FILTER INSERT FOR AN INFUSION DEVICE FOR PREPARING A BEVERAGE, IN PARTICULAR COFFEE OR Tea, AND INFUSION DEVICE COMPRISING SUCH A FILTER INSERT

Abstract

The invention relates to a filter insert (28) for an infusion device (10) for preparing a beverage, in particular coffee or tea, in which the filter insert (28) comprises: a wall (30) having a first open end (31) and a second open end (33), said wall enclosing a cavity (32) into which a material for preparing the beverage can be inserted, the wall (30) has a perforated section (34) with a plurality of filter openings (36); and a closure part (44) which is releasably connectable or connected to the wall (30) in the region of the first open end (31) and with which the first open end (31) can be closed. Furthermore, the invention relates to an infusion device (10) having such a filter insert (28).

Description

Technical Field

[0001] The present application relates to a filter insert for an infusion device for preparing a beverage, in particular coffee or tea. Furthermore, the present application relates to an infusion device having such a filter insert. Background Art

[0002] The infusion device for preparing beverages is also called a French filter press or filter press. The infusion device has a container with an opening and a closed bottom, whereby the container generally has a cylindrical or prismatic shape. In order to prepare coffee or tea, the desired amount of insoluble material (such as coffee powder or tea leaves) is poured into the container, and then hot water is poured over the insoluble material. Then, the coffee powder or tea leaves are extracted over a certain period of time. Thereafter, a plunger filter assembly is placed in the container, the plunger filter assembly comprising a piston rod and a filter press attached to the piston rod. Typically, the piston rod is slidably mounted in a cover, which can be assembled over the opening and used to close the container. The filter press has a shape corresponding to the cross-section of the container, so that the filter press is flush with the container laterally. The filter press is pressed toward the bottom by means of the piston rod. As a result, the extracted coffee powder or tea leaves are separated from the coffee or tea and compressed in the region of the closed end. The coffee or tea filtered in this way can now be drunk. After the coffee or tea has been completely consumed, the plunger filter assembly is removed from the container and the compressed coffee powder or tea leaves are removed from the container. Documents showing relevant prior art include DE 34 32 289 C1, WO 02 / 067739 A1, EP 2 798985 A1 and WO 96 / 035360 A1.

[0003] In such infusion devices, when the filter press is pressed down, considerable force acts on the wall of the container, which is in many cases made of glass. In extreme cases, there is a risk that the glass of the container will break, causing the hot water inside to escape and scald the user.

[0004] From WO 92 / 13475, US 2005 / 0199129 or WO 2007 / 082391, infusion devices for tea are known which have a filter insert which can be inserted into a container. A plunger filter assembly can be displaced in the filter insert in order to press the filtered tea leaves towards the bottom of the filter insert.

[0005] However, such filter inserts cannot be optimally cleaned. After brewing and pouring the beverage, the extracted tea leaves are located at the bottom of the filter insert and cannot be easily removed therefrom. The same problem also occurs when such filter inserts are used to prepare coffee, for example. Summary of the invention

[0006] The task of one embodiment of the present invention is to propose a filter insert for an infusion device with which it is possible to provide a remedy for the above-mentioned situation in a simple and inexpensive manner and, in particular, to create a filter insert which can be cleaned in a simple manner.

[0007] Furthermore, one embodiment of the invention is based on the task of creating an infusion device operable with such a filter insert.

[0008] This object is achieved with the features indicated in claims 1 and 7. Advantageous embodiments are subject matter of the dependent claims.

[0009] One embodiment of the invention relates to a filter insert for an infusion device for preparing a beverage, in particular coffee or tea, wherein the filter insert comprises

[0010] a wall having a first open end and a second open end and enclosing a cavity into which material for preparing a beverage can be inserted, the wall having a perforated section with a plurality of filter openings, and

[0011] A closure member which is detachably connectable or connected to the wall in the region of the first open end and with which the first open end can be closed.

[0012] As mentioned at the beginning, when the normally insoluble material has been moved towards the bottom of the container by means of the plunger filter assembly, the insoluble material is located in the region of the first open end of the filter insert. In addition, in the case of preparing the beverage in question without the assistance of the plunger filter assembly, the insoluble material will accumulate over time at the first open end of the filter insert due to the gravity acting thereon. Due to the fact that in the prior art the closure member is fixedly connected to the first end of the filter insert, the cleaning of the filter insert is cumbersome. In contrast, according to the present application, the closure member can be detached from the filter insert, which makes the cleaning process much easier. In particular, before the cleaning process begins, it is possible to remove the insoluble material located in the region of the first open end from the filter insert in a simple manner through the first open end. In this regard, most of the insoluble material can be removed from the filter insert without the need for a cleaning liquid. Due to the improved accessibility to the cavity enclosed by the filter insert, it is prevented that the insoluble material adheres to hard-to-reach places and can only be removed with great difficulty. In this regard, the filter insert according to the proposal not only helps to simplify the cleaning process but also helps to reduce the volume of cleaning liquid required.

[0013] According to a further embodiment, the filter insert can comprise a sealing element with which the closure part can be sealed against the wall. During the infusion process, it is not important whether the wall is sealed relative to the closure part. However, when the beverage has been prepared and the filter insert is removed from the container, the sealing element prevents in particular hot beverage residues from dripping from the filter insert through the first open end closed by the closure part. This makes the disposal of the filter insert safer and more hygienic. In particular, beverage residues are prevented from dripping uncontrollably onto surfaces, which then have to be cleaned at more or less expense.

[0014] According to another embodiment, the wall forms a fastening section and the closing part forms a counter-fastening section formed complementary thereto, which fastening section and counter-fastening section interact with each other such that the closing part is detachably connectable or connectable to the wall.

[0015] The fastening section and the counter-fastening section may form interaction surfaces. When the closure member is fastened to the insert, a friction closure may be formed between the interaction surfaces, by which the closure member is fastened to the wall of the insert. The friction closure is on the one hand sufficiently strong to ensure that the closure member does not become detached from the wall during operation of the filter insert, and on the other hand not too strong to enable the closure member to be comfortably connected and disconnected from the wall of the insert.

[0016] According to another embodiment

[0017] - a first protrusion or a first recess is formed on the fastening section, and

[0018] - a second protrusion or a second recess is formed on the counter-fastening section,

[0019] The first protrusion or the first recess and the second protrusion or the second recess interact with each other such that the closure part is connectable or connectable to the wall in a detachable manner.

[0020] By means of recesses and projections, a latching or snap connection between the closure part and the wall of the insert can be established. Such projections or recesses are easy to produce, reliable in handling the insert and easy to use. It may also be possible to arrange the projections and recesses in an inclined manner so that the closure part can be connected to the wall of the insert and disconnected from said wall in a spiral manner.

[0021] According to another embodiment, the fastening section is formed by a separate middle part fastened to the wall. As mentioned previously, the wall has a perforated section forming a plurality of filter openings for separating insoluble material from the liquid. The wall or at least the perforated section can therefore be made of a thin material similar to a sieve. However, in order to provide a friction closure or a first protrusion or a first recess, a middle part with a greater thickness than the perforated section is used. Therefore, the fastening section has a sufficiently high stability to ensure that the closure member is reliably fastened to the wall, although indirectly.

[0022] In another embodiment, the filter insert may comprise a connecting element which is non-detachably connected to the wall and into which the closure part is detachably insertable or pluggable. As mentioned, the wall of the filter insert has a perforated section with a plurality of filter openings. For this purpose, it is convenient to manufacture the wall from a relatively thin steel sheet. The connecting element may be designed on the one hand in such a way that it can be easily permanently connected to the steel sheet and on the other hand in such a way that the closure part can be easily connected to and disconnected from the connecting element.

[0023] In another embodiment, the sealing element can be arranged to seal the closure part relative to the connecting element. Depending on the embodiment, it is not necessary to seal the closure part against the wall. Due to the already mentioned filter opening, beverage residues can escape from the filter insert via the wall anyway. However, sealing the closure part against the connecting element prevents beverage residues accumulated in the volume enclosed by the closure part and the connecting element from flowing out in an uncontrolled manner and causing the contamination described above.

[0024] In another embodiment, the closure member can be screwed into the connecting element. In this way, it is relatively easy to connect and disconnect the closure member to and from the connecting element. In addition, because the closure member is screwed into the connecting element, the user of the filter insert can apply a sufficiently high force to the sealing element so that the sealing element can provide its sealing action to the desired extent.

[0025] A further embodiment can be characterized by the fact that in the region of the second open end a support flange protruding radially outwards beyond the wall is attached to the wall. The support flange serves to place the filter insert on the container in which the beverage is prepared. In this regard, the position of the filter insert relative to the container can be determined within certain limits during the infusion process. In particular, it is not necessary to hold the filter insert with one hand during the infusion process. This improves the handling of the infusion device and increases operating safety.

[0026] One embodiment of the invention relates to an infusion device for preparing a beverage, in particular coffee or tea, comprising: a container having an opening, and

[0027] - A filter insert according to any of the preceding embodiments, which is insertable into the container through the opening.

[0028] The technical effects and advantages that can be achieved with the proposed infusion device are the same as those discussed for the filter insert of the present invention. In summary, it should be noted that the filter insert can be cleaned thoroughly in a simple manner. Furthermore, the volume required for cleaning the filter insert can be reduced, in particular, because the improved accessibility to the cavity enclosed by the filter insert prevents coffee grounds or tea leaves from adhering to hard-to-reach places.

[0029] In another embodiment, it may be provided that the infusion set comprises a retaining ring, said retaining ring

[0030] - can come into contact with a contact edge surrounding the opening, and

[0031] - Has a holding section on which the filter insert can make contact.

[0032] Using the retaining ring, the filter insert can be positioned relative to the container in such a way that a relative movement of the filter insert relative to the container, in particular when pouring out the finished beverage, can be prevented or at least significantly reduced. Pouring of the beverage is thus made safer. In addition, the retaining ring can be used in the manner of an adapter. This makes it possible to use the same filter insert for containers of different shapes. In this regard, it is not necessary to adapt the filter insert to the different containers. Instead, it is sufficient to provide each of the different containers with a retaining ring, which can generally be manufactured in a simpler and cheaper manner than the filter insert.

[0033] A more advanced embodiment may provide that the retaining ring comprises a sealing portion with which the retaining ring can be sealed relative to the container. The sealing section also positions the retaining ring relative to the container. This prevents an unintentional detachment of the retaining ring from the container. In addition, the beverage is prevented from escaping from the container in an uncontrolled manner during pouring.

[0034] According to a further development, the retaining ring can have at least one through-opening through which the beverage can flow. In particular, the through-opening enables the beverage to be poured out of the container at a well-defined point when the retaining ring is sealed relative to the container by means of the aforementioned sealing section. This contributes to the operational safety of the infusion device, in particular when the beverage is still very hot.

[0035] In another embodiment, provision may be made for the infusion device to include a plunger filter assembly which can be inserted into the filter insert through the second open end and which can slide within the filter insert. With the plunger filter assembly, it is possible to move coffee powder or tea leaves or other insoluble material for preparing the beverage towards the second open end of the filter insert and to separate it from the rest of the beverage. Even if the filter opening has retained the insoluble material in the cavity of the filter insert, it may not always be possible to reliably prevent a certain portion of the insoluble material from leaving the filter insert and thus entering the prepared beverage consumed by the user, depending on the particle size of the insoluble material. Such particles are generally considered by users to be unpleasant. Due to the use of the plunger filter assembly, the proportion of particles leaving the cavity of the filter insert can be significantly reduced, thereby increasing the enjoyment of the prepared beverage.

[0036] An advanced embodiment may provide that the plunger-filter assembly has a piston rod, and that the infusion device comprises a cover, which can be brought into contact on the filter insert or on the retaining section, in which the piston rod is slidably mounted. In this embodiment, the plunger-filter assembly can be operated very easily and conveniently, in particular because the piston rod is guided by the cover and thus performs a fixed movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Exemplary embodiments of the present invention are explained in more detail below with reference to the accompanying drawings.

[0038] Figure 1A A first embodiment of an infusion device according to the invention is shown with the aid of a side view.

[0039] Figure 1B Along the Figure 1A The cross-sectional view of the cross-sectional plane AA defined in FIG. Figure 1A The embodiments shown in

[0040] Figure 1C for Figure 1B An enlarged view of the segment X marked in FIG.

[0041] Figure 2A A second embodiment of an infusion device according to the invention is shown with the aid of a side view.

[0042] Figure 2B By following Figure 2A The cross-sectional view of the cross-sectional plane BB defined in Figure 2A The embodiments shown in

[0043] Figure 2C for Figure 2B An enlarged view of the segment Y marked in FIG.

[0044] Figure 3AWith the help of Figure 1B A sectional view following the view of FIG. 1 shows a third embodiment of an infusion device according to the present invention, and

[0045] Figure 3B for Figure 3A Magnified view of the segment Z marked in . DETAILED DESCRIPTION

[0046] exist Figures 1A to 1C , a first embodiment of an infusion device 101 according to the invention is shown with reference to various figures. The infusion device 101 comprises a container 12, which in the illustrated embodiment is designed as a glass or plastic container of substantially cylindrical shape, having a closed bottom 14 and an opening 16. The container 12 can be inserted into a disposal device 18, which has a receiving structure 20 on which a handle 22 is mounted. In this regard, the disposal device 18 is almost flush with respect to the outside of the container 12 and includes feet 24, so that the infusion device 101 can be safely placed on a base (not shown here).

[0047] The container 12 forms in the region of the opening 16 a pouring section 26 with which a beverage which has been prepared with the infusion device 101 according to the invention can be poured, for example, into a cup, as will be discussed in greater detail below.

[0048] If especially from Figure 1B As can be seen, filter insert 28 is inserted into container 12 through opening 16. Filter insert 28 includes a wall 30 enclosing a cavity 32. Wall 30 also has a generally cylindrical shape and includes a first open end 31 and a second open end 33. Figures 1A to 1C In the embodiment selected in the embodiment, the first open end 31 is located in the bottom region and the second open end 33 is located in the region of the opening 16 of the container 12. The wall 30 comprises at least one perforated section 34, which comprises a plurality of filter openings 36 and can be Figure 1C Seen in.

[0049] In particular, Figure 1C It can be seen that the connecting element 38 is connected to the wall 30 of the filter insert 28 in the region of the first open end 31. In the illustrated embodiment, the connecting element 38 is fastened to the wall 30 of the filter insert 28 by means of a form closure. For this purpose, the projection 40 of the connecting element 38 engages in a mounting hole 42 of the wall 30.

[0050] Furthermore, the filter insert 28 comprises a closure part 44, which in the illustrated embodiment can be screwed into the connecting element 38, whereby the first open end 31 of the filter insert 28 can be closed. The screwing in can be carried out, for example, in the manner of a bayonet lock. In addition, a sealing element 46 is attached to the connecting element 38, for which purpose the connecting element 38 has a correspondingly formed recess 50. The sealing element 46 seals the closure part 44 relative to the connecting element 38. The connecting element 38 has a sealing surface 52, which is complementary to the sealing element 46 in section and against which the sealing element 46 presses when the closure part 44 is screwed in. Due to the resulting deformation, the sealing element 46 seals the closure part 44 against the connecting element 38.

[0051] In the region of the second open end 33, the filter insert 28 is connected to a support flange 54, with which the filter insert 28 can be placed on the container 12 at the opening 16. The support flange 54 is connected to the filter insert 28 by a snap connection, however, other ways of connecting the support flange 54 and the filter insert 28 are conceivable. In the illustrated embodiment, however, the support flange 54 does not rest directly on the container 12, but on a retaining ring 56 introduced into the container 12 through the opening 16. The retaining ring 56 comprises a sealing portion 58 which fixes the retaining ring 56 relative to the container 12, the sealing portion 58 abutting the inner surface of the container 12. In the fully inserted condition, the filter insert 28 is connected to the container 12 with reference to the embodiment according to Figures 1A to 1C , the sealing part 58 is located below the pouring part 26. In addition, the retaining ring 56 contains a plurality of through openings 60, which are arranged in the region of the pouring part 26 in the intended use of the infusion device 101. In order to accommodate the supporting flange 54, the retaining ring 56 has a retaining section 61.

[0052] In addition, the infusion device 101 includes a plunger filter assembly 62, which includes a filter press 64 and a piston rod 66 connected to the filter press. The piston rod 66 is slidably mounted in a cap 68, which can be assembled onto the retaining section 61 of the retaining ring 56 and closes the opening 16 of the container 12. The cap 68 simultaneously fixes the filter insert 28 in the retaining ring 56.

[0053] The procedure for preparing the beverage is as follows: First, a generally insoluble material, such as coffee powder or tea leaves, is placed in the filter insert 28, which is closed at the first open end 31 with the closure member 44, but is open at the second open end 33. Subsequently, if not already done, the retaining ring 56 is inserted into the container 12 and the filter insert 28 is then placed on the retaining ring 56. A liquid, in particular hot water, is now poured into the container 12 and waited until the insoluble material has been extracted to the desired extent. During the extraction process, the cover 68 may have been placed on the retaining ring 56. In doing so, the filter press 64 is positioned in the region of the second open end 33 of the filter insert 28. When the extraction process is to be completed, the piston rod 66 is moved towards the bottom 14 of the container 12, thereby inserting the filter press 64 into the cavity 32 of the filter insert 28, thereby moving the insoluble material towards the region of the first open end 31 of the filter insert 28. Now, the infusion device 101 can be gripped by, for example, the handle 22 and the prepared beverage can be poured, for example, into a cup. When the sealing portion 58 seals the retaining ring 56 from the container 12, the beverage first flows through the through opening 60 and then flows through the pouring portion 26, wherein the insoluble material is retained by the filter insert 28 because the filter openings 36 are sized smaller than most particles of the insoluble material.

[0054] Once the container 12 has been completely emptied or no longer drinks, the filter insert 28 is removed from the container 12. The filter insert 28 can be removed from the container 12 together with the cover 68 and the plunger filter assembly 62 stored therein. However, before removing the filter insert 28 from the container 12, it is also possible to first separate the plunger filter assembly 62 together with the cover 68 from the filter insert. In any case, in order to be able to clean the filter insert 28, it is necessary to separate the plunger filter assembly 62 from the filter insert 28. Once this operation is completed, the insoluble material located in the area of ​​the second open end 33 can be removed from the filter insert 28 (for example, by emptying the filter insert 28) to a trash can. However, doing so will generally fail to successfully remove all insoluble materials. In order to be able to thoroughly clean the filter insert 28, the closure member 44 is separated from the rest of the filter insert 28, so that both the first open end 31 and the second open end 33 are now open. Subsequently, both the filter insert 28 and the closure member 44 can be cleaned, for example, in a dishwasher or by hand. Due to the fact that the closure member 44 is detachably attached to the filter insert 28 , the cavity 32 is easily accessible, in particular in the region of the second open end 33 , so that the insoluble material mainly located there can be easily removed.

[0055] Figure 2A to Figure 2CA second embodiment of an infusion device 102 according to the invention is presented with the aid of various illustrations. The basic structure of the infusion device 102 according to the second embodiment example corresponds to the basic structure of the infusion device 101 according to the first embodiment example to a large extent, which is why only the main differences will be discussed below. In particular, the filter insert 28 has essentially the same structure as in the first embodiment example and can therefore be used in the infusion devices according to the first and second embodiments, with only slight modifications to the second open end 33.

[0056] Although the infusion device 101 according to the first embodiment example is particularly suitable for preparing coffee and the infusion device 102 according to the second embodiment example is particularly suitable for preparing tea, no strict distinction is seen herein. In other words, it is also possible to prepare corresponding other beverages with corresponding embodiments of the infusion device 10. It should be noted that the filter insert 28 can also be used in other applications not shown herein.

[0057] The basic difference is that in the infusion device 102 according to the second embodiment example, the plunger filter assembly 62 is not provided. In this regard, there is no guide for the piston rod 66 of the plunger filter assembly 62 in the cover 68. In addition, the container 12 of the infusion device 102 according to the second embodiment example has a different structure from the container 12 of the infusion device 101 according to the first embodiment example. In the infusion device 102 according to the second embodiment example, the container 12 is not made of glass, but of plastic, wherein the handle 22 is directly integrated into the container 12. Therefore, it is not necessary to use the disposal device 18 described for the first embodiment example of the infusion device 101. The container 12 is configured to be securely placed on a support (not shown).

[0058] As mentioned above, there is no guide for the piston rod 66 of the plunger-filter assembly 62 in the cover 68. Therefore, the retaining ring 56 also has a slightly different structure. Compared with the infusion device 101 according to the first embodiment, the retaining ring 56 of the infusion device 102 according to the second embodiment protrudes a much smaller distance into the container 12. Therefore, the retaining ring 56 also does not have any through openings 60, because the beverage can flow directly into the pouring section 26.

[0059] The sealing portion 58 of the retaining ring 56 includes a plurality of protrusions 70 facing radially outward.

[0060] The infusion device 102 according to the second embodiment example can be used in the same manner as described for the infusion device 101 according to the first embodiment example, except for the actuation of the plunger filter assembly 62. As already indicated, the filter insert 28 can be used for various infusion devices. For this purpose, only a sliding modification of the region of the second open end 33 is required. Thus, a modular approach is achieved, thereby making the corresponding costs low without compromising the versatility of application.

[0061] Figure 3A and Figure 3B A third embodiment of an infusion device 103 according to the invention is shown. Figure 3B for Figure 3A Since the basic construction of the infusion device 103 of the third embodiment is largely similar to the infusion devices 101 , 102 according to the first and second embodiments, only the important differences will be described below.

[0062] The infusion set 103 of the third embodiment is equipped with a fastening section 72 adjacent to the first open end 31. The fastening section 72 is formed by a middle portion 71 having a generally cylindrical shape, the outer diameter of which is slightly smaller than the inner diameter of the remaining wall 30. The middle portion 71 is connected to the wall 30 by a formed closure formed by the middle portion 71 and an annular radially outwardly facing projection 82 of the wall 30. The wall thickness of the middle portion 71 is higher than the wall thickness of the wall 30.

[0063] A plurality of first protrusions 74 are formed on the outer surface of the fastening section 72 of the middle portion 71. The first protrusions 74 are slightly inclined relative to a plane defined by the first open end 31.

[0064] On its inner surface, the closure member 44 forms a counter-fastening section 76 complementary to the fastening section 72. A plurality of second protrusions 78 facing radially inward are formed on the counter-fastening section 76. The second protrusions 78 are also inclined in the same manner as the first protrusions 74.

[0065] To connect the closure member 44 to the wall 30, the closure member 44 is placed coaxially with the wall 30 and then moved toward the first open end 31. The closure member 44 is further moved along the longitudinal axis of the filter insert 28 so that the first protrusion 74 and the second protrusion 78 can interact with each other to form a shaped closure. Due to the inclination of the first protrusion 74 and the second protrusion 78, the closure member 44 can be rotated about the longitudinal axis of the filter insert 28, thereby moving along the longitudinal axis until it abuts against the first open end 31. Thereby, the closure member 44 is fastened to the filter insert 28 similar to a screw.

[0066] To disconnect the closure member 44 from the filter insert 28, the closure member 44 is rotated in the opposite direction until the first protrusion 74 disengages from the second protrusion 78. Thereafter, the closure member 44 may be removed from the filter insert 28 by movement along the longitudinal axis.

[0067] Description of Figure Numbers

[0068] 10 Infusion Set

[0069] 101,102,103 Infusion sets

[0070] 12 Container

[0071] 14 Bottom

[0072] 16 Opening

[0073] 18 Disposal device

[0074] 20 Storage structure

[0075] 22 Handle

[0076] 24 feet

[0077] 26 Dumping Section

[0078] 28 Filter insert

[0079] 30 wall

[0080] 31 First open end

[0081] 32 Cavity

[0082] 33 Second open end

[0083] 34 Sections with holes

[0084] 36 Filter opening

[0085] 38 Connecting elements

[0086] 40 protrusion

[0087] 42 Mounting holes

[0088] 44 Closure parts

[0089] 46 Sealing element

[0090] 50 recess

[0091] 52 Sealing surface

[0092] 54 Support flange

[0093] 56 Retaining ring

[0094] 58 Sealing part

[0095] 60 Through opening

[0096] 61 Keep section

[0097] 62 Plunger filter assembly

[0098] 64 Filter Press

[0099] 66 Piston rod

[0100] 68 Cover

[0101] 70 protrusion

[0102] 71 middle part

[0103] 72 Fastening section

[0104] 74 First protrusion

[0105] 76 Reverse fastening section

[0106] 78 Second protrusion

[0107] 82 Outward facing projection

Claims

1. A filter insert (28) for an infusion device (10) for preparing a beverage, in particular coffee or tea, wherein the filter insert (28) comprises a wall (30) having a first open end (31) and a second open end (33) and enclosing a cavity (32) into which material for preparing the beverage can be inserted, the wall (30) having a perforated section (34) provided with a plurality of filter openings (36), and A closure member (44) which is detachably connectable or connected to the wall (30) in the region of the first open end (31) and with which the first open end (31) can be closed.

2. The filter insert (28) according to claim 1, It is characterized in that The filter insert (28) comprises a sealing element (46) with which the closure part (44) can be sealed relative to the wall (30).

3. The filter insert (28) according to any one of claims 1 or 2, Features - the wall (30) forms a fastening section (72), and the closure element (44) forms a counter-fastening section (76) formed complementary to the fastening section (72), The fastening section (72) and the counter-fastening section (76) interact with one another in such a way that the closure part (44) is connectable or attachable to the wall (30) in a detachable manner.

4. The filter insert (28) according to claim 3, Features - a first protrusion (74) or a first recess is formed on the fastening section (72), and - a second protrusion (78) or a second recess is formed on the counter-fastening section (76), The first protrusion (74) or the first recess and the second protrusion (78) or the second recess interact with each other such that the closure member (44) is detachably connectable or connected to the wall (30).

5. The filter insert (28) according to any one of claims 3 or 4, It is characterized in that The fastening section (72) is formed by a separate middle portion (71) fastened to the wall (30).

6. The filter insert (28) according to any one of claims 1 or 2, It is characterized in that The filter insert (28) comprises a connecting element (38) which is non-detachably connected to the wall (30) and into which the closure part (44) is detachably insertable or pluggable.

7. The filter insert (28) according to claim 6, It is characterized in that The sealing element (46) is arranged to seal the closure part (44) relative to the connecting element (38).

8. The filter insert (28) according to any one of claims 6 or 7, It is characterized in that The closure part (44) can be screwed into the connecting element (38).

9. The filter insert (28) according to any one of the preceding claims, It is characterized in that In the region of the second open end (33), a supporting flange (54) which projects radially outwards beyond the wall (30) is fastened to the wall (30).

10. An infusion device (10) for preparing a beverage, in particular coffee or tea, comprising - a container (12) having an opening (16), and - A filter insert (28) according to any one of the preceding claims, which can be inserted into the container (12) through the opening (16).

11. The infusion device (10) according to claim 10, It is characterized in that The infusion set (10) includes a retaining ring (56) - capable of coming into contact with the container (12) in the region of the opening (16), and - has a holding section (61) on which the filter insert (28) can be contacted.

12. The infusion device (10) according to claim 11, It is characterized in that The retaining ring (56) has a sealing portion (58) with which the retaining ring (56) can be sealed relative to the container (12).

13. The infusion device (10) according to claim 12, It is characterized in that The retaining ring (56) has at least one through-opening (60) through which the beverage can flow.

14. The infusion device (10) according to any one of claims 10 to 13, It is characterized in that The infusion device (10) includes a plunger-filter assembly (62) that is insertable into the filter insert (28) through the second open end (33) and slidable within the filter insert (28).

15. The infusion device (10) according to claim 14, It is characterized in that The plunger filter assembly (62) has a piston rod (66) and the infusion device (10) comprises a cover (68) which is capable of making contact on the filter insert (28) or on the retaining section (61), the piston rod (66) being displaceably mounted in the cover (68).

Images