and other impurities.
Year: 1887

page_text: Date of Application, 13th Sept., 1887
Complete Left, 5th June, 1888
Complete Accepted, 20th July, 1888
and other impurities.
I, HEINRICH SECк, of Dresden, in the Kingdom of Saxony and German Empire,
do hereby declare the nature of this invention to be as follows:-
My invention relates to an improved method of, and apparatus for freeing air laden
with dust, such as saw-dust, particles of flour and the like, of its said impurities, and
its object is to dispense with the filtering cloths heretofore generally employed for such
purpose and with the many disadvantages connected therewith.
My said invention consists in drawing or passing the dust laden air between and
through a number of rotating bodies, preferably rings concentrically arranged, and
forcing and holding by means of centrifugal force the impurities contained in the air
current, against the inner surfaces of the said rotating bodies or rings, from which
they may be removed by any suitable means. A number of series of such rotating
bodies or rings are preferably arranged in succession, one above another or side by
side so that the current of air to be purified will have to pass through several series of
such rotating bodies in succession until it leaves the last series of them in a purified
state.
The form of apparatus which I preferably employ for carrying my said invention
into practice is as follows
I provide within a suitable box or casing a vertical shaft having a number of fixed
hubs arranged at short distances one above another and carrying a number of spokes
or arms from the lower surfaces of which are suspended a number of rings of sheet
metal or other suitable material so that the said rings fastened to the arms of each hub
will be concentrically arranged around their common axis, that is around the said
vertical shaft. The casing of the apparatus is provided with an inlet for the dust
laden air at its lower end through which the said air is introduced into the apparatus
either by means of a blower or fan arranged near the said inlet or by means of an
exhauster arranged in any suitable manner at the top of the apparatus. Suitable
means are provided for rotating the vertical shaft and with it the different series of
concentric rings, thereby causing the dust etc. to be forced against the inner surfaces

page_text: of the said rings by the centrifugal force developed by the rotation, during the passage
of the dust laden air through the different series of rings. Each series of rings has
below it an inclined gutter attached to or forming part of the box or casing of the
apparatus by means of which the dust after being scraped off the rings is conveyed
out of the apparatus there to be removed by means of a worm, which may be arranged
in any suitable place near the lower part of the apparatus, or instead of one such worm
being arranged in the lower part of the apparatus there may be a number of worms,
one for each gutter, so that the dust from each series of rings may be collected and
removed independently. The object of this last named arrangement would be to
remove the finer grained dust of the upper series apart from the coarser dust of the
lower ones.
For automatically scraping off the dust collected on the inner surfaces of the several
rings during the rotation of the latter a number of upright pieces of metal, wood, or
other suitable material may be attached to the upper surfaces of the said gutters or to
the inner surfaces of the box or casing in such a way as to bear with a slight pressure
against or merely to touch the inner surfaces of the said rings and to remain stationary
while the rings are being rotated, thereby performing a scraping action against the
said rings and causing the dust to drop into the gutters below.
The apparatuses for carrying into effect my improved method may be arranged either
horizontally or vertically and the air to be thus purified may either be forced into the
apparatus by means of a blower or passed through the same by suction. In the latter
instance the sucking action on rotating the shaft with its series of rings may also be
produced by means of suitable curved wings arranged on the inner casing of the
apparatus and extending along a part of the upper surface of each series of rings.
Dated this 13th day of Sentember 1887.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
An Improved Method of and Apparatus for Freeing Air from Dust
and other Impurities.
I, HEINRICH SECK, of Dresden, in the Kingdom of Saxony and German Empire
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 relates to an improved method of and apparatus for, freeing air laden
with dust, such as saw-dust, particles of flour and the like, of its said impurities, and
its object is to dispense with the filtering cloths heretofore generally employed for
such purpose and with the many disadvantages connected therewith.
My said invention consists in drawing or passing the dust-laden air between and
through a number of rotating bodies, preferably rings concentrically arranged, and
forcing and holding by means of centrifugal force the impurities contained in the air-
current, against the inner surfaces of the said rotating bodies or rings from which
they may be removed by any suitable means. A number of series of such rotating
bodies or rings are preferably arranged in succession, one above another or side by
side so that the current of air to be purified will have to pass through several series
of such rotating bodies in succession until it leaves the last series of them in a
purified state.
My said invention is illustrated in the accompanying drawings the figures of which
are hereinafter referred to.
In one form of apparatus shown in Figures 1, 2 and 3 for carrying my said
invention into practice I provide within a suitable box or casing A a vertical shaft c
having a number of fixed hubs b arranged at short distances one above another and
carrying a number of spokes or arms a from the lower surfaces of which are suspended
a number of rings i of sheet metal or other suitable material so that the said rings
fastened to the arms of each hub will be concentrically arranged around their common
axis, that is around the said vertical shaft c.
The casing of the apparatus is provided with an inlet e for the dust-laden air at its
lower end through which the said air is introduced into the apparatus either by means
of a blower or fan arranged near the said inlet or by means of an exhauster m
Figure 1 arranged in any suitable manner at the top of the apparatus. Suitable
means are provided for rotating the vertical shaft c and with it the different series of
concentric rings thereby causing the dust and the like to be forced against the
inner surfaces of the said rings by the centrifugal force developed by the rotation,
during the passage of the dust-laden air through the different series of rings. Each
series of rings has below it an inclined gutter k attached to or forming part of the
box or casing A of the apparatus by means of which the dust after being scraped_off
the rings is conveyed to a worm h by which it is removed from the apparatus. The
said worm may be arranged in any suitable place near the lower part of the apparatus,
or, instead of one worm being used there may be a number of such worms, for
instance on
for each gutter, so that the dust from each series of rings may be

page_text: collected and removed independently. The object of this last named arrangement
would be to remove the finer grained dust of the upper series apart from the coarser
dust of the lower ones.
For automatically scraping off the dust collected on the inner surfaces of the several
rings during the rotation of the latter a number of upright pieces of metal, wood, or
other suitable material may be attached to the upper surfaces of the said gutters or
to the inner surfaces (of the box or casing in such a way as to bear with a slight
pressure against or merely to touch the inner surfaces) of the said rings and to remain
stationary while the rings are being rotated, thereby performing a scraping action
against the said rings and causing the dust to drop into the gutters below.
The apparatus for carrying into effect my improved method may be arranged either
horizontally or vertically and the air to be thus purified may either be forced into the
apparatus by means of a blower or passed through the same by suction. In the latter
instance the sucking action on rotating the shaft with its series of rings may also be
produced by means of suitable curved wings Figs. 2 and 3 arranged on the inner
casing of the apparatus and extending along a part of the upper surface of each series
of rings.
In the apparatus shown in Figures 4, 5 and 6 the air is conducted through a fixed
casing which is provided with narrow slits, and in which a number of rings
surrounding one another rotate rapidly, in order to remove coarser particles of dust
from the moving air forced by the action of the external surfaces of the rings against
the internal surface of the casing, and to conduct them to the discharge orifices by
means of a number of passages or a closed second casing, whilst the finer particles of
dust are caught by the internal surfaces of the said rings, and the purified air escapes
through the intermediate spaces between the rings. The outer of the rings can be
provided with vanes in order to transmit to these the motion of the air forced in or
sucked in and entering the casing under pressure and thus eventually rendering
superfluous the employment of a mechanical power for turning the rings.
A special motor can however be provided for turning the latter, in which case the
air impregnated with dust can be introduced into the upper part of the apparatus in a
perpendicular direction or otherwise as desired from above, from several sides or in an
upward direction.
As represented in Figures 4 and 6 the collecting rings a' which are prolonged
downwards, and the outer of which is provided with vanes a Figure 4 rest in a fixed
casing which as shown in the drawing is composed of several cylinders b¹. These
cylinders b¹, the diameters of which decrease towards the discharge orifice, are
connected with each other by rings in which narrow slits are arranged. The upper
cylinder & carries the tube 6 through which the air impregnated with dust enters the
casing, the said tube 6 being arranged opposite the air vanes a².
In the operation of the apparatus shown in Figures 4, 5 and 6 the air laden with
dust is conducted under pressure through the tube 6 and is forced by the centrifugal
power of the rings a' set in rapid rotation by a special motor or, as shown, by the air
introduced, against the internal periphery of the fixed casing 6', and moved along this
downwards. In this manner the coarser particles of dust contained in the current of
air and projected the greatest distance to the outside and therefore coming most
intimately in sliding-frictional contact with the internal surface of the casing 'escape
through the narrow slits 6 into passages c¹ or into a space d to the discharge orifice e¹,
whereas the finer particles of dust pass through the lower openings existing between
the several rings a upwards and are here caught up by the internal surfaces of the
latter and retained. The air which is in this manner completely freed from dust then
escapes through the upper openings of the rings a. For removing the dust collecting
upon the bottom of the apparatus an ejecting device f is provided upon the spindle c.
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 An improved inethod of freeing air from dust, particles of flour and the like

page_text: the said method consisting in passing the dust-laden air through a number of rotating
bodies so that the impurities contained in the air current are forced and held against
the inner surfaces of the said rotating bodies by means of centrifugal force, substantially
as and for the purpose specified.
Second-The combination of a casing a rotating shaft therein, and a series of
concentric rings connected with the shaft and rotating therewith substantially as
described.
Third The combination of a casing, a rotating shaft therein having radial spokes,
a series of concentric rings secured to the spokes and scrapers for removing the dust
from the inner surfaces of the rings substantially as described.
Fourth In machines for purifying air laden with dust, the rotating concentric
rings a in combination with a casing 61 surrounding them and provided with
openings 6 for separating the coarse dust, in which casing the air impregnated with
dust is introduced above in order to escape, preliminarily purified through the rotating
rings a' and to be freed by means of the latter from the finer particles of dust still
contained in it.
Fifth-The arrangement of vanes a' on the outer side of the rings a' in combination
with the tube 64 for introducing the air impregnated with dust, in order to render
superfluous the employment of a special motor for turning the rings.
Dated this 4th day of June 1888.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.