Connector with a housing

Abstract

The invention relates to a housing for a plug-in connection, comprising a lower shell element (100) and an upper shell element (200) that is identical to the lower shell element (100), each shell element (100, 200) containing a retaining element (2), by means of which a plug-in connector (1) can be secured to the housing. Each shell element (100, 200) contains a receptacle (3), in which a cable mount (9) can be received and each shell element (100, 200) has at least one detent element (11, 12, 13, 14) that cooperates with a mating detent element (21, 22, 23, 24) of the other shell element (200, 100). The detent elements (11, 12, 13, 14) and the mating detent elements (21, 22, 23, 24) have a multi-step design and the entire border regions between the shell elements (100, 200) forming the housing, with the exception of openings for the plug-in connector (1) and the cable mount (9), have a multi-step design.

Description

[0001] The invention relates to a plug connection.

[0002] These types of connectors are used to connect and disconnect cables that transmit electrical current and / or, for example, optical radiation. Essential components of such a connector include the connector itself, which has contact pins that can be inserted into a corresponding socket. The connector also has pins for securing the cable elements that carry the electrical current or optical radiation. Furthermore, such a connector includes a cable that is connected to the connector.

[0003] Internal connections are often left uncovered. However, when external connections are involved, it is advisable to enclose the contact point with a suitable housing for several reasons. Firstly, such a housing – especially for electrical connections – protects both users and other cables or devices from coming into contact with potentially dangerous voltages present on the connector cables. Furthermore, such a housing protects the connector from dust and corrosion.

[0004] Furthermore, such a housing also serves to prevent the cables connected to the connector from pulling directly on the contact points. These contact points are generally not designed to withstand tensile stress and can therefore fail. The outgoing cable of a connector is often clamped inside the connector housing using crimps or screw terminals, allowing the forces to be applied in a controlled manner and thus ensuring effective strain relief for the contact points. Even if such strain relief is present on a connector, one should not pull on the cable when disconnecting the connector, but rather grasp the connector housing to release it.

[0005] An important function of the housing, particularly in audio and high-frequency connections, is to shield the signal lines connected via the plug from interference and to ensure that electromagnetic radiation emitted from the signal lines does not affect the environment or other components in the system. Such shielding must distinguish between effects from electric or magnetic fields, effects from electromagnetic waves, and conducted effects. Generally, this is referred to as electromagnetic compatibility, which describes the desired state in which technical devices do not interfere with each other through unwanted electrical or electromagnetic effects.

[0006] In mass production, such connector housings are often simply manufactured by overmolding the contact part with plastic. For assembly intended for later disassembly, there are versions that slide on with a snap-in mechanism or screw together.

[0007] A plug housing that is slid on is known, for example, from DE 10 2012 022 187 A1.

[0008] On the other hand, a plug housing produced by screwing parts together is known from EP 0 981 186 A1.

[0009] All known detachable housings have in common that, in combination with the connector, they involve a large variety of components. This necessitates the production and stockpiling of numerous individual parts, which must be manufactured separately. Therefore, the production of such a connector requires multiple production lines for the manufacture of these diverse components, which appears questionable from both an ecological and economic perspective.

[0010] Furthermore, connectors with housings according to the preamble of claim 1 are known from US 4,108,527 A, US 4,822,286 A and US 2004 / 0102082 A1. However, in the housings shown in these documents, the arrangement of a connector can only be achieved by means of a complex mounting, some of which are also multi-part.

[0011] Furthermore, WO 99 / 62145 A1 shows a housing for plug connectors in which a retaining element is provided for each housing half to secure the connector within the housing. However, the connector must be inserted precisely before the housing is closed by joining the two housing halves, so that the retaining elements then press the connector against a beveled housing wall and thus secure it in the housing. The precise positioning of the retaining elements and the connector before closing the housing proves problematic.

[0012] Based on US 4,108,527 A, the object of the invention is therefore to provide a plug connection with a housing which requires as few different individual components as possible and can be assembled in a simple manner, so that the manufacture of such a housing or a plug connection with such a housing meets the current requirements of a manufacturing process from both an ecological and an economic point of view.

[0013] This problem is solved by a plug connection with all the features of claim 1. Advantageous embodiments of the invention are found in the dependent claims.

[0014] The connector according to the invention, comprising a housing for the connector, has a lower shell element and an upper shell element. The upper and lower shell elements are identical to each other. Furthermore, a retaining element is arranged in each shell element, with which a connector can be attached to a first open end of the housing. At the other open end of the housing, a receptacle is provided in each shell element, in which a cable holder can be received. Each shell element has at least one locking element, which interacts with a corresponding locking element of the other shell element, so that the two shell elements, when locked together, form the housing according to the invention. It is further provided that the locking elements and the corresponding locking elements of the shell elements are multi-stage, i.e., stepped with at least two stages, analogous to stair treads.According to the invention, the entire boundary areas between the shell elements forming the housing – with the exception of the openings for the connector and the cable holder – are also designed in multiple stages, i.e., stepped with at least two steps, analogous to stair treads. Furthermore, it is provided that each shell element has a contact surface against which a contact surface of the connector rests in the installed position. The retaining element has a retaining mechanism that interacts with the connector in such a way that the connector is held securely and permanently in the housing in the installed position. This ensures that, in the installed position, the contact surfaces of the retaining element and the connector come into secure contact with each other and cannot move apart.The retaining mechanism of the retaining element has at least one spring arm on which a locking lug is arranged, wherein the spring arm is designed to engage in a receptacle within a rear wall of the connector, the locking lug engaging behind the rear wall of the connector in the assembly position.

[0015] The invention provides a connector with a housing for the connector, which is characterized in that only two identical shell elements are required for its manufacture. This ensures both ecological and economical production of the connector housing, as it results in a significant reduction in the number of components compared to the prior art. According to the invention, only two identical shell elements are necessary for the housing, which, moreover, automatically lock together by means of the inventive locking and counter-locking elements, thus forming the housing according to the invention. This locking mechanism ensures electromagnetic compatibility, as it provides a corresponding seal for the housing.It is of course necessary to consider that the material from which the identical shell elements are manufactured must possess appropriate shielding properties. However, the selection of such materials is familiar to those skilled in the art. In the assembled state, the open ends of the housing are closed on one side by the corresponding connector and on the other by a cable holder. The cable holder can also be designed as an interchangeable insert, allowing different cable diameters to be used with the housing according to the invention for a plug connection. A connection between the cable and the housing can be achieved at the corresponding cable holder by means of a crimp connector. However, it is also possible to connect a corresponding cable to the housing according to the invention in another way – as is already known from the prior art.The connector is held firmly and securely in the assembled state in the housing according to the invention by means of the retaining elements which are assigned to each shell element.

[0016] This multi-stage design of the locking elements and the entire boundary areas further increases the electromagnetic compatibility of the housing according to the invention, since electromagnetic fields and waves are significantly impeded by the multi-stage structure of the locking and counter-locking elements as well as the entire boundary areas at the point of passage in the locking area of ​​the closed housing. This also results in a corresponding increase in the housing's sealing performance, which further enhances electromagnetic compatibility.

[0017] The embodiment of the invention aims in the same direction, namely to achieve a tightness of the housing that increases electromagnetic compatibility, by providing a recess in the receptacle for the cable holder into which a bead of the cable holder can be received. This ensures that no electromagnetic radiation can escape from or enter the housing directly in the area of ​​the cable holder.

[0018] According to another advantageous aspect of the invention, the retaining element arranged in the respective shell element is designed as a separate component that can be inserted into the respective shell element. Although this may seem counterproductive with regard to the invention's concept of using as few different components as possible, it offers the significant advantage that considerably simpler tools can be used to manufacture the shell elements and the retaining elements that can be inserted therein. In particular, this makes it possible to produce both the shell elements and the retaining elements using injection molding and to demold them easily from the tools. While a single-piece design of the respective shell element with the retaining element means that only one component is required to realize the housing according to the invention, this approach offers a significant advantage.However, the tooling required to manufacture such a one-piece shell element with a retaining element is significantly more complex. While using two separate components for the retaining element and the shell element increases the number of different parts by 100 percent, from one to two, the advantage of being able to use much simpler tools for manufacturing these individual parts outweighs this disadvantage. This simplifies the production of the individual parts, makes them less prone to errors, and thus also addresses ecological and economic considerations.

[0019] Advantageously, at least one positioning element is provided in the shell elements, which interacts with a counter-positioning element of the respective retaining element. This makes it easy to position the retaining element in the respective shell element according to its use in the housing. This avoids or at least significantly minimizes mispositioning and thus any potentially negative impact on the electromagnetic compatibility of the housing according to the invention. Furthermore, this ensures that the retaining element is positioned precisely for the secure holding or fixing of the connector in the housing.

[0020] Furthermore, it has proven advantageous for at least one positioning element of the shell element to be designed as a guide element, which interacts with a counter-guide element of the retaining element. This ensures that when the retaining element is inserted into the respective shell element, it is guided precisely into its target position, where it securely holds the connector in the housing once assembled.

[0021] Furthermore, it can advantageously be provided that locking lugs are arranged on the retaining element which, in the assembly position, engage in receptacles of the shell elements, thus securing the respective retaining element in a captive, but preferably movably, manner within the corresponding shell element. This ensures that the retaining elements of the shell elements are already captive on the shell elements during assembly of the housing. However, the movable, captive arrangement of the retaining elements within the shell elements provides a certain degree of tolerance during assembly of the housing according to the invention, which can contribute to a less error-prone manufacturing and assembly process.

[0022] Further objectives, features and possible applications of the present invention will become apparent from the following description of an exemplary embodiment with reference to the drawings.

[0023] They show: Figure 1: An embodiment of a shell element of a housing of a plug connection according to the invention in a perspective view; Figure 2: A retaining element for a shell element according to the invention. Figure 1 in a perspective view, Figure 3: the holding element according to Figure 2 inserted into the shell element according to Figure 1Figure 4: an embodiment of a connector for a housing of a plug connection according to the invention in a perspective view, Figure 5: a first embodiment of a cable holder for a plug connection according to the invention in a perspective view, Figure 6: a second embodiment of a cable holder for a plug connection according to the invention in a perspective view, Figure 7: a third embodiment of a cable holder for a plug connection according to the invention in a perspective view, Figure 8: the shell element according to the Figure 3 with an additionally inserted connector in a perspective view, Figure 9: the shell element according to the Figure 8 with an additionally attached retaining element for the upper shell element in a perspective view, Figure 10: the shell element according to Figure 9 with additionally inserted cable holder according to Figure 7Figure 11 shows an embodiment of a housing for a connector according to the invention in a perspective view. Figure 12 shows a first cross-section through the housing according to the invention. Figure 11 Figure 13: a second cross-section through the housing according to the Figure 11 Figure 14: a third cross-section through the housing according to the Figure 11 and Figure 15: a fourth cross-section through the housing according to the Figure 11 .

[0024] In the Figure 1 Figure 1 shows a lower shell element 100 of an embodiment of a housing for a connector according to the invention in a perspective view. This embodiment of the housing is a DVI connector housing which has an opening at one end for a DVI connector 1 according to the Figure 4 The housing has an opening at its other end, in which a cable holder 9 is located according to the Figures 5 to 7It can be fixed in place. A fully assembled DVI connector housing according to the invention is the Figure 11 to be taken.

[0025] The shell element 100 is essentially rectangular in its front area, where the DVI connector 1 is inserted, and includes a recess 15 in which the DVI connector 1 can be positioned. Towards its other end, the shell element 100 tapers conically, where it has a receptacle 3 for a cable holder 9. A corresponding cable holder 9 is inserted into this receptacle 3 when the housing is mounted according to the Figure 11 The mounting 3 is captive and immovably fixed. The receptacle 3 has a recess 26 into which, when mounted, a bead 25 of the cable holder 9 engages, effectively preventing direct transmission of electromagnetic radiation into and out of the housing.

[0026] The shell element 100 has locking elements 11 and 12 on one side of its front area, which correspond to corresponding counter-locking elements 21 and 22 on the other side of the front area of ​​the shell element 100. Similarly, the shell element 100 has locking elements 13 and 14 on one side of its rear, tapered area, which correspond to corresponding counter-locking elements 23 and 24 on the other side of the tapered rear area of ​​the shell element 100.

[0027] Shell element 100 is identical to shell element 200, as it is in Figure 11 as shown in the assembled housing. Due to the special identical design of the shell elements 100 and 200, these can now be easily assembled into the housing according to the Figure 11 to be assembled. The locking elements 11 and 12 of the shell element 100 engage in the Figure 11The non-visible counter-locking elements 21 and 22 of the shell element 200 and the locking elements 13 and 14 of the shell element 100 are inserted into corresponding counter-locking elements 23 and 24 of the shell element 200 and vice versa.

[0028] The special stepped design of the locking elements 11, 12, 13 and 14, as well as the counter-locking elements 21, 22, 23 and 24, and a cover 16 on one side in the front area of ​​the shell elements 16, ensures that the boundary areas of the shell elements 100 and 200 do not form a direct passage when assembled and are also stepped. The boundary areas of the shell elements 100 and 200 in the area of ​​the locking elements 11 to 14 and counter-locking elements 21 to 24, as well as the cover 16, are defined in the assembly position of the shell elements 100 and 200 according to Figure 11arranged in such a way that the boundary areas are stepped. This is also clearer in the sectional views described in more detail below. Figures 14 and 15 This effectively prevents the direct transmission of electromagnetic radiation or electromagnetic fields through the housing – both from the inside out and from the outside in.

[0029] Furthermore, the shell element 100 exhibits according to the Figure 1 and thus also the shell element 200 positioning elements 31 to 35, which with counter-positioning elements 41 to 45 of a holding element 2, as it is in Figure 2The positioning elements 31 to 34 of the shell elements 100 and 200 correspond to the positioning elements 31 to 34 of the shell elements 100 and 200. These positioning elements are designed as guide elements or guide rails that engage in corresponding counter-positioning elements 41 to 44 of the retaining element 2, which are designed as guide openings. Furthermore, the shell elements 100 and 200 have receptacles 20 on both sides in their front region, into which corresponding locking lugs 10 arranged on the retaining elements 2 engage. These locking lugs 10 and receptacles 20 serve to ensure that the retaining element 2 can be attached to the shell elements 100 and 200 in a captive yet movably secure manner before their final assembly into the housing according to the invention.

[0030] In the Figure 2In the figure, in which the retaining element 2 is shown in a separate illustration, a retaining mechanism 4 is also clearly visible, with which, after the retaining element 2 has been arranged in the respective shell element 100 or 200, a corresponding connector 1 can be securely held. In this case, the retaining mechanism 4 consists of two spring arms 5, at the free end of which a locking lug 6 connecting the spring arms 5 is arranged.

[0031] Furthermore, the retaining element 2 has a contact surface 40 in which, in the assembly position, a contact surface 50 of the connector 1 comes to rest.

[0032] It should also be mentioned that the positioning element 35 of the shell elements 100 and 200 is designed as a circular elevation in the front area of ​​the shell elements 100 and 200, and corresponds to a corresponding circular opening 45 of the retaining element 2.

[0033] In Figure 3The figure now shows how the retaining element 2 is arranged in the shell element 100. The positioning elements 31 to 35 of the shell element 100 are positioned in the counter-positioning elements 41 to 45 of the retaining element 2. To prevent the retaining element 2 from being lost from the shell element 100 during handling, the locking lug 10 of the retaining element, which is slidably positioned within the receptacle 20 of the shell element 100, holds the retaining element 2 movably but securely to the shell element 100.

[0034] Figure 4Figure 1 shows a DVI connector 1, which can be positioned in the exemplary embodiment of the housing shown here. The connector 1 has a plurality of contacts 60 to which corresponding lines or signal lines of the cable, which are not shown in the figures for the sake of clarity, can be arranged, for example by soldering the corresponding lines to the contacts.

[0035] The connector 1 also has a rear wall 8 with a contact surface 50 which, in the assembled state, rests against the contact surface 40 of the retaining element 2. Furthermore, this rear wall 8 has a recess 7 into which the retaining mechanism 4 of the retaining element 2 can engage. In the assembled state, the locking lug 6, which is arranged on the spring arms 5 of the retaining element 2, engages behind the rear wall 8 of the connector 1 and thus ensures that the contact surfaces 50 and 40 of the connector and the retaining element, respectively, come into secure contact in the assembled position and remain in this position.

[0036] Figure 5Figure 1 shows a solid cable holder 9, which can be inserted into the receptacle 3 of the shell elements 100 and 200. The cable holder 9 has a solid base body 19 with beveled surfaces 17 and 18. The base body 19 ensures that the cable holder 9 is securely held in the receptacle 3 of the shell elements 100 and 200 when the housing is assembled. To further reinforce this secure hold, the beveled surfaces 17 and 18 are provided, which bear against the inside of the shell elements 100 and 200 or the housing on the inside of the tapered end when the base body 19 of the cable holder 9 is inserted into the receptacle 3 of the shell elements 100 and 200. The cable holder 9 also has a cable opening 51 through which a cable with its multiple conductors can be routed.It may be provided that different cable holders with different diameters of the cable opening 51 are provided, so that cables with different diameters can be inserted into the housing.

[0037] In the representations according to the Figures 6 and 7 Two further embodiments of cable holders are shown, which, however, have different cable openings 52 and 53 respectively. This makes it clear that it is possible to use different cables with different cable diameters or geometries in the same housing.

[0038] In Figure 8The figure now shows how the connector 1 is held in the housing in its assembled position. For clarity, the upper formwork element 2 has been omitted from the illustration. It is clearly visible how the contact surfaces 40 of the retaining element 2 and the contact surfaces 50 of the connector 1 come into contact with each other. To prevent the contact surfaces 40 and 50 from separating, the locking lugs 6 of the spring mechanism 4 of the retaining element 2, which are held on the spring arms 5, engage the rear wall 8 of the connector 1.

[0039] To connect connector 1 to the housing, connector 1 is inserted into the front opening of the housing until the locking lug 6 of the retaining element 2 engages in the receptacle 7 on the rear wall 8 of the connector. As connector 1 is inserted into the housing, the locking lug 6 of the retaining element 2 is lifted by the spring-loaded connection of the spring arms 5 until the locking lug 6 has overcome the rear wall 8 of the connector. The spring arms 5 then cause the locking lug 6 to engage behind this rear wall 8 of the connector. In this position, the contact surfaces 40 and 50 of the retaining element and the connector come into contact, thus securely holding the connector in the housing formed by the shell elements 100 and 200.

[0040] In the following Figures 9 to 11The step-by-step assembly of the housing with cable holder 9, connector 1, retaining elements 2, and shell elements 100 and 200 is now shown. It should be noted again that, for the sake of clarity, the cable containing the wires or signal lines has been omitted from the illustration. It is clearly visible in Figure 11 the bead 25 of the cable holder 9, which in the mounted state is received in the recess 26 of the receptacle 3 of the shell element 200.

[0041] In the Figures 12 and 13 Various sections of the housing are now shown to demonstrate once again the tightness of the housing according to the invention with regard to electromagnetic radiation and the secure hold of the connector 1 in the housing.

[0042] Figure 12The figure shows a cross-section in the rear area of ​​the housing through the locking elements 13 and 14 and counter-locking elements 23 and 24 of the shell elements 100 and 200. As can be clearly seen, it is not easy for electromagnetic radiation or electromagnetic fields to penetrate the boundary areas in the connection area of ​​the two shell elements 100 and 200, since these are stepped over their entire longitudinal extent.

[0043] This is further illustrated by the cross-sectional view of the Figure 13 illustrated, which show a section through the locking elements 12 and counter-locking elements 22 of the shell elements 100 and 200.

[0044] Figure 14Figure 1 shows a longitudinal section through the housing according to the invention. The retaining elements 2, held in the shell elements 100 and 200, with their retaining mechanism 4, consisting of the spring arms 5 and the locking lug 6, are clearly visible. Furthermore, the clearance 15 within the housing for the connector 1 and the contact surface 40 of the retaining element 2 are also clearly visible in this illustration.

[0045] Figure 15 The figure now shows the housing after the connector 1 has been inserted into the recess 15 until the contact surface 50 on the rear wall 8 of the connector comes to rest against the contact surface 40 of the retaining element 2. It is clearly visible how the locking lug 6 of the retaining mechanism 4 of the retaining element 2 engages behind the rear wall 8 of the connector 1, thus ensuring the secure retention of the connector 1 in the housing.

[0046] The assembly process for producing the plug connection with the housing according to the invention can be described as follows: First of all, the cable holder 9 is pushed over the cable containing the lines or signal lines.

[0047] The individual wires or signal wires of the cable are then connected to the contacts 60 of connector 1.

[0048] The housing halves 100 and 200, which form the actual housing, are then placed onto the cable holder 9 with the retaining elements 2 already arranged therein, such that the cable holder is securely held in the housing. The locking elements 11 to 14, in conjunction with the counter-locking elements 21 to 24, close the two housing halves 100 and 200 to form the housing according to the invention. The connector is then inserted into the housing until the locking lugs 6 of the retaining elements 2 arranged in the housing halves 100 and 200 engage behind the rear wall 8 of the connector 1 and thus snap into place by the spring force of the spring arms 5. In this position, the connector 1 is securely held in the housing. Finally, the cable is firmly connected to the cable holder 9 with a crimp connector, thus ensuring strain relief for the cable connection.

[0049] By means of an attack opening 54, as in Figure 11 As shown, the formwork elements 100 and 200 of the housing can be separated again by inserting a tool and separating the connection of the locking elements 11 to 14 with the counter-locking elements 21 to 24 of the shell elements 100 and 200. Reference symbol list

[0050] 1 Connector 2 Retaining element 3 Receptacle 4 Retaining mechanism 5 Spring arm 6 Locking lug 7 Receptacle 8 Rear wall 9 Cable holder 10 Locking lug 11 Locking element 12 Locking element 13 Locking element 14 Locking element 15 Clearance 16 Cover 17 Surface 18 Surface 19 Base body 20 Receptacle 21 Counter-locking element 22 Counter-locking element 23 Counter-locking element 24 Counter-locking element 25 Bead 26 Recess 31 Positioning element 32 Positioning element 33 Positioning element 34 Positioning element 35 Positioning element 40 Contact surface 41 Counter-positioning element 42 Counter-positioning element 43 Counter-positioning element 44 Counter-positioning element 45 Counter-positioning element 50 Contact surface 51 Cable opening 52 Cable opening 53 Cable opening 54 Access opening 60 contacts 100 shell element 200 shell element

Claims

1. A connector assembly with a housing for the connector assembly, with a lower shell element (100) and an upper shell element (200) which is identical to the lower shell element (100), wherein a retaining element (2) is arranged in each shell element (100, 200), by means of which a connector (1) is secured to the housing, and wherein in each shell element (100, 200) a receptacle (3) is provided in which a cable holder (9) is receivable, and wherein each shell element (100, 200) comprises at least one latching element (11, 12, 13, 14) which cooperates with a corresponding counter-latching element (21, 22, 23, 24) of the respective other shell element (200, 100), wherein the latching elements (11, 12, 13, 14) and the counter-latching elements (21, 22, 23, 24) are formed in a multi-stage manner, that means step-shaped with at least two stages analogous to stair steps, characterized in that the entire boundary regions between the shell elements (100, 200) forming the housing, with the exception of openings for the connector (1) and the cable holder (9), are formed also in a multi-stage manner, that means step-shaped with at least two stages analogous to stair steps, wherein a contact surface (40) is provided on the retaining element (2), against which a contact surface (50) of the connector (1) bear in a mounting position, wherein the retaining element (2) comprises a retaining mechanism (4) which cooperates with the connector (1) in such a way that the connector (1) is securely and captive retained in the housing in the mounting position, wherein the retaining mechanism (4) of the retaining element (2) comprises at least one spring arm (5) on which a latching lug (6) is arranged, and which is configured to engage with a recess (7) within a rear wall (8) of the connector (1), wherein, in the mounting position, the latching lug (6) engages behind the rear wall (8) of the connector (1).

2. The connector assembly according to claim 1, characterized in that in the receptacle (3) for the cable holder (9) a recess (26) is provided, into which a bead (25) of the cable holder (9) is receivable.

3. The connector assembly according to any one of the preceding claims, characterized in that the retaining element (2) arranged in the respective shell element (100, 200) is formed as a separate component insertable into the respective shell element (100, 200).

4. The connector assembly according to claim 3, characterized in that in the shell elements (100, 200) at least one positioning element (31, 32, 33, 34, 35) is provided which cooperates with a counter-positioning element (41, 42, 43, 44, 45) of the respective retaining element (2).

5. The connector assembly according to claim 4, characterized in that at least one positioning element (31, 32, 33, 34) of the shell element (100, 200) is formed as a guide element which cooperates with a counter-positioning element (41, 42, 43, 44) of the retaining element (2), which is formed as a counter-guide element.

6. The connector assembly according to any one of the preceding claims, characterized in that latching lugs (10) are arranged on the retaining element (2), which, in the mounting position, engage in receptacles (20) of the shell elements (100, 200) and thereby retain the respective retaining element (2) in a captive but preferably movable manner in the corresponding shell element (100, 200).

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