IMPROVEMENTS IN FILTERING PRESSES
Year: 1878

page_text: LETTERS · PATENT to Carl Kesseler, of 63, Mohrenstrasse,--Berlin, W., in the
Empire-of-Germany, Civil Engineer and Patent Solicitor, for the Invention of
'IMPROVEMENTS IN FILTERING PRESSES." A communication from Albert
Wegelin and Ernst Hübner, of Halle on the Saale, in the Empire of Germany.
"
Sealed the 3rd June 1879, and dated the 10th December 1878.
PROVISIONAL SPECIFICATION left by the said Carl Kesseler at the Office of
the Commissioners of Patents on the 10th December 1878.
CARL KESSELER, of 63, Mohrenstrasse, Berlin, W., in the Empire of Germany,
Civil Engineer and Patent Solicitor. "IMPROVEMENTS IN FILTERING PRESSES." A
communication from Albert Wegelin and Ernst Hübner, of Halle on the Saale, in
the Empire of Germany.
The improvements consist in the manufacture of presses for filtering purposes with
a differential screw pressing arrangement and a hand or other fly wheel, together
with a chanelled, cellular, or pervious receptacle or case combined with any suitable
filtering medium held between perforated or reticular metal, or other strainers
enclosed within the chanelled receptacle. The various parts may be made of metal,
and the filtering material of any convenient kind suitable to the liquid to be filtered,
which may be introduced through one or more pipes traversing the perforated plate
or otherwise.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Kesseler in the Great Seal Patent Office on the 9th June 1879.
CARI, KESSELER, of 63, Mohrenstrasse, Berlin, W., in the Empire of Germany,
Civil Engineer and Patent Solicitor. "IMPROVEMENTS IN FILTERING PRESSES." A
communication from Albert Wegelin and Ernst Hübner, of Halle on the Saale, in
the Empire of Germany.
The improvements consist in the manufacture of presses for filtering purposes with
a power increasing or potential screw pressing arrangement and a hand or other fly
wheel, together with a channelled, cellular, or pervious receptacle or case combined
with any suitable filtering medium held between perforated or reticular metal or
other strainers enclosed within the channelled receptacle. The various parts may be
made of metal; and the filtering material of any convenient kind suitable to the
liquid to be filtered, which may be introduced through one or more pipes traversing
the perforated plate or otherwise. The accompanying Drawings serve to show how
the Invention may be practically applied, Figures 1, 2, and 3 representing a filtering
press in side view, plan, and end view; Figures 4 and 5, a filtering plate in elevation
and section; Figure 6 shows how the filtering material is fixed, and how the filtering
plates are tightened against each other; n, n, is the ribbed part of the body of the
plate, and covered with perforated sheet metal 1, 1, upon which the filtering material
m, m, is placed. The latter is again covered with perforated sheet metal or wire
gauze k, k, pressed tight against the face x, x, by screws, rivets, keys, or in any other
suitable manner so as to form an absolutely tight joint inside the filtering chamber.
The tightening of the filtering plates against each other or of the whole press is
effected by means of lead, rubber, or other suitable material at the points o, o, and
the filtering material may be attached to points x, x, by means of suitably shaped
metal or other strips instead of the perforated metal sheet or wire gauze k, k. By
enclosing the real filtering material between two perforated sheets, the same is pro-
tected against mechanical wear and tear, and will therefore last longer than would
be the case in ordinary presses. Figures 7, 8, and 9 refer to a press with a different
sort of filtering material serving for the filtration of various liquids, such as beer,
wort, wine, juice of fruits, &c., in order to separate from said liquids the mechanically
suspended particles. For this purpose it is preferred to use plates or sheets f¹ pro-
vided with oblong holes, and covered with filtering cloth d¹ & e', said plates being
placed together in pairs, which are alternating with frames 7, r², provided with
openings b, c, for the passage of liquid into the filtering chamber. The oblong
holes of a pair of filtering plates cover each other for about half of their length, as
shown in Figure 9, so that the liquid takes the course indicated by arrows and drops
into a vessel placed at the bottoin of the press. Thereby the impurities are mainly
deposited in the filtering chambers on the cloths d¹, d, and the filtration is completed
by e, e', which retain the rest of the impurities. The frames r¹ as well as the plates
together with the filtering cloth can easily be taken out of the press and thoroughly
cleaned. An important feature of the Invention is the discharge of the filtered
liquid at the bottom of the filtering chambers as shown in the Drawings. All filter
plates are perforated in their covers with canals K, K, K,, and K,, which run through
the whole length of the press and communicate with the filtering chambers by
means of small channels. The two upper canals K, K₁, end at the fixed front plate
in a three way cock u, and the two lower canals K, and K, end in a three-way-cock
t which is provided with a regulating valve Y. The potential screw pressing ar-
rangement consists of the coarse-threaded screw spindle a working in the nut b,
which is attached to the cross piece c: A short screw spindle & firmly connected
with the coupling wheel e works in the nut f which is fixed in the movable endplate
g. The spindle a is provided at h with a turned groove into which fit pieces which
are attached to the coupling wheel e. The potential screw works as follows:-The
spindle a is turned by the handwheel i, and thereby the movable endpiece g pressed

page_text: against the filtering plates. The real tightening pressure is exerted by turning the
coupling wheel e in a direction opposite to the turning of the handwheel i by means
of a strong lever or stile placed into the respective openings of the wheel c. The
edulcoration by this press is carried out in the following manner:-The edulcorating
liquid enters through the three-way cock u into the canal K, and flows through the
small connecting channels in front of the press cakes contained in the various
pressing chambers, penetrates the cakes uniformly in consequence of the pressure
imparted to it by a high-level reservoir or by a force pump, escapes through the
canal K, to the three way-cock t, and from there through the regulating valve v.
By simply reversing the position of the cocks u and t the edulcorating liquid can be
sent through the press cakes and through the sediments in the opposite direction,
so that it flows through the cock u into the canal K, from there into the press cakes
and through the canal K, to the cock t, and escapes through the regulating valve v.
The valve v is constructed in the manner of a safety-valve, and has the important func-
tion to prevent the edulcorating water which has passed through the press cakes
from escaping directly into the air, and to allow the escape only by shifting a suit-
able weight in order to maintain always the required pressure of the liquid. This
arrangement is especially valuable if the press cakes contain substances which are.
only with difficulty soluble in water. The cock u contains besides the bores for the
passage of the liquid, perforations for the escape of air from the press, so that the
cock may serve for testing whether all spaces in the press are filled with water.
CLAIMS. 1. The power increasing or potential screw arrangement for filter presses,
consisting of a coarse-threaded screw spindle with nut and handwheel combined
with a short screw spindle and nut with corresponding thread, which is firmly
connected with a coupling wheel, substantially in the manner-as-described-and-
illustrated, and for the purpose-set forth. 2. The peculiar manner of inserting the
filtering material and its attachment; also the mode of tightening inside the filtering
chambers, substantially as and for the purpose as described and set forth. 3. The
combination of two filtering sheets with oblong holes, each of them being covered
on both sides with filtering cloth which, besides serving as a double filter, forms a
tight joint of the two sheets with each other and with the frame, together with the
frames forming the filtering chambers, substantially as described and illustrated.
The peculiar arrangement of the four canals formed by putting together all the
filter plates of the filterpress, with the alternately arranged small communicating
channels which allow the edulcorating water to enter at the top of the filtering press
to percolate through the pressed cakes, and to escape at the bottom of the press,
substantially in the manner as described and illustrated, and for the purpose set
forth.
4.
In witness whereof, I, the said Carl Kesseler, have hereunto set my hand and
seal, this Sixth day of June, A.D. 1879.
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