Year: 1886

page_text: I, GEORG KIEFER of Feuerbach Stuttgart, Wurtemberg, in the Empire of
Germany, Engineer 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 objects to overcome the great defects heretofore
experienced in rotary dust collectors, by constructing the dust collectors on
different, novel, and rational principles.
The invention consists firstly, in constructing the separate cells of the dust
collector as independent elements and to fit together the filter drum in a simple
manner, whereby the same is made detachable, easily repairable, and strength and
lightness are combined.
Secondly, in causing the air to be sucked from one or both end surfaces, instead
of out of the hollow cylinder of the drum, which facilitates the mounting of the
filter drum on a plain shaft of small diameter, and the air sucked on has only to
travel a very short and straight way to the exhaust fan, passing openings in the
end surfaces of the cells, which are almost equal in section to those of the cells and
being very large proportionately.
The air to be sucked off meets inside the drum with the least possible resistance
which causes the apparatus to become very serviceable by a moderate use of power.
Thirdly, in freeing the filter surfaces of the collected dust in a most perfect
manner by the employment of a stream of air, produced in close proximity, in a
peculiar manner, by the exhaust fan, which stream passes the filter cells in a
reversed direction under pressure from the inside to the outside.
Fourthly, in producing by such construction, in a simple manner a durable and
perfect tight apparatus after rational principles.
And in order that this invention may be better understood I have caused to be
appended hereunto one sheet of drawings marked with letters of reference
indicating like parts throughout the various figures.
Figs. 1 and 2 are front and side elevations respectively partly in section and
representing the vertical arrangement,

page_text: Figs. 3 and 4 are longitudinal and cross, sections respectively of the horizontal
arrangement.
Figs. 5, 6 and 7 are detached views of the filter drum.
In carrying, out my invention and referring to Figs. 1 and 2 I mount inside a
perfectly closed box G, G' the filter drum F which is provided with the pivots 8, 8¹.
On the edge of the upper end surface of the drum F a packing ring r, which
corresponds with a second ring fixed to the lid of the box G G is fixed in such
a manner, and between and a felt ring inserted, that above the upper end
surface of the filter drum, a space, viz, suction space, is formed which is separated
from the other space of the box G, G¹.
Out of this suction space the exhaust fan V, draws the air, which is mixed with
dust entering at N the box G, G¹, and leaving the dust behind when passing
through the flannel surfaces of the filter into the said space R in the direction as
indicated by the arrows 1 & 2.
The filter drum F is composed of 16 to 50 separate cells according to the size of
the apparatus. Such cells are formed with a frame a, b, c, d see Figs. 5, & 7, the
surfaces of which are covered with flannel correspondingly as indicated by dotted
lines in Fig. 7.
Every one of these cells are screwed to the core of the filter drum by means of
the flanges c and d.
In the vertical arrangement the top end boards a, c of the cells are only formed
with slots m, n, whereas in the horizontal arrangement in both the top and bottom
boards a, c & b, d slots m, n are formed, by means of which communication is
established between the inside of the cells and the suction space R and exhaust
fan V.
Figs. 5 and 7, show the further construction of such cell drum, which is
complete on inserting the wedges K, K¹ between the cells, whereby the cutting off
of the suction space R from the other air space of the box G, G¹, is effected.
It will be seen that the described construction permits of every cell of the filter
body after loosing the screws from the cylinder B being readily and independently
taken away from the other parts.
The working of the apparatus is as follows:-
On the exhaust fan V drawing air, dust mixes with it and enters into the lower
part of the box G, G³, from where it passes through the flannel covering of the
cells to the inside of the cells leaving the dust behind, and from the latter through
the openings n, m in the direction of the arrows 1, 2, direct to the exhaust fan
and atmosphere.
But this occurrence can only take place advantageously, as long as the pores of
the flannel surfaces are not filled up by the collected dust, which makes the
periodical cleaning of the flannel, necessary.
This cleaning takes place firstly by means of the compressed air conducted into
the inside of the cells, secondly by the following working off arrangement :-
From the main shaft of the apparatus W, the exhaust fan V is driven, also the
shaft w, on which is fixed the lever arm e, and which on each revolution turns the
filter drum by means of the pin p, the distance of oue cell.
In this manner the separate cells arrive in rotation in the suction space R, above
a hopper-shaped leather bag and below the board z, whereby the suction of air
through the respective cells is also stopped, viz, set out of function.
At this time communication is established with the inside of the exhaust fan,
namely by the openings o and o¹, in order that a small part of the air under
pressure, expelled by the exhaust fan, following the part 4, is entering the inside
of the cell F to be cleaned.
This stream of air penetrates the flannel covering of the isolated cell thereby
blowing off the dust collected on the outside, which after the isolation of the cells
sticks fast in the hairs etc, and the web and does not fall off on account of its own
weight

page_text: This operation is also further carried out by the well known means, a knocking
hammer H, which is caused by the lever arm h, fixed on the shaft wand simple
mechanism shown in the drawing, to come into contact with the cells at i..
The dust so removed falls into the hopper-shaped bag which conveys it through
the outlet A, into a bag which at the same time forms an outlet for the compressed
air for the inside of the cell isolated at times.
On the horizontal arrangement of this dust-filter two exhaust fans are employed,
one on each end of the same.
The sucking off of the air freed from dust is therefore double because it takes
place on each end of the filter drum the compressed air enters also from both ends,
the inside of the cells to be cleaned.
This horizontal apparatus therefore, as regards the quantity of dust it will
collect, most serviceable and suitable for construction in large sizes.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
In dust collectors.
1st A rotating dust collector with a filter drum, composed of separate cells, thus
partly or wholly detachable, as set forth.
2nd A rotating dust collector with a detachable filter drum composed of cells
with air suction from one or both ends of the filter drum and with one or two
suction spaces produced by tightening rings in straight and direct communication
with one or two exhaust fans, as set forth.
3rd A rotating dust collector having a counter stream produced and conducted
into close proximity into the cells by one or two exhaust fans as set forth.