IMPROVEMENTS IN APPARATUS AND IN MATERIAL EMPLOYED THEREIN FOR FILTERING PURPOSES
Year: 1885

page_text: COMPLETE SPECIFICATION.
I LORENTZ ALBERT GROTH, K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 80 Finsbury Pavement London EC. do hereby
declare the nature of said Invention for "IMPROVEMENTS IN APPARATUS AND IN
MATERIAL EMPLOYED THEREIN FOR FILTERING PURPOSES a communication to
me from abroad by Carl Piefke, Gentleman of the City of Berlin German Empire,
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 certain improvements in the Patent No 21141
granted to me on the 14th of May 1881 and consist principally in using the special
material described therein in a solid and pressed state in the form of cakes; and
in the modification of the apparatus as required accordingly.
By these arrangements the apparatus may be much reduced in height, or a
larger number of filtering sieves or elements be used in the same space.
:
In order however that the invention may be fully understood I will describe
more particularly in what the same is to be performed by the aid of the accom-
panying drawings in which are shewn the three modifications of the apparatus
already described in the previous patent.
Fig 1 is a vertical section of the apparatus showing the arrangement for admitting
the liquor, to be filtered, at the bottom and discharging it at the top of the vessel
or inversely-A is the cylindrical metal vessel containing the sieves or elements b
which are arranged one above another round a central tube c and provided with
cylindrical walls of the same height on their outer as well as inner sides and by
means of horizontal partitions are divided into two compartments The upper
compartment of each element is on its outer side provided with an inlet opening
and the lower one with outlet openings on their inner sides.
Between each two of the elements b a pressed cake of the filter material is
placed, which thus forms the filter serving as floor to one and ceiling to the other
compartment.

page_text: The sieves or elements bare by means of the tube c connected with the lid of the
vessel thus enabling the whole system to be removed for cleaning or renewing
the filter cakes.
The liquid to be filtered is admitted to the vessel at the bottom by a and passes
from the sieves or elements through the outlets thereto into the central cylindrical
tube whence it escapes in a filtered state through the pipe d.
The passage of the fluid can be reversed by admitting it at d and allowing it to
escape at a.
Fig 2 is a modification in which the fluid passes in an upward direction through
the filtering medium.
Fig 3 shows a modification of Fig 1 and 2. in which two different elements b
and 6¹ are placed alternately above each other, the element 61 being provided with
horizontal partitions over as well as under which is placed the element b. which is
provided with rods instead of partitions to connect both cylindrical walls on each
side of which the outer one is provided with an inlet.
The element 6 could also be provided with partitions and openings in the outer
wall while b¹ could have rods.
Between the parts b and b¹ are placed the filter cakes and the whole apparatus
is by means of the bottom plate e cover f and tube c put together as in fig 1
and 2.
The fluid as before described is admitted to the vessel A at the bottom by a
passes through the openings in the outer walls of the elements b where it goes up
as well as down through the filter cakes and thence by the openings in the inner
wall in the element 61 to the pipe d.
This apparatus can be turned upside down in which case the elements are
conected by means of the tube with the bottom instead of the cover.
According to the thickness of the filter cakes they may be placed on sieves, rods,
or alone without either.
Instead of making these cakes from the material described in my previous
Patent they may be made of any sutable material while if necessary an air cock g
may be fitted on the apparatus.
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
1 The use of a filtering material in the shape of a cake in the apparatus patented
by me 17th May 1881 N° 2114.
2 The use of a filtering material in the shape of cakes in the modifications of the
before mentioned apparatus, herein described.
3 The improvements in the said apparatus for filtering purposes consisting
principally of the construction and arrangement of the single filter chambers
or elements made in a ring shaped form with cylindrical sides between the borders
of which the filter cakes are placed these elements are provided
(a) with openings in the inner or outer cylindrical side over or under a hori-
zontal partition the inlet being on one and the outlet on the opposite side Fig 1
and 2, or
(b) alternately with inlets in the outer or inner side of one element and outlets
in the opposite side of the next one in which case arms or rods may be used instead
of partitions..