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Патент USA US2409228

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Oct. l5, 1946.
P. SCHLUMBOHM
2,409,226
DEVICE FOR VACUUM FILTMTIONv
Filed April 24, 1943
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2,499,226
Patented Get. 15, 1946
UNÃTED STATES PATENT OFFICE
2,409,226
DEVICE FOR VACUUM FILTRATION
Peter Schlumbohm, New York, N. Y.
'
Application April 24, 1943, Serial No. 485,264
7 Claims. (Cl. ,2N-162)
2
l
l The present invention refers to a ñltering
above the filter, t, 9, until the desired quantity
method and a filtering device, and more specifi
cally to a filtering device in which vacuum is
applied to force the liquid through a ñlter.
trate flask, l; after that, air may penetrate
through the filter, i3, 9, and break the vacuum.
The invention simplifies the creation of a vac
uum. In view of the application of vacuum filter
ple in Figure l, mainly by providing two separate
ing devices for making coffee, the invention made
will be applied also to this specific task., Inas
containers, one for the filtrate, as before, and one
for the total amount of the uniiltered liquid.
much as such vacuum coffee makers were so far
the simplest type of a vacuum filtering device I
may best refer to them, t0 show the difference
between them and the present invention.
My invention is illustrated by way of examples
partly in view and partly in sections, in Figure
1, Figure 2, and Figure 3, of the accompanying
drawing.
l
of filtrate, in this case coiîee, appears in the iil
The example in Figure 2 Varies from the exam
Furthermore, Figure 2 shows that the stopper, 2,
can be built with one bore only, and that the
check valve, 5, with its tube, 3, may branch off
from the channely S1, carrying later on the ñl
e. The container, iä, may be an old-fash
ioned coffee pot, which stands on a range over a
lill. Coffee would be made in this pot, I5,
by bringing the water, l5, to a boil, adding the
coilee grounds and extinguishing the darne, |41.
In Figure l, a iiltrate iiask, i, is equipped with
In the example shown, ï use a dip ñlter, l1, con
the stopper, 2, which has two bores. One bore
neet-ed by a tube7 it, to the tube 61, inserted in the
holds a tube,
with a check valve, 5; the other
bore, I3, takes the stem, 6, of a filter funnel, l. 20 stopper, 2, of the filtrate iiask, E. The procedure
in this case would be: After extinguishing the
In the example shown in Figure l, this ñlter fun
flame, lill, and allowing a few minutes for brew
nel is equipped with a filter plate, ß, which may
ing, the dip ñlter, il, is hung into the coiîee pot,
be of ceramics, and which may be supplemented
l5. and the name,
is ignited, to expel the »air
by a filter paper, il. The íilter funnel, l, is partly
filled
coiîee grounds, it. A water kettle, ll, 25 from the nitrate flask, l, by producing steam
is shown to indicate that boiling water may be
poured on the coffee grounds. The iiltrate ñask,
l, stands on a heating device, for instance, a gas
range, l2.
In operating this iiltering device I proceed as
folîows: A small quantity of water, I 3, is ñlled
into the filtrate flask, l, the coffee grounds, lll,
are put in their place, and the flame, le, is ignited.
Part of the water, i3, will be transformed into
steam and this steam will expel the air of the
ñltrate flask, i. The air will leave by the way of
least resistance through the check valve, 5.
While this goes on, I steep the coffee grounds,
it, by soaking them with a small quantity of boil
from water, i3. I may provide in this set-up an
additional check valve, le, which prevents the
steam to enter into tube F5. This check valve
would be so designed as to allow subsequently the
free new oi the liquid from tube 6 into the ñltrate
flask, l. However, the device is operative without
this check valve, i9. In the example, as shown
in Figure 3, such a check valve, §91 to prevent
now of steam from the ñltrate flask, I, through
tube t", towards the ñlter, S1, however, is a ne
eessity. The reason is that in this case the chan
nel for the air escape oiiers resistance. This
channel. is formed in this example by a valve-like
joint, 51, between the neck of the filtrate flask
ing water. This is done for reasons of its own, to 40 and the bottom of the ñlter funnel, l1.
open up the coiîee grounds. But in the present
set~up this also closes the way through tube E to
the air and steam which thus leave the filtrate
flask exclusively through tube 3.
Steam
evolved `from water, i3, must overcome the weight
of the filter funnel, '51, which functions in this
case like a safety valve.
Of course, the joint 51
must be well ground to provide an air-tight seal
After the air has been expelled I add more 45 during the condensation phase. I found it ad
vantageous to provide an annular cup, 2€), above
water to the coffee grounds, i5, and I extinguish
the joint proper. Steam condensed at the outer
the flame, ill’. This will result now in the forma
wall of ‘51, during the air expelling phase, will
tion of a vacuum in the iiltrate ñask, l, as the
supply seal-water for this cup, 20, and such water
check valve 5 prevents the outside air from enter
ing through tube 3. It means that the atmos- - will keep the surfaces of the joint, 51, wet, in
creasing their sealing capacity.
pheric pressure now forces the liquid above the
Comparing a colîee maker, as made by this
nit-er, 8, Q, through the iilter, with all the char
invention, with the usual vacuum coiïee maker,
acteristics of a vacuum ñltration. Of course, one
the principal difference seems to be that in the
has to follow up with adding new boiling water
old vacuum coiîee maker steam is produced to
from the kettle, H, to maintain the liquid seal
¿mazzo
3
4
displace water from the filtrate flask and to dis
place it through the same tube through which
being adapted to contain unfiltered liquid wherebii
the valve will be weighted.
it returns later on as filtrate.
5. A vacuum filtering device comprising a flask
for filtrate, a filtering element, communicating
means leading from said filtering element to said
filtrate flask, means for preventing the flow of
In the present in
vention, steam is produced to displace the air from
the filtrate flask. Furthermore, the air is dis
placed through a channel which is not identical
with the channel through which the filtrate flows
liquid from said filtrate flask through said com
from the filter to the filtrate flask.
This inven
municating means to said filtering element, means
tion has the advantage that the ñlter may be de
for communicating said filtrate flask directly to
the atmosphere and means responsive to the pres
sure within said filtrate flask for closing said
second communicating means, said last men
tioned means incorporating a valve construction
wherein the valve seat is formed by the mouth of
the filtrate flask and the valve is formed by the
bottom of the filtering element.
6. A vacuum filtering device comprising a flask
for filtering, a filtering element, communicating
means leading from said filtering element to said
filtrate flask, means for preventing the fiow of
liquid from said filtrate flask through said coni
municating means to said filtering element, means
signed purely to meet the requirements of the
filtering purposes, whereas, in the old devices, the
filter also had to meet the requirements of allow
ing passage of the water displaced from the fil
trate flask under very little pressure. The prac
tical consequence is that, in the present invention,
the filter may be much finer and smaller. For
instance, the present invention could operate with
the well known glass filters made from sintered
glass, 8, Il, 8’.
Having now described the nature of my inven- ~
tion and described, by way of examples, the man
ner in which it may be performed, I claim as my
invention:
1 l. A vacuum filtering device comprising a flask
for filtrate, a filtering element, communicating
means leading from said filtering element to said
filtrate flask, means for communicating said fil
trate flask directly to the atmosphere, and means
for communicating said filtrate flask directly to
the atmosphere and means responsive to the pres
_sui‘e within said filtrate flask for closing said
second communicating means, said last mentioned
means incorporating a valve construction wherein
the valve seat is formed by the mouth of the
filtrate flask, the valve is formed by the bottom
responsive to the pressure within said filtrate flask
for closing said second communicating means.
30 of the filtering element, and the valve is adapted
to be moved to open position under the influence
2. The structure recited in claim 1 and means
of vapor pressure within said filtrate flask and
associated with said first communicating means to
closed under the influence of gravity acting upon
prevent flow from said filtrate flask to said filter
the weight or mass of the filtering element.
ing element.
3. The structure recited in claim 1, said last 35 7. A vacuum filtering device comprising a flask
for filtrate, a filtering element, communicating
mentioned means comprising a valve construction
means leading from said filtering element to said
wherein the valve seat is formed by the mouth of
filtrate flask, means for preventing the flow of
the filtrate flask and the Valve is formed by the
fluid from said filtrate flask through said com
bottom of the filtering element.
municating means to said filtering element, means
4. The structure recited in claim 1, said last
for communicating said filtrate flask directly to
mentioned means comprising a valve construction
the atmosphere, and means responsive to the pres
wherein the valve seat is formed by the mouth of
sure within said filtrate flask for closing said
the filtrate flask and the Valve is formed by the
second communicating means.
bottom of the filtering element, said filtering ele
ment comprising a walled receptacle for unfil 45
PETER SCHLUMBOHM.
tered liquid and a filter, said walled receptacle
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