Insulated filter holder for espresso coffee machine

Abstract

A filter holder for a machine for preparing and dispensing espresso coffee is described, said filter holder comprising a handle, a body connected to the handle and configured to accommodate a filter for ground coffee, and a base cup, the base cup being made substantially of any of the following materials: polysulfide, polyether, polyaryletherketone, polyphenylsulfone, and polysulfone, or the base cup being made of glass, ceramic, porcelain, or a combination thereof.

Description

[Technical field]

[0001] The present invention relates generally to the field of espresso coffee machines, and more particularly to a partially insulated filter holder. [Background technology]

[0002] 2. Description of the Related Art Numerous machines are known for preparing beverages, in particular espresso coffee from coffee powder, pods, capsules or the like.

[0003] Typically, in machines for preparing espresso coffee, a high pressure, high temperature water stream is passed through a pack of ground coffee. Some known machines are capable of precisely regulating the pressure and / or temperature of the water passing through the pack of coffee. Some known machines are also capable of modifying the pressure and / or temperature of the water during dispensing.

[0004] Typically, an espresso coffee machine comprises at least one dispensing unit to which a filter holder arm (also simply called "filter holder") is attached.

[0005] A filter holder typically comprises a body and a handle. The body has a generally cylindrical cross section and is open at the top. The filter, a cup-shaped container with many small holes at the bottom, is housed within the filter holder body. A quantity of ground coffee is loaded into the filter and is typically compressed by the barista either manually or using a special device.

[0006] Typically, the bottom of the body of the filter holder is configured to direct the produced coffee towards an outlet spout which creates a stream of espresso coffee and directs it into a coffee cup, the outlet spout may be single or double.

[0007] Patent document 1 describes a filter holder for a coffee machine. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] European Patent Application Publication No. 2087818(A1) Summary of the Invention [Problem to be solved by the invention]

[0009] As is well known, the dispensing of espresso coffee occurs under high temperature and pressure.

[0010] Many manufacturers have researched and implemented measures to reduce heat dispersion during the preparation of espresso coffee so that the coffee is dispensed at the desired temperature.

[0011] Commercial espresso coffee machines require a relatively long time to warm up the machine, and some baristas have the habit of switching the machine on at night or during periods of non-use to avoid this waiting time. In any case, during the day, especially at certain times of the day, the machine usually remains warm as it continues to dispense coffee.

[0012] A problem with home (or limited commercial use, such as that found in small restaurants) espresso coffee machines is the waiting time required to heat up the machine.

[0013] In fact, the waiting time of several minutes can be irritating for users who want to prepare coffee just for themselves or their guests. Some home espresso coffee machines have a waiting time of 5 to 10 minutes.

[0014] The applicant has set himself the objective of reducing the waiting time for an espresso coffee machine.

[0015] The applicant has investigated the final part of the pathway for preparing espresso coffee, particularly downstream of the filter.

[0016] According to the applicant, a not insignificant portion of the heat of the espresso coffee is lost at the bottom of the filter holder body and at the spout. In fact, the filter holder body made of metal material remains cold, i.e. at room temperature. When the coffee leaves the filter hole and comes into contact with the bottom of the filter holder, it cools down considerably. This has a negative effect on the taste of the coffee, especially the first part that flows out and fills the bottom of the coffee cup. [Means for solving the problem]

[0017] According to the applicant, the problem can be solved by providing a filter holder having a metal body with an open bottom and by providing a base cup made of a material that has a lower thermal conductivity than the metal body.

[0018] According to one aspect of the invention, a filter holder for a machine for preparing and dispensing espresso coffee is described, said filter holder comprising a handle, a body connected to the handle and configured to accommodate a filter for ground coffee, and a base cup, the base cup being substantially made of any material such as polysulfide, polyether, polyaryletherketone, polyphenylsulfone, polysulfone, or the base cup being made of glass, ceramic, porcelain, or a combination thereof.

[0019] According to an embodiment, the base cup is made substantially of polyphenylene sulfide (PPS). For example, a material that has been tested and found to be suitable is Ryton® R-4-244 NA (or other materials in the same series), a high modulus polyphenylene sulfide (PPS) from Solvay.

[0020] According to an embodiment, the base cup is made substantially of polyetheretherketone (PEEK).

[0021] According to an embodiment, the base cup is substantially made of polyphenylsulfone (PPSU), for example a material that has been tested and deemed suitable is Radel® 5100 (or other materials of the same series) from Solvay, a material that has optimal mechanical and thermal properties and is also food grade certified.

[0022] According to an embodiment, the base cup is a separate and / or separable part from the main body, and the filter holder has a rated current of 150 Wm -1 K -1 The thermal conductivity of the thermal insulating material is substantially less than 100 .mu.m.

[0023] For example, the metallic material is steel, preferably chrome-plated steel, or brass, preferably chrome-plated brass.

[0024] The body of the filter holder according to the invention is not made of aluminum or its alloys. In fact, aluminum has too high a thermal conductivity (200 Wm -1 K -1 ), and therefore transfers high thermal energy to the base cup when used in preparing espresso coffee.

[0025] For the purposes of this specification and the claims that follow, the phrase "substantially made of ... [material]" in reference to a part such as a body or base cup indicates that said part is primarily made of a particular material. Thus, for example, if a filter holder body is made of steel with a chrome-plated surface, it falls within the definition of "filter holder body made substantially of steel." Thus, the application of a surface layer does not affect the overall composition of the components.

[0026] According to an embodiment, the material of the base cup is a material that meets food safety requirements (e.g., NSF food contact certification). Preferably, the material has good thermal stability and good mechanical impact resistance.

[0027] According to an embodiment, the base cup is at least partially transparent.

[0028] According to an embodiment, the base cup comprises a substantially smooth inner surface.

[0029] According to an embodiment, the base cup comprises an inner surface having indentations and / or reliefs.

[0030] According to an embodiment, the body comprises a flat support member which supports the filter holder and facilitates pressing the ground coffee into the filter.

[0031] According to an embodiment, the support member comprises teeth which project radially outwardly of the body, preferably in a direction substantially opposite the handle, and which are integrally formed with the body.

[0032] According to an embodiment, the body comprises a first front flange having a first internal groove, a second rear flange having a second internal groove, and two opposing open recesses between the first front flange and the second rear flange.

[0033] According to an embodiment, the first internal groove and the second internal groove open into an open recess, and the base cup comprises a first anterior tooth configured to engage with the first internal groove and a second posterior tooth configured to engage with the second internal groove to couple the base cup to the body.

[0034] According to an embodiment, the filter holder further comprises a retaining member, preferably a ball retainer, to provide additional retention between the base cup and the body.

[0035] According to an embodiment, the filter holder further comprises a protruding lug configured to engage a free edge of the second rear flange.

[0036] According to an embodiment, the filter holder further comprises oppositely disposed whiskers configured to determine a correct angular abutment position of the base cup on the body of the filter holder.

[0037] According to an embodiment, the material of the base cup is a material that is resistant to contact with a liquid substance having a temperature of at least 100°C.

[0038] In the following a detailed description of the invention is given, purely by way of non-limiting example, with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0039] [Figure 1] FIG. 1 is an axonometric view of an example of an espresso coffee machine in which the filter holder according to the invention can be used; [Diagram 2] 1A-1C show bottomless filter holders according to one embodiment of the present invention. [Figure 2A] 1A-1C show bottomless filter holders according to one embodiment of the present invention. [Diagram 3] 1A-1C show bottomless filter holders according to one embodiment of the present invention. [Figure 4] FIG. 2 shows a base cup of a filter holder according to one embodiment of the present invention. [Diagram 5] FIG. 2 shows a base cup of a filter holder according to one embodiment of the present invention. [Figure 6] FIG. 2 shows a base cup of a filter holder according to one embodiment of the present invention. [Figure 7] FIG. 1 illustrates a filter holder with an insulating base cup according to one embodiment of the present invention. [Figure 7A] FIG. 1 illustrates a filter holder with an insulating base cup according to one embodiment of the present invention. [Figure 8] FIG. 1 illustrates a filter holder with an insulating base cup according to one embodiment of the present invention. [Figure 9A] 11A-11C are various axonometric views of a filter holder body according to a second embodiment of the present invention. [Figure 9B] 11A-11C are various axonometric views of a filter holder body according to a second embodiment of the present invention. [Figure 9C] 11A-11C are various axonometric views of a filter holder body according to a second embodiment of the present invention. [Figure 10A] 10 is axonometric views of two base cups configured to mate together with the filter holder body of FIG. 9. FIG. [Figure 10B] 10 is axonometric views of two base cups configured to mate together with the filter holder body of FIG. 9. FIG. [Figure 11] FIG. 11 shows the body and base cup according to FIGS. 9 and 10 in a separated state, i.e. before engagement. [Figure 12] FIG. 2 is a view of the body and base cup during the first stage of bonding the body and base cup. [Figure 13] Two axonometric views of the filter holder body and base cup joined in final position from two different angles. [Figure 14] Two axonometric views of the filter holder body and base cup joined in final position from two different angles. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] Figure 1 shows, by way of example only, an espresso coffee machine, generally designated by the reference numeral 10. The machine 10 comprises a substantially closed machine body 11 within which the main components of the machine (some of which are described below) are housed. The top of the machine 10 is preferably provided with a surface 12 for placing a coffee cup on it. An electrical resistance (not shown) or other heating system may be provided for heating the cup on the surface 12.

[0041] The machine 10 comprises a dispensing unit 13 for dispensing espresso coffee. Below the dispensing unit 13 a drip tray 14 is preferably arranged, which is preferably partially closed at its top by a grill 15. Typically, a coffee cup is placed on the grill 15 during the dispensing of espresso coffee.

[0042] A filter holder, which receives and supports a filter for a pack of coffee powder, is removably engageable with the dispensing unit 13 .

[0043] The machine 10 may include one or more displays and / or push buttons and / or knobs 16, for example, for turning the machine on / off and / or starting / stopping a dispensing operation.

[0044] The machine 10 shown in Figure 1 also comprises a lever 17 for starting / stopping the dispensing of espresso coffee and / or varying the dispensing pressure during the dispensing of espresso coffee.

[0045] FIG. 2 shows a bottomless filter holder 20 to which a base cup 30 according to the present invention can be attached.

[0046] Preferably, the filter holder 20 comprises a handle 21 and a substantially cylindrical body 22 configured to hold a filter 23 filled with coffee grounds.

[0047] Preferably, filter 23 is cup-shaped, open at the top and closed at the bottom, with a plurality of fine holes in the bottom.

[0048] Preferably, a filter retaining clip is provided to hold the filter 23 in place. The filter retaining clip may be received within a groove in the inner wall of the body 22 of the filter holder 20.

[0049] Preferably, the outer surface of the body 22 has two diametrically opposed fins 25 protruding therefrom, which are configured to engage the filter holder 20 with the distribution unit 13. The engagement between the filter holder and the distribution unit can also be achieved by a rotational movement, a translational movement, or a combination of a rotational and a translational movement.

[0050] According to an embodiment of the invention, a support member 26 is provided to facilitate support of the filter holder 20 when the user has to force the ground coffee into the filter 23. As is well known, in practice the ground coffee is usually loaded into the filter and then manually forced in, for example by a tamper.

[0051] 2, 2A, and 3, the support members 26 may be in the form of tines 26 that project radially from the filter holder body. The tines 26 may project radially outward from a point on the filter holder 20 substantially opposite the handle 21. The tines allow a person needing to perform the pushing operation to place the filter holder 20 on the edge of a counter or work surface while supporting the filter holder with one hand and pushing the ground coffee into the filter with the other.

[0052] Figures 4, 5 and 6 show the base cup 30 of the filter holder according to the invention. The base cup 30 is a separate part from the filter holder body and can be easily and quickly attached and removed. One of the advantages is the fact that the base cup 30 is separate from the filter holder body 22 and that the base cup 30 can be more thoroughly cleaned manually or mechanically (e.g. in a dishwasher).

[0053] Typically, the filter holder base cup 30 may be circular in plan view. Preferably, the filter holder base cup 30 has an outwardly projecting upper lip 31 to provide a support surface.

[0054] Preferably, the base cup 30 of the filter holder has a substantially frusto-conical shape to direct the coffee towards a single outlet opening or towards a double outlet opening as shown in Figures 4, 5 and 6. The double outlet opening is usually designed to distribute the coffee into two different coffee cups.

[0055] The applicant believes that thermoplastic materials such as PBT are too sensitive to hydrolysis, i.e. to contact with hot water, particularly at temperatures above 60° C. Thus, PBT is unsuitable for contact with espresso coffee, which is dispensed at temperatures above 80° C. Typically, espresso coffee can reach temperatures of 90° C. or higher.

[0056] The applicant has considered the use of various materials for the manufacture of the base cup, in particular the applicant has tested several materials selected from polysulfides, polyethers, polyaryletherketones, polyphenylsulfones, polysulfones, etc., or glass, ceramic, porcelain, or combinations thereof.

[0057] According to an embodiment, the base cup is made substantially of polyphenylene sulfide (PPS). For example, a material that has been tested and found to be suitable is Ryton® R-4-244 NA from Solvay, which is a high modulus polyphenylene sulfide (PPS).

[0058] According to an embodiment, the base cup is made substantially of polyetheretherketone (PEEK).

[0059] According to an embodiment, the base cup is substantially made of polyphenylsulfone (PPSU), for example a material that has been tested and found to be suitable is Radel® 5100 from Solvay, a material with optimal mechanical and thermal properties, and also food grade certified.

[0060] This material is polyphenylsulfone (PPSF or PPSU), a polymer made of aromatic rings linked by sulfonyl groups (SO2).

[0061] PBT, on the other hand, is a polyester, i.e., it contains ester repeat units (-COOR).

[0062] PPSU is amorphous, while PBT is semi-crystalline.

[0063] The filter holder base cup 30 is in any case made of a material having a lower thermal conductivity than that of the filter holder body (usually made of a metal such as steel or brass). Advantageously, the filter holder base cup may be made by stamping. Alternatively, the filter holder base cup may be made of ceramic, porcelain, glass or a combination thereof.

[0064] In this specification and claims, thermal conductivity is expressed in the International System of Units. In particular, thermal conductivity is expressed in Wm -1 K -1 It is measured in (watts per meter Kelvin), where watts are the unit of measurement for power, meters are the unit of measurement for length, and Kelvin is the unit of measurement for temperature.

[0065] According to an embodiment, the thermal conductivity of the material of the base cup is between 0.1 and 0.5 According to an embodiment, the thermal conductivity of said material is less than 0.4.

[0066] However, if the base cup is made of ceramic, porcelain, or glass (or a combination thereof), the thermal conductivity may be greater than the aforementioned values, for example between 1 and 1.70, and in any case less than 5, preferably less than 2.

[0067] Preferably, the thickness of the base cup may be between 0.5mm and 3mm, for example 1mm or 2mm.

[0068] According to an embodiment, the base cup 30 is made of an at least partially transparent material, which allows the user to see the coffee flowing out of the micro-holes of the filter. As is known, coffee preferably flows out of the filter uniformly, without following a preferential path. If the material of the bottom of the filter holder is at least partially transparent, the user can see the uniformity of the coffee flowing out of the filter. In case of an uneven flow, the user can take corrective measures, such as carefully cleaning the micro-holes of the filter or replacing the filter. If necessary, technical assistance can be requested by attaching photos and videos to the request.

[0069] The inner surface of the base cup may be substantially smooth so that the espresso coffee flows freely towards the single or double opening. Alternatively, the inner surface of the base cup may be provided with a surface relief so as to form a passage, e.g. a groove. According to an embodiment, the surface relief is configured to form a vortex and / or a winding passage, said vortex or winding passage having the effect of mixing or dividing the flow evenly in the case of two outlets.

[0070] 7, 7A and 8 are similar to FIGS. 2, 2A and 3 and show an insulating base cup 30 attached to the body 22 of the filter holder 20. FIG.

[0071] At this point, the advantages of the present invention are clear: Firstly, it allows to significantly reduce the time required for the heating step.

[0072] The filter holder with an insulated base cup reduces the amount of metal present in the filter holder by two-thirds, while the contact area between the distribution unit and the filter remains metallic, taking advantage of its high thermal conductivity, allowing the filter to be heated rapidly.

[0073] The base cup 30 replaces the standard filter holder and spout portions, which are traditionally made of metal, and because the base cup is made of a material with low thermal conductivity, it does not draw heat from the dispensed water, and therefore there is no need to wait for the entire filter holder to heat up as with known filter holders.

[0074] Therefore, the heating time of the system corresponds to heating of the filter only, and took about 2 minutes in laboratory tests.

[0075] Second, the present invention is able to maintain the temperature during the dispensing of the espresso coffee.

[0076] In fact, the insulated base cup tends to dissipate less heat than known filter holders, so the entire system does not affect the beverage dispense temperature set by the user for a particular formula, which allows for improved reproducibility of the beverage's organoleptic properties.

[0077] Thirdly, the invention allows for a better cleaning of the filter holder, especially its bottom part. In fact, the insulating base cup can be removed without the use of tools. It is also possible to place the removable base cup in the dishwasher for thorough cleaning.

[0078] Fourth, if the base cup 30 of the filter holder is made at least partially of a transparent material, the flow of coffee through the filter can be monitored to identify any problems with dispensing or simply for the enjoyment of watching the coffee flow through the filter.

[0079] Figures 9 to 14 show an embodiment of the filter holder according to the invention, in which the engagement between the filter holder body and the base cup is particularly easy, efficient and durable. Indeed, the applicant has realized that the disassembly and reassembly operations depend on the need for frequent cleaning. Furthermore, the base cup can be easily replaced, so that the double-spout filter holder can be easily converted into a single-spout filter holder.

[0080] As shown in Fig. 9, the body 22 of the filter holder 20 is molded to have a first front flange 27 and a second rear flange 28. Thus, two open recesses facing each other are formed between the two flanges 27 and 28. The first front flange 27 is preferably diametrically opposed to the handle 21. The second rear flange is preferably substantially connected to the protrusion 211 of the handle 21.

[0081] According to an embodiment, the two flanges 27 , 28 follow the substantially cylindrical profile of the body 22 of the filter holder 20 .

[0082] According to an embodiment, the first front flange 27 extends downwards further than the second rear flange 28. The reason for this difference will be explained below. The free edge of the second rear flange 28 is preferably rounded.

[0083] The first front flange 27 includes a first internal groove 271. The first internal groove 271 extends across the entire width of the first front flange 27 and opens into the open recess.

[0084] The second rear flange 28 includes a second internal groove 281. The second internal groove 281 extends across the entire width of the second rear flange 28 and opens into the open recess.

[0085] Preferably, the first internal groove 271 and the second internal groove 281 are disposed in a horizontal plane parallel to the plane of the upper edge of the body 22 .

[0086] According to one embodiment, at least one of the grooves includes a retaining member 282 for holding the base cup 30 in place when the base cup 30 is coupled to the body 22 .

[0087] For example, the retaining member 282 may be a ball retainer that is elastically prestressed (e.g., by a spring). The ball retainer 282 may be located inside, e.g., centrally, the second groove 28. The prestressing mechanism, which typically includes a spring, may be housed within the protrusion 211 of the handle 21.

[0088] The filter holder body also comprises fins 25 configured to engage the filter holder 20 together with a dispensing unit of an espresso coffee machine.

[0089] A base cup 30 configured to engage with the body 22 of the filter holder 20 is shown in Figures 10A and 10B. The base cup 30 is cup-shaped with an open top and a substantially closed bottom. A spout 35 (which may be a single spout or a double spout, as shown in Figure 10 and subsequent figures) protrudes from the bottom.

[0090] The base cup 30 includes a side surface with two protruding teeth, a first anterior tooth 37 and a second posterior tooth 38. The two teeth 37, 38 are substantially diametrically opposed to each other. The first anterior tooth 37 is configured to engage with the first anterior groove 271. The second posterior tooth 38 is configured to engage with the second posterior groove 281.

[0091] The first anterior tooth 37 may include an entrance ramp 371 , a substantially flat portion 372 , and an exit ramp 373 .

[0092] Similarly, the second rear tooth 38 can include an entrance ramp 381, a substantially flat portion 382, ​​and an exit ramp 383. The substantially flat portion 382 is interrupted by a cylindrical seat 384. The cylindrical seat 384 is configured to engage the retaining member 382 (ball retainer).

[0093] According to an embodiment, the base cup 30 may also include a protruding lug 33 that projects radially outwardly from the bottom of the base cup. The lug 33 is preferably located substantially below the second rear tooth.

[0094] According to an embodiment, the exterior surface of the base cup 30 also includes two oppositely disposed protruding whiskers 32. The two oppositely disposed whiskers 32 are configured to determine a correct angular abutment position of the base cup 30 on the body 22 of the filter holder 20, as shown in Figures 13 and 14.

[0095] To couple the base cup 30 to the filter holder body 22, the base cup 30 is inserted vertically into its seat in the filter holder (movement from FIG. 11 to FIG. 12) and then rotated so that the first front teeth 37 engage the first front groove 27 and the second rear teeth 38 engage the second rear groove 28. At the end of the rotation the base cup is in the position shown in FIGS. 13 and 14.

[0096] Advantageously, during rotational movement, the ball of the ball retainer 382 resiliently penetrates into the cylindrical seat 384 of the second tooth 38 to precisely define the relative position of the base cup 30 and the filter holder body 22. Entry and exit ramps facilitate retraction of the ball of the ball retainer into the seat.

[0097] Moreover, during the rotational movement, the lugs 33 engage the lower edge of the second rear flange 28. As mentioned before, the second rear flange 28 does not extend downward as far as the first front flange 27. This in fact defines a unique relative position of the filter holder body and the base cup, preventing these parts from being mounted in different positions. In other words, if one tries to rotate the base cup in the opposite direction relative to the body, this rotation is prevented because the lugs collide with the front flange 27.

[0098] To remove the base cup 30, simply rotate the base cup relative to the filter holder body 22 until the ball of the ball retainer moves out of the cylindrical seat.

[0099] It will be appreciated that the embodiment of Figures 9-14 is particularly advantageous since no positioning uncertainty is introduced by the removal and reassembly operations: the correct installation position can be easily sensed by the person installing and removing the base cup.

[0100] Advantageously, the engagement / disengagement forces required to attach / detach the base cup are very limited, so that essentially anyone can engage / disengage the base cup, which is particularly advantageous when the espresso coffee machine is for home use.

[0101] Advantageously, according to the invention, the engaged base cup is held firmly by the filter holder and essentially becomes an integral part of it, preventing accidental dislodging of the base cup even during the more forceful manipulations which entail slamming the filter holder into a coffee grounds drawer to remove the used coffee puck.

[0102] Advantageously, the base cup has a low thermal conductivity so that it can be removed and reassembled at any time, even when the filter holder is hot.

Claims

1. A filter holder (20) for a machine (10) for preparing and dispensing espresso coffee, comprising: a handle (21); a body (22) connected to the handle (21) and configured to receive a filter (23) for ground coffee; and a base cup (30), wherein the base cup (30) is made substantially of any of the following materials: polysulfide, polyether, polyaryletherketone, polyphenylsulfone, and polysulfone; or the base cup is made of glass, ceramic, porcelain, or a combination thereof.

2. 10. The filter holder (20) of claim 1, wherein the base cup (30) is made substantially of polyphenylene sulfide (PPS).

3. 2. The filter holder (20) of claim 1, wherein the base cup (30) is made substantially of polyetheretherketone (PEEK).

4. 10. The filter holder (20) of claim 1, wherein the base cup (30) is made substantially of polyphenylsulfone (PPSU).

5. The base cup (30) is a separate and / or separable part from the main body (22), and the main body (22) of the filter holder has a power rating of 150 Wm －１ K －１ 2. The filter holder (20) of claim 1, made substantially of a metallic material having a thermal conductivity of less than 1000 .mu.m.

6. 6. A filter holder (20) according to claim 5, wherein said metallic material is steel, preferably chrome-plated steel, or brass, preferably chrome-plated brass.

7. 2. The filter holder (20) of claim 1, wherein the body (22) comprises a flat support member (26) that supports the filter holder and facilitates forcing the ground coffee into the filter.

8. 8. A filter holder (20) as described in claim 7, wherein the support member (26) has teeth that protrude radially outward from the body (22), preferably in a direction substantially opposite the handle (21), and are formed integrally with the body.

9. 2. The filter holder (20) of claim 1, wherein the body (22) comprises a first front flange (27) having a first internal groove (271), a second rear flange (28) having a second internal groove (281), and two opposing open recesses (27, 28) between the first front flange (27) and the second rear flange (28).

10. 10. A filter holder (20) as described in claim 9, wherein the first internal groove (271) and the second internal groove (281) open into the open recess, and the base cup (30) has a first front tooth (37) configured to engage with the first internal groove (271) and a second rear tooth (38) configured to engage with the second internal groove (281) to connect the base cup (30) to the main body (20).

11. 10. The filter holder (20) of claim 1, further comprising a retaining member (282), preferably a ball detent, to provide additional retention between the base cup (30) and the body (20).

12. 10. The filter holder (20) of claim 9, further comprising a protruding lug (33) configured to engage a free edge of the second rear flange (28).

13. 10. The filter holder (20) of claim 9, further comprising oppositely disposed whiskers (32) configured to determine a correct angular abutment position of the base cup (30) on the body (22) of the filter holder (20).

14. 2. The filter holder (20) of claim 1, wherein the material of the base cup (30) is a material that is resistant to contact with a liquid substance having a temperature of at least 100°C.

Images