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(11) | EP 4 085 791 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | APPLICATION UNIT WITH AT LEAST ONE LATCHING DEVICE |
| (57) The invention relates to an application unit (1) with a mass container (2) for storing
mass to be applied, which comprises a cap (3) carrying an applicator (18), by means
of which the mass container (2) can be opened and preferably closed again, with at
least one inner container part (4) and at least one outer container part (5) accommodating
the latter completely or partially, wherein the respective outer container part (5)
is closed at its one end face by a continuous end surface (6) and is open at its opposite
end face, wherein a latching device (8) is provided by means of which the respective
inner container part (4) is latched to the outer container part (5) in a form-fitting
manner, characterized in that the latching device (8) has a latching element carrier (9) which is firmly connected
on the inside to the said continuous end face (6) of the outer container part (5)
by gluing or welding and from which a latching element (10) protrudes into the interior
of the respective outer container part (5).
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[0001] The invention relates to an application unit with a latching device in the manner of the generic concept of claim 1.
TECHNICAL BACKGROUND
[0002] An application unit usually comprises all the parts required for applying a cosmetic or medical mass, hereinafter usually referred to simply as "mass", to a surface to be applied.
[0003] Such an application unit comprises at least one mass container for storing the mass to be applied, an applicator (cosmetic, pharmaceutical or medical applicator) with which the mass is applied, and a cap which is usually fixed to the mass container, often attached or screwed to it. In many cases, the cap also carries the applicator, which is why it is essentially a two-part system consisting of the mass container with the stored mass and the cap with the applicator attached to it.
[0004] To better illustrate the construction and use of an application unit, the application of mascara to eyelashes with a preferred application unit provided for this purpose is briefly described below by way of example.
[0005] Such an application unit is usually purchased complete with mass container, cap, applicator (usually carried by the cap) and the mass, which is stored in the mass container. The application unit is usually in a closed and/or sealed state when purchased.
[0006] For application, the cap with the applicator attached to it is then separated from the mass container. Since the applicator in the state of a closed application unit usually reaches to or almost to the closed bottom of the mass container, the applicator is already wetted when it is pulled out of the mass container for the first time. Often there is also a wiper in the neck of the mass container, which removes excess mass from the applicator in order to achieve an ideal wetting of the applicator.
[0007] The wetted applicator is then guided to the surface to be applied, in this case the eyelashes, and the mass is applied to the eyelashes by means of one or more rotary movements of the applicator.
[0008] If required, the applicator can then be dipped into the mass container again, whereby it is sufficient here to simply place the cap on the mass container and this cap does not have to be fixed to the mass container for each new dipping process. The application process can then start again from the beginning, as often as the user wishes.
[0009] In this case, the mass container is usually a one-piece, round, hollow cylinder closed on one side by a continuous end face (bottom), but it can also have other shapes and, above all, additional decorative elements.
[0011] In general, however, almost all application units present the same problem:
At present, as soon as the mass in the mass container is used up, the entire application unit with all its parts is usually disposed of completely and a new application unit is purchased.
[0012] In the course of an increasingly desired sustainability of the products by the customer and the turning away from the throwaway society, in connection with the price orientation of the customer and his desire for the provision of a flexibly usable total system, this circumstance is however more and more often reason for complaint and generally simply no longer up-to-date.
[0013] To solve this problem, a manual refilling of the mass container by the user has already been considered.
[0014] For example, the raw mass could be provided to the user in a storage container, which the user then refills into the mass container himself. However, this is very inconvenient, additional aids (e.g. funnels) are required, the user's clothing or furnishings can easily become soiled, and there is also the risk that the user will not use original products for the mass to be refilled, which on the one hand reduces sales for the original manufacturer and on the other hand poses the risk of unauthorized counterfeit products.
[0015] Therefore, it has already been considered to exchange the entire mass container when the mass has been used up. However, this too is usually cumbersome and does not really offer a flexible overall system. Especially since the mass container is usually designed in one piece, the user thus has to dispose of the most voluminous part of the application unit and, above all, a theoretically still functional part anyway and purchase it again.
[0016] Since the mass container significantly shapes the appearance of the application unit and is especially decisive for such products from the prestige segment, the mass container is also often a rather costly part, which is why disposal and replacement of the mass container are often not profitable.
THE UNDERLYING TASK
[0017] In view of this, it is the task of the invention to specify means by which simple and sustainable replacement of the mass container is made possible. Ideally, the mass container can be exchanged without any special dexterity, breaking off of longer fingernails or other impairments.
THE SOLUTION ACCORDING TO THE INVENTION
[0019] For this purpose, an application unit with a mass container for storing mass to be applied is proposed. The mass container comprises a cap by means of which it can be opened and preferably closed again. The part of the mass container serving directly as a container for the mass consists of an inner container part and an outer container part wholly or partially accommodating the latter, the outer container part being closed at one end face by a continuous end surface and open at its opposite end face. In many cases, the cap consists in a corresponding manner of an inner container part and an outer container part.
[0020] A latching device is provided by means of which the inner container part is positively latched to the outer container part. In this way, the inner container part, which serves directly as a container for the mass, can be fastened in the outer container part assigned to it. Alternatively or additionally, the inner container part can be fastened in this way in the outer container part assigned to it, which is part of the cap and carries the applicator.
[0021] The application unit is characterized in that the latching device has a latching element carrier which is firmly connected on the inside to the said continuous end face of the respective outer container part by gluing or welding and from which a latching element protrudes into the interior of the respective outer container part.
[0022] The mass container of the application unit is thus designed in several parts and consists at least of an outer container part and an inner container part, which is completely or partially accommodated and thus enclosed by the outer container part. Only the inner container part or parts come into direct contact with the mass to be applied.
[0023] A latching element carrier is firmly fixed (glued or welded) to the inside of the base of the outer container part or the end face of the outer container part, which is closed by a continuous end surface. A latching element protrudes from this latching element carrier into the interior of the outer container part, this latching element typically protruding more than 3 mm or, better, more than 5 mm into the outer container part in the direction of the outer container part longitudinal axis (L). In most cases, it does not protrude more than 15 mm beyond into the interior of the outer container part.
[0024] The inner container part, on the other hand, is designed in such a way that it forms a counter latching element on the outside (more on this later) and can latch positively with the outer container part, and here in particular with the latching element which has been fitted to the outer container part, thus forming a latching device by means of which a latching effect can be produced.
[0025] It should be noted here that a "latching element" is only the generic term for a part of the latching device. A latching element can consist of one or more latching arms, which will be described in more detail later.
[0026] The latching and also the subsequent unlatching and thus the separation of the latching preferably takes place without tools, i.e. it is possible without tools by the user only pulling on the upper part of the inner container part or, conversely, exerting pressure on it. No special skill or force is required for this.
[0027] This allows the inner container part to be easily separated from the outer container part and replaced when the mass in the inner container part is used up. The user can thus easily remove and dispose of the inner container part and purchase a new inner container part, which can just as easily be snapped back into the outer container part.
[0028] In general, this results in a sustainable, flexible overall system which allows simple replacement of just one part (inner container part) of the mass container or the cap. The latching element carrier with its latching element simply remains in the reusable outer container part.
[0029] It should be emphasized once again that, alternatively or additionally, the inner container part can also be latched in this way to the outer container part, which is part of the cap and carries the applicator.
[0030] In this case, the applicator is preferably designed at its distal end in such a way that it forms a counter latching element and represents the inner container part. The cap, on the other hand, represents the outer container part and can be provided (glued or welded) on the inside of its closed end face with a latching element carrier with latching element. In this way, a latching device is also created in the cap according to the same principle, whereby the applicator can be latched to the cap on the inside.
[0031] This means that the applicator can also be easily and permanently replaced as soon as its properties no longer meet the user's requirements.
[0032] This makes the entire system even more flexible to use and more sustainable for the user. The aforementioned advantages and definitions can also be adopted here accordingly.
[0033] As mentioned, the applicator referred to is a cosmetic, pharmaceutical or medical applicator.
[0034] The cosmetic applicator is not specifically limited and can be: a foundation brush, a concealer brush, a kabuki brush, a stippling brush, an angled blush brush, a powder brush, an angled brush, a contour brush, a highlight fan brush, a blending brush, an eyeliner brush, angled eyeliner brush, eyeshadow brush, nail brush, nail polish brush, nail polish brush, bronzer brush, shaving brush, lip brush, mascara brush, all-over eyeshadow brush, eyelash/brow comb/brush, smudger brush, fan brush or blush brush.
[0035] Also, the medical applicator is not specifically limited and may be a brush for oral care, e.g., a toothbrush or interdental brush, or for mucosal or whitening treatment; or for skin care, e.g., prescription drug dermatology skin care, OTC skin care, cosmetic skin care, or cosmeceuticals; or for eye care, e.g., for use inside the eye (e.g. Eye drops and ointments, antibiotics, or antimicrobials); or for external eye application (e.g. infections, sty, eyelash/brow treatments); or for hair or scalp treatments; a nail, nail polish, or nail polish brush; or for ear, nose, foot, rectal, or vaginal care or treatment; or for diagnostic treatments or medical sampling; or for the diagnosis, care, skin, oral, eye, or other health care of animals.
[0036] The cosmetic and/or medicinal compositions in the present invention are also not specifically limited and may include mascara, eye shadow, eyeliner, nail polish, lip gloss and other lip makeup, toothpaste, whitening agents, prescription drugs, over-the-counter drugs, cosmeceuticals, eye drops, eye ointment, antibiotics, antimicrobials, or nail polish.
PREFFERED FURTHER DESIGN OPTIONS
[0037] There are a number of ways in which the invention can be configured to further improve its effectiveness or usefulness.
[0038] It is particularly preferred that the latching device of the application unit has a latching element which protrudes from the said continuous end face of the respective outer container part into the interior of the respective outer container part and, in the latched state, receives at least one counter latching element formed on the outer circumferential surface of the respective inner container part. In this case, the latching element has a free clearance with respect to the inner circumferential surface of the respective outer container part in such a way that the latching element does not come into contact with the inner circumferential surface of the respective outer container part, even in the course of its expansion by the counter latching element, or only without stress.
[0039] In general, this means that the latching element is elastically deformed in order to latch the inner container part to the outer container part, allowing the inner container part to slide into the latching element and become firmly hooked there.
[0040] The assumptions made above also apply here and in the following that the inner container part and outer part and the principle of the latching device can also be implemented in the cap, whereby the applicator (inner container part, counter latching element) is latched to the cap (outer container part) and its latching element carrier with latching element according to the aforementioned principle.
[0041] In addition, it is preferred that the latching element consists of only one or of at least two pairs of latching arms, each pair being formed of two latching arms diametrically opposed with respect to the center of the latching element carrier. Due to the fact that the latching element is not circumferential but consists of individual arms, the latching element can be bent up elastically much better. In addition, an even number of arms provides good guidance or centering of the counter latching element.
[0042] In other applications, it is preferred that the latching element consists of an odd number of latching arms, ideally three latching arms, each of which is offset by 120° from the center on the latching element carrier. Again, the fact that the latching element is not circumferential but consists of individual arms means that the latching element can be bent up elastically much better. The odd number of latching arms also makes the counter latching element easier to mount.
[0043] A further preferred embodiment is that the latching element or its latching arms protrude predominantly in the direction of the outer container part longitudinal axis (L) into the interior of the outer container part. This allows the latching arms to be easily expanded.
[0044] It is also preferred that the latching element or its latching arms form a latching protrusion protruding inwards in the radial direction at their free ends.
[0045] On the one hand, the latching protrusion enables the latching device to be hooked in place as mentioned, and on the other hand it also ensures that the latching arms can be spread out more easily.
[0046] Another preferred embodiment is that the latching element or its latching arms taper towards their free ends as their wall thickness decreases in the radial direction. This also allows easier spreading of the latching arms, although the latching arms nevertheless have the thickest wall thickness at the point subject to the highest load (transition to the latching element carrier).
[0047] In addition, it is preferred that the latching element or its latching arms have an inner circumferential surface in the latched state which forms an inner cone and preferably tends to pull the counter latching element cooperating with it deeper into the latching element or its latching arms. This ensures secure hooking, minimizing the possibility of unintentional disengagement of the latch.
[0048] In addition, it is preferred that the latching element carrier is concave at least on its side facing the inside of its associated end face and convex ideally on its side facing the inside of the container. In this way, an ideal fit can be made with the bottom of the outer container part, which is usually also convex. The latching element carrier thus rests on the base over its entire surface, providing the largest possible gluing or welding area for fastening the latching element carrier in the outer container part.
[0049] It is also preferable for the inner container part to have a shoulder with a diameter reduction on its side facing the end face of the outer container part, which shoulder is overlapped by the latching element or its latching arms in the latched state, generally in such a way that the latching element or its latching arms lie in the free space between the outer circumferential surface of the inner container part and the inner circumferential surface of the outer container part. This provides the opportunity to form a suitable counter latching element.
[0050] Furthermore, it is preferred that said shoulder carries a radially outwardly extending latching protrusion at a distance from the end ring surface facing it.
[0051] On the one hand, the latching protrusion enables the latching device to be hooked in place as mentioned, and on the other hand it also ensures that the latching arms can be spread out more easily.
[0052] In addition, it is preferred that a latching recess is formed between the latching protrusion and the end ring surface, the extension of which in the direction of the longitudinal axis of the inner container is at least 0.5 mm greater than the extension of the latching protrusion of the latching element or the latching arms in the same direction.
[0053] This latching recess thus offers the possibility that the respective latching protrusion of the latching arms can rest there in the latched state. To compensate for manufacturing tolerances and any other inaccuracies, the latching recess is dimensioned as described above so that hooking remains possible at all times.
FIGURE LIST
[0054]
Fig. 1 shows the lower part of an application unit in sectional view with a first variant of a latched latching device.
Fig. 2 shows an isometric view of the latching element carrier (four latching arms) of the latching device from Fig. 1.
Fig. 3 shows the lower part of an application unit in sectional view with the first variant of a latching device from
Fig. 1, with the latching protrusions of the latching arms and the inner container part in direct contact with each other.
Fig. 4 shows a section of the lower part of an application unit in sectional view with the first variant of a latched latching device from Fig. 1 with exemplary dimensions of the latching recess.
Fig. 5 shows an entire application unit, with both the cap and the mass container equipped with a latching device.
PREFERRED EMBODIMENTS
[0055] A first variant of the application unit with latching device can be taken from Fig. 1 to Fig. 4.
[0056] Fig. 1 shows the lower part of an application unit 1 in which the applicator 18 is inserted. This is an applicator for applying mascara with an elongated core and bristles. The applicator 18 is here inserted in the mass container 2. Of the mass container 2, one sees here the inner container part 4, which serves directly as a container for the mass. According to the invention, the inner container part 4 is enclosed by the outer container part 5. The continuous, closed end face 6 of the outer container part 5 is preferably curved inwards. The outer container part 5 and thus also the inner container part 4 are preferably cylindrical in design, since this allows them to be locked in any twisting position.
[0057] On the inside of the outer container part 5, the latching element carrier 9 is glued to the continuous end face 6 of the container - usually over essentially the entire surface. This supports the latching arms 12, which together form the latching element 10. These latching arms preferably protrude predominantly or substantially in the direction of the longitudinal applicator axis of the inner container part 4, which serves directly as a container, into the interior space enclosed by the outer container part 5. At their upper end, the latching arms have a latching protrusion 15.
[0058] The inner container part is retracted at its end serving for fastening, thus reducing its outer diameter or its outer size here. In this way, space is created for accommodating the latching arms 12 which form the latching element 10. In the latched state, the latching arms 12 lie in the intermediate space between the inner circumferential surface of an outer container part 5 and the outer circumferential surface of the associated inner container part 4.
[0059] The inner container part 4 has a circumferential shoulder 13 in the area of its end serving for fastening, whereby an end ring surface 14 facing the front end is formed. The section or pin protruding further in the direction of the longitudinal axis L beyond the end ring surface 14 forms a circumferential latching recess 17 and a likewise circumferential latching protrusion 16. Thus, this lower part of the inner container part 4 is designed as a counter latching element 11, which together with the latching element 10 forms the latching device 8.
[0060] Fig 1. shows the completely latched state of the latching device 8, with the respective latching protrusion 15 of the latching arms 12 resting in the latching recess 17. The inner container part 4 is thus hooked to the outer container part 5, or to the latching element 10, which is firmly connected to the outer container part 5 via the latching element carrier 9.
[0061] The entire latching element carrier 9 with its latching arms 12, which form the latching element 10, can be seen in Fig. 2. In this variant, the latching element consists of four symmetrically distributed latching arms 12.
[0062] Here again, the latching protrusion 15 of the latching arms can be recognized. Since the outer container part has the cross-section of a hollow cylinder, the latching element carrier 9 is adapted to this cross-section or the continuous end face 6 of the outer container part.
[0063] If the inner container part 4 is now to be removed from the latched position or moved from the unlatched position to the latched position, the latching arms 12 bend elastically outward. This is shown in Fig. 3. Here, the function of the latching protrusion 15 of the latching arms 12 and the latching protrusion 16 of the inner container part 4 can be seen well. The respective latching protrusions are in contact with each other here, causing the latching arms 12 to bend up even further. It is easy to see that just enough clearance remains between the inner circumferential surface of an outer container part 5 and the outer circumferential surface of the associated inner container part 4, even with latching arms inserted into this intermediate space, for the latching arms to be able to deflect outwards unhindered. As a result of the shape of the latching protrusions, which has preferably been selected here and which becomes effective in a radially wedging manner when the outer container part is pulled, a quasi-automatic force effect is thus produced on the latching arms 12 as soon as the user exerts pressure or pull on the upper end of the inner container part 4. The latching arms preferably become thinner and thinner in the radial direction the further they protrude from the end face base of the outer container part 5.
[0064] To ensure that a latching effect can be achieved even in the event of manufacturing inaccuracies or necessary manufacturing tolerances, the latching recess 17 must be dimensioned accordingly. In some cases, it makes sense to design or tolerate in such a way that the latching arms do not rest directly against the latching protrusion 16 of the inner container part and therefore do not immediately impede the pulling out of the inner container part 4 from the outer container part 5. This results in a starting distance when pulling the inner container part 4 for the purpose of its replacement, even if it may be short in individual cases. When the inner container part is pulled, this first allows the (naturally greater) static friction to be overcome and the inner container part to be set in motion so that it is now only subject to the lower sliding friction. As a result, the holding effect of the latching protrusion 16, with which the inner container part 4 interacts shortly thereafter, can be overcome more easily, with less use of force. Changing the inner container is thus perceived as more pleasant.
[0065] Fig. 4 shows the dimensions of the latching recess 17 and the end ring surface 14. In this case the latching recess 17 is dimensioned in such a way that the latching arm 12 or respectively its latching protrusion 15 has enough space to rest on the latching recess 17 even if the production tolerances effect the shape and size of the latching arms 12. Therefore, the latching effect is always reached if the dimensions stay in the range of the production tolerances.
[0066] Fig. 5 shows, in addition to the latching device 8 at the lower end already shown in Figs. 1 to 4 and just discussed, the conditions in the area of the cap 3. As can be seen, in this embodiment the cap 3 consists - preferably in a corresponding manner according to the analogous provisions of what has already been said - of an inner container part 4 and an outer container part 5. Here, too, a latching device 8 according to the invention is provided, which mostly corresponds to that already described. As can be seen, on this side the inner container part 4 carries the actual applicator 18 via a stem, which is usually discarded each time it is refilled and replaced by a new applicator.
[0067] When using this principle also in the cap, the latching element carrier 9 is also glued to the inside of the closed end face 6 of the cap. In this case, the same latching element carrier 9 is used as already in the mass container 2. Thus, this latching element carrier 9 also carries four latching arms 12 here, which form the latching element 10. The counter latching element 11 is again formed here by the inner container part 4, which in this case preferably forms the applicator or the upper end of the stem of the applicator. The circumferential latching protrusion 16 of the inner container part 4 can also be seen here, whereby the latching device 8 can produce a suitable latching effect, using just the same principle as it is used in the mass container 2. In contrast to the inner container part of the mass container, the inner container part of the cap does not have a shoulder and therefore not a differentiated latching recess.
[0068] In addition, Fig. 5 also shows the two open end faces 7 of the mass container 2 and the cap 3, which are opposite the respective closed end faces 6 of the mass container 2 and the cap 3.
REFERENCE LIST
[0069]
- 1
- Application unit
- 2
- Mass container
- 3
- Cap
- 4
- Inner container part
- 5
- Outer container part
- 6
- Continuous, closed end face or continuous end surface
- 7
- Open end face
- 8
- Latching device
- 9
- Latching element carrier
- 10
- Latching element
- 11
- Counter latching element
- 12
- Latching arm
- 13
- Shoulder of the inner container part
- 14
- End ring surface
- 15
- Latching protrusion of the latching arms or latching element
- 16
- Latching protrusion of the inner container part
- 17
- Latching recess of the inner container part
- 18
- Applicator
- L
- Longitudinal axis of the outer container part
1. Application unit (1) with a mass container (2) for storing mass to be applied, which
comprises a cap (3) carrying an applicator (18), by means of which the mass container
(2) can be opened and preferably closed again, with at least one inner container part
(4) and at least one outer container part (5) accommodating the latter completely
or partially, wherein the respective outer container part (5) is closed at its one
end face by a continuous end surface (6) and is open at its opposite end face, wherein
a latching device (8) is provided by means of which the respective inner container
part (4) is latched to the outer container part (5) in a form-fitting manner, characterized in that the latching device (8) has a latching element carrier (9) which is firmly connected
on the inside to the said continuous end face (6) of the outer container part (5)
by gluing or welding and from which a latching element (10) protrudes into the interior
of the respective outer container part (5) .
2. Application unit (1) with a mass container (2) for storing mass to be applied, which
comprises a cap (3) carrying an applicator (18), by means of which the mass container
(2) can be opened and preferably closed again, with at least one inner container part
(4) and at least one outer container part (5) accommodating the latter completely
or partially, wherein the respective outer container part (5) is closed at its one
end face by a continuous end surface (6) and is open at its opposite end face, wherein
a latching device (8) is provided by means of which the respective inner container
part (4) is latched to the outer container part (5) in a form-fitting manner, characterized in that the latching device (8) has a latching element (10) which protrudes from the said
continuous end face (6) of the respective outer container part (5) into the interior
of the outer container part (5) and, in the latched state, receives at least one counter
latching element (11) formed on the outer circumferential surface of the respective
inner container part (4), wherein the latching element (10) has a free play relative
to the inner circumferential surface of the respective outer container part (5) in
such a way that the latching element (10) does not come into contact or only comes
into contact stress-free with the inner circumferential surface of the outer container
part (5) even in the course of its expansion by the counter latching element (11)
.
3. Application unit (1) according to one of the preceding claims, characterized in that the latching element (10) consists of only one or of at least two pairs of latching
arms (12), each pair being formed by two diametrically opposite latching arms (12)
with respect to the center of the latching element carrier (9).
4. Application unit (1) according to one of claims 1 or 2, characterized in that the latching element (10) comprises an odd number of latching arms (12), ideally
three latching arms (12), which are ideally arranged on the latching element carrier
(9) offset by 120° from the center in each case.
5. Application unit (1) according to one of the preceding claims, characterized in that the latching element (10) or its latching arms (12) protrude predominantly in the
direction of the outer container part's longitudinal axis (L) into the interior of
the outer container part (5).
6. Application unit (1) according to one of the preceding claims, characterized in that the latching element (10) or its latching arms (12) form a latching protrusion (15)
protruding inwards in the radial direction at their free ends.
7. Application unit (1) according to one of the preceding claims, characterized in that the latching element (10) or its latching arms (12) taper towards their free ends
in that their wall thickness decreases in the radial direction.
8. Application unit (1) according to one of the preceding claims, characterized in that, in the latched state, the latching element (10) or its latching arms (12) have an inner
circumferential surface which forms an inner cone and preferably tends to draw the
counter latching element (12) interacting with it deeper into the latching element
(10) or its latching arms (12).
9. Application unit (1) according to one of the preceding claims, characterized in that the latching element carrier (9) is concave at least on its side facing the inside
of the end face (6) assigned to it and is ideally convex on its side facing the inner
container part (4).
10. Application unit (1) according to one of the preceding claims, characterized in that the inner container part (4) has, on its side facing the end face (6) of the outer
container part (5), a shoulder (13) with a diameter reduction which, in the latched
state, is overlapped by the latching element (10) or its latching arms (12), usually
in such a way that the latching element (10) or its latching arms (12) lie in the
free space between the outer circumferential surface of the inner container part (4)
and the inner circumferential surface of the outer container part (5).
11. Application unit (1) according to the immediately preceding claim, characterized in that said shoulder (13) carries a radially outwardly extending latching protrusion (16)
at a distance from the end ring surface (14) facing it.
12. Application unit (1) according to one of the preceding claims, characterized in that a latching recess (17) is formed between the latching protrusion (16) and the end
ring surface (14), the extension of which in the direction of the longitudinal axis
of the inner container part (4) is at least 0.5 mm greater than the extension of the
latching protrusion (15) of the latching element (10) or the latching arms (12) in
the same direction.