Year: 1888

page_text: 1, ROBERT LUCASS DOWNTON, of the Chamber of Commerce Buildings, City of
St. Louis, in the State of Missouri, one of the United States of North America, Dust
Collector 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 present invention relates to an improved device for the purpose of arresting
and collecting the dust and fine particles of material carried into the machine, the
device being particularly intended for use in connection with flour-mills for arresting
and collecting the fine flour, but it may be used in connection with other machines or
manufactures, for arresting and collecting their dust.
This invention consists in features of novelty hereinafter fully described and pointed
out in the claims
On the accompanying Sheet of Drawing-
Figure 1 is a vertical longitudinal section, taken on line I-I, fig. II.
Fig. II is a transverse horizontal section, taken on line II, II, fig I
Figs III and IV are detail views, showing the lower end of the machine, fig III
being a front view, and fig IV a side view.
Fig. V is a section, taken on line V, V, fig. I, and on the same line, fig. IV.
Fig VI is an enlarged detail section, taken on line VI, VI, fig I
Fig. VII is a detail view
Referring to the drawings, 1 represents an outer, imperforated cylinder, which is
preferably made in the form or shape of the frustum of a cone, as shown in the
drawings. It is open at its lower end, as shown at 2, to permit the passage of the
material. Within this outer cylinder is a second cylinder 3, which is also preferably
made in the shape of a frustum of a cone and is smaller than the outer cylinder,
leaving a space or chamber 4 between the two. This inner cylinder is preferably
perforated, as shown in the drawings, and it has an open lower end 6 and an open
upper end 7. The lower end of the inner cylinder is preferably some distance above
the bottom of the outer cylinder.
The air, carrying with it the dust to be settled and collected, enters through a
flue & connecting tangentially with the outer cylinder at top, as shown in figs I
and II, and the material is delivered through this flue into the chamber 4 between

page_text: the cylinders. After entering the chamber, the air circulates therein and escapes
through the perforations in the cylinder 3 and out at the open, upper end of the
cylinder at 7, as indicated by the featherless arrows As the air, escaping through
the perforations in the cylinder 3, carries more or less of the dust or fine flour with
it, I arrange a disc 10 over the cylinders, which is preferably mounted on a shaft 11
stepped into a bearing 12 at the lower end of the outer cylinder, and it is journaled
at top in a cross-bar 13 secured to the top 14 of the outer cylinder, 1 To the shaft 11
is secured a brush 16, by means of arms 17. The brush is preferably enclosed in a
casing 18, to exclude the air, and is open in front, (see figs. I and VI); the lower end
of the casing being provided with a spout or chute 19, (see fig. I) The brush
revolves within the upper, imperforated end 19 of the cone 3, and acts to remove the
flour or dust that may settle on this part of the cone; such flour or dust, being dis-
charged through the spout or chute 19, passes down through the cone and is delivered
through the open lower end of the cone or cylinder 1 The shaft 11 is turned by the
current of air coming in contact with the casing 18 in circulating through the cone 3,
which is sufficient to turn the shaft, it not being necessary to turn the shaft at any
high rate of speed, or at even a regular or constant rate, but it may turn very slowly,
and even intei mittently.
Any fine particles of flour oi dust that may be carried out of the cylinder 3, through
the opening 7, accumulates on the under side of the disk 10 secured to the upper end
of the shaft 11, as stated This disk turns with the shaft, and the flour or dust
collected thereon is removed by a conveyer 21 and discharged through a spout 22.
The conveyor is geared to the shaft 11, as shown at 23, and thus receives its motion
from the shaft.
The lower end of the cylinder 1 is provided with a neck 24 with a closed bottom 25
having a discharge spout 26 The spout is provided with a hinged valve 27,
preferably provided with sides 28 and which opens as soon as there is an accumulation
of flour in the spout, and when the flour passes out it swings shut again. This
prevents an upward draft of air through the spout The flour that settles on the
bottom of the neck 24 is conveyed to the spout 26 by means of wings 29 on the
shaft 11, (seo figs. I and V).
30 represents a door hinged to the neck 24, (see figs I, III, IV and V), and by
means of which the interior of the neck may be examined.
In fig. VII, I have shown a portion of the disk 10 and conveyer 21, and in this
case the disk is provided on its lower surface with a fibrous material, which may be
used, if desired, to better collect and hold the fine particles of dust which are removed
by the conveyer, as the disk revolves
In figs. I and II, I have shown two plates 33 located in the upper part of the
chamber 4, the office of which is to check or break the rotary motion of the air-
current within the cylinder, which might attain an undesirable velocity or speed.
I prefer to make the perforations in the inner cylinder larger at bottom than at top,
so that the air will be more equally distributed in its passage through the cylinder
from the chamber 4.
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
1. In a dust-arrester and collector, the combination of the outer, imperforate
cylinder, an inner perforated cylinder smaller than the outer cyhuder, and a flue
having a tangential opening, through which the air and dust are deposited into the
upper part of the chamber between the cylinders, substantially as and for the purpose
set forth.
2. In a dust-arrester and collector, the combination of the outer, imperforate
cylinder, inner perforated cylinder, and delivery flue, having a tangential opening,'
said cylinders being in the form of a frustum of a cone, and the inner cylinder being
smaller and contorming in shape with the outer cylinder, and said flue being located
at the top of the machine, substantially as and for the purpose set forth.

page_text: 3. In a dust-arrester and collector, the combination of the outer, imperforate cone-
shaped cylinder open at its lower end, inner, perforated cylinder, smaller than, and
conforming in shape with, the outer cylinder, and delivery flue opening tangentially
into said outer cylinder at the top of the machine, the lower cylinder being open at top
and bottom, substantially as and for the purpose set forth.
4 In a dust collector and arrester, the combination of the outer imperforate
cylinder, an inner cylinder smaller than the outer cylinder, and a flue through which
the air and dust are deposited into the chamber between the cylinders, said inner
cylinder having perforations varying in size substantially as set forth.
5. In a dust-collector, the combination of the outer cylinder, an inner cylinder, a
shaft located within the cylinders, and a brush on the shaft, substantially as and for
the purpose set forth.
6 In a dust-collector, the combination of an outer cylinder, having a tangential
opening, an inner cylinder, a shaft located centrally within the cylinders, a brush
secured to the shaft, and a casing on the brush, substantially as and for the purpose
set forth.
7. In a dust-collector, the combination of the outer cylinder having a tangential
opening, an inner cylinder, a shaft located within the cylinder, a brush on the shaft,
a casing secured to the brush and having an open front, and a spout on the casing,
substantially as and for the purpose set forth.
8 In a dust-collector, the combination of the outer cylinder, an inner cylinder, a
vertical shaft, and a brush secured to the shaft; the inner cylinder having a lower
perforated portion and an upper, imperforate portion against the latter of which the
brush works, substantially as and for the purpose set forth.
9. In a dust-collector, the combination of the outer cylinder, an inner cylinder, a
vertical shaft, and a disk located on the shaft above the cylinder, substantially as and
for the purpose set forth.
10 In a dust-collector, the combination of the outer cylinder, an inner cylinder, a
vertical shaft, a disk located on the upper end of the shaft, and a conveyer for
removing the flour or dust from the disk, substantially as and for the purpose set
forth.
11 In a dust-collector, the combination of the outer cylinder, an inner cylinder, a
vertical shaft, a brush located on the shaft, a disk secured to the shaft above the
cylinders, and a conveyer for removing the flour or dust from the disk, substantially
as and for the purpose set forth.
12 In a dust-collector, the combination of the outer cylinder having a tangential
opening, an inner cylinder and the inclined strips located in the chainber between
the cylinders at their upper parts, substantially as and for the purpose set forth.
13. In a dust-collector, the combination of the outer cylinder, an inner cylinder,
a vertical shaft, a neck having a closed bottom, on the lower end of the outer cylinder,
a delivery spout secured to the bottom of the neck, and wings on the shaft, sub-
stantially as and for the purpose set forth.
14. In a dust-collector, the combination of the outer cylinder, an inner cylinder,
a vertical shaft, the neck secured to the lower end of the outer cylinder having closed
bottom, a spout on the bottom of the neck, and a valve hinged to the spout,
substantially as and for the purpose set forth.