
Second. In apparatus for separating dust or small particles from air a fan having
blades arranged to rotate in a casing provided with slots or openings through which
the dust. laden air is forced by the blades into a chamber in which, by the centrifugal
motion given by the blades to the dust laden air, the dust is separated from the air
which thus purified passes from the chamber substantially as hereinbefore described
with reference to the accompanying drawings.

page_text: Third. In apparatus for separating dust or small particles from air, a cylindrical
chamber divided by a partition into two compartments the said compartments com-
municating with each other by an annular passage provided between the periphery of
the partition and the interior surface of the chamber, dust laden air being drawn
through an opening in one end of the chamber into one of the compartments by the
blades of a fan rotating in a casing in this compartment the said dust laden air being
forced by the fan or rotating blades through openings in the casing in a direction
tangential (or approximately so) to its circumference and thence through the annular
passage into the other compartment in which by reason of the centrifugal motion given
by the fan or blades to the dust laden air the dust is separated and forced towards the
periphery of the chamber while the air in a comparatively purified condition passes
through an opening in the end of the apparatus substantially as herein before described
with reference to the accompanying drawing.
1 L J
I
1000
J. H. JOHNSON & Co.,
Agents.