Year: 1888

page_text: We CARL ROBERT GRUNDIG of 16 Grünestrasse, Gentleman, ERNST LÖWE of 6
Maternistrasse, Mechanician, and FRANZ ZAHN of 62 Amonstrasse, Mechanician, all
of Dresden Saxony in the Empire of Germany, do hereby declare the nature of our
said 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 effect improvements in the means of, and
apparatus for, separating dust from air currents impregnated therewith, and to collect
such dust in a chamber arranged below the apparatus from whence it may be
conveniently carried away in sacks or otherwise. Such air currents are produced in
many branches of manufacture, such as flour and grain mills, paper mills, and spinning
and weaving mills.
Our invention consists of an air pipe for the reception of the current of air to be
cleansed, arranged as a spiral or volute passage, which passage the air is caused to
traverse from the periphery to the centre where the purified air escapes; the dust
being separated therefrom in its passage.
And in order that our said invention may be particularly described and ascertained,
reference is hereby made to the accompanying drawings, in which similar letters of
reference indicate corresponding parts.
Fig. 1 is a sectional elevation. Figure 2 is a plan, and Figure 3 a section on the
line 1-2 of Fig. 1, shewing one of the openings for the passage of the dust.
The bed plate a a is constructed of cast iron and bolted to posts c_c. It is formed
as a spiral each spiral section having an inclined floor as shewn in Fig. 1. Against
the vertical sides the plates b b are secured and these sustain the roof or cover d.
Other plates e e are attached to the roof by suitable means which divide the passages
into two parts. These plates ascend to within a short distance of the floor, leaving
spaces for the passage of particles of dust.
The plates forming the walls bb and division plates e e are fitted with pipes 9 9
resembling skelps, having slotted openings towards the air current. These pipes g g
are placed in a slanting direction towards the air current so that dust may be
arrested thereby and carried down the pipes. The lower ends of these pipes open
into chambers h h below the floor where provision is made for the dust to settle and
collect ready for removal.

page_text: The arrangement of the channels subjects both the currents of air, and the dust
carried thereby, to the effect of centrifugal force, whereby the dust impinges against
the outer sides of each channel and is intercepted by the pipes g g and carried
downwards through the openings in the floor. The particles of dust which do not
happen to pass down the pipes g g fall upon the slanting floor and are carried along
the same until they arrive at one of the slots down which they are carried beneath
the floor to be subsequently removed.
o is a section on the
When the air has travelled in the direction of the arrows to the centre k it escapes
freed from dust in a vertical direction by means of the shaft m.
Referring to Fig. 1 n is a section on the line 3. 4 of Fig. 2.
line 5. 6 of fig. 2 and p is a section on the line 7. 8 of Fig. 2.
The slots or openings consists of plates placed at an angle facing the current of
air, as shewn in section in Fig. 3 for the passage of dust.
In order to prevent the stoppage of the air in the channels and slots, the close
chamber is connected by means of any suitable air pipe with the external tube, so
that the air compressed in the lower chamber is caused to pass again through the
whole apparatus.
The inclination of the pipes and passages, their numbers, sizes, forms, and other
arrangements, may be varied to suit the circumstances under which they are required to
operate, and the character of the air to be cleansed.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
-
1. The method of cleansing and purifying air, and conveying the dust to suitable
receptacles, by means of a channel arranged in a volute form, substantially as
herein before described and shewn on the drawings.
2. In apparatus as aforesaid the application and use in combination therewith of
the slotted tubes g g substantially as and for the purpose herein before described and
shewn on the drawings.
3. In apparatus as aforesaid, the application and use in combination therewith of
the openings in the floors of the channels, substantially as and for the purposes
herein before described and shewn on the drawings.
4. The general construction arrangement and combination of the several and
respective parts together forming our invention of an improved spiral dust collector
substantially as hereinbefore described and shewn on the drawings.
Dated 20th March 1888
GEO.
DOWNING,
8, Quality Court, W.C.,
Agent for Applicant.