DE8815626U1 - Filter device for producing aromatic extracts from coffee, tea or similar. - Google Patents

Description

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Professional representatives before the European Patent Office

DiPL-PHYS, BUSE -DiPL-PHYS, MENTZEL · dipl-INg, LUDEWIG Urttifdöfnini 114' Pöitfach 200210«5600 Wuppertal 2 < Telephone (0202) 557022/23/24 · Telex 8591606 Wpat · Fax 0202/571501

89 5600 Wuppertal 2, the

Password&iacgr; Double Suction Lifter

Company Robert Krups Stiftung & Co. KG ₁ , Heresbachstr. 29,

565o Solingen 19

Filter device for producing aroma extracts from coffee, tea or the like,

The invention relates to a filter device for producing aroma extracts from coffee, tea or the like, consisting of a filter vessel, a filter bag that can be placed therein and with several outlets, in which the filter vessel has a first outlet designed as a suction lifter and a second outlet designed as a main outlet, which lies with its inlet opening above the suction lifter and whose effective cross-sectional area is significantly larger than that of the suction lifter.

Such a filter device is known from DE-U 86 o3 153.8. When using this known filter device to produce aroma extracts from coffee, tea or similar, the siphon is initially effective because its overflow edge is arranged relatively low, so that the siphon starts to run even when the liquid in the filter vessel is only a small amount. In the known filter device, this siphon initially works alone. This means that the filtrate flows out via its outlet. However, when the liquid level in the filter device rises higher, it finally reaches the inlet opening of the main outlet. From this moment on, they work in parallel.

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of the two outlets, whereby the flow rate in the area of the main outlet is considerably greater than in the area of the outlet opening of the siphon. This parallel operation of the two outlets continues until the liquid level falls below the lower edge of the inlet opening of the main outlet. If this happens, no more filtrate leaves the outlet opening of the main outlet. Instead, the ^siphon then works alone again. Tests have shown that then a constant flow rate is required for a coolant discharge.

without interrupting the filtrate flow -*. Only a residual filtrate remains in the coffee sump, which prevents any spillage when the machine is removed backwards or the siphon starting up again. In this respect, such filter devices have proven themselves well in practice.

Problems can arise, however, when this known filter device is used in conjunction with powerful coffee machines and when only a small amount of filtrate, e.g. one or two cups, is to be produced. It must be taken into account that the main output is a certain amount of filtrate on the coffee machine's

~\ filter holder. This is necessary in order to ensure a sufficiently long contact time when preparing small amounts of filtrate in high-performance coffee machines or similar. The main outlet cannot therefore be placed lower because the contact time would then be too short when preparing small amounts of filtrate. The relatively high arrangement of the main outlet then results in the problem that the outlet of the siphon, which has a small cross-section, requires a relatively long time to empty the remaining liquid.

This is where the invention comes in. It aims to create filter devices for producing aroma extracts from coffee, tea or similar

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The invention further improves the type described in more detail at the outset, in particular in such a way that the advantages of the known embodiment of the filter device remain, but that the time for draining off the residual liquid is significantly reduced in comparison with the known embodiment.

To solve this problem, the invention proposes

^ also the main outlet of the filter device as a suction lifter

jj£. With such a design of the filter device

This results in a significant improvement compared to the known system. The overflow edge of the suction lifter used as the main outlet can be positioned at a relatively large distance from the bottom of the filter carrier, so that a correspondingly large amount of liquid can collect in the filter before the overflow is reached. This means that a relatively

^s long contact time available. On the other hand,

^ the flow of liquid from the main outlet does not

occurs when the liquid level in the filter device falls below the overflow edge of the main outlet, because

&ldquo; the main outlet according to the invention now also functions as a suction lifter

! is formed, the filtrate flows out of the two outlets of the filter device side by side until the liquid level falls below the inlet opening of the main outlet. Only then does the

.. filtrate flow from the main outlet. This arrangement

i-i thus only a relatively small amount of

small residual amounts, which can then be removed by the smaller suction lifter in a relatively short time. Thus, the use of two suction lifters in the arrangement mentioned in accordance with the invention ensures that, even when producing a small amount of filtrate, for example one or two cups, a sufficiently long contact time remains. On the other hand, the removal of the residual amounts takes place

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quantity in a much shorter time than with the known filter device in which the main outlet is designed as a simple pipe.

In one embodiment of the invention, it is proposed that the two suction lifters arranged at the bottom of a chamber of the filter device each consist of a nozzle with a continuous bore and an upper part that can be placed on it. On the one hand, there is the possibility of assigning an attachable upper part to each nozzle ^s . On the other hand, However, it is also possible to assign a common upper part, preferably designed as a snap-on cap, to the two suction lifters of the filter device. By attaching the snap-on cap, both nozzles of the two suction lifters are then covered.

It is recommended that the upper parts or the cap be positioned on the nozzle so that they can be changed in position to change the distance between the suction opening of the suction lifter and the floor. If separate upper parts are used for the nozzles, the distance between the outlet openings of the two suction lifters can be varied, while it remains constant when using a common cover cap. The production of a common cap is therefore more economical than the production of two separate upper parts that have to be put on the nozzles.

A simple clamp connection is sufficient to ensure the desired position of the upper parts or the push-on cap on the nozzle 7u. If required, a locking connection can also be used. The nozzles and the adjacent walls of the upper parts or the push-on cap can then be provided with locking devices and threads in a generally known manner.

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These can be molded directly into the upper parts or the snap-on cap during production.

It is recommended that the two nozzles of the suction lifter have a common wall in some areas. One of the advantages of this is that the upper end of the common wall of the nozzles can be used as a stop for the push-on cap. The push-on cap can therefore only be pushed onto the nozzles up to this stop. In this one end position, the overflows of both nozzles remain open.

A further embodiment of the invention provides for areas of the nozzles to be designed as an extension below the bottom of the chamber. With this design of the filter device, the nozzles are therefore partly inside the chamber of the filter device, but partly outside.

This also makes it possible to arrange the extension outside the longitudinal center line of the filter device. The extent to which the extension is off-center can be varied. This makes it possible to adapt to different coffee machines, because the collecting jug can be arranged in different positions on a stand or similar on the coffee machine.

For economic reasons, it is recommended that the suction lifter nozzles, including their extensions, be molded directly onto the bottom of the chamber. This avoids an additional connection between the suction lifter parts and the filter device, and sealing problems also do not arise.

In another embodiment of the invention, it is provided that the two suction lifters of the filter device are arranged in a recess in the wall of the filter carrier. The dimensions

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The recess is adapted to those of the suction cups to be accommodated in it.

It is recommended that the suction lifters form a one-piece, approximately U-shaped tubular body in a manner known per se, the holes of which have cross-sectional areas of different sizes and the inlet openings of which are arranged at different heights in relation to the base of the filter device.

This embodiment of the invention makes it possible to move the filter outlet into the longitudinal center line of the filter device or the filter carrier.

The invention is shown in several embodiments in the drawing, namely:

Fig. 1 a cross section through a first embodiment

a filter device according to the invention for producing aroma extracts from coffee, tea or the like,

Fig. 2 a section through the filter device according to

Fig. 1 along the line H-II, partially broken away,

Fig. 3 a partial section, partially broken away, through the filter device according to Fig. 1 in a modified position of the plug-on cap in relation to the nozzles of the suction lifter,

Fig. 4 a cross section through a second embodiment of a filter device according to the invention, partially broken away and

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Fig. 5 partly in section, partly in view, the two suction lifters used in the filter device according to Fig. 4 on an enlarged scale.

First of all, it should be mentioned that the filter device according to the invention for producing aroma extracts from coffee, tea or the like can be used in known coffee or tea machines. The filter device can also be a component of such a coffee or tea machine in a known manner.

The filter device, generally designated γ, is known in its structure. In the selected embodiment, it is made in one piece from a plastic. A filter bag 13 is placed in the funnel-shaped interior of the filter vessel 11 and is held at a distance from the base of the filter vessel 11 by ribs 12 on the inner wall of the filter vessel 11.

The filter vessel is provided with a base 14 at the bottom. The filter vessel 11 can optionally have a circumferential support flange on the lower surface. With the help of such a flange, the filter device 10 can be placed in a known manner on a collecting vessel, such as a jug, a pitcher or the like.

According to the embodiment of the filter device according to Fig. 1 of the drawing, the filter vessel 11 has a chamber 24 which projects out to the side and in the area of which the outlets for the filtrate to be produced, e.g. coffee filtrate, are arranged. The chamber 24 has a flat bottom 25 which is flush with the bottom 14. In the area of the bottom 25, the outlets of the filter device are located next to one another in a manner to be specified! ¹ .

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The ^first outlet is the suction lifter 17" _which has a known design. In the selected embodiment, it is designed in two parts and consists of a support 19 which is formed on the bottom 25 of the chamber 24 and the lower area of which has the outlet opening 21. The nozzle 19 has a continuous bore 31. The nozzle 19 is partly inside the chamber 24, partly outside. The outside area is an extension 34 of the south 25. The suction lifter 17 has an upper part which is attached to the nozzle 19. The upper part is attached to the nozzle while leaving an overflow 2o. This allows the filtrate to pass through the suction opening 18 into the overflow 2o. From there it then flows through the bore 31 of the nozzle 19 until it leaves it through the outlet opening 21. The filtrate flowing out is then collected in a known manner by a vessel underneath.

In the embodiment of the filter device according to Fig. 1 of the drawing, there is a further suction lifter, designated 16, next to the suction lifter 17 and which forms the main outlet. This second suction lifter 16 also has a nozzle 27, which is penetrated in its longitudinal direction by a bore 3o, at the lower end of which the outlet opening is located.

29. At the top, the bore 3o opens into the overflow 26. The nozzle 27 of the second suction lifter 16 is also assigned an upper part, which can be placed on the nozzle 27 in such a way that the overflow remains free. The inlet opening of the second suction lifter 16 is designated 28.

In the selected embodiment according to Fig. 1 of the drawing, the two upper parts of the two suction lifters 16 and 17 are combined to form a common component. This component is designed as a plug-on cap 32. From Fig. 1 of the drawing

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it is evident that the two inlet openings 18 and 28 of the two suction lifters 16 and 17 are arranged at different distances from the bottom 25 of the chamber 24 of the filter carrier 11. The two upper reaches 20 and 26 are also arranged at different distances from this bottom.

From Fig. 1 and 2 of the drawing it can also be clearly seen that the bores 3o and 31 of the two nozzles of the suction lifters 16 and 17 are very differently dimensioned, such that the bore 3o of the main outlet 16 is significantly larger than the bore 31 of the other suction lifter 17. This has the consequence that significantly more filtrate flows out through the bore 3o than through the bore 31.

In the selected embodiment according to Fig. 1 and 2 of the drawing, the two nozzles 19 and 27 have a common wall, which is designated 35. This wall 31 separates the two holes 3o and 31 from each other. The common wall 35 only covers an area of the nozzle 27. This means that the face of the wall facing the filter carrier 11 forms a shoulder that can be used as a stop. This shoulder is effective in Fig. 3 of the drawing. It thus serves to move the push-on cap 32 to a limited extent. The push-on cap 32 can thus be moved to the end position shown in Fig. 3, in which an area hits the shoulder of the wall 35 that acts as a stop. In this position, the two overflows 2o and 26 of the two suction lifters 16 and 17 remain free.

The push-on cap 32 can be held on the two connectors by force. This requires a change in the position of the

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Al/f plug cap 32 is possible in such a way that the distance of the suction openings 18 and 28 of the two suction lifters from the floor can be increased or decreased, with one end position being shown in Fig. 3 of the drawing. In this position, the suction openings 18 and 28 of the two suction lifters 16 and 17 are at the smallest distance from the floor 25. In the position shown in Fig. 3, the suction openings 18 and 28 of the two suction lifters 16 and 17 are at the smallest distance from the floor 25 ^{. fi} s!s ⁿ tsn "SiÜSiriSSfüSn Ä'»*£O ⁱ £**r»L· &mdash; cap for the two suction lifters 16 and 17, the mutual distance between the two suction openings 18 and 28 is constant. If you want to vary this mutual distance between the two suction openings, it is necessary to use two upper parts instead of the common plug-on cap. This means that a special upper part must be assigned to both the nozzle 19 and the nozzle 27.

From Fig. 1 of the drawing it can be seen that the extension and thus the two nozzles 19 and 27 of the suction lifters 16 and 17 are arranged outside the longitudinal center line of the filter device. This is not the case in the second embodiment of the invention according to Fig. 4 of the drawing. Here the filter outlet designated 48 is located in the longitudinal center line of the filter carrier, again designated 11.

If no changes have been made to the embodiment of the filter device according to Fig. 4 in relation to that according to Fig. 1, the same reference numerals have been retained.

Fig. 4 of the drawing shows that a recess 37 has now been made in one wall 36 of the filter carrier, the dimensions of which are such that the two suction lifters shown in Fig. 5, now designated 39 and 4o, can be accommodated in it. The suction lifters 39 and 4o are arranged in a basically known manner

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&Igr; designed as approximately U-shaped»? Röhtfköfper developed, whereby

in both cases one leg of this U is held ^shorter than the other. The suction lifter 39 serves as the main outlet.

Its inlet or suction opening is designated 41, which is followed by a continuous bore 46, which then opens into the outlet opening 42. The second suction lifter 40 also has an inlet or suction opening 43, which is followed by a continuous bore 47, which merges into the outlet opening 44. From Fig. 5 of the drawing it is clearly evident that the bore 46 of the suction lifter 39 is significantly larger than the bore 47 of the second suction lifter 40. From the same Fig. 5 it is also evident that the suction or inlet openings 41 and 43 are spaced apart from one another and are therefore arranged at different heights in relation to the base of the filter carrier 11, now designated 45.

When using the filter devices Io as intended for producing aroma extracts from coffee, tea or the like, the filter bag 13 is first inserted into the filter holder 11 - as is generally the case - which in turn takes in the coffee grounds or the like in the desired quantity. After this <?* hot or boiling water is poured into the filter device

10, which comes into contact with the ground coffee or similar. The resulting filtrate passes through the boundary walls of the filter bag 13 and collects, among other things, above the bottom 25 of the chamber 24 of the filter carrier.

11. As soon as the filtrate accumulating there has reached the lower edge of the overflow 2o of the pipe socket 19 of the first suction lifter 17, this suction lifter starts to run.

This means that the filtrate flows in a fine, steady stream through the outlet opening 21 of the nozzle 19 from the filter device Io. This siphon initially serves only as an outlet until the liquid level reaches the lower edge of the overflow 26 of the second siphon

A portion of the filtrate flows through the bore 3o of the nozzle 27 of the second suction lifter and through the outlet opening into the collecting container. Since - as can be seen in Fig. 1 of the drawing - the bore 3o is kept much larger in cross-section than the bore 31 of the other suction lifter 17, the vast majority of the filtrate flows from the filter device 1 through the bore 3o of the pipe nozzle 28 of the suction lifter 5 into the interior or collecting container below the filter device 10. This means that in this operating phase of the filter device both suction lifters are working. If the liquid level falls below the suction opening 28 of the suction lifter 16, the liquid flow stops, with the result that the suction lifter 16 no longer works. However, the other suction lifter 17 still remains in operation. This continues to work until the residual filtrate in the lower part of the filter vessel 1 is transported to the outside via this suction lifter 17. Its arrangement and dimensions ensure a constant outflow of the residual filtrate and thus prevent premature interruption of the filtrate flow. On the other hand, the design of the filter device according to the invention ensures that the time for removing the residual filtrate is significantly shortened compared to the known method.

As already mentioned, the embodiments shown are only exemplary implementations of the invention and are not limited to them. Rather, many other embodiments and applications are possible. In particular, the design and arrangement of the two suction lifters 16 and 17 can be selected differently from the embodiments shown, whereby it should be noted that one suction lifter should serve as the main outlet and therefore have a larger effective cross-sectional area.

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area than the second siphon must have. The effective cross-sectional area of the bore 31 of the nozzle 19 of the siphon 17 is dimensioned such that either only a thin jet or only a drop-by-drop discharge of the liquid occurs from this siphon outlet. However, this selected arrangement ensures a constant outflow of the residual filtrate without having to fear premature break-off and renewed suction of the filtrate stream. Furthermore , the invention can also be used in other filter devices known per se.

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PATENT ATTORNEYS":

Authorized Attorney General's Office

DIPL.-PHYS. BUSE -DiPL-PHYS. MENTZEL · dipl-ing. LUDEWIQ Unttrdörnen 114 · PO Box 200210 ■ 5600 Wuppertal 2 · Telephone (0202) 557022/23/24 · Telex 8591606 wpat · Fax 0202/571501 S600 Wuppertal 2, the Password: Double suction cup Robert Krups Stiftung & Co. kG., Heresbachstr. 29,

565o Solingen 19

~ Filter device for producing aroma extracts

from coffee, tea or similar.

List of reference symbols

Io Filter device 11 Filter vessel 12 Ribs (at 11) 13 Filter bag 14 - Floor 15 - 16 - Main outlet = 1st suction lifter 17 second outlet = 2nd suction lifter 18 Intake opening (of 17) 19 Socks (of 17) 2o - Overflow (of 17) 21 Outlet opening (on 19) 22 - Top (of 17) 24 Chamber (Fig. 1) 25 Floor (of 24) 26 Overflow (of 16) 27 Socks (of 16) 28 - Intake opening (of 16) 29 Outlet opening (of 16) 3o - Bore (of 16) .". .". A }"· .'· .", ." &bull; * * * · tti 114

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31 - Bore (of 17)

32 - Snap-on cap (for 16 and 17)

33 - Boundary wall (of 24)

34 - Extension (of 25)

35 - common wall (of 19 and 27)

36 - Wall (of 12)

37 - Bulge (of 36)

38 - Accommodation room

39 - Main outlet = 1st suction lifter (second version)

40 - second outlet = 2nd suction lifter (second version)

41 - Inlet opening {of 39) - Intake opening

42 - Exhaust port (of 39)

43 - Inlet opening (from 4o) - Intake opening

44 - Outlet opening (from 4o)

45 - Floor

46 - Bore (of 39)

47 - Bore (of 4o)

48 - Filter outlet

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Claims (1)

PATENT ATTORNEYS..·* Professional representatives before the European Patent Office DiPL-PHYS. BUSE -DiPL-PHYS. MENTZEL · dipl-ing. LUDEWIG Unttrdörntn 114 · PO Box 200210 ■ S600 Wuppertal 2 · Telephone (0202) 557022/23/24 · Telex 8591606 wpat · Fax 0202/571501 5600 Wuppertal 2, the Password: Double suction cup Robert Krups Stiftung & Co. kG., Heresbachstr. 29, 565o Solingen 19 Filter device for producing aromatic extracts from coffee, tea or similar. Expectations 1. Filter device for producing aroma extracts from coffee, tea or the like, consisting of a filter vessel, a filter bag that can be placed therein and with several outlets, in which the filter vessel has a first outlet designed as a suction lifter and a second outlet designed as a main outlet, which lies with its inlet opening above the suction lifter and whose effective cross-sectional area is significantly larger than that of the suction lifter, characterized, that the main outlet of the filter device (4o) is also designed as a suction lifter (16 or 39). 2. Filter device according to claim 1, characterized in that the two suction lifters (16 and 17) arranged on the bottom (25) of a chamber (24) of the filter device each consist of a nozzle (27 and 19) with a continuous bore (29 and 30) and an upper part which can be placed on the latter , iIII
4 ««I Hi ■&mdash;*»-■ 3. Filter device according to claim 1 and 2, characterized in that the two suction lifters (16 and 17, respectively) of the filter device (10) have a common upper part, preferably designed as a slip-on cap (32). 4. Filter device according to claims 1 to 3, characterized in that the upper part or the plug-on cap (32) is arranged on the nozzle (27 or 19) in a positionally adjustable manner in order to change the distance of the suction opening (18 or 28) of the suction lifters (16, 17) from the base (25). 5. Filter device according to one or more of the preceding claims, characterized in that the two nozzles (27 and 19) have a common wall (35) in some areas. 6. Filter device according to claim 5, characterized in that the upper end of the common wall (35) of the nozzles (27 or 19) can be used as a stop for the push-on cap (32). 7. Filter device according to one or more of the preceding claims, characterized in that areas of the nozzles (27 or 19) are designed as an extension (34) lying below the bottom (25) of the chamber (24). 8. Filter device according to claim 7, characterized in that the extension (34) is arranged outside the longitudinal center line of the filter device (lo). 9.- Filter device according to claims 1, 2 and 7, characterized in that the connecting pieces (27 and 19) of the suction lifters (16, 17) including their extension (34) are formed directly onto the bottom (25) of the chamber (24). ·· «I · IiIl If K H ti « I · · 4 I III llji ti (<<·< 111 'Il Il »·' &iacgr; LVi » %tit* s* it *« « H &eacgr; tiitt &bull; t *» « t 11 it lö, Filter device according to claim 1, _{characterized} in that that the two suction lifters (39, 4ö) of the filter device, (lö) are arranged in a recess (38) of the wall (36) of the filter carrier (11) (Fig. 4), 11. Filter device according to claim 10, characterized in that that the suction lifters (39, 40) form a one-piece, approximately U-shaped tubular body in a manner known per se, the bores (46, 47) of which have cross-sectional areas of different sizes and the inlet openings (41, 43) of which are arranged at different heights in relation to the base (45) of the filter device (io) (Figs _. 4 and 5). 12. Filter device according to claim 10 and 11, characterized in that the filter outlet (48) is located in the longitudinal center line of the filter carrier (11).