Europaisches Patentamt
J
»
European Patent Office
(11) Publication number: 0 2 8 0
Office europeen des brevets
EUROPEAN
345
B1
PATENT S P E C I F I C A T I O N
(45) Date of publication of patent specification :
02.10.91 Bulletin 91/40
(51) Intel.5 : A 4 7 J 3 1 / 4 0
(21) Application number : 88200127.4
Date of filing: 26.01.88
Device for the preparation of coffee.
(35) Priority : 24.02.87 NL 8700455
26.11.87 NL 8702837
(43) Date of publication of application :
31.08.88 Bulletin 88/35
© Publication of the grant of the patent :
02.10.91 Bulletin 91/40
(84) Designated Contracting States :
AT BE CH DE ES FR GB GR IT LI LU NL SE
73) Proprietor : De Erven de Wed. J. van Nelle B.V.
Van Nelleweg 1
NL-3044 BC Rotterdam (NL)
Inventor : Piscaer, Petrus Josephus Carolus
Struikheide 38
NL-3069 LJ Rotterdam (NL)
(74) Representative : Hoijtink, Reinoud et al
OCTROOIBUREAU ARNOLD & SIEDSMA
Sweelinckplein 1
NL-2517 GK Den Haag (NL)
(56) References cited :
US-A- 3 064 553
US-A- 3 103 873
US-A- 3 120 440
US-A- 3 300 094
US-A- 3 369 478
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Note : Within nine months from the publication of the mention of the grant of the European patent, any
the European patent granted.
person may give notice to the European Patent Office of opposition to
Notice of opposition shall be filed in a written reasoned statement It shall not be deemed to have been
filed until the opposition fee has been paid (Art 99(1) European patent convention).
Jouve, 18, rue Saint-Denis, 75001 PARIS
EP 0 280 345 B1
Description
The present invention relates to a device for the
preparation of coffee, comprising :
— a cylindrical container, the underside of which
is formed by an upward movable piston ;
— a filter which can be arranged on the container,
sealing the container at the top ;
— means for supplying ground coffee and water
towards an area directly above the container ;
Such a device is known from US-A-3.1 03.873.
During the preparation of a cup of coffee with this
known device, when the filter is moved away from the
container, a quantity of ground coffee is first conveyed
into the container via the opened top of the container.
Then a quantity of hot water is carried into the container, also through the opened top of the container.
. Only then does the ground coffee come into contact with the water.
When the two are combined, turbulences will
occur so that, despite the fact that coffee has a smaller
density than water, the ground coffee will not start
floating on the water. When the piston is moved
upward, the coffee will be distributed almost entirely
over the volume of the water. As a result not all the
ground coffee will come into contact with the water
that is flowing past. Because a great portion of the
ground coffee is in contact with the water for only a
short period of time, the coffee obtained will be relatively weak and will not taste very good.
The present invention therefore has for its object
to provide such a device whereby — using a given
quantity of ground coffee — a cup of coffee of proper
strength and good taste is prepared.
This aim is achieved by providing guiding means
for guiding the ground coffee and waterfrom the area
directly above the container in vertical direction into
said container, the guiding means being equipped to
mix coffee and water, and being provided with means
for suppressing the turbulence of ground coffee and
water during the outflow.
Since with such a device according to the present
invention hardly any turbulences will occur in the container, the ground coffee will come to float on the hot
water.
As the piston travels upward, all the water will be
pressed through the layer of ground coffee forming up
against the filter, so all the water has the opportunity
to come into contact with all the ground coffee. Coffee
prepared with this device therefore has the correct
strength and will taste good.
With a device according to the present invention,
the guiding means are equipped to mix the ground
coffee and water.
By this feature, the water is allowed to come into
contact with the ground coffee before it is conveyed
into the container, so that the contact-time between
water and coffee is prolonged and a better extraction
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of the coffee is obtained.
The current invention will subsequently be elucidated with reference to embodiments shown in the
annexed drawings. In the drawings :
figure 1 shows a perspective view partially broken
sway of a first embodiment of the present invention ;
figure 2 shows a perspective view partially broken
away of the filter holder and the associated drive
mechanism used in the first embodiment of the
present invention ;
figure 3 is a sectional view of the funnel applied
in this embodiment ;
figure 4 shows a perspective view partially broken
away of the cleaning member for the filter
employed in this embodiment ;
figure 5 is a perspective view of a preferred embodiment of a funnel according to the present invention ;
figures 6a-6f show schematic sectional views of
the device according to the present invention during the various stages of preparation of the coffee ;
figure 7 is a schematic cross-sectional view of a
second embodiment of the invention during the filling of the container;
figure 8 shows the embodiment depicted in figure
7 during the upward movement of the piston ; and
figure 9 shows the embodiment depicted in figure
7 during the siphon action of the outflow pipe.
The device for the preparation of coffee as shown
in figure 1 comprises a frame 1 to the front side of
which is attached a container 2, above which a container top plate 3 is arranged. Container 2 is closed off
on the underside by a piston 4 provided with a piston
wall 5 and a piston shaft 6, to which a piston rod 7 is
attached. Piston rod 7 is connected with a lever 8
which is driven by means of a drive mechanism 9,
shown with dashed lines, arranged in frame 1 to bring
about up and downward movement of piston 4.
Arranged above container 2 is a filter body 10
shown schematically in fig. 2. This filter body 10 comprises a filter holder 11., a front plate 12 and a rear
plate 13. Each of the plates 12, 13 is provided at its
top with two holes, to each of which is attached a
hinge mechanism 14. Each of the hinge mechanisms
14 consists of two arms 15, 16, each connected to
each other at one end for pivoting, and connected at
the other end respectively to one of the plates 12, 13
and to one of the shafts 17,18 attached to frame 1. A
pair of the arms 16 is firmly connected to shaft 18.
Arranged between one of the lower arms 15 and front
plate 12 is a draw spring 19. Also arranged on plate
12 is a projection 20, whereby draw spring 19 forces
arm 15 against projection 20 when the filter body 10
is located in its uppermost position.
Also arranged in filter body 10 next to filter 22 is
a passage opening 40. This opening serves to let the
EP 0 280 345 B1
mixture of ground coffee and water pass when the filter is situated in the uppermost position.
In order to move filter body 10 onto container 2,
shaft 18 is driven by means of a drive member 42, so
that the two arms 16 turn in an anti-clockwise direction. As a result the entire filter body 10 is moved in
the corresponding direction whereby draw spring 19
forces arm 15 against projection 20. This movement
continues until rear plate 13 strikes against a rib 21
attached to frame 1. This rib 21 prevents rear plate 13,
and thereby the entire filter body 10, moving in sideways direction, so that after running up against rib 21 ,
filter body 10 is only moved downward, whereby,
counter to the tractive force of draw spring 19, arm 15
is moved away from projection 20. In this way is
achieved that the filter body 10 approaches container
2 directly from above.
Filter holder 11 comprises a filter22 arranged therein and a liquid collecting chamber 23 connected to
an outflow pipe 24. Further a packing ring 25 is
arranged around filter 22.
When a cup of coffee has just been made and the
piston 4 is in its upper position, a layer of coffee
grounds will be located between piston 4 and filter 22.
This layer of coffee grounds must of course be
removed.
Provided for this purpose is a slide 27 which is
furthershown in fig. 4 and which is connected to frame
1 by means of a pair of rods 28. These rods 28 form
a parallelogram mechanism which is driven by a drive
mechanism 59 by means of a rod 29. When driven by
drive mechanism 59, slide 27 performs a movement
over container upper plate 3 such that the quantity of
coffee grounds present on the upper side of the piston
is wiped off it and drops to the side of the upper plate
of the container.
Above container 2 a funnel 30 shown perspectively in fig. 1 is firmly attached to frame 1. Funnel 30
comprises a conical part 31, a cylindrical part 32
arranged above it and an outflow pipe 33 placed
beneath the conical part. The angle of slope of the
conical part preferably amounts to approximately 30
degrees, the diameter of the outflow opening is preferably 8 mm, while the angle of slope of the outflow
pipe amounts to approximately 2 degrees. Running
out into the cylindrical part 32 of the funnel is a water
feed pipe 34 and also connected is a pipe 35 for the
discharge of steam. Water feed pipe 34 runs out into
cylindrical part 32 such that the water will perform a
swirling movement. Placed on the top of cylindrical
part 32 is a cover 36 provided with a feed tube 37 for
the supply of ground coffee which is arranged concentrically in relation to the funnel. Cover 36 is also provided with a channel 38 running out into feed tube 37
for the supply of coffee.
Figure 3 shows a section of funnel 30 which
shows that the funnel is provided with a partition 39
arranged in the interior of conical part 31 of funnel 30
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and extending in vertical direction. It is of course possible to provide the funnel with a larger number of partitions 39. The partition is formed such that the inner
edge of the partition extends flush with the inner wall
of the outflow pipe. The partition is rounded off at the
top. When the water flows through the funnel 30, the
partition suppresses the swirling of the water, so that
the water as well as the ground coffee supplied from
above travel through outflow pipe 33 into container 2
without any turbulence. As a result, the ground coffee
will float on top of the water when the water and the
coffee are located in container 2.
In the case of the funnel as shown in figure 5, two
partitions 43 are arranged in its conical part. These
partitions 43 also serve to suppress the swirling of the
water that is flowing through.
The working of the device according to the current
invention will now be described with reference to the
figures 6a-6f.
The piston 4 is, as shown in figure 6a, initially
located in the lower position. Filter body 10 is at this
point situated in its uppermost position. A quantity of
water is then supplied by water feed pipe 4 which falls
into funnel 30 and drops through outflow pipe 33 into
container 2. The water thereby drops through opening
40 arranged in filter body 10. This opening is dimensioned such that the drop of the water and of the
ground coffee is not disturbed. After a small quantity
of water has been conveyed into container 2, whereby
as a result of the debouchment of water feed conduit
line 34 the water will begin to swirl in the cylindrical
part 32 of the funnel, a quantity of ground coffee is carried out of coffee storage container 41 , the trough-like
channel 38 and feed pipe 37 for coffee into the funnel
30, whereby the supply of water remains continuous.
As a result of the turbulence of the water, a close contact between water and coffee will occur so that extraction is improved. The mixture of water and ground
coffee thus resulting flows along partitions 39, 43,
which causes the turbulences to be suppressed, and
moves further through outflow pipe 33 and through
opening 40 into filter body 10 into container 2. During
the passage of the water through funnel 30, the turbulences are suppressed by partitions 39, 43 so that
the mixture of water and ground coffee is carried perpendicularly into container 2. Because of the absence
of turbulence the ground coffee will come to float on
top of the water. This is shown in figure 6b. After the
supply of ground coffee has been stopped the supply
of water is continued for a further time to wash out of
the funnel any ground coffee that may have been left
behind.
When the supply of water and ground coffee is
completed, filter body 10 is moved above container 2,
as shown in fig. 6c.
The piston 4 will subsequently be moved upward
and the water present in container 2 will be suppressed through the layer of coffee forming up against the
EP 0 280 345 B1
filter and through the filter into collecting chamber 23,
and from there into outflow pipe 24. A quantity of coffee grounds will then remain in the container, as
shown in fig. 6d. The movement of piston 4 continues
however, until the upper face of this piston is located
in the place of container holder 3, as shown in fig. 6e.
The filter body 10 is hereby moved upward by the coffee grounds. The slide 27 will then move through between the upper side of the piston and the underside
of the filter to shift away the coffee grounds present
there, as shown in fig. 6f. When this operation is completed, the piston and slide 26 return to their starting
position and the cycle can start again.
In figs. 7, 8 and 9 another embodiment of the present invention is depicted, which aims to solve the
problem as described below :
According to the first embodiment of the present
invention the water present in the container is pressed
through the layer of coffee grounds developing
against the filter and through the filter during the
upward movement of the piston. The coffee (drink)
thus produced is being drained through a pipe and
being supplied to a cup. The output opening of this
drain has to be below the level of the container to
obtain a siphon action so that the coffee is drained to
its full extend and the residue of coffee grounds leaving behind is as dry as possible.
In practice this appears to present problems as
often liquid is remaining in the space above the filter,
which liquid moistens the coffee grounds being present below the filter, so that these can be disposed on
only with difficulty during the next step. Also not all
prepared coffee (drink) is conveyed to the cup.
According to this second embodiment a valve is
provided in one wall of the chamber, which valve connects the chamber with the surroundings, and which
closes when the pressure being present in the chamber is higher than the pressure of the surroundings,
and which valve is open otherwise.
By these measures the valve is kept in its closed
position during the upward movement of the piston so
that the liquid pressed through the coffee grounds and
the filter is drained fully through the pipe. When the
piston has reached its upper position the pressure in
the chamber will be lowered, as caused by the siphon
action of the pipe, so that the valve opens and the
liquid remaining in the chamber is disposed of as
much as possible. The opened valve takes care of the
supply of the volume of air, which had been taken in
by the liquid.
Subsequently this will be illucidated. Apart from
the parts already described together with the first
embodiment, the second embodiment comprises a
collection chamber 45, at the lower end of which a filter 46 is provided. This chamber 45 has been provided movably, so that this chamber car be moved
from the position depicted in fig. 7 during the supply
of coffee and water to a position, as depicted in fig. 8,
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wherein the water is pressed through the filter 46 into
the chamber 45. The driving means required hereto
have not been depicted in the drawings. By means of
a pipe 47 the chamber 45 is connected with a outflow
hose 48.
The chamber also comprises a valve 49. This
valve has been provided in the upper wall 50 of the
chamber, which comprises a substantially cylindrical
guide element 51. A stem 52 stretches through the
opening of the guide element 51. To the lower end of
the stem 52 a plate 53 has been provided, which is
substantially perpendicularto the direction of the stem
52. This saucer, together with the stem 52 connected
thereto, has beer located such, that the stroke thereof
is being limited by a perforated wall 54 provided at the
lower end thereof. On its top the plate 53 comprises
an annular ring 55.
Otherwise this second embodiment differs from
the first embodiment by the lack of a passage opening
in the filter body 10. In the case of this embodiment
the hinge system will differ in so far that during the filling of the container the jet emanating from the funnel
33 passes the chamber 5.
Subsequently the action of this embodiment will
be described.
In the situation shown in fig. 7 the chamber 45 is
located next to the top of the container 1. From the
outflow pipe 33 located above the container 2 a mixture of heated water 56 and coffee grounds 57 flow into
the container 2, which is closed to its lowerside by the
piston 4.
Subsequently the chamber 45 is moved until it is
on top of the container 2 by means of conveying
means not depicted in the drawings. The resulting
situation has beer depicted in fig. 8. Afterwards the
piston 4 moves upwards, pressing the water 56
through the layer of coffee grounds 57 developing
against the filter 46 into the chamber 45. The liquid
(coffee) collecting in the chamber 45 then drains off
through the pipe 47 and the outflow hose 48 in a cup
not depicted. As a result of the pressing action of the
piston 4 the valve 49 is closed.
When the piston 4 has reached its upper position,
is
as depicted in fig. 9, the pressure prevailing in the
chamber 45 will be equal to the pressure prevailing in
the surroundings as a consequence of the deletion of
the pressure in the chamber 45 and the draining of the
coffee liquid 58. Then the valve 49 will open, so that
air can flow between the stem 52 and the guide element 51 through the perforations in the perforated
wall 54, so that the amount of coffee 58 remained in
the chamber 45 can also drain through the pipe 47
and the hose 48. Thus the coffee grounds 57 will be
dry as these will not be moistured by a rest of coffee
left behind in the chamber 45.
Subsequently the chamber 45 is moved to its initial position and the dry coffee grounds are wiped off
from the top of the piston 4 by means of a wiper 27,
EP 0 280 345 B1
after which the cycle can start again.
Claims
1. Device for preparation of coffee, comprising :
— a cylindrical container (2), the underside of
which is formed by an upward movable piston (4) ;
— a filter (1 0) which can be arranged on said container (2), sealing said container (2) at the top ;
— means (38, 41 ; 34) for supplying ground coffee and water towards an area directly above said
container (2) characterized by guiding means
(30) for guiding the ground coffee and water from
the area directly above the container in vertical
direction into said container (2), the guiding
means (30) being equipped to mix coffee and
water, and being provided with means for suppressing the turbulence of ground coffee and
-water during the outflow.
2. Device as claimed in claim 1, characterized in
that the guiding means (30) are formed by a funnel
(31 , 32) arranged above the container with an outflow
pipe (33) directed vertically downward.
3. Device as claimed in claim 2, characterized in
that the funnel (31, 32) is provided with at least one
internal partition (39) extending in radial direction.
4. Device as claimed in claim 2, characterized in
that the funnel (31, 32) is provided with two partitions
(43) extending at right angles to each other and
across the whole diameter of the funnel.
5. Device as claimed in claim 2, characterized in
that the funnel (31, 32) is provided with at least one
partition (39) extending from the funnel wall toward
the interior, which partition (39) extends inward as far
as the inner wall of the line of the outflow pipe (33).
6. Device as claimed in claim 5, characterized in
that a feed pipe (37) for ground coffee extends from
above into the funnel (31, 32) and that the internal
diameter of the outflow opening of said feed pipe (37)
is equal to the internal diameter of said funnel at the
point of the upper wall of the at least one partition (39).
7. Device as claimed in any of the claims 2-6,
characterized in that the funnel (31, 32) is circular
symmetrical, and has a conical wall, that the angle of
slope of the conical wall (31) amounts to approximately 30 degrees, that the outflow pipe (33) is conical,
the wall has an angle of slope of 2 degrees and that
the diameter of the outflow opening amounts to
approximately 8 mm.
8. Device as claimed in any of the claims 2-7,
characterized in that at a level lying below the outflow opening of the coffee (37), a water feed pipe (34)
runs out into the funnel (31, 32).
9. Device as claimed in any of the claims 2-8,
characterized in that the water feed pipe (34)
extends tangentially relative to the funnel (31, 32),
and that the axial line of the funnel extends at a dist-
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ance of approximately 14 mm from the axial line of the
container (2).
10. Device as claimed in one of the claims 2-9,
characterized in that a filter member (1 1) is disposed
between the container (2) and the funnel (31, 32),
which filter member (11) can be moved into two positions and which is provided with an opening (40),
that in the upper position of the filter member (1 1)
the opening is located beneath the outflow pipe
(33),
that the diameter of the opening (40) is greater
than the opening of the outflow opening (33),
and that the filter member (1 1) is movable until to
and from the upper rim (3) of the container, wherein said movement has both a horizontal and a
vertical movement.
11. Device according to one of the preceding
claims, characterized in that the filter (22) is a part
of the chamber (45) positionable on top of the container (2), which chamber (45) comprises a drain
channel (47) directed downwards, and in that a valve
(49) is provided in one wall of the chamber (45), which
valve (49) connects the chamber (45) with the surroundings and which valve (49) closes when the
pressure prevailing in the chamber (45) is higher than
the pressure prevailing in the surroundings and which
is opened otherwise.
12. Device according to claim 11, characterized
in that the valve (49) is a mechanical valve.
13. Device according to claim 12, characterized
in that the valve (49) has been arranged in the upper
wall (50), extending substantially horizontally of the
chamber,
that the valve (49) is a substantially horizontally
plate (53) and a stem (52) fixed thereto, which plate
(53) is movable substantially in vertical direction
along the upper wall (50) of the chamber and a perforated wall (54), provided thereunder, in which the
stem (52) is being guided in a guide element (51),
fixedly connected with the upper wall (50) of the
chamber.
14. Device according to claim 13, characterized
in that a seal of a flexible material (55) is provided between the saucer (53) and the upper wall (50) of the
chamber.
15. Device according to claim 13 or 14, characterized in that the saucer (53) is provided with a thickening at its lower side.
Patentanspruche
1. Vorrichtung zur Zubereitung von Kaffee mit
— einem zylindrischen Behilter (2), dessen
Unterseite durch einen nach oben bewegbaren
Kolben (4) ausgebildet ist ;
— einem Filter (10), derauf dem Behalter (2) angeordnet und diesen an der Oberseite abdichten
EP 0 280 345 B1
kann ;
— Einrichtungen (38, 41 ; 34) zurZufuhr gemahlenen Kaffees und Wassers in Richtung eines
Bereiches direkt oberhalb des Behalters (2),
gekennzeichnet durch
Fuhrungseinrichtungen (30) zur Fuhrung des
gemahlenen Kaffees und des Wassers in vertikaler Richtung aus dem Bereich direkt oberhalb des
Behalters in den Behalter (2), wobei die Furungseinrichtungen (30) so ausgestaltet sind, daB sie
Kaffee und Wasser mischen und mit Einrichtungen zur Unterdriikkung des Wirbels von gemahlenem Kaffee und Wasser wahrend des
Ausstromens versehen sind.
2. Vorrichtung nach Anspruch 1, dadurch
gekennzeichnet, daB die Fuhrungseinrichtungen (30)
durch einen Trichter (31, 32) ausgebildet sind, der
oberhalb des Behalters angeordnet ist und ein Ausflu6rohr(33) aufweist, das vertikal nach unten gerichtet ist.
3. Vorrichtung nach Anspruch 2, dadurch
gekennzeichnet, daB der Trichter (31, 32) mitwenigstens einer inneren Wandung (39) versehen ist, die
sich in radialer Richtung erstreckt
4. Vorrichtung nach Anspruch 2, dadurch
gekennzeichnet, daB der Trichter (31, 32) mit zwei
Wandungen (43) versehen ist, die sich unter rechten
Winkeln zueinander und uber den gesamten Durchmesser des Trichters erstrecken.
5. Vorrichtung nach Anspruch 2, dadurch
gekennzeichnet, daB der Trichter (31 , 32) mit wenigstens einer Wandung (39) versehen ist, die sich von
der Trichterwandung in Richtung des Innenraums
erstreckt und sich soweit nach innen erstreckt, wie die
Innenwand der Leitung des AusfluBrohres (33).
6. Vorrichtung nach Anspruch 5, dadurch
gekennzeichnet, daB ein Zufuhrrohr (37) fur gemahlenen Kaffee sich von oben in den Trichter (31, 32)
erstreckt und daB der Innendurchmesser der AusfluBoffnung des Zufuhrrohres (37) gleich dem Innendurchmesser des Trichters am Ort der oberen Wand
derwenigstens einen Wandung (39) ist.
7. Vorrichtung nach wenigstens einem der
Anspruche 2 bis 6, dadurch gekennzeichnet, daB der
Trichter (31, 32) kreissymmetrisch ist und eine konische Wand (31) hat, deren Neigungswinkel etwa 30
Grad betragt,
daB das AusfluBrohr (33) konisch ist, deren Wand
einen Neigungswinkel von 2 Grad hat und
daB der Durchmesser der AusfluBSfmung etwa 8 mm
betrigt.
8. Vorrichtung nach einem der Anspruche 2 bis 7,
dadurch gekennzeichnet, daB bei einem unterhalb
der AusfiuBoffnung des Kaffees (37) liegenden
Niveau ein Wasserezufuhrrohr (34) in den Trichter
(31,32)verlauft.
9. Vorrichtung nach einem der Anspruche 2 bis 8,
dadurch gekennzeichnet, daB das Wasserzufuhrrohr
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(34) sich relativ zu dem Trichter (31, 32) tangential
erstreckt und daB sich die Achslinie des Trichters urn
einen Abstand von etwa 14 mm von der Achslinie des
Behalters (2) erstreckt.
10. Vorrichtung nach einem der Anspruche 2 bis
9, dadurch gekennzeichnet, daB ein Filterteil (1 1) zwischen dem Behalter (2) und dem Trichter (31, 32) angeordnet ist, und das Filterteil (1 1) in zwei Stellungen
bewegt werden kann und mit einer Offnung (40) versehen ist,
daB in deroberen Stellung des Filterteiles (1 1) die
Offnung unterhalb des AusfluBrohres (33) angeordnet ist,
daB der Durchmesser der dffnung (40) groBerals
die Offnungder AusfiuBoffnung (33) ist und
daB das Filterteil (1 1) bis hin zur und von der oberen Leiste (3) des Behalters weg bewegbar ist,
wobei die Bewegung sowohl eine horizontale als
auch eine vertikale Bewegung umfaBL
11. Vorrichtung nach einem der vorstehenden
Anspruche, dadurch gekennzeichnet, daB das Filter
(22) ein Teil der auf der Oberseite des Behalters (2)
anordenbaren Kammer (45) ist, die Kammer (45)
einen nach unten gerichteten AbstrSmkanal (47)
umfaBt und daB ein Ventil (49) in einer Wand der
Kammer (45) vorgesehen ist und dieses Ventil (49)
die Kammer (45) mit der Umgebung verbindet, wobei
das Ventil (49) schlieBt, wenn der in der Kammer (45)
herrschende Druck hoher als der in der Umgebung
herrschende Druck ist und unter anderen Bedingungen offnet.
12. Vorrichtung nach Anspruch 11, dadurch
gekennzeichnet, daB das Ventil (49) ein mechanisches Ventil ist.
13. Vorrichtung nach Anspruch 12, dadurch
gekennzeichnet, daB das Ventil (49) in der oberen
Wand (50) angeordnet ist und sich im wesentlichen
horizontal zu der Kammer erstreckt,
daB das Ventil (49) eine im wesentlichen horizontale
Platte (53) und eine daran befestigter Schaft (52) ist,
wobei die Platte (53) im wesentlichen in vertikaler
Richtung entlang deroberen Wand (50) der Kammer
und einer daruntervorgesehenen, perforierten Wand
(54) bewegbar ist, in der der Schaft (52) in einem Fflhrungselement (51) gefuhrt wird, das fest mit der oberen Wand (50) der Kammer verbunden ist
14. Vorrichtung nach Anspruch 13, dadurch
gekennzeichnet, daB eine Dichtung aus fiexiblem
Material (55) zwischen der Schale (53) und der oberen Wand (50) der Kammer angeordnet ist.
15. Vorrichtung nach Anspruch 13 Oder 14,
dadurch gekennzeichnet, daB die Schale (53) an ihrer
Unterseite mit einer Verdickung versehen ist.
Revendications
1. Appareil de preparation de cafe, comprenant :
6
11
EP 0 280 345 B1
— un recipient cylindrique (2) dont la face inferieure est formee d'un piston (4) mobile vers le
haut,
— un filtre (10) qui peut §tre place surle recipient
(2) et qui ferme le recipient (2) de maniere etanche a sa partie superieure, et
— un dispositif (38, 41 ; 34) destine a transmettre
du cafe moulu et de I'eau vers une region qui se
trouve juste au-dessus du recipient (2), caracterise par un dispositif (30) de guidage du cafe
moulu et de I'eau de la region qui se trouve juste
au-dessus du recipient en direction verticale dans
le recipient (2), le dispositif de guidage (30) etant
equipe afin qu'il melange le cafe et I'eau, et
comprenant un dispositif destine a supprimer la
turbulence du cafe moulu et de I'eau pendant
I'ecoulement
2. Appareil selon la revendication 1, caracterise
en ce que le dispositif de guidage (30) est forme par
un entonnoir (31, 32) place au-dessus du recipient, et
ayant un tube de sortie (33) dirige verticalement vers
le bas.
3. Appareil selon la revendication 2, caracterise
en ce que I'entonnoir (31 , 32) a au moins une cloison
interne (39) disposee en direction radiale.
4. Appareil selon la revendication 2, caracterise
en ce que I'entonnoir (31 , 32) a deux cloisons (43) qui
sont perpendiculaires I'une a I'autre et disposees suivant tout le diametre de I'entonnoir.
5. Appareil selon la revendication 2, caracterise
en ce que I'entonnoir (31 , 32) a au moins une cloison
(39) allant de la paroi de I'entonnoir vers I'interieur,
cette cloison (39) etant dirigee vers I'interieur jusqu'a
la paroi interne de la canalisation formee par le tube
de sortie (33).
6. Appareil selon la revendication 5, caracterise
en ce qu'un tube d'alimentation (37) en cafe moulu
penetre par le haut dans I'entonnoir (31 , 32), et en ce
que le diametre interne de I'ouverture de sortie du
tube d'alimentation (37) est egal au diametre interne
de I'entonnoir a ('emplacement de la paroi superieure
de la cloison au moins (39).
7. Appareil selon I'une quelconque des revendications 2 a 6, caracterise en ce que I'entonnoir (31,
32) a une forme circulaire symetrique, et a une paroi
conique, en ce que Tangle d'inclinaison de la paroi
conique (31) est a peu pres egal a 30°, en ce que le
tube de sortie (33) est conique, sa paroi ayant un
angle d'inclinaison de 2°, et en ce que le diametre de
I'ouverture de sortie est approximativement egal a 8
mm.
8. Appareil selon I'une quelconque des revendications 2 a 7, caracterise en ce que, a un niveau qui
se trouve au-dessous de I'ouverture de sortie du cafe
(37), un tube (34) d'alimentation en eau debouche
dans I'entonnoir (31, 32).
9. Appareil selon I'une quelconque des revendications 2 a 8, caracterise en ce que le tube (34) d'ali-
5
10
15
20
25
30
35
40
45
so
55
12
mentation en eau est dispose tangentiellement par
rapport a I'entonnoir' (31, 32) et en ce que I'axe de
I'entonnoir est a une distance d'environ 14 mm de
I'axe du recipient (2).
10. Appareil selon I'une des revendications 2 a 9,
caracterise en ce qu'un organe de filtration (11) est
place entre le recipient (2) et I'entonnoir (31, 32), cet
organe de filtration (11) peut etre deplace dans deux
positions et ayant une ouverture (40),
en ce que, dans la position superieure de I'organe
de filtration (11), I'ouverture est placee sous le
tube de sortie (33),
en ce que le diametre de I'ouverture (40) est
superieur au diametre de I'ouverture de sortie
(33), et
en ce que I'organe de filtration (1 1) est mobile en
translation par rapport au rebord superieur (3) du
recipient, ce deplacement ayant a la fois une
composante horizontale et une composante verticale.
11. Appareil selon I'une quelconque des revendications pr6c§dentes, caracterise en ce que le filtre
(22) constitue une partie de la chambre (45) qui peut
itre plac6e sur le recipient (2), la chambre (45)
comprenant un canal d'evacuation (47) qui est dirige
vers le bas, et en ce qu'une soupape (49) est placee
dans une paroi de la chambre (45), cette soupape
(49) reliant la chambre (45) au milieu environnant et
la soupape (49) se fermant lorsque la pression dans
la chambre (45) est superieure a la pression environnante, la soupape etant ouverte dans les autres situations.
12. Appareil selon la revendication 11, caracterise en ce que la soupape (49) est de type mecanique.
13. Appareil selon la revendication 12, caracterise en ce que la soupape (49) a ete placee dans la
paroi superieure (50) qui est sensiblement horizontale par rapport a la chambre, et
la soupape (49) est une plaque sensiblement horizontale (53) ayant une tige (52) qui lui est fixee, la plaque
(53) etant mobile pratiquement en direction verticale
le long de la paroi superieure (50) de la chambre et
d'une paroi perforce (54) placee au-dessous, la tige
(52) etant guidee dans un element (51) de guidage
raccorde a demeure a la paroi superieure (50) de la
chambre.
14. Appareil selon la revendication 13, caracterise en ce qu'un joint d'etancheite forme d'un materiau
souple (55) est place entre le godet (53) et la paroi
superieure (50) de la chambre.
15. Appareil selon "la revendication 13 ou 14,
caracterise en ce que le godet (53) a un epaississement a sa face inferieure.
EP 0 280 345 B1
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36
FIG.1
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FIG.
4
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F I G . 6 c
R G . 6 f
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