Year: 1886

page_text: Date of Application, 24th Apr., 1886.
Complete Left, 24th Jan., 1887.
Complete Accepted, 25th Feb., 1887.
I, CARL WILHELM RABITZ, of Hamburg, in the Empire of Germany, Plumber, do
hereby declare the nature of this invention to be as follows:-
-
This invention relates to improvements in filtering apparatus, in which the liquid is
filtered by passing from the outside into the interior of suitable filtering drums; and
the object of the said improvements is to facilitate the cleaning of the filtering layers
covering the said drums.
To attain this object I arrange a hollow shaft within a cylindrical vessel and fix
upon the said shaft hollow drums covered with suitable layers of filtering material,
such as felt for instance. The interior of each drum communicates by openings with
the interior of the hollow shaft. The liquid entering the cylindrical vessel percolates
through the filtering layer into the drums and passes therefrom into the hollow shaft,
which extends through a separate compartment of the cylindrical vessel. The filtered
liquid flows into the said compartment, from which it may be drawn off.
Rods covered with stiff brushes are arranged in combination with the drums in
such a manner as to brush off all dirt and mud from the filtering layers, when the
hollow shaft which extends outside of the vessel is rotated.
The dirt or mud may be drawn off at the bottom of the vessel by means of a waste
cock or screw, while the supply-cock is open.
HASELTINE, LAKE & Co., .
45; Southampton Buildings, London, W.C.,
Agents for Applicant.

page_text: I, CARL WILHELM RABITZ, of Hamburg, in the Empire of Germany, Plumber, 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 relates to improvements in filtering apparatus, in which the liquid
is filtered by passing from the outside into the interior of suitable filtering drums;
and the object of the said improvements is to facilitate the cleaning of the filtering
layer covering the said drums.
I attain this object by the mechanism illustrated in the accompanying drawing in
which
Figure 1 is a sectional side elevation of a filtering apparatus constructed according
to my invention; and
Figure 2 is a horizontal section on the line ab, Figure 1.
Similar letters refer to similar parts in both figures.
d is a hollow shaft which is journalled within the cylindrical vessel a in such a
manner that its upper end projects above the cover of the said vessel and serves io
attach a suitable crank, or other means thereon for rotating. the shaft.
Upon the shaft d are attached hollow drums b, which are made of perforated sheet
metal, or composed of wire gauze, and covered outside with a layer of filtering
material e, as for instance, felt. The interior of the drums communicates by openings e
with the interior of the hollow shaft d.
The liquid entering the vessel a, through the supply pipe g, discharges itself through
the filtering layer c into the drums b, and therefrom flows into the hollow shaft d,
which, passing through a separated compartment of the vessel a, allows the filtered
liquid to flow out through the openings into the said compartment f, wherefrom it
may be drawn off through the pipe / according to the supply.
Rods covered with stiff brushes are placed before the drums b, in such a manner
as to brush off all dirt and mud from the filtering layers c, when the hollow shaft dis
rotated. The dirt or mud may then be drawn off at the bottom of the vessel by means
of a waste cock, or screw, k, while the supply cock is open.
.
Instead of rotating the drums I sometimes arrange the brush rods in a suitable
frame which may be rotated from the outside, while the filtering drums remain
immovable.
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 filtering apparatus, the combination of filtering drums covered with suitable
layers of filtering material, with brushes for cleaning the said filtering layers when
either the drums or the brushes are rotated, substantially as set forth.