VIBRATION-DAMPING CONTACT ELEMENT

The invention relates to a contact element for an electrical connector, with a socket portion for receiving a plug-in contact insertable into the contact element, with a conductor terminal, by means of which an electrical conductor is attachable in an electrically conductive manner, and with a retaining area, by means of which the contact element may be fastened to the connector. At least one main contact spring projects into a receiving area for the plug-in contact whereby a contact force may be exerted on the plug- in contact along a main contact spring path extending substantially transversely to the insertion direction of the socket portion.

Contact elements of the stated type are known from the prior art. They are connected generally permanently to an electrical conductor, and are then inserted into an associated connector or a receiving device. There, the contact elements receive the plug- in contacts of a mating connector, in order to connect these electrically to the electrical conductors connected to the contact elements. It is essential, in this case, to contact and retain the plug-in contacts inserted into the contact element as reliably as possible in the inserted state, it being necessary to ensure that the insertion forces are not so great or act so unfavorably on the plug-in contact as to hinder insertion of the plug-in contact.

If the contact elements are used in vehicles or machinery with moving parts, a problem arises of mechanical vibrations or oscillations acting on the contact element and the electrical conductor connected thereto. In the contact element, the vibrations may propagate into the socket portion, where they may cause wear to the contact points of the plug-in contact and to the contact element. Furthermore, contact may be interrupted as soon as the vibration forces become greater than the retaining forces applied by the contact element.

It is accordingly an object of the present invention to provide an improved contact element which retains an inserted plug-in contact with the greatest possible contact forces, while minimizing the impact of vibrations

This object is achieved according to the invention in that the at least one main contact spring extends substantially in the insertion direction and has a free end directed substantially away from an contact opening of the socket portion for inserting of the plug- in contact into the socket portion and has at least one support area, with which the main contact spring rests in an inserted position against the contact element, and in that the contact element, retained in the contact retaining area, is received in an outer body fitted to the contact element as a separate component

This solution has a number of advantages First of all, the plug-in contact cannot bump against the free end of the main contact spring on insertion through the contact receiving opening into the socket portion, avoiding bending or damaging it When, in the insertion position, a plug-in contact has been fully inserted into the contact element, the spring force may be increased as a result of the main contact spring resting against the additional bearing Thus, the contact force exerted by the main contact spring on the plug- in contact does not have to be absorbed solely at a root of the main contact spring, but rather is additionally dissipated via the bearing

Furthermore, receiving the contact element in an outer body has the additional advantage that the contact element may be received in vibratory manner in the outer body, which serves to fasten the contact element in the electrical connector In addition, elements, such as for example latching springs, which would otherwise have to be arranged on the contact element itself, may be formed on the outer body

The outer body may be used to receive the contact element in a connector element or merely serve to protect the contact element from harmful environmental influences. Any fixing mechanisms of the contact element, such as for example latching springs or positioning members, may be formed on the outer body. In this way, the contact retention section of the contact element may be of minimal size, which allows material to be saved or structural space to be reduced and provides more design options and space on the contact element for the functional elements thereof. The solution according to the invention may be combined as desired with the following further advantageous developments and further improved. Thus, in a first advantageous development the socket portion and the contact retention section are connected together in an articulated manner, the contact retention section and the conductor terminal being connected together substantially rigidly with regard to movement.

This possible development has the advantage that vibrations acting on the contact retention section directly or via the conductor terminal may be kept away or isolated from the socket portion, because they can only penetrate with difficulty into the socket portion via the articulated connection.

According to a further possible advantageous development, the articulated connection may take the form of a flex point formed in one piece from the socket portion and the contact retention section. In this way, both the material of the contact element and an otherwise electrically conductive material may be used. Depending on the particular requirements, the flex point may be so shaped that it ensures the desired vibration isolation between socket portion and contact retention section or even the absorption of vibrations occurring at that point and simultaneously fulfils stability requirements

corresponding to the particular conditions of use. The one-piece configuration of socket portion and contact retention section ensures constant contacting and helps to avoid connection points liable to damage.

Vibration isolation may be simply achieved in particular when provision is made, according to a further possible development, for the articulated connection to take the form of a substantially planar material bridge. Vibration relaying is hindered in particular for vibrations extending transversely of or perpendicularly to the planar material bridge.

According to a further possible development of the contact element, in the articulated connection the cross-section of the contact element may be reduced at least relative to the other regions of the socket portion. Thus, any vibration forces and resultant stresses are concentrated in the zone of reduced cross-section and the resilience of the material of the contact element may be utilised for vibration isolation and absorption.

According to a further possible advantageous development of a contact element according to the invention, a strain zone may be formed by at least one articulated connection, in which zone deflectability is increased relative to the deflectability of the socket portion and of the contact retention section at least in a longitudinal direction of the contact element and deformation occurring as a result of relative motion between socket portion and retaining area is concentrated. The damping zone may be designed in such a way that it may isolate vibration waves passing both longitudinally and transversely through the contact element from the socket portion or absorb them before they reach the socket portion.

Vibrations or oscillations may be kept more readily away from the contact points between the main contact spring and the plug-in contact in particular when, according to a further possible advantageous development of a contact element according to the

invention, a root of the at least one main contact spring, at which the at least one main contact spring is connected to the contact element, is arranged in an area which is retained on the socket portion by an articulated connection. The articulated connection in the area of the root of the main contact spring may advantageously also be arranged in such a way that it may keep residual vibrations arising in the socket portion away from the contact points between the main contact spring and the plug-in contact. This may be achieved, for example, in that the articulated connection at the root of the main contact spring displays a differently oriented articulation from the articulated connections retaining the socket portion. According to a further possible advantageous development of a contact element according to the invention, a top support may be arranged in the projection of the at least one main contact spring along the main spring deflection path, against which top support the main contact spring rests in an initial position. In the initial position, the plug-in contact has not been inserted into the contact element. Prior to insertion of a plug-in contact, the main contact spring is thus under pretension directed in the direction of a contact receiving area for the plug-in contact. Thus, a plug-in contact to be inserted into the contact element does not have to overcome the entire main spring displacement when displacing the main contact spring and insertion of the plug-in contact is made easier. Nevertheless, the contact or retaining forces acting on the plug-in contact in the inserted state may be kept at a high level in accordance with the particular spring constant, and the total spring displacement determines the retention force.

The main contact spring may then readily be held under pretension in particular when, according to a further possible advantageous development of a contact element according to the invention, at least one shoulder is formed on the at least one main contact

spring, by means of which shoulder at least one main contact spring rests on the limit stop. Thus, the contact surface of the main contact spring does not have to be used to support the main contact spring on the limit stop. Accordingly, the contact surface of the main contact spring or any contact points thereof or its free end may be designed in accordance with the particular requirements, without having in addition to fulfil a second function as bearing point.

Retaining forces acting on a plug-in contact inserted into the contact element may be further increased if, according to a further possible advantageous development of a contact element according to the invention, the contact element has at least one auxiliary contact spring, with which a contact force may be exerted on the plug-in contact along an auxiliary spring path extending substantially transversely of the insertion direction of the socket portion and of the main spring deflection path. The auxiliary spring exerts an additional retaining or contact force on the plug-in contact. This may be advantageous in particular if any torsional or rotational movements of the plug-in contact in the contact element are to be prevented.

According to a further possible advantageous development of a contact element according to the invention, the at least one auxiliary contact spring may act as a the limit stop. Thus, the main contact spring may be blocked or locked with the assistance of the auxiliary contact spring. The lock may be released on insertion of the plug-in contact into the contact element and reactivated upon withdrawal of the plug-in contact, whereby the mechanisms triggered in the contact element upon insertion of the plug-in contact are reversible.

To increase further the retaining or contact forces by pretensioning the auxiliary contact spring, it is possible, according to a further possible advantageous development of

a contact element according to the invention, for the at least one main contact spring to be a limit stop, located in a projection of the at least one auxiliary contact spring along the spring deflection path, for the auxiliary contact spring, on which the auxiliary contact spring rests in the initial position. A shoulder formed on the main contact spring may, according to a further possible advantageous development, perform twin functions, if the at least one shoulder of the main contact spring is the limit stop for the auxiliary contact spring.

According to a further possible advantageous development of a contact element according to the invention, the at least one support area may rest against a ceiling of the contact element in the insertion position. The contact forces to be dissipated into the support area of the main contact spring may thus be simply taken up by the ceiling of the contact element.

To prevent possible vibrations in the contact element from being introduced via the support area into the main contact spring, it is possible, according to a further possible advantageous development of a contact element according to the invention, for the contact element to have at least one resilient lamella, against which the at least one support area rests in the inserted position. The resilient lamella provides additional flexibility when supporting the main contact spring.

According to a further possible advantageous development of a contact element according to the invention, at least two contact points may be formed on the at least one main contact spring for contacting the plug-in contact. A plurality of contact points allows the retention force acting on a plug-in contact to be increased. Possible limitation of the retention force which may be produced in a single contact point due to limited flexural

strength of the contact spring may be circumvented by the formation of a plurality of contact points on the contact spring

To this end, according to a further possible development of a contact element according to the invention the at least one support area may be additionally arranged between the contact points and/or at a free end of the at least one main contact spring The contact force exertable with the main contact spring on a plug-in contact may thus be increased in accordance with the particular requirements by providing any desired number of contact points and support areas arranged between the contact points If, in addition, the free end of the contact spring is used to provide support, it is possible to provide at least two support areas for each contact point, the root of the contact spring also constituting a support area or a bearing point

According to a further possible advantageous development of a contact element according to the invention, a contacting area projecting into the receiving area may be formed on the receiving area substantially opposite the at least one main contact spring, in order to retain the plug-in contact between the main contact spring and the contacting area The contacting area may be so formed that it makes easier absorption at the contact element of the retaining forces exerted by the main contact spring on the plug-in contact and locally increases the rigidity of the contact element

In addition, the configuration of the contacting area may be conformed to the configuration of the contact spring and any contact points formed thereon, whereby a plurality of contact zones may be provided for contacting the plug-in contact

According to a further possible advantageous development of a contact element according to the invention, the contact element may have at least one positioning assistance for the insertion into the plug-in element With a positioning aid on the contact

element, the orientation of the contact element in the connector element may be defined, in order to prevent incorrect insertion.

In order to be able to lock a contact element according to the invention in a connector element, the contact element may, according to a further possible advantageous development, have a latching spring extending in the longitudinal direction, the free latching end of which is movable in a latching direction extending transversely of the longitudinal direction. A contact element according to the invention may thus be latched in place on insertion into a connector element and retained in the connector element.

According to a further possible advantageous development of a contact element according to the invention, the latching spring may be formed at the outer body. In this way, retention forces arising at the latching spring are not introduced directly into the contact element, but rather are transmitted to the contact element via the outer body. In addition, more possible embodiments for the latching spring and for further positioning and retaining means are available on the outer body than on the contact element itself, because the outer body does not have to fulfil the additional functions of the contact element contacting the plug-in contact and the electrical conductor, but may rather merely be used for protecting and fastening the contact element.

Retention of a contact element according to the invention with a latching spring may be improved if, according to a further possible development of a contact element according to the invention, the latching spring is divided at least in two at least section- wise in the longitudinal direction and the at least one positioning assistance extends at least section-wise between the at least two parts of the latching spring. The positioning assistance may also be used to ensure proper latching of the latching spring into an

opening in a connector element and to protect the latching spring from any damage or misoperation.

A contact element according to the invention may be readily manufactured in automated manner or on an industrial scale in particular when, according to a further possible advantageous development of a contact element according to the invention, the contact element is formed in one piece from a metal part. This also saves on material and reduces costs.

In addition, a one-piece configuration of a contact element according to the invention is advantageous when it comes to omitting any electrical connection points on the contact element which could be disadvantageous for the electrical conductivity of the contact element.

The invention is illustrated in greater detail below by way of example by means of advantageous embodiments and with reference to the drawings. The embodiments described merely represent possible developments, in which, however, the individual features, as described above, may be provided mutually independently or omitted.

In the drawings:

Fig. 1 is a plan view of a contact element according to the invention;

Fig. 2 is a side view of a contact element according to the invention with outer body positioned thereon; Fig. 3 is a front view of a contact element according to the invention with outer body positioned thereon;

Fig. 4 is a perspective view of a contact element according to the invention with and without an outer body positioned thereon and a schematic perspective view of an outer body for a contact element according to the invention;

Fig. 5 is a plan view of a contact element according to the invention with outer body positioned thereon;

Fig. 6 is a longitudinal section through a contact element according to the invention with outer body positioned thereon, along section line A - A in Fig. 5;

Fig. 7 is a cross-sectional view of a contact element according to the invention with outer body positioned thereon, along section line B - B in Fig. 6; Fig. 8 is a cross-sectional view of a contact element according to the invention with outer body positioned thereon, along section line C - C in Fig. 6;

Fig. 9 is a longitudinal section through a contact element according to the invention and an associated plug-in contact;

Fig. 10 is a cross-sectional view of a contact element according to the invention, along section line M - M in Fig. 9;

Fig. 1 1 is a longitudinal section through a contact element according to the invention with half-inserted plug-in contact;

Fig. 12 is a cross-sectional view of a contact element according to the invention with half-inserted plug-in contact, along section line M - M in Fig. 1 1; Fig. 13 is a longitudinal section through a contact element according to the invention with a plug-in contact inserted right into an end position;

Fig 14 is a cross-sectional view of a contact element according to the invention with a plug-in contact inserted right into an end position, along section line M - M in Fig 13

Firstly the structure of a contact element 1 configured according to the invention will be described with reference to Fig 1, which shows a plan view of a contact element 1 according to the invention The contact element 1 has a socket portion 2 for receiving a plug-in contact (not shown here) The socket portion 2 is connected via a neck 3 to a conductor terminal or receptacle 4 for attaching an electrical conductor (not shown)

The conductor terminal 4 is provided with an opening 5, which simplifies the attachment of an electrical conductor (not shown) to the conductor terminal 4 In addition, the conductor terminal 4 has a conductor crimp section 6 and an insulation crimp section 6', by means of which an electrical conductor (not shown) and its insulation may be secured and electrically connected to the conductor terminal 4

In addition, the contact element 1 is provided with a carrier 7, which simplifies mechanical handling of the contact element 1

Formed on the socket portion 2 is a resilient lamella 8, which simplifies attachment to the contact element 1 of an outer body or overspring 9 housing the socket portion 2 and may at the same time be used to increase retention forces acting on a plug- in contact (not shown here) inserted into the socket portion 2 Fig 2 is a side view of a contact element 1 according to the invention with outer body 9 fitted thereto The outer body 9 grips loosely around the contact element 1 with clamps 10, 10' and is fastened to the contact element 1 by means of the clamp 10" In order to simplify fastening of the outer body 9 to the contact element 1, clamp recesses 1 1 are formed on the contact element 1, by means of which the clamp 10" may more readily

grip around the contact element 1 without slipping in a longitudinal direction L of the contact element 1.

In addition, the outer body 9 has positioning assistances or aids 12, which simplify correct insertion and locking of the contact element 1 in a connector (not shown) and at the same time protect from damage wherein a latching spring or latching arm 13 serves to fasten the contact element 1 in a connector (not shown). The free end 13' of the latching spring 13 is mobile transversely of the longitudinal direction L and serves to latch the contact element 1 in a connector, in that it engages behind a catch projection arranged thereon. In addition, the side view in Fig. 2 of the contact element 1 according to the invention makes clear the arrangement of the neck 3, of the conductor crimp section 6, of the insulation crimp section 6' and of the carrier 7, which are connected together substantially rigidly.

Fig. 3 is a schematic front view of a contact element 1 according to the invention together with outer body 9 fitted thereto. Here it is clear how the clamps 10, 10' of the outer body 9 grip around an edge 14 of an contact opening 15 for receiving a plug-in contact (not shown here) in the socket portion 2. The clamps 10, 10' thus protect the edge 14 on insertion of the plug-in contact (not shown here) and simplify insertion.

It is additionally clear that the latching spring 13 has been divided in two in a longitudinal direction L of the contact element 1 and the positioning assistance 12 is arranged centrally between the latching springs 13.

Fig. 4 is a perspective view of two contact elements 1 according to the invention, one with and one without outer body 9, and the separate outer body 9.

It is made clear by the contact element 1 shown in Fig. 4 how the latter is subdivided into the socket portion 2, a weakened or straining or stretching zone 16, a contact retention section 17 and a conductor terminal 4 connected rigidly to the contact retention section 17 via the neck 3. In the contact retention section 17, the clamp recesses 11 and retaining points 18 are formed, which serve to fasten the contact element 1 in its mounting environment or to couple rigidly to the contact element 1 the outer body 9 serving to mount the contact element 1. It is however essential to prevent vibrations introduced into the contact retention section 17 via the neck 3 and the retaining points 18 and clamp recesses 11 from being relayed to the socket portion 2, since this could lead to damage or incorrect contacting of a plug-in contact (not shown here) inserted into the socket portion 2.

In order to prevent or reduce the transmission of oscillations or vibrations between the contact retention section 17 and the socket portion 2, notches 20, 20' are introduced into the body 19 of the contact element 1 to provide the straining zone 16. The material of the body 19 left in the area of the notches 20, 20' serves as an flex point or material bridge forming an articulated connection.

Since the notches 20, 20' are introduced into the body 19 of the contact element 1 in the vertical direction H in each case from above and below, when viewed in the lateral direction S a serpentine profile or a deflection is obtained in the portions of the contact element 1 holding the socket portion 2 in the damping zone 16. Since the body 19 is also slightly recessed or weakened in the lateral direction S in the area of the notches 20, 20', greater resilience is present in the area of the straining zone 16 in all three spatial directions, i.e. in the longitudinal direction L, in the vertical direction H and in the lateral direction S, than in the other areas of the body 19.

It is additionally clear from Fig. 4 that the socket portion 2 of the body 19 of the contact element 1 has an auxiliary contact spring 22 at the side, which like the resilient lamella 8 projects into the inside of the socket portion 2, in order there to retain the plug- in contact (not shown here). Fig. 4 also shows how the outer body 9 grips with its clamps 10, 10', 10" around the edge 14 of the contact opening 15 and the clamp recesses 11 on the contact element 1.

Fig. 5 is a plan view of a contact element 1 according to the invention with outer body 9 positioned thereon. The longitudinal section taken along section line A - A through a contact element 1 according to the invention is described hereinafter with reference to Fig. 6.

The inside of the body 19 shown in longitudinal section contains a main contact spring 23 arranged in the socket portion 2, which main contact spring 23 projects into a contact receiving area 19' for a plug-in contact (not shown here). The main contact spring 23 is fastened in the area of its root 24 to the body 19 in the socket portion 2 and projects with its free end in the longitudinal direction L as far as into the straining zone 16.

Opposite the main contact spring 23 in the contact receiving area 19', the base 26 of the contact element 1 is bent in a contacting area 27 towards the main contact spring 23 so as to project into the contact receiving area 19'. A plug-in contact (not shown here) may thus be retained in the socket portion 2 in the contacting area 27 between the base 26, the main contact spring 23 and the auxiliary contact spring 22. The part of the body 19 connected to the root 24 of the main contact spring 23 is provided with a notch 20", whereby the main contact spring 23 is fastened flexibly in the lateral direction S to the body 19.

As best shown in Fig. 4, the socket portion 2 is decoupled from the contact retention section 17 with regard to vibrations by the straining zone 16 formed in the body

19 by the notches 20 and 20'. To prevent vibrations from the contact retention section 17 being introduced along the outer body 9 fitted thereto via the edges 14 of the contact opening 15 into the socket portion 2, the clamps 10, 10' of the outer body 9 are not firmly connected to the edge 14, but rather merely loosely grip around the edge 14. ^< Fig. 7 is a cross-section of a contact element 1 according to the invention along section line C - C in Fig. 6. This figure makes it clear how the main contact spring 23 and the contacting area 27 of the base 26 face one another in the vertical direction H in a second contact zone 29, so as to retain a plug-in contact (not shown here) between them.

Fig. 8 is a cross-sectional view of a contact element 1 according to the invention, along section line B - B in Fig. 6. This figure makes it clear how in the vertical direction H the main contact spring 23 and the contacting area 27 of the base 26 and in the lateral direction S the auxiliary contact springs 22 face a second contact zone 29 located behind the first contact zone 28 in the longitudinal direction L, so as to retain between them a plug-in contact (not shown here). Fig. 9 is a longitudinal sectional view of a contact element 1 according to the invention in an initial position. The plug-in contact 30 shown here is ready to be inserted into the contact opening 15 in the contact element 1 in an insertion direction E parallel to the longitudinal direction L. To hold the plug-in contact 30 firm, the main contact spring 23 has contact points 31, 31 ', bent towards the base 26, i.e. in the main spring direction F, in the area of the first contact zone 28 or the second contact zone 29. Between the contact points 31, 31 ' the main contact spring 23 has a top support 32, in which it is bent towards the resilient lamella 8. Near the free end 25 of the main contact spring 23, it is bent towards the top of the contact element 1 in such a way that its support area 33 rests against a top support 32.

In addition, the main contact spring 23 rests at the contact point 31' on the auxiliary contact spring 22 functioning as a limit stop and displays pretensioning in the direction of the base 26, i.e. in the direction of main spring deflection F.

Fig. 10 is a cross-section of a contact element 1 according to the invention taken along section line M - M in Fig. 9. This cross-section is thus disposed in the second contact zone 29 and makes it clear that the main contact spring 23 rests on the auxiliary contact springs 22. The auxiliary contact springs 22 rest on shoulders 34 on the main contact spring 23 and cannot therefore get any closer together. In this way, the shoulders 34 act as limit stops in the auxiliary spring path N of the auxiliary contact springs 22, whereby the auxiliary contact springs 22 are also under pretension.

Fig. 11 shows a longitudinal section through a contact element 1 according to the invention, into which a plug-in contact 30 has been inserted in the longitudinal direction L as far as the first contact zone 28. This figure makes it clear how the plug-in contact 30 is clamped between the first contact point 31 on the main contact spring 23 and the contacting area 27 of the base 26. This causes the main contact spring 23 to deform, such that it is pressed in the area of the bearing 33 against the resilient lamella 8 at the top support 32 of the contact element 1. Thus the resistance provided by the main contact spring 23 against displacement by the plug-in contact 30 is increased and the clamping and contacting forces provided by the main contact spring 23 and acting on the plug-in contact 30 are increased.

Fig. 12 shows a schematic cross-sectional view of a contact element 1 according to the invention, in the area of section line M - M in Fig. 11. This figure makes it clear how, in the illustrated second contact zone 29 the main contact spring 23 is lifted away from the auxiliary contact springs 22 when the plug-in contact 30 is half-inserted and the

shoulders 34 on the main contact spring 23 thus release the auxiliary contact springs 22. The auxiliary contact springs 22 may then clamp the plug-in contact 30 between them in the lateral direction S along the auxiliary spring path N.

Fig. 13 is a longitudinal sectional view of a contact element 1 according to the invention with a plug-in contact 30 fully inserted in an inserted position B. The plug-in contact 30 is here retained in the first contact zone 28 and the second contact zone 29 by the main contact spring 23 by means of the contact points 31, 31 ' thereof. Both the support area 33 and the support area 33' rest against the top 32 of the contact element 1 or the resilient lamella 8 and thus assist the main contact spring 23 in retaining the plug-in contact 30. At the same time, the main contact spring 23 is decoupled from the body 19 with regard to vibration via the notch 20" in the area of its root 24. The socket portion 2 and thus the body 19 itself are decoupled from the contact retention section 17 with regard to vibration by the notches 20 and 20' and the resultant flex points 21 and 21 '.

By means of the vibration decoupling of the elements of the contact element 1 retaining the plug-in contact 30 in the area of the socket portion 2, it is ensured that the retention or contact forces acting on the plug-in contact 30 are always greater than vibration forces introduced into the socket portion 2.

Fig. 14 is a cross-sectional view of a contact element 1 according to the invention taken along section line M - M in Fig. 13. This figure makes it clear that, when the plug- in contact 30 is fully inserted, or in the inserted position B, the main contact spring 23 and the base 26 of the contact element 1 and the auxiliary contact springs 22 retain the plug-in contact 30. Thus, the plug-in contact 30 is fixed both in the lateral direction S and in the vertical direction H.

If the plug-in contact 30 is removed again from the contact element 1, i.e. from the situation illustrated in Figs. 13 and 14, the main contact spring 23 and the auxiliary contact springs 22 effect a movement sequence which is the reverse of the insertion process. Thus, when the plug-in contact 30 is withdrawn from the contact element 1, first of all the main contact spring 23 drops and the auxiliary contact springs 22 then rest against the shoulders 34 of the main contact spring 23.

Modification of the above-described embodiments are possible within the concept of the invention. The use of auxiliary contact springs 22 in addition to a main contact spring 23 is wholly optional. Pretensioning of the auxiliary and main contact springs 22, 23 is also not mandatory. Pretensioning increases the clamping forces, so improving retention of the plug-in contact 30 in the contact element 1.

Both the main contact spring 23 and the auxiliary contact spring 22 may be supported with the assistance of a support area 33 against the contact element 1 or against a resilient lamella 8 formed on the contact element 1. Separate shoulders 34 may also be formed in the contact element 1 for an auxiliary contact spring 22, so defining the auxiliary spring path N of the auxiliary contact spring 22. As on the main contact spring 23, a plurality of contact points 31, 31' may also be formed on the auxiliary contact spring 22 in any desired embodiment.

Fitting of an outer body 9 on the contact element 1 is optional. Latching springs 13 or positioning assistances 12 formed on the outer body 9 may likewise be formed on the contact element body 19 itself. Use of an outer body 9 simplifies decoupling with regard to vibration of contact retention section 17 serving in fastening the contact element 1.

To decouple the contact retention section 17 or a conductor terminal 4 with regard to vibration from the socket portion 2, structural elements other than the notches 20 illustrated here may also be selected. When providing isolation zones 16 and flex points 21 care should mainly be taken to ensure that these fulfil the stability requirements of a contact element 1 according to the invention despite their resilience and that, in constructing them, the current-carrying cross-sections of the contact element 1 are always sufficiently large for them not to constitute conduction bottlenecks or elevated conduction resistances.