Filtering device for filtering insoluble material

Abstract

The present invention relates to a filter device (36) for filtering insoluble materials used in beverage preparation, particularly for filtering tea or coffee powder, the filter device comprising: a steel body (12) having a plurality of filter openings (14); at least one plastic component (44) made of injection-molded plastic, the plastic being injection-molded around the steel body (12) in a connecting section (38) of the steel body (12), wherein at least one notch (40) is arranged in the connecting section (38) and the notch is at least partially filled by the plastic component (44), or the steel body (12) forms a protrusion (68) protruding from the steel body (12) in the connecting section (38) and the protrusion is at least partially surrounded by the plastic component (44).

Description

Technical Field

[0001] This invention relates to a filtration device for filtering insoluble materials. Background Technology

[0002] This type of filter is particularly used for preparing coffee and tea. The filter has a tubular steel body with multiple filter openings. A bottom steel body is welded to this steel body; the bottom steel body may also have multiple filter openings, but is usually closed.

[0003] To prepare coffee or tea, coffee grounds or tea leaves are filled into a filter device, which is then installed in the mounting opening of a container, such as a coffee pot, teapot, or filter holder. Boiling water is then poured into the filter device. The boiling water comes into contact with the coffee grounds or tea leaves, extracting / leaching aromatic compounds. After a certain contact time between the water and the coffee grounds or tea leaves, the coffee or tea is ready, and the filter device can be removed from the coffee pot, teapot, or filter holder, allowing the coffee or tea to be poured into a cup.

[0004] One particular application uses a so-called filter press, described for example in WO 2017 / 080885. In this filter press, a filter piston is introduced from above into a steel body section and pressed against a bottom steel body. In this application, the bottom steel body does not have filter openings. The steel body section also typically does not have filter openings adjacent to the bottom steel body. As the filter piston moves toward the bottom steel body, coffee grounds or tea leaves accumulate in the area of ​​the bottom steel body and then cannot or only in a negligible amount of contact with water. Furthermore, the coffee grounds or tea leaves do not enter the coffee pot or teapot. Extraction from the coffee grounds or tea leaves is primarily accomplished by the downward pressure of the filter piston.

[0005] When using a filter piston, the filter is typically left inside the coffee or teapot until it is completely emptied. If you then try to pour coffee or tea from the coffee or teapot into a cup, there is a risk that the filter may fall out of the pot.

[0006] A filter device is known from WO 2007 / 082391 A1, which has radially outwardly pointing ridges on its upper edge. These ridges are formed of a plastic component fixed to an upper steel body, wherein the upper steel body is welded to the steel body portion. Here, the plastic component is designed such that the ridges have a certain degree of elasticity or flexibility. The filter device can be clamped to the mounting opening of a coffee pot or teapot using its upper edge to prevent it from falling out when coffee or tea is poured into a cup. Furthermore, the ridges can deform to varying degrees, so that, especially when the coffee pot or teapot is made of glass, the filter device can adapt to different sizes and tolerances of the mounting opening within certain limits.

[0007] As seen in the above implementation scheme, the filter device according to WO 2007 / 082391 A1 has a total of three steel body parts, thus requiring two welds to connect the three steel body parts to each other. It should be noted that when the steel body parts are manufactured from flat material, welds are also needed to convert the flat material into a cylindrical shape, but these welds are not used to connect the three steel body parts to each other.

[0008] To provide a sufficiently stable connection between the upper steel body and the plastic components, the upper steel body must also be equipped with flanges. As a result, the manufacture of the filter device is relatively complex and therefore expensive. Summary of the Invention

[0009] The objective of this invention is to provide a filtration device for filtering insoluble materials that can be manufactured more simply than filtration devices known in the prior art.

[0010] This objective is achieved using the features described in claim 1. Advantageous embodiments are the subject of the dependent claims.

[0011] Embodiments of the present invention relate to a filtration apparatus for filtering insoluble materials used in beverage preparation, particularly for filtering tea or coffee powder, the filtration apparatus comprising:

[0012] - A steel body with multiple filter openings.

[0013] - At least one plastic component made of injection-moldable plastic, wherein the plastic is injection-molded around the steel body in the connecting section of the steel body, wherein

[0014] ○ At least one notch is arranged in the connecting section, the notch being at least partially filled by a plastic component, or

[0015] ○ A protrusion is formed in the connecting section of the steel body, which is at least partially surrounded by a plastic component.

[0016] In the proposed filter device, a direct connection can be provided between the plastic component and the steel body. Here, the plastic component engages with and at least partially fills the recess, or the plastic component surrounds the protrusion, thereby creating a countersunk portion and form-locking between the plastic component and the steel body. For this purpose, only the steel body needs to be inserted into the injection molding tool accordingly. In the proposed filter device, compared to WO 2007 / 082391 A1, the upper steel body is replaced by a plastic component. Therefore, additional welds are no longer needed to connect the upper steel body to the steel body portion. There is also no need for a flange on the upper steel body. This simplifies manufacturing and is therefore cheaper.

[0017] According to another embodiment, the notch can be designed as a through-hole that completely passes through the steel body. In this embodiment, the notch can be manufactured relatively simply and inexpensively, for example, by stamping. Furthermore, the size of the countersunk portion is maximized. This strengthens the connection between the plastic part and the steel body.

[0018] In the improved implementation,

[0019] - The steel body may have a first side and a second side.

[0020] - The through hole can pass through the steel body from the first side to the second side, and

[0021] - The plastic part can be injection molded around the steel body on the first and second sides and completely fill the through hole.

[0022] In this embodiment, the plastic component abuts against the steel body not only on the first side but also on the second side. Furthermore, the through-hole is completely traversed by the plastic component. This provides a connection between the plastic component and the steel body capable of withstanding exceptionally large loads.

[0023] In the improved implementation,

[0024] - The steel body can have an upper edge and a lower edge.

[0025] - The upper edge can protrude radially outward from the rest of the steel body and surround the filling opening.

[0026] - Connecting sections can be formed from the upper edge, and

[0027] - Plastic parts can be placed at the top edge.

[0028] In this embodiment, the plastic component can be positioned radially outward, making it easily accessible. As mentioned at the beginning, boiling water is poured into the filter device to bring it into contact with coffee powder or tea leaves. Consequently, the filter device heats up. Because the plastic component has lower thermal conductivity compared to the steel body, the risk of burns to users who handle the filter device is reduced.

[0029] According to the improved embodiment, the plastic component includes a first plastic and a second plastic, wherein the first plastic fills the notch or surrounds the protrusion, and the second plastic at least partially surrounds the first plastic. Because two different plastics are used, both are preferably injection-moldable, thus allowing their properties to be optimally utilized for their intended purpose. The first plastic establishes the connection between the plastic component and the steel body, ensuring high shape stability, especially under varying temperatures. The second plastic is the plastic that the user grips. In this regard, the second plastic can be selected based on tactile and visual considerations.

[0030] According to another embodiment, the first plastic has a lower hardness than the second plastic and / or the second plastic has a lower thermal conductivity than the first plastic. As described above, the first plastic forms the connection between the plastic component and the steel body. Using a harder plastic can provide a particularly durable connection between the plastic component and the steel body. In contrast, a softer plastic provides a more comfortable tactile experience for the user. As mentioned at the beginning, the filter is placed on or inside a coffee pot or teapot. A softer plastic can conform to the shape of the coffee pot or teapot in the contact area to some extent, making unintentional slippage at least difficult, thereby improving operational safety.

[0031] Secondly, the low thermal conductivity of plastic ensures that even if boiling water is poured onto the insoluble material, the plastic parts will only heat up in a small area where the user grips the filter. Therefore, the likelihood of burning the user's hands while using the device is significantly reduced.

[0032] For example, if polypropylene (PP) is used as the first plastic and thermoplastic elastomer (TPE) is used as the second plastic, then these conditions are met.

[0033] In another embodiment, the upper edge may have an upper edge width and the lower edge may have a lower edge width, wherein the upper edge width is greater than the lower edge width. In this embodiment, the steel body may approximately have a truncated cone or truncated pyramid shape. Furthermore, it has been proven that the truncated cone or truncated pyramid shape of the steel body avoids or at least slows down the accumulation of water in the filtration device.

[0034] A notable improvement in this embodiment is that the bottom steel body is welded to the lower edge of the steel body portion. To prevent coffee powder or tea leaves from entering the coffee pot or teapot through the lower edge, it is essential to ensure that the steel body portion is sealed in the area of ​​the lower edge. For manufacturing reasons, the steel body portion can be sealed in the lower edge area most easily using the bottom steel body.

[0035] According to another embodiment, the bottom steel body may have a bottom wall and at least one side wall, wherein the bottom wall is provided with multiple filter openings, or the bottom wall surrounds the bottom openings, which are covered by a base plate having multiple filter openings. To optimize the extraction of coffee powder or tea leaves, the residence time of boiling water in the filter should be neither too short nor too long. Furthermore, accumulation or even clogging of the steel body should be prevented. It has been shown that designing multiple filter openings in the bottom wall while omitting filter openings in the side walls can increase the residence time of boiling water in the filter without the risk of water accumulation or clogging of the steel body. A slight increase in residence time results in a stronger or richer flavor in the coffee or tea without making it too bitter. The bottom steel body can be implemented as a single piece or a two-piece unit. The base plate can be designed to be flat, thereby simplifying the manufacture of the filter openings compared to a single-piece design, for example, because the wall thickness of the base plate can be selected independently of the rest of the bottom steel body. In particular, the wall thickness of the base plate can be less than the wall thickness of the rest of the bottom steel body, which simplifies and speeds up the manufacturing of the filter openings.

[0036] In another embodiment, it may be applicable that,

[0037] -The steel body has a first side and a second side.

[0038] - The through hole passes through the steel body from the first side to the second side, and

[0039] - Plastic parts

[0040] ○ The plastic component is injection molded around the steel body on the first side, wherein the plastic component is flush with the second side in the area of ​​the through hole, or

[0041] ○ The plastic part is injection molded around the steel body on the second side, wherein the plastic part is flush with the first side in the area of ​​the through hole;

[0042] or

[0043] - Plastic parts

[0044] ○ The steel body is injection molded around the first side, and the protrusion protrudes from the first side, or

[0045] ○ It is injection molded around the steel body on the second side, and the protrusion protrudes from the second side.

[0046] In this embodiment, the plastic component surrounds the steel body from only one side. Furthermore, the plastic component is flush with the side not surrounded by the plastic component in the area of ​​the through-hole. Therefore, the side not surrounded by the plastic component does not have any recesses or protrusions. This prevents coffee powder or tea leaves from adhering, thus simplifying the cleaning of the filter device.

[0047] According to another embodiment,

[0048] - The steel body can have an upper edge and a lower edge.

[0049] - The upper edge can surround and fill the opening.

[0050] - Connecting sections can be formed from the upper edge, and

[0051] - Plastic parts can be placed at the top edge.

[0052] The plastic parts are positioned at the top edge so that the user can safely grip the filter, even when the filter has been heated with boiling water.

[0053] In an improved embodiment, the filter device may include another plastic component, and the plastic component has at least a receiving section for the other plastic component, which is injection molded around the plastic component.

[0054] By adding another plastic component, the filter device can be given additional functions. For example, this other plastic component can be formed with perforations, allowing the filter device to be suspended on a hook. Thus, the filter device can be stored comfortably, for example, in a kitchen. The plastic component connected to the steel body does not need to be changed. Therefore, different variations of the filter device can be provided in a relatively simple manner.

[0055] In an improved embodiment, the plastic component may have a number of notches arranged on the exterior of the steel body, and another plastic component may have the same number of protrusions arranged adjacent to the notches. The protrusions may be designed to be flexible, allowing the filter to be installed into the mounting opening of the coffee pot or teapot, at which point the protrusions deform. Here, a certain amount of friction is generated between the protrusion and the mounting opening of the coffee pot or teapot, thereby preventing the filter from falling out of the coffee pot or teapot. Furthermore, these protrusions may deform more or less. Therefore, dimensional differences in the mounting opening of the coffee pot or teapot can be eliminated. In particular, when the coffee pot or teapot is made of glass, relatively large tolerance deviations are usually generated in the area of ​​the mounting opening, which can be compensated for using the protrusions. Within certain limits, the filter according to this embodiment can also be used with different coffee pots or teapots.

[0056] In another embodiment, the sealed bottom steel body can be welded to the lower edge of the steel body portion. As already mentioned, when using a bottom steel body, the steel body portion can be sealed particularly easily from the lower edge. Sealing is necessary to prevent coffee powder or tea leaves from entering the coffee pot or teapot.

[0057] A key feature of this improved implementation is that the plastic component is designed as a handle or formed into a handle. Designing the plastic component as a handle facilitates operation of the filter device. Since plastic has lower thermal conductivity than steel, the risk of users burning their hands when gripping the filter device is significantly reduced. Attached Figure Description

[0058] Exemplary embodiments of the present invention will now be explained in detail with reference to the accompanying drawings. Wherein:

[0059] Figure 1A A bottom view of a filtering device according to the prior art is shown.

[0060] Figure 1B It shows along Figure 1A The cutting plane AA defined in the middle is used to cut the surface. Figure 1A The filter device shown,

[0061] Figure 2A A bottom view of the filter device according to the invention, based on the first embodiment, in a first manufacturing state is shown.

[0062] Figure 2B It shows along Figure 2A The cutting plane BB defined in the middle is used to cut the section. Figure 2A The filter device shown,

[0063] Figure 2C A bottom view of the filtration device according to the invention in a second manufacturing state is shown.

[0064] Figure 2D It shows along Figure 2C The cutting plane CC defined in the middle is used to cut the section. Figure 2C The filter device shown,

[0065] Figure 2E It shows in Figure 2D The diagram of region A marked in the middle is both a schematic representation and not enlarged to scale.

[0066] Figure 2F A bottom view of the filter device according to the invention in the third manufacturing state, i.e., the completed manufacturing state, is shown.

[0067] Figure 2G It shows along Figure 2F The cutting plane DD defined in the middle is used to cut the section. Figure 2F The filter device shown,

[0068] Figure 3A A perspective view of a second embodiment of the filtering device according to the invention in a first manufacturing state is shown.

[0069] Figure 3B It shows Figure 3A The filter device shown is a perspective view in the second manufacturing state, i.e., the completed manufacturing state.

[0070] Figure 3C It shows Figure 3B The top view of the filter device shown.

[0071] Figure 3D It shows Figure 3B The filter device shown is along Figure 3C A sectional view cut by the cutting plane EE defined in the diagram.

[0072] Figure 3E It shows in Figure 3D The diagram of region B marked in the middle is both schematic and not enlarged to scale.

[0073] Figure 4A A cross-sectional view of a third embodiment of the filtration device is shown in a state of incomplete manufacturing.

[0074] Figure 4B It shows in Figure 4A A magnified view of region C marked in the image.

[0075] Figure 5A A perspective view of a fourth embodiment of the filtration device according to the invention in a first manufacturing state is shown.

[0076] Figure 5B It shows Figure 5A The filter device shown is a cross-sectional view in its completed manufacturing state.

[0077] Figure 5C It shows in Figure 5B A magnified view of the marked area D.

[0078] Figure 5D It shows in Figure 5B A magnified view of region E marked in the middle.

[0079] Figure 5E It shows Figure 5A An enlarged view of the bottom steel body of the filter device shown.

[0080] Figure 5F It shows that according to Figure 5E A separate top view of the bottom steel plate. Detailed Implementation

[0081] exist Figure 1A and 1B The filter device 10, known from WO 2007 / 082391 A1, is shown in two different views. The filter device 10 has a steel body 12 with a plurality of filter openings 14. For the sake of visibility, Figure 1B Only some of the filter openings 14 are shown. However, in Figure 1A The entire area bounded by the filter opening 14 is provided with another filter opening 14.

[0082] The steel body 12 extends substantially cylindrically and can be formed from a flat plate by bending. Therefore, the filter opening 14 can be manufactured by stamping, etching, or similar methods. Etching is particularly suitable because the steel body has a small wall thickness (<1 mm). The steel body 12 has an upper edge 16 and a lower edge 18. A bottom steel body 20 is welded to the steel body 12 at the lower edge 18. The bottom steel body 20 has a bottom wall 22; however, the bottom wall does not have the filter opening 14. Furthermore, the bottom steel body 20 has a side wall 24, which also lacks the filter opening 14. Using the side wall 24, the bottom steel body 20 extends into the steel body 12, which is welded to the bottom steel body 20 at the side wall 24.

[0083] At the upper edge 16, the upper steel body 26 is welded to the steel body portion 12. The upper steel body 26 forms a filling opening 28 through which coffee powder, tea leaves, and water can be filled into the filter device 10. Furthermore, the upper steel body 26 has a funnel-shaped section 30 and a flange 32, to which a plastic body 33 is fixed. The plastic body 33, except for a plurality of raised portions 34, rests against the upper steel body 12. Therefore, cavities 35 are formed between each raised portion 34 and the plastic body 33, thus giving the plastic body 33 greater elasticity in the areas of the raised portions 34 than in the other areas.

[0084] If the filter device 10 is installed into the mounting opening (not shown) of a coffee pot or teapot, the protrusion 34 deforms, thereby creating friction between the mounting opening and the protrusion 34. Thus, the filter device 10 is clamped by the coffee pot or teapot, preventing it from falling out when coffee or tea is poured into a cup. Furthermore, the protrusion 34 can deform more or less, allowing the filter device 10 to adapt to different sizes of the mounting opening of the coffee pot or teapot within certain limits.

[0085] Figure 2A and 2B A first embodiment of the filter device 361 according to the invention in a first manufacturing state is shown. (As in...) Figure 1A and 1BLike the filter device 361 shown, the filter device 361 according to the present invention also includes a steel body portion 12 having a plurality of filter openings 14. In this case, only some of the filter openings 14 are shown, wherein the entire area of ​​the steel body portion 12 defined by the filter openings 14 is provided with filter openings 14. The steel body portion 12 has a substantially cylindrical shape, having an upper edge 16 with an upper edge width WO and a lower edge 18 with a lower edge width WU, wherein the upper edge width WO is approximately equal to the lower edge width WU. Therefore, the filter device 361 according to the first embodiment is suitable for use in a filter press.

[0086] The bottom steel body 20 is welded to the steel body portion 12 at its lower edge 18. The bottom steel body 20 has a bottom wall 22, which does not have filter openings 14. In addition, the bottom steel body 20 includes a side wall 24, which also does not have filter openings 14. The bottom steel body 20 is welded to the steel body portion 12 via the side wall 24.

[0087] At the upper edge 16, the steel body 12 forms a connecting section 38, in which a total of four notches 40 are arranged. In the illustrated embodiment of the filter device 361, these notches are designed as through holes 42 with quadrilateral cross-sections that completely penetrate the steel body 12.

[0088] exist Figure 2C and 2D middle, Figure 2A and 2B The filter device 361 shown is in a second manufacturing state. At the upper edge 16, a plastic component 44 made of injection-molded plastic, such as polypropylene (PP), is injection-molded around the steel body portion 12 in the connecting section 38. Here, the steel body portion 12 has a first side 46 and a second side 48, wherein, in the illustrated embodiment, the first side 46 is the outer side of the steel body portion 12, and the second side 48 is the inner side of the steel body portion 12. The plastic component 44 is injection-molded around the steel body portion 12 on the first side 46, wherein the plastic component 44 extends into the through hole 42. Here, the plastic component 44 is flush with the second side 48 of the steel body portion 12, as shown in... Figure 2E As shown in the schematic diagram. Figure 2E The figure is not shown on scale and is greatly simplified. Figure 2D The marked area A.

[0089] Furthermore, the plastic component 44 forms a receiving section 50, which in the illustrated embodiment includes a lower radially enlarged portion 52 and an upper radially enlarged portion 54, wherein the upper radially enlarged portion 54 extends further radially outward than the lower radially enlarged portion 52. Additionally, the plastic component 44 is equipped with a total of four notches 56 that completely penetrate the plastic component 44.

[0090] Figure 2F and2G The filter device 361 in its finished state is shown. Another plastic component 58 is injection molded around the plastic component 44, wherein the other plastic component 58 abuts upwards against the lower radial expansion and completely surrounds the upper radial expansion 54. The other plastic component 58 can be made of a thermoplastic elastomer (TPE). For example, the TPE can be selected based on hardness. In this example, the hardness of the TPE can be selected to be between 50 Shore A and 68 Shore A, particularly 54 Shore A. Alternatively, styrene-acrylonitrile (SAN) can be used. In the region of the upper radial expansion 58, the other plastic component 58 forms a support edge 60, by which the filter device 361 can be placed on a coffee pot or teapot.

[0091] In the region where notch 56 is located, another plastic component 58 has a radially outwardly extending protrusion 62. While the other plastic component 58 directly abuts against and thus contacts the plastic component 44 radially outward, this contact is eliminated in the regions of protrusion 62 and notch 56. Therefore, in the region of protrusion 62, the other plastic component 58 has increased elasticity or flexural strength compared to the remaining regions.

[0092] As can be seen from this description, the filter device 361 according to the first embodiment has a bottom steel body 20 and a steel body portion 12, which must be welded together. Therefore, with Figure 1A and 1B Compared to the filter device 10 shown, a steel body is eliminated, and therefore the second weld used to connect the steel body portion 12 to the no longer-existing steel body is also eliminated. The plastic part 44 and the other plastic part 58 can be manufactured using the same injection molding tool without changing the position of the steel body portion 12 in the injection molding tool. Therefore, the manufacturing process of the filter device 361 according to the first embodiment is more efficient than... Figure 1A and 1B The filter device 10 shown is significantly simpler and cheaper to manufacture.

[0093] The filter device 361 can be installed into the mounting opening (not shown) of a coffee pot or teapot, wherein the protrusion 62 is more or less deformed. Therefore, friction is generated between the mounting opening and the protrusion 62, thereby securing the filter device 361 relative to the coffee pot or teapot. This prevents the filter device 361 from falling out of the coffee pot or teapot.

[0094] Figures 3A to 3D A second embodiment of the filtration device 362 according to the present invention is shown. Figure 3A A filter device 362 in a first manufacturing state is shown. As in the first embodiment, the steel body 12 is provided with a plurality of filter openings 14, which filter openings in Figures 3A to 3D Only a portion is shown in the text, and... Figures 3A to 3D The diagram is shown only in principle. The filter opening 14 may have a diameter of approximately 0.2 mm or greater.

[0095] In this case, the upper edge width WO of the upper edge 16 is greater than the lower edge width WU of the lower edge 18. Therefore, in the illustrated embodiment, the steel body portion 12 has a truncated conical structure. At the lower edge 18, the bottom steel body 20 is welded to the steel body portion 12, and the bottom steel body also has a truncated conical shape. The bottom steel body 20 has a bottom wall 22 and side walls 24, wherein, for example from... Figure 3C As can be seen, the bottom wall 22 is provided with a certain number of filter openings 14. However, the side walls 24 of the bottom steel body 20 do not have filter openings 14. The number and diameter of the filter openings 14 determine the residence time of hot water in the filtration device 361. As mentioned above, the filter openings 14 have a diameter of about 0.2 mm, which is relatively small. Compared with larger filter openings 14, this reduces the volumetric flow rate through the steel body 12, thereby increasing the residence time of the hot water. The fact that the side walls 24 of the steel body 12 do not have filter openings 14 also leads to an increased residence time of the hot water. As a result, more aromatic substances can be extracted from coffee powder or tea leaves without clogging of the filter openings 14.

[0096] The upper edge 16 of the steel body 12 is designed in a flange shape and extends radially outward. The upper edge 16 surrounds the filling opening 28, through which coffee powder, tea leaves, and water can be filled into the filter device 362.

[0097] refer to Figure 3A The upper edge 16 forms a connecting section 38, wherein the connecting section 38 has a radially outwardly pointing tongue 64. Two through holes 42 with circular diameters are arranged on the tongue 64.

[0098] exist Figures 3B to 3D The image shows the filter device 362 according to the second embodiment in its second state, i.e., the completed state. It can be seen that the plastic component 44 has been injection molded around the connecting section 38. The plastic component 44 is designed in the form of a handle 66, at which the filter device 362 can be gripped. Figure 3E The figure is shown not to scale and purely in principle. Figure 3D As defined in section B, the steel body 12 has a first side 46 and a second side 48, with a through hole 42 extending from the first side 46 to the second side 48 through the steel body 12. A plastic component 44 is injection molded around the steel body 12 not only on the first side 46 but also on the second side 48, wherein the plastic component 44 completely fills the through hole 42.

[0099] Filter device 363, such as Figure 4A and Figure 4B The third embodiment shown largely corresponds to the filter device 361. Figures 2A to 2G The first embodiment is shown. Therefore, only the main differences will be discussed below. Instead of the notch 40, the steel body 12 is formed with a protrusion 68 that projects radially outward from the rest of the steel body 12. In the third embodiment of the filter device 363, this protrusion is designed as a flange and is located at the upper edge 16 of the steel body 12. Here, the protrusion 68 protrudes from the first side 46 of the steel body 12. The protrusion 68 is surrounded by a plastic component 44, thereby providing a reliable connection between the steel body 12 and the plastic component 44.

[0100] Filter device 364, such as Figures 5A to 5F The fourth embodiment shown largely corresponds to the filter device 362 as follows: Figures 3A to 3E The second embodiment is shown. Therefore, only the main differences will be discussed below. As from... Figure 3A and Figure 5A As obtained from the comparison, the filter device 364 according to the fourth embodiment does not have the plastic component 44 surrounding it as in the second embodiment of the filter device 362 (see...). Figure 3B The protruding tongue 64. In this case, the protrusion 68 is formed by the upper edge 16 and is entirely / completely surrounded by the plastic component 44, as shown from... Figure 5B What I saw.

[0101] Especially from Figure 5C and 5D The resulting plastic component 44 includes a first plastic 70 and a second plastic 72. Here, the first plastic 70 is the plastic that contacts the steel body 12 and surrounds the protrusion 68. The second plastic 72 is applied to the first plastic 70 and, in the fourth embodiment of the filter device 364, does not contact the steel body 12. The user grips the filter device 364, which has the second plastic 72, when using the handle 66.

[0102] The first plastic 70 may be polypropylene (PP) and has a higher hardness than the second plastic 72. The second plastic 72 may have a lower thermal conductivity than the first plastic 70. The second plastic 72 is particularly a thermoplastic elastomer (TPE).

[0103] Figure 5E The bottom steel body 20 of the filter device 363 is shown separately. Compared with the bottom steel body 20 of the filter device 362 according to the second embodiment, the bottom steel body 20 of the filter device 364 according to the fourth embodiment is implemented as a two-piece unit and forms a bottom opening 74, which is normally concealed in the filter device 364. Figure 5FThe base plate 76, shown separately, covers the bottom steel body 20. The base plate 76 has multiple filter openings 14, while the rest of the bottom steel body 20 does not have filter openings 14. For example, the base plate 76 can be fixedly connected to the bottom steel body 20 by weld, or simply placed on the bottom steel body 20. In the latter case, the base plate 76 can be removed from the bottom steel body 20, for example, for cleaning purposes.

[0104] List of reference numerals in the attached diagram:

[0105] 10 Filtration device

[0106] 12 Steel body

[0107] 14 Filter openings

[0108] 16 Top edge

[0109] 18 Lower edge

[0110] 20. Bottom steel body

[0111] 22 bottom wall

[0112] 24 Sidewalls

[0113] 26. Upper steel body

[0114] 28 Filling the opening

[0115] 30 Funnel-shaped sections

[0116] 32 Flange

[0117] 33 Plastic body

[0118] 34. Raised section

[0119] 35 Cavity

[0120] 36 Filtration Device

[0121] Filter devices 361 to 364

[0122] 38 Connecting Section

[0123] 40 notch

[0124] 42 Through Hole

[0125] 44 Plastic parts

[0126] 46 First side

[0127] 48 Second side

[0128] 50 Acceptance Section

[0129] 52 Lower radial enlargement section

[0130] 54. Upper radial enlargement section

[0131] 56 gaps

[0132] 58 Another plastic component

[0133] 60 Supporting Edge

[0134] 62. Protrusion

[0135] 64 tab

[0136] 66 Handle components

[0137] 68. Protrusion

[0138] 70 First Plastics

[0139] 72 Second Plastic

[0140] 74 Bottom opening

[0141] 76 base plate

[0142] WO top edge width

[0143] WU bottom edge width

Claims

1. A filtration device (36) for filtering insoluble materials used in beverage preparation, the filtration device comprising: - A steel body (12) with multiple filter openings (14). - At least one plastic component (44) made of injection-molded plastic, which is injection-molded around the steel body (12) in the connecting section (38) of the steel body (12), wherein, At least one notch (40) is arranged in the connecting section (38), which is at least partially filled by the plastic component (44), or The steel body (12) has a protrusion (68) protruding from the steel body (12) in the connecting section (38), which is at least partially surrounded by the plastic component (44). - The filter device (36) has another plastic component (58), and the plastic component (44) has at least one receiving section for the other plastic component (58).

2. The filtration device (36) according to claim 1, characterized in that, The filter device is used to filter tea leaves or coffee powder.

3. The filtration device (36) according to claim 1 or 2, characterized in that, The notch (40) is designed as a through hole (42) that completely penetrates the steel body (12).

4. The filtration device (36) according to claim 3, characterized in that, The steel body (12) has a first side (46) and a second side (48). The through hole (42) passes through the steel body (12) from the first side (46) to the second side (48). The plastic part (44) is injection molded around the steel body (12) on the first side (46) and the second side (48) and completely fills the through hole (42).

5. The filtration device (36) according to claim 4, characterized in that, The steel body (12) has an upper edge (16) and a lower edge (18). The upper edge (16) protrudes radially outward from the rest of the steel body (12) and surrounds the filling opening (28). The connecting section (38) is formed by the upper edge (16). The plastic component (44) is located at the upper edge (16).

6. The filtration device (36) according to claim 5, characterized in that, The plastic component (44) includes a first plastic (70) and a second plastic (72), wherein the first plastic (70) fills the notch (40) or surrounds the protrusion (68), and the second plastic (72) at least partially surrounds the first plastic (70).

7. The filtration device (36) according to claim 6, characterized in that, The first plastic (70) has a higher hardness than the second plastic (72), and / or The second plastic (72) has a lower thermal conductivity than the first plastic (70).

8. The filtration device (36) according to claim 5, characterized in that, The upper edge (16) has an upper edge width (WO) and the lower edge (18) has a lower edge width (WU), wherein the upper edge width (WO) is greater than the lower edge width (WU).

9. The filtration device (36) according to claim 5, characterized in that, At the lower edge (18), the bottom steel body (20) is welded to the steel body part (12).

10. The filtration device (36) according to claim 9, characterized in that, The bottom steel body (20) has a bottom wall (22) and at least one side wall (24), wherein, - The bottom wall (22) is provided with multiple filter openings (14), or - A bottom wall (22) surrounds a bottom opening (74), which is covered by a bottom plate (76) having multiple filter openings (14).

11. The filtration device (36) according to claim 3, characterized in that, - The steel body (12) has a first side (46) and a second side (48). - A through hole (42) passes through the steel body (12) from the first side (46) to the second side (48). - Plastic parts (44) The first side (46) is injection molded around the steel body (12), wherein the plastic part (44) is flush with the second side (48) in the area of ​​the through hole (42), or The steel body (12) is injection molded on the second side (48), wherein the plastic part (44) is flush with the first side (46) in the area of ​​the through hole (42); or - Plastic parts (44) The steel body (12) is injection molded around the first side (46), and the protrusion (68) protrudes beyond the first side (46), or The steel body (12) is injection molded on the second side (48), and the protrusion (68) protrudes beyond the second side (48).

12. The filtration device (36) according to claim 11, characterized in that, The steel body (12) has an upper edge (16) and a lower edge (18). The upper edge (16) surrounds the filling opening (28). The connecting section (38) is formed by the upper edge (16). The plastic component (44) is located at the upper edge (16).

13. The filtration device (36) according to claim 12, characterized in that, The other plastic component is injection molded around the plastic component (44).

14. The filtration device (36) according to claim 13, characterized in that, The plastic component (44) has a number of notches (56) arranged on the outside of the steel body (12). The other plastic component (58) has the same number of protrusions arranged adjacent to the notch (56).

15. The filtration device (36) according to claim 14, characterized in that, At the lower edge (18), a closed bottom steel body (20) is welded to the steel body part (12).

16. The filtration device (36) according to claim 1 or 2, characterized in that, The plastic part (44) is designed as a handle (66) or forms a handle (66).

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