CN211743514U

CN211743514U - Holding frame for a plug connector

Info

Publication number: CN211743514U
Application number: CN202020193280.3U
Authority: CN
Inventors: T.迪塞尔; L.霍普
Original assignee: Phoenix Contact GmbH and Co KG
Current assignee: Phoenix Contact GmbH and Co KG
Priority date: 2019-02-22
Filing date: 2020-02-21
Publication date: 2020-10-23
Anticipated expiration: 2030-02-21
Also published as: DE102019104559A1; CN111613931B; CN111613931A

Abstract

A retaining frame (1) for a plug connector is described and shown for receiving a plurality of contact plugs (2), having a base frame (3) with two mutually opposite side walls (4, 4 ') and two likewise mutually opposite end walls (5, 5'), wherein the two end walls (5, 5 ') are arranged perpendicular to the side walls (4, 4'), and wherein at least two elastic spring arms (6, 6 ') are provided on each of the two side walls (4, 4'), wherein the wall thickness of the spring arms (6, 6 ') is smaller than the wall thickness of the side walls (4, 4'). The holding frame according to the invention can be produced particularly simply by: the spring arms each have at least one inwardly projecting latching lug; at least one edge is formed on each of the side walls, said edge being arranged opposite the latching lug in a spaced-apart manner.

Description

Holding frame for a plug connector

Technical Field

The invention relates to a retaining frame for a plug connector for receiving a plurality of contact plugs, comprising a base frame having two side walls opposite one another and two end walls likewise opposite one another, wherein the two end walls are arranged perpendicular to the side walls, and wherein at least two elastic spring arms are provided on each of the two side walls.

Background

Such a holding frame serves to receive a plurality of contact plugs which can be inserted into the holding frame and which are formed by an insulating body having a rectangular cross section, in which insulating body different contact elements can be arranged. The contact plugs can be individually inserted into the holding frame, whereby the following possibilities exist: the holding frame is equipped with different contact plugs depending on the purpose of use. The holding frame with the contact plug is thus of modular design. The assembled holding frame can be inserted into a housing part of a plug connector and fixed, into which the corresponding contact plug is inserted, wherein the plug connector is intended to be fixed to a corresponding mating plug connector.

Various different holding frames are known from practice, which enable modular insertion of individual contact plugs. Some holding frames are thus formed of two hingedly connected frame halves, wherein the contact plugs are inserted into corresponding recesses in the holding frame in the open state of the holding frame and are held in their position in a form-fitting manner in the closed state of the holding frame. There are also retaining frames with a fixed basic frame in which the individual contact plugs are likewise inserted into the corresponding recesses in a first step. In order to clamp and fix the contact plug in the base frame, the fixing clip is fixed to the base frame in a second step. The fixing clip overlaps a projection formed on the front face of the contact plug and projects into a corresponding recess on the upper edge of the basic frame, so that the contact plug is fixed in its position. However, it is disadvantageous here that the securing clip must be released and removed when the contact plug is replaced. This can result in other contact plugs which are not to be replaced also not being able to be fixed in their position and thus slipping or even falling out of the holding frame.

EP 1801927B 1 discloses a retaining frame for a plug connector of plastic material, which is designed in one piece. In order to fix the contact plug to be inserted into the holding frame, the two mutually opposite side walls of the holding frame have a plurality of elastic wall sections separated by slits, in each of which a window-like opening is formed. The latching projections of the contact plug, which are formed on the end faces thereof, can thereby be inserted between the two wall sections lying opposite one another until the two latching projections snap into the window-like opening. However, it is disadvantageous here that the holding frame is made entirely of plastic, so that the webs formed above the window-like openings can absorb only a limited amount of force if tearing of the webs is to be avoided. With the holding frame known from EP 1801927B 1, the contact plug thus has additional latching arms which engage over the lower edge of the sleeve-shaped holding frame, so that two separate latching elements are formed.

In contrast, DE 102013112976B 4 proposes a holding frame consisting of a plurality of components. In addition to the basic frame made of an electrically conductive material, for example die-cast zinc, the holding frame has two opposite wing parts, each of which has a plurality of spring webs separated from one another by slits. In each case one latching window is formed in each of these webs for receiving a corresponding latching projection of the contact plug. The wing parts are preferably formed by spring-elastic sheet metal, so that the tabs have corresponding spring-elastic properties, which enable the contact plug to be inserted between two tabs facing each other until the latching projections formed on the contact plug snap into the latching windows of the tabs.

Since the installation space available for such a retaining frame in the housing part of the plug connector is small, the individual components can only have a comparatively small wall thickness. In particular, the wall thickness of the tab is small here, so that the wall thickness of the locking window or of the web surrounding the locking window is also small. In order to hold the contact plug securely with its latching projections in the latching windows, the latching projections of the contact plug must be securely inserted into the latching windows on the web. For this purpose, it is necessary for the tolerances of the outer dimensions of the contact plug to be very small and for the clear width between the two latching windows facing one another to be very small.

Disclosure of Invention

The object of the present invention is therefore to provide a holding frame which can be produced in a simple manner and at the same time enables the individual contact plugs to be reliably fixed in the holding frame. In this case, it is also possible to insert individual contact plugs into the holding frame and to replace them without problems.

This object is achieved by the features of claim 1 in respect of the holding frame mentioned in the opening paragraph. The retaining frame according to the invention is characterized in that the spring arms each have at least one inwardly projecting latching lug and that at least one edge is formed on the side walls of the base frame, which edge is arranged opposite the latching lug in a spaced-apart manner, so that the latching lug and the opposite edge are each used jointly for fastening the contact plug. In this case, the latching lugs are arranged in the insertion direction of the contact plug above or in front of the opposite edges of the side walls, respectively, so that the latching projections of the contact plug, when inserted into the holding frame, first slide past the latching lugs before they come into contact with the edges on the side walls. If the contact plug is inserted into the holding frame, its latching projections formed on both end faces are each held between a latching lug of the spring arm and a corresponding edge of the side wall, so that the contact plug does not fall out of the holding frame undesirably.

Since no latching windows are formed in the spring arms for the holding frame according to the invention, but rather latching lugs are formed as latching elements for the latching projections of the contact plug, the difference between the outer dimension of the contact plug and the clear width between two mutually opposite spring arms can be selected to be slightly larger. The inward extent of the latching lug or of its retaining edge can thus be varied relatively simply within certain limits, wherein the extent can in particular be configured to be greater than the wall thickness of the spring arm. This ensures that the latching projections of the contact plug are reliably bridged by the latching lugs and thus reliably fixes the contact plug in the holding frame.

In order to facilitate the insertion of the contact plug into the holding frame, the latching lugs each have an insertion ramp, which is formed above the holding edge of the latching lugs in the insertion direction of the contact plug. When the contact plug is inserted into the retaining frame, the latching projections of the contact plug thus first slide along the insertion ramp, with the elastic spring arms being deflected slightly outward until the latching projections have passed the retaining edge of the latching lugs. The spring arms then spring back, thereby preventing the contact plug from undesirably falling out of the holding frame. If the contact plug is to be replaced, only a slight outward deflection of the two spring elements opposite one another is necessary until the latching projections no longer overlap the latching lugs. The contact plug can then simply be removed from the holding frame, while the other contact plugs remain fixed in their position.

In a further advantageous embodiment of the invention, the spring arms each have two lateral guide ribs which extend on both sides of the latching lugs in the insertion direction of the contact plug. This design also results in a simple insertion of the contact plug into the holding frame, since the contact plug is guided with its latching projections between the guide ribs during insertion and thus automatically reaches the correct position in the holding frame.

According to an alternative embodiment of the invention, the base frame has tabs on each side wall, which tabs project over an edge counter to the insertion direction of the contact plug, wherein the edge is arranged between two adjacent tabs. When inserted, the contact plug is guided with its latching projection between two adjacent webs, so that the webs assume the function of the aforementioned guide ribs. If appropriate tabs are formed on the side walls of the basic frame, the elastic spring arms can be formed flat next to the latching lugs. The tabs and spring arms are preferably of the same height. Alternatively, however, the lug and the spring arm can also have different heights, the lug projecting slightly upward from the spring arm, for example.

It is mentioned at the outset that at least two elastic spring arms are provided on each of the two side walls. The spring arms can be made of the same material as the side walls of the base frame and are in particular connected integrally to the side walls, as is also the case with the retaining frames known from EP 1801927B 1. Alternatively, however, the spring arms and the side walls can also be separate components, the spring arms being fastened only to the side walls. In this case, the spring arms and the side walls of the basic frame can be made of different materials. The base frame can be made of metal, in particular a die-cast part, for example, while the spring arms are made of a spring-elastic material, in particular spring steel.

If the spring arms and the side walls are designed as separate components, it is preferably provided that at least two elastic spring arms of the side walls jointly form the side wing sections. The assembly of the spring arms with the holding frame is thereby simplified, in particular when the holding frame has a plurality of spring arms, for example six or eight spring arms, for each side wall. In the shoulder portions, the adjacent spring arms are then each separated from one another by a slit, so that the shoulder portions with the spring arms can be produced from thin spring steel simply by punching and optionally bending. The spring arms are separated from each other by a slit, whereby adjacent spring arms can be deflected independently of each other.

In this design of the invention, the wing parts preferably each have a fastening region for fastening to a side wall of the basic frame. In each case, at least one fastening element, for example a fastening tab, a fastening recess or a fastening pin, is formed in the fastening region, by means of which the fastening region of the wing part can be fastened simply to the side wall of the base frame, for which purpose corresponding fastening pins or fastening recesses can be provided on the side wall. Alternatively or additionally, the wing parts can also be fixed to the side parts by means of gluing, soldering or welding.

The fastening of the wing parts to the base frame can be carried out particularly simply and at the same time reliably in the following manner: the flap part is bent in the fastening region about the bending line B, so that the two sections of the flap part lie opposite one another at a distance. One section of the side wing part can then be arranged or fixed outside the base frame and one section can be arranged or fixed inside the base frame, so that the side wall of the base frame is partially sandwiched by the two sections of the side wing part.

The holding frame according to the invention preferably has a flange section on at least one end wall, via which the holding frame can be mechanically connected to the plug connector housing. If the holding frame is intended to be inserted into a metallic plug connector housing, the flange section has metallic connection contacts, which can be designed as pin or socket contacts. The holding frame can then be electrically connected to the metallic plug connector housing via the metallic connection contacts. If the holding frame is made of an electrically conductive material, for example a zinc alloy, a protective grounding can be achieved by the base frame in that the PE module inserted into the holding frame is electrically conductively connected to the metallic plug connector housing via the base frame or its flange section and the metallic connection contact.

According to an alternative embodiment of the holding frame according to the invention, the basic frame is made of an electrically non-conductive or poorly conductive material, preferably a composite material or plastic, which is electrically non-conductive or poorly conductive compared to metal. The base frame can then be produced, for example, by injection molding, which makes it possible to produce the base frame particularly easily. However, it is disadvantageous here that such a basic frame is not easily suitable for protecting the ground if the holding frame is inserted into a metallic plug connector housing.

In this embodiment of the holding frame, a recess is then preferably formed in at least one side wall of the basic frame, in which recess a metallic connecting element is arranged. The recess and the metallic connecting element are arranged and designed in such a way that an electrically conductive connection is produced by the connecting element from the at least one contact region to the at least one metallic connecting contact of the flange section. Both mechanical fastening and electrical connection to the plug connector housing accommodating the holding frame can then be achieved by the flange section. The electrically conductive connection required for the protective grounding is realized here by a metallic connecting element which is inserted into a recess in the base frame.

The contact regions of the metal connecting elements can in this case make electrical contact with corresponding contact plugs inserted into the holding frame, which contact plugs have the function of a grounding module or PE module (protective grounding). If the PE module has, for example, contact sections which project slightly inward into the holding frame, the contact regions of the metal connecting elements can be formed correspondingly on the inner side of the side walls.

In this case, it is preferred that the recesses are not formed only on one side wall, but on both side walls and additionally also on both end walls, wherein the recesses are then connected to one another and metallic connecting elements are arranged in all recesses or in all sections of the interconnected recesses. These recesses can be designed, in particular, as inwardly open grooves on the inner side of the side walls and the inner side of the end walls, into which grooves metallic connecting elements are inserted in a form-fitting and/or force-fitting manner in the form of wire elements or current bars. Alternatively, the metallic connecting element can consist of a readily meltable metal which is introduced into the recess in the base frame by means of metal casting.

Whatever the material of which the basic frame is made, it is preferably constructed in one piece. In this case, no further mounting step for producing the basic frame is required. Alternatively, however, it is also possible to manufacture the side walls and/or end walls of the basic frame as separate parts first, which are then connected to one another or assembled to form the basic frame.

Drawings

In particular, there are various solutions for designing and improving the holding frame according to the invention. For this reason, reference is made both to the claims referring to claim 1 and to the subsequent description of the preferred embodiments in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a perspective view of a first embodiment of a holding frame without and with a contact plug;

fig. 2 is a perspective view of a second embodiment of the holding frame without and with a contact plug;

fig. 3 is a perspective view of a third embodiment of a holding frame with an inserted contact plug;

fig. 4 shows the holding frame according to fig. 3 from below and in cross section;

FIG. 5 is a basic frame of the holding frame according to FIG. 3;

fig. 6 shows the wing parts of the holding frame according to fig. 1 from the inside and from the outside;

fig. 7 shows the wing parts of the holding frame according to fig. 2 from the inside and from the outside; and

fig. 8 shows the wing parts according to fig. 7 in cross section.

Detailed Description

Fig. 1 and 2 each show two fundamentally different embodiments of a holding frame 1 according to the invention in a perspective view from the top side, wherein "top side" refers to the following side of the holding frame 1: from this side, the contact plug 2 is inserted into the holding frame 1. Fig. 1a and 2a each show a holding frame 1 of a contactless plug 2, and fig. 1b and 2b show a holding frame 1 with two contact plugs 2 or one inserted contact plug 2. Whereas the holding frame 1 according to fig. 3 differs from the holding frame 1 according to fig. 2 only in its length. Although the holding frame 1 according to fig. 2 is provided like the holding frame 1 according to fig. 1 for receiving two contact plugs 2, a total of six contact plugs 2 can be inserted into the holding frame 1 according to fig. 3 in the insertion direction E.

In all exemplary embodiments, the holding frame 1 has a substantially rectangular basic frame 3, which is formed by two mutually opposite side walls 4, 4 'and two likewise mutually opposite end walls 5, 5', wherein the two end walls 5, 5 'are arranged perpendicularly to the side walls 4, 4'. For the exemplary embodiment shown in fig. 1 and 2, the two side walls 4, 4 'each have two elastic spring arms 6, 6', which are arranged opposite one another in pairs. For the holding frame 1 according to fig. 3, six elastic spring arms 6, 6 'are respectively provided on each side wall 4, 4'.

In fig. 4, the holding frame 1 according to fig. 3 is shown from below (fig. 4 a) and in cross section (fig. 4 b). It can be seen here that the longitudinal extension of the respective contact element 2 running parallel to the end walls 5, 5' corresponds to the distance between the inner surfaces of the two side walls 4, 4' of the basic frame 3, so that there is only a small gap between the outer surface of the end side of the contact element 2 and the inner surfaces of the side walls 4, 4 '.

Each spring arm 6, 6 'has an inwardly projecting latching lug 7, 7', which, together with the edges 8, 8 'on the side walls 4, 4', serves to fix a latching projection 9, 9 'of the contact plug 2, wherein the latching projections 9, 9' are formed on mutually opposite end faces of the contact plug 2. In this case, the respective latching lugs 7, 7' are each arranged above the opposite edge 8, 8' in the insertion direction E of the contact plug 2, so that the latching projections 9, 9' of the inserted contact plug 2 are held clamped or held with a small gap between the edge 8, 8' and the latching lugs 7, 7 '. This secures the contact plug 2 in its position both in the insertion direction E and opposite to the insertion direction E.

In order to facilitate the insertion of the contact plug 2 into the holding frame 1, the latching lugs 7, 7 'each have an insertion ramp 10 which is formed above the holding edge 11 of the respective latching lug 7, 7' in the insertion direction E of the contact plug 2. As a result, when the contact plug 2 is inserted into the holding frame 1, the latching projections 9, 9 'slide along the insertion ramp 10, the resilient spring arms 6, 6' being initially deflected slightly outward until the latching projections 9, 9 'have passed the corresponding holding edges 11 of the latching lugs 7, 7'. The spring arms 6, 6' then spring back, so that the latching lugs 7, 7' overlap the corresponding latching projections 9, 9' with their retaining edges 11 and thereby fix the contact plug 2 in the retaining frame 1 against undesired pulling out counter to the insertion direction E. Since the latching projections 9, 9' at the same time rest on the edges 8, 8' of the base frame 3 opposite the latching lugs 7, 7', the contact plug 2 is also fixed in its position in the plug-in direction E.

For the embodiment of the holding frame 1 shown in fig. 1, the spring arms 6, 6 'each have two lateral guide ribs 12, which run on both sides of the latching lugs 7, 7' in the insertion direction E of the contact plug 2. The contact plug 2 to be inserted is guided in the insertion direction E by the guide ribs 12 in such a way that the latching projections 9, 9 'each slide between two guide ribs 12 of the spring arms 6, 6'. This also ensures in a simple manner that the contact plug 2 is correctly positioned in the holding frame 1.

For the exemplary embodiment of the holding frame 1 shown in fig. 2, the base frame 3 has a plurality of webs 13 on the side walls 4, 4', wherein the webs 13 project over the edges 8, 8' counter to the insertion direction E of the contact plug 2. As can be seen from fig. 2 and in particular also from fig. 5, an edge 8, 8' is arranged between two adjacent webs 13. The webs 13 serve here for guiding the contact plug 2 to be inserted in the insertion direction E in such a way that each latching projection 9, 9' slides between two adjacent webs 13. In the second embodiment of the holding frame 1 according to the invention, the webs 13 thus have the same function as the guide ribs 12, which are formed on the spring arms 6, 6' in the first embodiment according to fig. 1.

It is also clear from fig. 5 that the latching projections 9, 9' of the respective contact plug 2 are positioned on the edges 8, 8' and between the webs 13, which shows the holding frame 1 according to fig. 3, wherein the spring arms 6, 6' are not mounted on the base frame 3. Without the spring arms 6, 6', the contact plug 2 rests with its latching projections 9, 9' only on the edges 8, 8 'on the side walls 4, 4'. The contact plug 2 can then also be easily removed from the holding frame 1 again counter to the insertion direction E, or can be dropped out of the holding frame 1 with a corresponding orientation of the holding frame.

For the exemplary embodiments shown in these figures, the two spring arms 6, 6' each jointly form a lateral wing section 14, wherein a slot 15 is formed between each of the two adjacent spring arms 6, 6', so that the spring arms 6, 6' can be displaced independently of one another. The individual contact plugs 2 can thus be inserted into the holding frame 1 independently of one another and can also be removed again from the holding frame 1 without the fixation of other adjacent contact plugs 2 already inserted into the holding frame 1 being impaired thereby.

As can be seen in particular from the separate views in fig. 6, 7 and 8 of two such wing parts 14, the wing parts 14 each have a fastening region 16 for fastening to a side wall 4, 4' of the basic frame. The wing parts 14 of the holding frame 1 according to fig. 1 are shown here in fig. 6 and the wing parts 14 of the holding frame 1 according to fig. 2 are shown in fig. 7. In both embodiments, the fastening region 16 has two free-stamped fastening tabs 17, which snap into corresponding fastening recesses 18 in the side walls 4, 4' of the base frame 3.

It can also be seen that the wing parts 14 are bent in the fastening region 16 about the bending line B, so that two spaced-apart

sections

19, 20 are formed opposite one another. If the wing parts 14 are fixed to the side walls 4, 4' of the basic frame 3, one section 19 of the wing parts 14 is located outside the basic frame 3 and the other section 20 is located inside the basic frame. The basic frame 3 or the respective side wall 4, 4' is thus partially sandwiched by the two

sections

19, 20 of the side wing portion 14. This ensures that the respective wing part 14 is securely fastened to the base frame 3, wherein the wing part 14 can still be produced in a simple manner. For this purpose, the wing parts 14 can be stamped out of flat spring steel and bent over accordingly, wherein the latching lugs 7, 7 'formed in the respective spring arms 6, 6' can preferably be produced by injection molding.

By the aforementioned design of the fastening regions 16 of the wing parts 14, these wing parts can be simply moved on the one hand onto the side walls 4, 4 'of the base frame 3, wherein the fastening on the side walls 14, 14' can even be carried out without tools. On the other hand, however, the wing part 14 can also be released again from the base frame 3 relatively simply, if it is necessary to replace the damaged wing part 14 or the damaged spring arms 6, 6' once.

If the spring arms 6, 6' or the wing parts 14 are configured as separate components from the base frame 3, this has the following advantages: the base frame 3 and the spring arms 6, 6' can be made of different materials. Spring steel is particularly suitable here as the material for the spring arms 6, 6' or the shoulder portions 14, since this allows simple handling and ensures the required spring elasticity. As can be seen from fig. 8, the extension of latching lug 7 is here significantly greater than the material thickness of spring arm 6. This ensures that the latching projections 9, 9 'of the inserted contact plug 2 are reliably overlapped by the retaining edges 11 of the latching lugs 7, even if the respective extension of the latching projections 9, 9' has a certain tolerance.

In the case of the holding frame 1 shown in the figures, flange sections 21, 21 'each having a metallic connecting contact 22 are also arranged on the two end walls 5, 5'. The connection contact 22 is designed here as a pin contact (fig. 4, left side) on one side and as a socket contact (fig. 3, left side) on the other side. The connection contacts 22 are each used to electrically connect the frame to the metallic plug connector housing.

Furthermore, an electrical connection can be produced between the holding frame 1 and the metallic plug connector housing by means of the flange sections 21, 21' and the connection contacts 22, so that a protective grounding can also be provided by means of the holding frame 1. For this purpose, either the base frame 1 is made of an electrically conductive material or metallic connecting elements are arranged in the base frame, via which connecting elements the electrical connection of the PE module to at least one metallic connecting contact is made. In order to receive metallic connecting elements, corresponding slots are then formed in the base frame, in which slots metal wires or current bars can be arranged as metallic connecting elements.

Claims

1. A retaining frame (1) for a plug connector for receiving a plurality of contact plugs (2), having a base frame (3) with two mutually opposite side walls (4, 4 ') and two likewise mutually opposite end walls (5, 5'), wherein the two end walls (5, 5 ') are arranged perpendicular to the side walls (4, 4'), and wherein at least two elastic spring arms (6, 6 ') are provided on each of the two side walls (4, 4'), wherein the wall thickness of the spring arms (6, 6 ') is smaller than the wall thickness of the side walls (4, 4'),

it is characterized in that the preparation method is characterized in that,

the spring arms (6, 6 ') each have at least one inwardly projecting latching lug (7, 7'), and

at least one edge (8, 8 ') is formed on each of the side walls (4, 4 '), which edge is arranged opposite the latching lugs (7, 7 ') in a spaced-apart manner, so that the latching lugs (7, 7 ') and the opposite edges (8, 8 ') are each used jointly for fastening the contact plug (2),

wherein the latching lugs (7, 7 ') are arranged in the plug-in direction (E) of the contact plug (2) above the opposite edges (7, 7 ') of the side walls (4, 4 '), respectively.

2. The holding frame (1) as claimed in claim 1, characterized in that two mutually opposite spring arms (6, 6') are biased outwardly into an open position for inserting the contact plug (2) and dropping it out, and spring back into a closed position when the contact plug (2) is inserted, in which the contact plug is secured against unintentional dropping out.

3. The holding frame (1) as claimed in claim 1 or 2, characterized in that the latching lugs (7, 7 ') each have an insertion ramp (10) which is formed above the holding edge (11) of the latching lugs (7, 7') in the insertion direction (E) of the contact plug (2).

4. The holding frame (1) as claimed in claim 1, characterized in that the latching lugs (7, 7 ') of the spring arms (6, 6 ') project inwardly so that they at least partially cover the latching projections (9, 9 ') of the inserted contact plug (2).

5. The holding frame (1) as claimed in claim 4, characterized in that the latching projections (9, 9 ') of the inserted contact plug (2) are covered by the latching lugs (7, 7') of the spring arms (6, 6 ') by more than the material thickness of the spring arms (6, 6').

6. The holding frame (1) as claimed in claim 1, characterized in that the spacing between the holding edge (11) of the latching lugs (7, 7 ') and the opposite edge (7, 7') of the side walls (4, 4 ') is greater than the extent of the latching projections (9, 9') of the inserted contact plug (2) in the insertion direction (E).

7. The holding frame (1) as claimed in claim 1, characterized in that the spring arms (6, 6 ') each have two lateral guide ribs (12) which run on both sides of the latching lugs (7, 7') in the plug-in direction (E) of the contact plug (2).

8. The holding frame (1) as claimed in claim 1, characterized in that the base frame (3) has a web (13) on each side wall (4, 4 '), which projects over the edge (8, 8 ') counter to the insertion direction of the contact plug (2), wherein the edge (8, 8 ') is arranged between two adjacent webs (13).

9. The holding frame (1) as claimed in claim 8, characterized in that the latching lugs (7, 7 ') of the spring arms (6, 6 ') are each arranged between two juxtaposed webs (13) of the side walls (4, 4 ').

10. The holding frame (1) as claimed in claim 8 or 9, characterized in that the spacing between the holding edge (11) of the latching lug (7, 7 ') and the opposite edge (7, 7') of the side wall (4, 4 ') is greater than the spacing between two juxtaposed webs (13) of the side wall (4, 4').

11. The holding frame (1) as claimed in claim 1, characterized in that at least two elastic spring arms (6, 6 ') of the side walls (4, 4 ') jointly form a side wing section (14), wherein adjacent spring arms (6, 6 ') are separated from one another by a slot (15) in each case.

12. The holding frame (1) according to claim 11, characterised in that the wing parts (14) each have a fastening region (16) for fastening to a side wall (4, 4') of the basic frame (3), wherein at least one fastening element, such as a fastening tab (17), a fastening recess or a fastening pin, is formed in each case in the fastening region (16).

13. The holding frame (1) according to claim 12, characterised in that the wing part (14) is bent in the fastening region (16) about a bending line (B) such that two sections (19, 20) of the wing part (14) are opposite each other at a distance, wherein one section (19) is arranged outside the basic frame (3) and one section (20) is arranged inside the basic frame.

14. The holding frame (1) as claimed in claim 1, characterized in that the spring arms (6, 6') are made of a spring-elastic metal, in particular spring steel.

15. The holding frame (1) according to claim 1, characterized in that a flange section (21, 21 ') is arranged on at least one end wall (5, 5') of the basic frame (3), said flange section having a metallic connection contact (22).

16. The holding frame (1) as claimed in claim 1, characterized in that the basic frame (3) consists of an electrically conductive material.

17. The holding frame (1) according to claim 15, characterised in that the basic frame (3) consists of an electrically non-conductive or poorly conductive material, a recess is formed in at least one side wall (4, 4 '), and at least one metallic connecting element is arranged in the recess, wherein the recess is arranged and the at least one metallic connecting element is formed such that an electrically conductive connection is produced by the connecting element from at least one contact region to at least one metallic connecting contact (22) of the flange section (21, 21').