Electrical plug connector and seal for such a plug connector

Abstract

The present invention relates to an electrical plug connector, in particular a built-in plug connector, comprising a housing (1) with a connecting flange (3), the connecting flange having a notch (4) for receiving a fastening means (5), a flange plate (10) with a mounting hole (12) for connecting to a housing wall (G), a switchboard, or the like, and a seal (17) inserted therebetween. The outer edge (14) of the flange plate (10) is bent toward the housing (1) and covers the outer edge of the connecting flange (3). The seal (17) projects into the insertion opening (2) with a surrounding sealing lip (18) and has an edge (19) bent toward the housing (1), which grips the outer peripheral edge of the connecting flange (3) and is itself covered by the outer edge (14) of the flange plate (10). In the assembled state, the circumferential edge (14) of the flange plate (10) extends up to the height of the rear side of the connecting flange (3), and the edge (19) of the seal (17) extends beyond the rear surface of the connecting flange (3).

Description

[Technical field]

[0001] The invention relates to an electrical plug connector, in particular a built-in plug connector as claimed in the preamble of claim 1 and to a 9 The present invention relates to a seal for a plug connector of this kind, as described in the preamble of . [Background technology]

[0002] Built-in plug connectors or chassis bushings are built into the housings of electrical appliances, switchboards or similar arrangements for connecting these devices with electrical conductors which carry at least one end a cable plug connector of complementary design to the built-in plug connector, which can be electrically connected thereto and mechanically locked against inadvertent disconnection.

[0003] Built-in plug connectors typically have a housing with a plug-in opening for a complementary plug connector, with an overhanging coupling flange projecting at the plug-in end of the housing, which coupling flange has a recess for the passage of a fastening means, and a plug-in flange plate is provided which has a plug-in opening for the complementary plug connector and a mounting opening for connection to an appliance wall, a switchboard or the like.

[0004] Patent document 1 (China Utility Model No. 204516967(U)) discloses an assembled plug connector, in which a substantially flat seal plate is inserted between a flange plate and a coupling flange provided on a housing, and seals the coupling of these two components. If it is desired to seal the entire assembled plug connector against a housing wall, such as a switchboard, into which the assembled plug connector is inserted, an additional seal must be provided between the assembled plug connector and the housing wall, which makes the assembly more complicated and slower, and also requires additional components.

[0005] A seal for sealing at least one flange plate of a built-in plug connector is known and is used, for example, in the SE8FD-TOP built-in set. This seal is formed as a substantially flat sealing plate and has a central cut-out at the plug-in opening of the built-in plug connector. By positioning it between the appliance wall, switchboard, etc. and the flange plate with the plug-in opening for the complementary plug connector, dust, moisture, etc. are prevented from penetrating into the interior of the appliance or switchboard.

[0006] And at least one fastening means, typically a bolt, is used to fasten the housing, flange plate and seal to an instrument wall, switchboard or the like.

[0007] Patent document 2 (US 2007 / 0141886) discloses an electrical connector in which the outer edge of a flange plate is bent upward toward the housing and covers the outer edge of a connecting flange. The seal of this connector has a circumferential seal lip that protrudes radially at the insertion opening, and the seal has an edge that is bent toward the housing and engages with the outer edge of the connecting flange, itself covered by the outer edge of the flange plate. In the assembled state, the peripheral edge of the flange plate protrudes to the height of the rear part of the flange plate of the housing, and the seal edge that protrudes toward the housing protrudes around the entire circumference of the connecting flange on its rear side. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] China Utility Model No. 204516967(U) Specification [Patent Document 2] US Patent Application Publication No. 2007 / 0141886 Summary of the Invention [Problem to be solved by the invention]

[0009] The object of the present invention is to overcome the drawbacks of the prior art and to provide a sealed built-in plug connector that can be installed by the end user easily and quickly without additional components and with standard tools, and that is as comprehensive as possible. [Means for solving the problem]

[0010] This issue is Claims 1 and 9, respectively This is solved by the apparatus and method described in. Further features are contained in the dependent claims.

[0011] The device according to the invention is characterized in that at the location of the mounting opening, a sealing grommet is formed in the seal, which overhangs in the direction of the flange plate. In the assembled state, the sealing grommet extends into the mounting hole of the flange plate and has a preferably bush-shaped extension in the direction of the connecting flange of the housing. The outside diameter preferably corresponds to the inside diameter of the mounting hole or the bush-shaped extension, the sealing grommet ending in the assembly bore above the lower end of the receiving area for the head of the fastening means. A further improvement of the sealing effect can be obtained, in that on the one hand the ingress of moisture, dirt or dust is also prevented via the mounting hole, but nevertheless the fastening means, in particular the screw head, can clearly feel a hard abutment on the flange plate.

[0012] Further optimization of the sealing action is achieved if the inner diameter of the sealing grommet corresponds at a minimum to the outer diameter of the fastening means and thus all surfaces are in tight contact with one another.

[0013] Preferably, the inner side of the outer edge of the flange plate bent towards the housing is bevelled towards the outside, and the outer side of the circumferential edge of the seal is also bevelled towards the outside, preferably complementary thereto, so that when mating or fastening to the appliance wall or switchboard by means of defined fastening means, the edge of the seal is slightly compressed and pressed against the surface of the appliance wall or switchboard, whereby a particularly good sealing effect is obtained.

[0014] In an alternative embodiment of the plug connector according to the invention, in the assembled state, the surrounding edge of the flange plate ends before the rear height of the flange plate of the housing and the outwardly projecting surrounding sealing edge covers at least a part of the thickness of the flange plate edge bent towards the housing, thus avoiding a shearing effect on the bevelled inner side of the flange plate and providing the sealing effect by a force acting perpendicularly on the sealing edge.

[0015] According to a preferred embodiment of the invention, the plug connector is additionally characterized in that the flange plate has a retaining pin that projects toward the housing and the connecting flange has a corresponding retaining hole into which the end of the retaining pin can be inserted. The retaining hole is preferably defined by a ring that rises above the connecting flange and the seal covers this ring by means of a centrally open dome that presses against it. Thus, the flange plate and the housing are connected to one another sufficiently well with the seal inserted therebetween that they are prevented from falling apart and the plug connector can be treated as a common component. Furthermore, the retaining pin can be arranged in the case of a retaining hole that passes completely through the connecting flange so as to abut against the front side of the housing wall, switchboard, etc., and thus exert a space-retaining effect in order to limit the effect on the seal and thus prevent damage to it.

[0016] In order to ensure a sealing effect also for the retaining hole, the central opening of the dome preferably has a diameter slightly smaller than the outer diameter of the seal opening and / or the retaining pin, so that a tight insertion of the retaining pin and a good friction-based seal between the seal and the retaining pin are also guaranteed.

[0017] Preferably, the plug connector is configured in such a way that the flange plate has a circumferential groove surrounding the plug opening and in which groove is accommodated a strip that protrudes beyond the surface of the seal and radially surrounds the sealing lip for the plug opening on the outside, which strip, in addition to optimal centering of the seal and the flange plate relative to one another, also acts as an additional sealing strip and thus enhances the sealing action.

[0018] In many cases of plug connections, it is desirable to prevent the connection from being accidentally disconnected. For this purpose, a locking arrangement is provided between the complementary plug connectors, which must be unlockable by operating an operating member in order to release the plug connection as desired. In a preferred embodiment of the plug connector according to the invention, therefore, a recess extends radially outward from the plug opening in the flange plate, through which an operating member for the locking mechanism projects outward from the housing towards the front side of the flange plate in the assembled state. In order to also optimally seal this widening of the plug opening, a dome that is raised beyond the sealing surface then extends outward through the recess towards the front side of the flange plate, radially contiguous with the plug opening. The operating member is therefore covered by the dome.

[0019] In order to achieve the object set out at the outset, a seal has been conceived, in particular for an electrical plug connector, in particular for a built-in plug connector, in particular for a plug connector according to one of the above paragraphs, in order to optimally seal said plug connector against an appliance wall, a switchboard, etc. This seal has a central cut-out at the location of the plug connector's plug opening and a recess at the location of the mounting hole for the plug connector.

[0020] The invention is particularly characterized in that at the location for the insertion of the fastening means a sealing grommet is arranged with a central insertion portion for the fastening means which protrudes beyond the front surface of the seal, so that the assembled plug connector can be mounted with an optimal seal even at the location of the fastening means.

[0021] In this case, the sealing structure preferably has a surrounding sealing strip, which allows a reliable linear seal. Preferably, in this case, the outer side of the surrounding edge of the seal is cut obliquely toward the outside, so that only a part of the fastening force acting perpendicularly on the seal is converted into a pressing force and this pressing force is thereby limited.

[0022] In an alternative embodiment, a seal is provided in which the seal structure is a radially outwardly flaring, circumferential seal edge, thus avoiding undesirable shearing effects on the outer edge of the seal, and the seal edge is pressed perpendicularly against the instrument wall, switchboard, etc.

[0023] Another preferred embodiment of the seal according to the invention is characterized in that a dome with a central through hole for the spacing pin is arranged at the location for the insertion of the retaining pin, raised above the front surface of the seal.

[0024] This type of seal is well suited for use in built-in plug connectors where the flange plate and housing can be at least provisionally coupled to one another in these components by cooperating retaining pins and retaining holes.

[0025] For a built-in plug connector with a locking arrangement and an operating member for unlocking it, a seal is optimally provided according to the invention which has a dome which is radially continuous with the plug opening and which rises beyond the front surface of the seal, below which the operating member of the locking arrangement can be accommodated, the dome then being preferably formed integrally with the seal.

[0026] A good centering of the seal relative to the flange plate is preferably ensured by a strip that extends beyond the front surface of the seal and radially outer surrounds the sealing lip for the plug opening, which strip provides an additional sealing edge and additionally improves the sealing action.

[0027] In order to hold the assembled plug connector tightly even when the complementary plug connector is not plugged in, the seal is preferably formed with at least one radially extending connecting strip, on whose outer end a sealing plug is fixed, the outer diameter of which is slightly larger than the inner diameter of the sealing lip of the plug opening. In order to save material, this sealing plug is preferably formed with a cup-shaped cutout.

[0028] Preferably, the sealing plug has a full-length gripping flap protruding from the side facing the connecting strip, which essentially facilitates operation. This gripping flap is preferably also cup-shaped and, in the inserted state of the sealing plug, covers and protects the dome, which in turn covers and seals the operating member of the locking arrangement.

[0029] For a better understanding of the present invention, the invention will now be described in detail with reference to the following figures.

[0030] The figures are each highly simplified schematic representations. [Brief description of the drawings]

[0031] [Figure 1] 1 is a perspective view showing a first embodiment of a built-in plug connector according to the present invention, obliquely viewed from above and the front; [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 4 is a cross-sectional view of the assembled plug connector of FIGS. 1 to 3, exactly through the central plane. [Diagram 5] A cross-sectional view in a parallel plane including the central axis of the fixing hole and the retaining pin. [Figure 6] FIG. 2 is a detailed cross-sectional view in the area of ​​the fixation hole with the fixation screw inserted. [Figure 7] FIG. 2 is a detailed cross-sectional view in the area of ​​the fixation hole with the fixation screw inserted and tightened. [Figure 8] 1 shows a preferred embodiment of a seal for a built-in plug connector in enlarged dimensions. [Figure 9] 13 is a perspective view showing another embodiment of the built-in plug connector according to the present invention, obliquely viewed from above and the front. FIG. [Figure 10] FIG. 8 is a cross-sectional view of the assembled plug connector of FIG. 7, shown exactly in the central plane. [Figure 11] 13 is a cross-sectional view of another embodiment of a built-in plug connector with stepped chamfered sealing edges; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] It should be noted at the outset that in differently described embodiments, identical parts are provided with the same reference signs or the same component names, and in that case the disclosure contained in the entire description can be meaningfully transferred to identical parts having the same reference signs or the same component names. Also, positional descriptions selected in the description, such as, for example, top, bottom, side, etc., refer to the figures directly described and shown, and this positional description can be meaningfully transferred to a new position if the position is changed.

[0033] In figure 1, a first embodiment of a built-in plug connector according to the invention is shown in a perspective view, by way of example, in the form of a chassis bush for a data plug, in particular for an RJ45 data plug. Of course, the structure according to the invention can also be transferred to other types of built-in plug connectors, which are illustrated in the further embodiments of figures 9 and 10, which show an XLR chassis bush.

[0034] In the following description, the same reference numerals or component names are used for the same parts, and in order to avoid unnecessary repetition, reference is made to or made to the detailed description already given.

[0035] The examples show possible implementation variations, which are recorded here as such, but the present invention is not limited to the implementation variations specifically shown, but rather the individual implementation variations can be combined with each other in various ways, and these variations are within the scope of the discretion of a person skilled in the art based on the teachings for technical operation of the present invention.

[0036] The electrical plug connector of FIG. 1 (shown in detail in an exploded perspective view in FIG. 3) has a housing 1 with a plug opening 2 for a complementary plug connector (not shown). At the front, plug-in end of the housing 1, an overhanging connecting flange 3 is provided, which overhangs the housing 1 preferably at a right angle and preferably over its entire circumference. The connecting flange 3 has through-holes or partially open recesses 4, through which fastening means 5 for the built-in plug connector, e.g. fastening screws, rivets or the like, can be passed in order to fasten it in an appliance wall G, a switchboard or similar element (see FIG. 6 for this). The recesses 4 are preferably positioned at two ends of the here rectangular connecting flange 3, which are opposite each other with respect to the central axis of the plug opening 2. Of course, other contour shapes of the connecting flange 3 are possible, e.g. circular contours, polygonal contours, etc. All corners of the connecting flange 3 can also be provided with through-holes 4.

[0037] Elsewhere in the connecting flange 3, there are retaining holes 6, which are defined by a ring 7 that projects beyond the front side of the connecting flange 3. Typically, two retaining holes 6 are positioned at two opposite corners of the connecting flange 3 with respect to the central axis of the plug opening 2. Complementary retaining members of other components can be inserted into these retaining holes 6. Preferably, these retaining holes 6 are located in the center of the ring 7 that projects beyond the connecting flange 3.

[0038] And, positioned on or in the housing 1 are locking arrangements 8, 9, at least one of which, the locking member 9, can also be unlocked by means of an operating member 8. This operating member 8 projects forward beyond the plug-in end of the housing 1 and can thereby be easily reached by the user.

[0039] In the assembled state, the connecting flange 3 of the housing 1 faces the front side of the plug-in connector with a plug-in flange plate 10, which has a plug-in opening 11 for a complementary plug connector in a coaxial arrangement with the plug-in opening 2 of the housing 1. Furthermore, the flange plate 10 is formed with a mounting hole 12, which is positioned coaxially with the recess 4 in the connecting flange 3 and is designed to receive a fastening means 5 for the built-in plug connector for connection to an appliance wall, a switchboard or the like. At the location where the fastening element 8 is located, a radially outwardly extending recess 13 extends from the plug-in opening 11, through which the operating element 8 can protrude to the front side of the flange plate 10.

[0040] The outer edge 14 of the flange plate 10 is bent towards the housing 1 and covers the outer edge of the connecting flange 3 - this can be seen in the rear view of the assembled plug connector in figure 2 and in the cross section in figure 4. At the rear side of the flange plate 10 the mounting hole 12 has a preferably bush-shaped extension 15 in the direction of the connecting flange 3 and preferably extends all the way to it for contacting said connecting flange 3.

[0041] The flange plate 10 has a retaining pin 16 which projects towards the housing 1 at a position corresponding to the retaining hole 6 of the connecting flange 3. Its end is designed to be inserted and fixed in the retaining hole 6 of the connecting flange 3. If necessary, the retaining pin can be introduced completely into the retaining hole 6 until it comes into contact with the housing wall, switchboard or the like and can also act as a spacer.

[0042] A preferably plate-shaped seal 17 for sealing against a housing wall G, a switchboard or the like is inserted directly between the flange plate 10 and the connecting flange 3 of the housing 1 and is held between these components. This seal 17 has a central cut-out 30 which corresponds in size at least to the plug opening 2 and is arranged coaxially with respect to said plug opening. The central cut-out 30 is preferably bounded by a surrounding sealing lip 18 which projects radially into the plug opening 2 and seals off the ring-shaped gap of the plug opening 2 when a complementary plug connector is inserted.

[0043] The edge 19 of the seal 17 is bent in the region of the flange plate 10 and the connecting flange 3 towards the housing 1 and grips the peripheral edge of the connecting flange 3 with the bent edge strip 19. The bent edge 19 of the seal 17 is itself covered by the bent outer edge 14 of the flange plate 10. The relative thicknesses of the seal 17 and the connecting flange and the height of the outer edge 14 are selected so that the circumferential edge 14 of the flange plate 10 in the assembled state extends up to the height of the rear side of the connecting flange 3 of the housing 1 and the edge 19 of the seal 17 extending in the direction of the housing 1 extends over the entire circumference beyond the rear face of the connecting flange 3 so that when the built-in plug connector is installed it is finally pressed against the wall of the appliance housing, switchboard or the like and fulfills the sealing function. At the location of the mounting hole 12 of the flange plate or the recess 4 of the connecting flange 3, the seal 17 is also formed with a through hole 20.

[0044] As can be seen clearly in figures 6 and 7, in a preferred embodiment of the invention, the bent edge 14 of the flange plate 10 is bevelled outwards on the inside. The seal 17, and in other words its bent edge 19, is also bevelled outwards, preferably complementary to the inclination of the flange plate 10. When tightening the fixing screw 5 in the process of mounting the built-in plug connector, as shown in figure 7, the edge 19 of the seal 17 is pressed against the appliance wall G, the switchboard or the like, in which case the seal is preferably completely covered and protected by the flange plate 10. Alternatively, the construction shown in figure 11 can be selected, in which the surrounding edge 14 of the flange plate 10, in the assembled state, is covered by a surrounding outwardly projecting sealing edge 31, which ends before the rear height of the connecting flange 3 of the housing 1 and which covers at least a part of the thickness of the bent edge 14 of the flange plate 10 towards the housing 1.

[0045] 6 to 8, according to a preferred embodiment, the seal 17 at the location of the mounting hole 12 has a sealing grommet 21 formed therein, which protrudes in the direction of the rear side of the flange plate 10. In the assembled state, this sealing grommet 21 extends into the mounting hole 12 of the flange plate 10, in particular also into its bush-shaped extension 15, with its outside diameter preferably corresponding to the inside diameter of the mounting hole 12 or of the extension 15. The inside diameter is determined here in the section in which the shaft of the fastening means, and thus preferably the threaded portion of the fastening screw 5, is received in the mounting hole 12.

[0046] In the unloaded state, the sealing grommet 21 ends - as shown in FIG. 6 - slightly above the lower edge of the receiving area for the head of the fixing screw 5 in the mounting hole 12. After tightening the fixing screw 5, the material of the sealing grommet 21 is sandwiched between the tightened fixing screw 5 and the flange plate 10 until it presses against the inside of the mounting hole 12 of the flange plate 10, thereby sealing the area of ​​the screw head.

[0047] The inner diameter of the sealing grommet 21 should preferably be larger than the outer diameter of the fastening means, in particular of the fastening screw 5, the outer diameter being the nominal diameter of the thread. At a minimum, the inner diameter of the through hole 20 of the sealing grommet 21 corresponds to the outer diameter of the fastening screw 5 in the unloaded state, as shown in FIG. 6. When the fastening means 5 is fully tightened, on the other hand, the sealing grommet 5 is compressed and the material of the sealing grommet 21 presses against the inner wall of the mounting hole 12 and penetrates between the threads of the fastening screw 5, resulting in the situation shown in FIG. 7. Together with the positive fit in the region of the screw head, this results in an optimal sealing effect over the entire height of the sealing grommet 21.

[0048] At the location of the retaining hole 6 in the connecting flange 3, the seal 17 preferably has a dome 22 rising above its surface, which overlaps abuttingly with the ring 7 when the mounting plug connector is assembled. This dome 22 has a central opening 23 for the passage of the retaining pin 16 of the flange plate 10, the diameter of which is preferably slightly smaller than the diameter of the retaining hole 6 and / or of the section of the retaining pin 16 which is to be introduced into the retaining hole 6.

[0049] Further structures raised beyond the surface of the seal 17 are a strip 24 or turn-up which radially outwardly surrounds the sealing lip 18 for the bayonet opening 2 and a central cut-out 30. This strip 24 is received in a corresponding groove 25 which coaxially surrounds the bayonet opening 11 in the assembled condition of the seal 17 and flange plate 10.

[0050] In the region where the operating member 8 projects through the flange plate 10 in the assembled state, the strip 24 likewise passes over the surface of the seal 17 and merges into a dome 26 which rises in its height further above the height of the strip 24. This dome 26, which is preferably formed integrally with the seal 17, likewise projects over the front side of the flange plate 10 and allows the user to operate the operating member 8 and thus unlock the complementary plug connector which has been inserted into the mating plug connector, which has until then been held in the plug opening 2 of the housing 1 by the locking member 9.

[0051] In addition to sealing the plug opening 2 by the sealing lip 18 of the seal 17 when a complementary plug connector is plugged in, there is also a need for the possibility of sealing in the unplugged state. For this purpose, the seal 17 is provided with at least one radially extending connecting strip, below which the edge area 14 of the flange plate 10, bent towards the housing 1, protrudes. Preferably - as shown in the figures - two connecting strips 27 of this kind are provided in the seal 17 in an approximately parallel or slightly V-shaped arrangement. At the outer ends of these connecting strips 27, a sealing plug 28 is fixed, the outside diameter of which corresponds at most to the inside diameter of the plug openings 2, 11 and is preferably slightly larger than the inside diameter of the sealing lip 18 of the seal 17 which seals the plug opening 2. Preferably, the sealing plug 28 is formed in an open cup shape.

[0052] To facilitate the manipulation of the sealing plug 28, a full-surface gripping flap 29 projects from the sealing plug 28 on the side facing the connecting strip 27. This gripping flap 29 is preferably likewise open and cup-shaped, with its opening oriented in the same direction as the dome 26 sealing the operating member 8 and aligned with the central axis of this dome 26 and the plug opening 2. In this way, when the connecting strip 27 is folded back to insert the sealing plug 28 into the plug opening 2, the dome 26 is simultaneously covered and protected by the cup-shaped gripping flap 29.

[0053] FIG. 11 shows a cross section of another embodiment of a built-in plug connector having stepped edged sealing edges. By pressing the assembled plug connector against a housing wall, switchboard or the like until the edge of the flange plate rests against this wall, the sealing edge which projects backwards beyond the mating flange is pressed firmly against the wall and is crushed to fill this volume between the mating flange and the edge of the flange plate. The seal is located between the mating flange and the flange plate protected against damage before, during and after assembly. The plug-in opening is sealed by a surrounding sealing lip when the complementary plug connector is inserted, and the seal against the appliance housing or switchboard is guaranteed by the bent edge of the seal, which is protected by the flange plate. The components flange plate, seal and housing with mating flange can be assembled at the factory and are available as a commonly operable component by the end user.

[0054] The protection area is defined by the claims. However, the description and the drawings should be used to interpret the claims. Individual features and feature combinations of the various embodiments shown and described may represent independent inventive solutions in themselves. The problem on which the independent inventive solution is based can be read off from the description.

[0055] Finally, it should be pointed out that, for the sake of formality, the elements are in some cases not to scale and / or are enlarged and / or reduced in size in order to allow a better understanding of the structure. [Explanation of symbols]

[0056] 1. Housing 2 Insertion opening 3 Connection flange 4. Cutout 5 Fixing screw 6 Retention hole 7. Ring 8 Operating member 9 Locking member 10 flange plate 11 Insertion opening 12 Mounting holes 13 Cutout 14 Bent Edges 15 bush-shaped extension 16 retaining pin 17 Seal 18 Seal Lip 19 Bent Edges 20 holes 21 Seal Grommet 22 Dome 23 Central opening 24 Strips 25 grooves 26 Dome 27 combined strips 28 Closure valve 29 Grasping flap 30 Center cutout 31 Seal edge G fixture wall

Claims

1. An electrical plug connector, in particular a built-in plug connector, comprising: The connector comprises a housing (1) with an insertion opening (2) for a complementary plug connector, and at the insertion end of the housing (1) a protruding connecting flange (3) projects, said connecting flange having a notch (4) for receiving a fastening means (5), a plug-in flange plate (10) with a plug-in opening (11) for a complementary plug connector and mounting holes (12) for coupling with an appliance wall (G), a switchboard and the like; a seal (17) with a central cutout (30) in the area of ​​the plug opening (2) inserted between the connecting flange (3) and the flange plate (10), said seal (17) having a surrounding sealing lip (18) projecting radially into the plug opening (2); at least one fastening means (5) for fastening the housing (1), the flange plate (10) and the seal (17) to an instrument wall (G), a switchboard or the like; the outer edge (14) of the flange plate (10) is bent towards the housing (1) to cover the outer edge of the connecting flange (3), the seal (17) has an edge (19) bent towards the housing (1) at the rear side, said edge gripping the outer edge of the connecting flange (3) and said edge (19) itself being covered by the outer edge (14) of the flange plate (10), in the assembled state of the plug connector and before the fastening means (5) is fully tightened, the outer edge (14) of the flange plate (10) overhangs up to the height of the rear side of the connecting flange (3) of the housing (1), and the edge (19) of the seal (17) overhanging towards the housing (1) overhangs beyond the rear face of the connecting flange (3) over the entire periphery, forming or comprising a sealing structure; In things, 1. An electrical plug connector, comprising: a seal grommet (21) formed in the seal (17) at the location of the mounting hole (12), said seal grommet protruding high in the direction of the flange plate (10), said seal grommet (21) extending into the mounting hole (12) of the flange plate (10) in the assembled state of the plug connector and before the fastening means (5) are fully tightened, said seal grommet (21) having an outer diameter corresponding to the inner diameter of the mounting hole (12), and said seal grommet (21) terminating in the mounting hole (12) above the lower edge of the receiving area for the head of the fastening means (5).

2. The inner side of the outer edge (14) of the flange plate (10) bent toward the housing (1) is cut obliquely toward the outside, and the outer side of the edge (19) of the seal (17) is likewise bevelled outwards, preferably complementary thereto; 2. The plug connector according to claim 1 .

3. 2. A plug connector as claimed in claim 1, characterized in that in the assembled state of the plug connector and before the fixing means (5) are fully tightened, the outer edge (14) of the flange plate (10) ends before the rear height of the connecting flange (3) of the housing (1) and the outwardly protruding sealing edge (31) which goes around covers at least a part of the thickness of the outer edge (14) of the flange plate (10) bent towards the housing (1).

4. 2. A plug connector according to claim 1, characterized in that the inner diameter of the sealing grommet (21) corresponds at least to the outer diameter of the fastening means (5).

5. The flange plate (10) has a retaining pin (16) that projects toward the housing (1), 5. A plug connector according to claim 1, characterized in that the connecting flange (3) has a corresponding retaining hole (6) into which an end of a retaining pin (16) can be inserted, the retaining hole (6) extending to the centre of a ring (7) rising beyond the connecting flange (3), and the seal (17) covering this ring (7) by a centrally open dome (22) abutting against it.

6. 6. A plug connector according to claim 5, characterized in that the central opening (23) of the dome (22) has a diameter slightly smaller than the outer diameter of the retaining hole (6) and / or the retaining pin (16).

7. 7. A plug connector according to claim 1, characterized in that the flange plate (10) has a circumferential groove (25) surrounding the plug opening (11), in which a strip (24) is received which radially outer surrounds a sealing lip (18) for the plug opening (2).

8. 8. A plug connector as claimed in claim 1, characterized in that in the flange plate (10), a notch (13) extends radially outward from the plug opening (11), and through the notch an operating member (8) for unlocking the complementary plug connector protrudes outward from the housing (1) to the front side of the flange plate (10) when the plug connectors are assembled and before the fastening means (5) are fully tightened, and a dome (26) radially continuous with the plug opening (11) extends outward through the notch (13) to the front side of the flange plate (10), the operating member (8) being covered by the dome (26).

9. A seal (17) for a plug connector according to any one of claims 1 to 8, for sealing against an appliance wall (G) or the like, having a central cut-out (30) at the location of the plug connector's plug opening (2) and a notch (20) at the location of the mounting hole (12) for the plug connector, A sealing lip (18) encircling a central cutout (30) defines the inner periphery of the central cutout and has a bent edge (19) behind the seal (17) that rises beyond the rear face of the seal (17), the edge having a surrounding sealing structure disposed thereon or forming the sealing structure itself, A seal, characterized in that a seal grommet (21) with a central cutout (20) for the fastening means (5) is arranged at a position for the fastening means (5) to pass through.

10. 10. The seal according to claim 9, characterized in that the sealing structure of the edge (19) comprises a surrounding sealing strip, preferably with the outer side of the surrounding edge (19) of the seal (17) being cut obliquely towards the outside.

11. 11. The seal according to claim 9 or 10, characterized in that the sealing structure of the edge (19) is a surrounding sealing edge that projects radially outwards.

12. 12. The seal according to claim 9, characterized in that a dome (22) is arranged with a central opening (23) for the retaining pin (16) at a position through which the retaining pin (16) passes.

13. 13. A seal according to any one of claims 9 to 12, characterized in that a dome (26) is arranged radially continuous with the central cutout (30) and is preferably formed integrally with the seal (17).

14. 14. A seal according to any one of claims 9 to 13, characterized in that a strip (24) is provided which radially outer surrounds the central cutout (30).

15. 15. The seal according to claim 9, characterized in that the seal (17) is formed with at least one radially extending connecting strip (27), at the outer end of which a sealing plug (28) is fixed, the outer diameter of which is slightly larger than the inner diameter of the sealing lip (18) in the central cutout (30).

16. 16. The seal according to claim 15, characterized in that the sealing plug (28) has a gripping flap (29) protruding from its side facing the connecting strip (27), said gripping flap being preferably cup-shaped.

Images