EP3047544B1 - Contact washer and plug connector - Google Patents

Description

The invention relates to a contact spring ring. Furthermore, the invention relates to a connector.

Connectors, which are used in particular in wind turbines, have the requirement to have the best possible shielding in order to be able to dissipate particularly overvoltages, which may be caused by lightning, for example, well. For this purpose, the shielding of the cable, for example in the form of a shielding braid, which surrounds the wires of the cable and is arranged below the jacket of the cable, must be contacted. This is usually possible only with great effort. For example, it is known to strip the free end of the cable, to disentangle the underlying braid, fold over and lay it over the jacket of the cable. For contacting a metal sleeve is then guided over the folded shield braid and screwed or crimped to the braid, so that the braided shield is clamped between the metal sleeve and the jacket of the cable. This method is often used in coaxial connectors or molded connectors, such as in the EP 0 207 322 B1 is described.

In the case of connectors which can be assembled freely, the procedure is either similar or else the contacting is produced via a resilient element, such as a contact spring ring, which can be actuated, for example, via a housing. The continuation of the shielding is then usually realized via a screw, which with a corresponding fitting part of a mating connector corresponds. An example of a contact spring ring is in the DE544104 described. It is known to use a spiral spring ring as a contact spring ring, which, however, is expensive to manufacture, whereby high manufacturing costs for the contact spring ring and thus also the connector, in which one or more of these contact spring rings are arranged, may arise. In addition, a spiral spring ring can have disadvantages during expansion and tensioning of the spiral spring ring.

The invention is based on the object to provide a contact spring ring and a connector available, by means of which the aforementioned disadvantages can be solved.

The object of the invention is achieved with the features of the independent claims. Advantageous embodiments and advantageous developments of the invention are specified in the dependent claims.

The contact spring ring according to the invention has a plurality of annularly arranged U-shaped regions, each having two substantially mutually parallel webs, wherein the webs of a U-shaped region formed at a radially outer end of the webs via a first connecting web are interconnected, wherein adjacent to each other arranged U-shaped regions are connected to one another at a radially inner end of their webs via a second connecting web, and wherein the U-shaped regions in the region of their Substantially mutually parallel webs have at least one bend, and wherein a U-shaped region is connected to an adjacently arranged U-shaped region via a third connecting web to form a further contact point radially outward of the contact spring ring. The contact spring ring according to the invention is formed with respect to an otherwise commonly used spiral spring ring of a plurality of annularly arranged U-shaped regions, each adjacently arranged U-shaped regions are interconnected. The connection of the U-shaped areas with each other takes place radially inwardly of the contact spring ring, wherein radially inward the region of the contact spring ring, with which the contact spring ring in the mounted state on the outer surface of the article on which it is mounted, for example a cable, rests. Due to the U-shaped regions, which are open in the direction radially inward, and by the connection of the adjacently arranged U-shaped regions via second connecting webs radially inwardly, the contact spring ring has a meandering shape. However, the contact spring ring is not flat or planar, but the U-shaped areas have in the region of their substantially mutually parallel webs a bend, wherein the bend extends annularly over the entire contact spring ring and thus each web all U-shaped trained areas has this bend. The bend can have a bending radius between 30 ° and 120 °. The bend is configured such that the first connecting webs, which are arranged radially on the outside and are part of the U-shaped regions, in the direction of the second connecting webs, which are arranged radially inward and connect the U-shaped regions with each other, are bent. At the first connecting webs and thus radially outwardly of the U-shaped areas of the contact spring ring is designed to be free springy. If the contact spring ring has only one bend in the region of the U-shaped regions, the contact spring ring is preferably also designed to be spring-free in the region of the radially inner second connecting webs. The contact spring ring can be radially clamped by its special design, but also be widened radially, so that the contact spring ring can apply a radial spring action. In this way, the contact spring ring, which can be axially slid onto the object to be mounted, such as a cable, different diameters, for example, different diameters in a cable sheath or a shield, compensate. Furthermore, the contact spring ring is characterized by a comparison with a spiral spring ring cost-effective production, since the production cost compared to a spiral spring ring is reduced due to the lack of winding.

It is preferably provided that the U-shaped regions have a first bend and a second bend in the region of their webs arranged substantially parallel to one another. Due to the formation of two bends on the two webs per U-shaped region of the contact spring ring can be axially expanded and axially braced in addition to the radial expansion and radial tension, so that the contact spring ring can apply in addition to the radial spring action and an axial spring action , Assign the U-shaped areas along their length and thus between their radially inner end and their radially outward end in each case two bends, the contact spring ring radially inward, in the region of the second connecting webs, which each connect two adjacently arranged U-shaped areas with each other, be set, so that the contact spring ring radially inside has no spring action.

If the U-shaped regions each have two bends, it is preferably provided that the first bend and the second bend have differently sized bending radii. Due to the different sized bending radii, the spring action of the contact spring ring can be improved and also be customized.

It is preferably provided that the second bend is formed closer to the radially inner second connecting web than the first bend, wherein the bending radius of the second bend is preferably smaller than the bending radius of the first bend. By the closer radially inward second bend can be achieved that in the region of the second connecting webs and the radially inner ends of the U-shaped areas of the contact spring ring possible flat against the object to which it is mounted, may rest, to an axial To achieve fixing. Due to the further radially outer first bend, which preferably has a larger bending radius than the second bend, the axial and radial spring action of the contact spring ring can be achieved. For example, the first bend may have a bend radius between 80 ° and 120 °, preferably between 90 ° and 110 °, and the second bend may be for example one Bending radius between 30 ° and 60 °, preferably between 40 ° and 50 °, more preferably of 45 °.

In order to increase the contact points of the contact spring ring in the mounted state, it may preferably be provided that a U-shaped region is connected to an adjacently arranged U-shaped region via a third connecting web to form a further contact point radially outside of the contact spring ring. In this embodiment, the U-shaped areas can thus be at least partially also radially outward in addition to the connection radially inwardly to be able to form a further contact point radially outward of the contact spring ring.

The third connecting web is preferably V-shaped. The V-shaped third connecting web is preferably formed with its two free ends in one piece with the adjacently arranged U-shaped regions. The angled between the two ends of the third connecting web, which forms the V-shape, is formed radially outwardly of the contact spring ring, said angled portion radially outwardly preferably flush with the U-shaped areas, in particular the first connecting web of the U-shaped areas, to lock. The V-shaped connecting web is aligned or arranged such that the V-shaped connecting web is open in the radially inward direction.

To achieve a particularly cost-effective production of the contact spring ring of a disc-shaped Metal element may be formed, wherein the substantially mutually parallel webs and the first, second and third connecting webs may be formed by a laser, punching or etching of the disc-shaped metal member. The disc-shaped metal element may be formed from a sheet metal material, in particular a spring steel, and have the form of a washer. By means of lasers, punching or etching can be introduced in a short time, with little effort, the inner contour and outer contour of the disk-shaped metal element interrupting slots in the disk-shaped metal element, which can be formed by the slots, the webs and connecting webs to form the contact spring ring. After forming the webs and connecting webs by lasering, stamping or etching, the contact spring ring can be bent once or twice in the area of the webs in order to introduce the bends into the contact spring ring.

A contact spring ring of the above-mentioned and further developed type can be arranged in a plug connector, with one or also two or more of the correspondingly formed contact spring rings being able to be arranged in a plug connector.

The connector may include an insulating housing within which a free end of a cable is inserted, a plurality of contact elements connected to the wires of the cable, and a shield sleeve, the contact spring ring being attached to a first stripped portion of the free end of the cable on which the wires the cable surrounding the shield, wherein in the longitudinal extension of the cable before and behind the Contact spring ring, the cable is surrounded by a jacket of the cable, wherein the contact spring ring is enclosed by the shield sleeve, and wherein the shield sleeve is fixed to the jacket of the cable in front of and behind the contact spring ring.

The connector is characterized inter alia by the fact that the manufacturing cost compared to conventional connectors is substantially reduced and now the entire manufacturing process can be done automatically in different workstations, whereby the production, especially large quantities, can be done very economically.

In the manufacture of the connector according to the invention, first, the jacket of the cable to be inserted into the connector is cut at two areas, wherein at the first area as far as a cut is made that only the jacket is cut, but not the underlying shielding. At the second area, which is spaced from the first area, the shield is also cut in addition to the jacket. Between the first region and the second region, the jacket and the shield remain on the cable. At the first area so much is removed from the jacket, that in the first region of the contact spring ring can be used, which rests in the inserted state on the shield of the cable. Before and behind the inserted contact spring ring, the cable is still surrounded by the jacket of the cable. By cutting the sheath and the shield in the second region, the sheath and the shielding can be pulled off the cable so that an end portion of the free end of the sheath is removed Cable is formed, on which the wires of the cable are exposed. If necessary, the now exposed wires can also be stripped and connected with contact elements, for example by crimping. Subsequently, an electrically conductive shielding sleeve, which may be made for example of a metal diecasting, so far passed over the free end of the cable that the contact elements and the contact spring ring are completely covered by the shielding sleeve. For safe positioning of the shielding sleeve shielding sleeve is attached to the jacket of the cable immediately before and behind the contact spring ring. The attachment of the shielding sleeve on the jacket of the cable takes place in such a way that both the contact spring ring is thereby sealed tight, and a strain relief for the cable is formed. An insulating housing is then pushed over the shielding sleeve, which covers the shielding sleeve and the free end of the cable except for a small area, wherein the insulating housing bears in regions on the outer circumferential surface of the shielding sleeve. Each processing step during the manufacturing process, and also for the production of the contact spring ring, in this case can be fully automated, so that no more manual work must be used, which in addition to the manufacturing cost and the production costs and the production time can be reduced.

Preferably, it is provided that the contact spring ring is tensioned by the shielding sleeve. This is achieved in that when mounting the shielding sleeve on the jacket, preferably by a crimping process, the shielding sleeve is reduced in diameter in the region of the first contact spring ring and thus in the direction of the Mantels is pressed, whereby the shield sleeve presses on the contact spring ring and this biases, so that the contact spring ring is stretched radially in the assembled connector through the shield sleeve.

Further, it is preferably provided that at a free end of the shielding sleeve, to which the connector is fastened by means of the shielding sleeve to a wall, a second electrically conductive contact spring ring is inserted into a formed on the shielding sleeve recess. The second contact spring ring, which is as outlined and further developed, is in a fixed state of the connector with the wall, which is for example a housing wall, flat against the wall, wherein in a metal wall formed of the second contact spring ring serves as a shield, so that a Schirmkontaktierung between the wall and the second contact spring ring can be formed. In addition, the second contact spring ring can compensate for a game formed between the connector and the wall game.

The invention will be explained in more detail with reference to the accompanying drawings with reference to preferred embodiments.

Fig. 1

eine schematische Darstellung eines Steckverbinders gemäß der Erfindung in einer Schnittansicht,

Fig. 2

eine schematische Darstellung eines Kontaktfederrings in einer perspektivischen Ansicht,

Fig. 3

eine schematische Darstellung des in Fig. 2 gezeigten Kontaktfederrings in einer Draufsicht von vorne,

Fig. 4

eine schematische Darstellung eines Kontaktfederringes in einer perspektivischen Ansicht,

Fig. 5

eine schematische Darstellung des in Fig. 4 gezeigten Kontaktfederrings in einer Draufsicht von vorne,

Fig. 6

eine schematische Darstellung einer Anordnung des in Fig. 2 und 3 gezeigten Kontaktfederrings auf einem Kabel,

Fig. 7

eine schematische Detaildarstellung einer Anordnung des in Fig. 4 und 5 gezeigten Kontaktfederrings in einem wie in Fig. 1 gezeigten Steckverbinder, und

Fig. 8

eine schematische eines Kontaktfederringes gemäß der Erfindung in einer perspektivischen Ansicht.

Show it

Fig. 1

a schematic representation of a connector according to the invention in a sectional view,

Fig. 2

a schematic representation of a contact spring ring in a perspective view,

Fig. 3

a schematic representation of the in Fig. 2 shown contact spring ring in a plan view from the front,

Fig. 4

a schematic representation of a contact spring ring in a perspective view,

Fig. 5

a schematic representation of the in Fig. 4 shown contact spring ring in a plan view from the front,

Fig. 6

a schematic representation of an arrangement of in Fig. 2 and 3 shown contact spring ring on a cable,

Fig. 7

a schematic detail of an arrangement of in Fig. 4 and 5 shown contact spring ring in a as in Fig. 1 shown connectors, and

Fig. 8

a schematic of a contact spring ring according to the invention in a perspective view.

In Fig. 1 a connector according to the invention is shown in a sectional view. The connector has an insulating housing 1, which is formed substantially sleeve-shaped and the outer shell of the Connector forms. Within the insulating housing 1, a free end 2 of a cable 3 is inserted.

The cable 3 has at the free end 2 a first stripped area 4, on which the jacket 5 of the cable 3 is removed and the arranged below the shell 5 shielding 6, which is designed as a screen braid, the cable 3 is exposed. In this first stripped area 4, a first electrically conductive contact spring ring 7 'is arranged on the shield 6. The first contact spring ring 7 'is shaped in the form of a closed ring, which bears tightly against the shield 6.

At one end portion 8 of the free end 2 of the cable 3, several wires 9 of the cable 3 emerge from the cable 3 and are connected to contact elements, not visible here, the contact elements are in turn arranged in an insulating body 11. The insulating body 11 is spaced within the connector of the end portion 8 of the free end 2 of the cable 3 is arranged.

Between the insulating body 11 and the insulating housing 1, an electrically conductive shielding sleeve 12 is arranged, which encloses the insulating body 11, a second between the insulating body 11 and the end portion 8 of the free end 2 of the cable 3 formed free space 13 and the first contact spring ring 7 '. The shielding sleeve 12 projects beyond the contact spring ring 7 'both in front of and behind the contact spring ring 7' and is sealingly arranged on the jacket 5 of the cable 3. In the region of the first contact spring ring 7 'is the shield sleeve 12 on the contact spring ring 7' and pushes it in the direction of Shielding 6, so that the contact spring ring 7 'is stretched radially through the shield sleeve 12.

In the region of the insulating body 11 and the second free space 13, the shielding sleeve 12 is formed thicker than in the region of the first contact spring ring 7 ', so that in the region of the insulating body 11 and the second free space 13, the shielding sleeve 12 rests against the inner wall 14 of the insulating housing 1. In an arranged between the insulating housing 1 and arranged in the insulating housing 1 free end 2 of the cable 3 first free space 15, an insulating material 28 is injected, which completely fills the first space 15. The insulating material 28 is adjacent in the region of the free end 2 of the cable 2 to an outer peripheral surface of the shielding sleeve 12 and, where no shielding sleeve 12 is provided, directly to the jacket 5 of the cable 3.

In the shielding sleeve 12, one or more, not shown, openings are further formed, via which the injected into the first free space 15 insulating material 28 in the second free space 13, which is an interior of the shielding sleeve 12, in which the exposed wires. 9 of the cable 3 are inserted into the insulating body 12, can flow, so that even this the inner space of the shield sleeve 12 forming second space 13 preferably no longer filled with air areas, but is completely filled with the insulating material 28. The guided in the second free space 13 wires 9 of the cable 3 are thus embedded in the insulating material 28.

In the first region 4 is between the shield 6, the first contact spring ring 7 'and the shield sleeve 12 a third free space 33 is formed, which is not filled by the insulating material, but in which air is arranged so that the first contact spring ring 7 'tension and relax.

The shielding sleeve 12 is substantially completely enclosed by the insulating housing 1 except for a region of a free end 16 of the shielding sleeve 12. At the region of the free end 16, which is not covered by the insulating housing 1, the shield sleeve 12 has latching means 17 for attaching the connector to a wall. The latching means 17 are provided in the form of a plurality of ring-shaped on the end face of the shielding sleeve 12 locking hooks.

The insulating housing 1 is movably mounted on the screen sleeve 12 and also on the arranged in the first space 15 insulating material 28, so that the insulating housing 1 can be moved to the shield sleeve 12 and the insulating material 28, wherein at a sliding movement of the insulating housing 12, the locking means 17th can be operated. For this purpose, a bulge 19 is formed on the outer peripheral surface of the shielding sleeve 12 in the vicinity of the locking means 17. On the inner wall 14 of the insulating housing 1 an inclined stop surface 20 is provided. If the insulating housing 1 is pushed with the abutment surface 20 on the bulge 19, the shield sleeve 12 is pressed at its free end 16 and thus also the locking means 17 inside, so that a hooking of the locking means 17 can be solved with the wall.

Further, at the free end 16 of the shield sleeve 12, a second electrically conductive contact spring ring 7 "in shape a closed ring in a formed on the shield sleeve 12 recess 22 used. The second contact spring ring 7 "is arranged close to the latching means 17, so that when a catching of the latching means 17 behind the wall of the second contact spring ring 7" a spring force on the locking means 17 such that the latching means 17 are pressed to the outside, so that a particularly stable and secure entanglement or attachment of the locking means 17 and thus the connector is made possible on the wall.

Fig. 2 shows a first possible embodiment of a contact spring ring 7 '. The contact spring ring 7 'has a plurality of annularly arranged U-shaped regions 10'. The U-shaped regions 10 'each have two substantially mutually parallel webs 18a', 18b 'and a first connecting web 21', which is formed substantially at a right angle to the webs 18a ', 18b' and with the radially outer ends of the webs 18a ', 18b' is integrally connected, on. The individual U-shaped regions 10 'are integrally connected to the respective adjacently arranged U-shaped regions 10' via a second connecting web 23 ', which is arranged radially inward of the contact spring ring 7'. The contact spring ring 7 'is thus closed annular and has a meandering shape.

The U-shaped regions 10 'have in the region of their webs 18a', 18b 'each have a bend 24', through which the webs 18a ', 18b' over their length from radially inward to radially outwardly also substantially U-shaped are formed bent. Due to the bend 24 ', the first connecting web 21' is bent in the direction of the second connecting web 23 ', so that the connecting webs 21', 23 'are substantially opposite one another and directed towards one another. The bend 24 'preferably has a bending radius between 40 ° and 80 °.

At the first connecting webs 21 'and thus radially outwardly of the U-shaped regions 10' of the contact spring ring 7 'is formed freely resiliently. Further, the contact spring ring 7 'is also radially inwardly formed on the second connecting webs 23' free spring. The contact spring ring 7 'can be radially clamped by its special design, but also be widened radially, so that the contact spring ring 7' can apply a radial spring action.

Fig. 3 shows the in Fig. 2 shown contact spring ring 7 'in a plan view from the front.

In Fig. 4 and 5 A second possible embodiment of a contact spring ring 7 "is shown, and the contact spring ring 7" also has a multiplicity of annularly arranged U-shaped regions 10 ", which each have two webs 18a", 18b "arranged essentially parallel to one another 18a ", 18b" of a U-shaped region 10 "are radially connected to each other via a first connecting web 21". Adjacent U-shaped regions 10 "are at their webs 18a", 18b "radially inward via a second connecting web 23 "connected.

In contrast to that in the Fig. 2 and 3 shown contact spring ring 7 'has in the Fig. 4 and 5 shown contact spring ring 7 "in the U-shaped regions 10" along the webs 18a ", 18b" in each case two bends 24a ", 24b" on. A first bend 24a "is further radially outwardly formed than a second bend 24b". The two bends 24a ", 24b" have different sized bending radii, wherein the first bend 24a "has a larger bending radius than the second bend 24b". For example, the first bend 24a "may have a bend radius between 80 ° and 120 °, preferably between 90 ° and 110 °, and the second bend 24b" may have a bend radius between 30 ° and 60 °, preferably between 40 ° and 50 °, for example. particularly preferably 45 °. By the two bends 24a ", 24b" along the webs 18a ", 18b" of the U-shaped regions 10 ", the contact spring ring 7" in addition to the radial spring action also apply an axial spring action, so that the contact spring ring 7 "radially and axially can be achieved that in the region of the second connecting webs 23 "and the radially inner ends of the U-shaped regions 10" of the contact spring ring 7 "in the arrangement in In order to achieve an axial fixing, a connector can lie as flatly as possible against the shielding sleeve 12 in the recess 22. The radially outermost first bend 24a ", which has a larger bending radius than the second bend 24b", can accommodate the axial and radial Spring action of the contact spring ring 7 "can be achieved.

Fig. 5 shows the in Fig. 4 shown contact spring ring 7 "in a plan view from the front.

Fig. 6 shows a detailed representation of the in the Fig. 1 shown connector in the area where a contact spring ring 7 ', which according to the in the Fig. 2 and 3 shown contact spring ring 7 'is formed in the first stripped area 4 is arranged on the shield 6. The contact spring ring 7 'is radially inwardly with the second connecting webs 23' on the shield 6 on.

Fig. 7 shows a detailed representation of the in the Fig. 1 shown connector in the area where a contact spring ring 7 ", which according to the in the Fig. 4 and 5 shown contact spring ring 7 "is formed in a formed on the shield sleeve 12 recess 22 is inserted.

In the embodiments shown here, the contact spring ring 7 ', which has only one bend 24', arranged on the shield 6 of the stripped cable 3 and the contact spring ring 7 ", which has two bends 24a", 24b "is in the recess 22 of However, it is also possible conversely that the contact spring ring 7 ', which has only one bend 24', is arranged in the recess 22 of the shield sleeve 12, and that the contact spring ring 7 ", which has two bends 24a", 24b " has, is arranged on the shield 6 of the stripped cable 3. Further, it is also possible that the contact spring ring 7 ', which has only one bend 24', both on the shield 6 of the stripped cable 3 and in the recess 22 of Umbrella sleeve 12 may be arranged. Alternatively, it is also possible for the contact spring ring 7 ", which has two bends 24a", 24b ", to be arranged both on the shielding 6 of the stripped cable 3 and in the recess 22 of the shielding sleeve 12.

Fig. 8 shows a further possible embodiment of a contact spring ring 7 ", wherein the contact spring ring 7 '" can be arranged for example on the shield 6 of the stripped cable 3 or, for example, in the recess 22 of the shield sleeve 12.

The in Fig. 8 shown contact spring ring 7 '"is similar to the in Fig. 2 shown contact spring ring 7 ', wherein in the in Fig. 8 In addition, a third connecting web 29 is formed between two U-shaped regions 10 '"of the contact spring ring 7'". The third connecting web 29 is substantially V-shaped and is formed with its two free ends integral with two adjacently arranged U-shaped regions 10 '", in particular the webs 18a"', 18b '"of the U-shaped regions 10'" , connected. The third connecting web 29 is integrally connected with its free ends in a region of the webs 18a "', 18b'" between the bend 24 '"and the first connecting web 21'" of a U-shaped region 10 '". which is arranged in a gap between two U-shaped regions 10 '", has a small web width than the webs 18a"', 18b '"and the first connecting web 21'" of the U-shaped regions 10 ''. The V-shaped third connecting web 29 is designed to be open in the radially inward direction, so that a closed end 30 of the third Connecting web 29 is directed radially outward. With its closed end 30, where the third connecting web 29 has a bend, the third connecting web 29 can form an additional contact point radially outward of the contact spring ring 7 '. "The closed end 30 of the third connecting web 29 is flush with the one shown here first connecting web 21 "'of the U-shaped portions 10"' from. LIST OF REFERENCE NUMBERS insulating 1 Free end 2 electric wire 3 First area 4 coat 5 shielding 6 Contact spring ring 7 ', 7 ", 7'" end 8th Vein 9 U-shaped area 10 ', 10 ", 10'" insulator 11 screen sleeve 12 Second free space 13 inner wall 14 First free space 15 Free end 16 latching means 17 web 18a ', 18a ", 18a'", 18b ', 18b ", 18b'" bulge 19 stop surface 20 First connecting bridge 21 ', 21 ", 21'" recess 22 Second connecting bridge 23 ', 23 ", 23'" bend 24 ', 24a ", 24b", 24'" insulating material 28 Third connecting bridge 29 Closed end 30 Third free space 33

Claims (10)

1. Contact spring ring (7', 7", 7"') comprising a large number of U-shaped regions (10', 10" , 10"') which are arranged in a ring and which each have two webs (18a', 18a", 18a'", 18b', 18b", 18b"') which are arranged substantially parallel in relation to one another, wherein the webs (18a', 18a", 18a'", 18b', 18b" , 18b'") of a U-shaped region (10', 10" , 10"') are connected to one another by means of a first connecting web (21', 21" , 21"') at a radially outer end of the webs (18a', 18a", 18a'", 18b', 18b" , 18b'"),
   wherein U-shaped regions (10', 10" , 10"') which are arranged adjacent to one another are connected to one another by means of a second connecting web (23', 23", 23"') at a radially inner end of their webs (18a', 18a", 18a"', 18b', 18b" , 18b'"), and wherein the U-shaped regions (10', 10", 10"') have at least one bend (24', 24a" , 24b", 24"') in the region of their webs (18a', 18a", 18a"', 18b', 18b", 18b"') which are arranged substantially parallel in relation to one another,
   characterized in that a U-shaped region (10', 10", 10"') is connected to an adjacent U-shaped region (10', 10", 10"') by means of a third connecting web (29) for forming a further contact point radially outside the contact spring ring (7', 7", 7"').
2. Contact spring ring (7', 7", 7"') according to Claim 1, characterized in that the U-shaped regions (10', 10", 10"') have a first bend (24', 24a", 24b", 24"') and a second bend (24', 24a", 24b", 24"') in the region of their webs (18a', 18a", 18a"', 18b', 18b", 18b"') which are arranged substantially parallel in relation to one another.
3. Contact spring ring (7', 7" , 7"') according to Claim 2, characterized in that the first bend (24', 24a", 24b", 24"') and the second bend (24', 24a", 24b", 24"') have bending radii of different magnitudes.
4. Contact spring ring (7', 7", 7"') according to Claim 2 or 3, characterized in that the second bend (24', 24a", 24b", 24"') is formed closer to the radially inner second connecting web (23', 23", 23"') than the first bend (24', 24a", 24b", 24"'), wherein the bending radius of the second bend (24', 24a", 24b", 24"') is smaller than the bending radius of the first bend (24', 24a", 24b", 24"').
5. Contact spring ring (7', 7", 7"') according to one of Claims 1 to 4, characterized in that the third connecting web (29) is V-shaped.
6. Contact spring ring (7', 7", 7"') according to one of Claims 1 to 5, characterized in that the contact spring ring (7', 7", 7"') is formed from a disc-like metal element, wherein the webs (18a', 18a", 18a'", 18b', 18b" , 18b'") and connecting webs (21', 21", 21"', 23', 23", 23"', 29) are formed by lasering, punching or etching the disc-like metal element.
7. Plug connector comprising at least one contact spring ring (7', 7", 7"') which is formed according to one of Claims 1 to 6.
8. Plug connector according to Claim 7, characterized in that the plug connector has an insulating housing (1) within which a free end (2) of a cable (3) is inserted, a plurality of contact elements which are connected to the cores (9) of the cable (3), and a shielding sleeve (12), wherein the contact spring ring (7', 7", 7"') is arranged on the shield (7), which surrounds the cores (9) of the cable (3), at a first unsheathed region (4) of the free end (2) of the cable (3), wherein the cable (3) is surrounded by a sheath (5) of the cable (3) in front of and behind the contact spring ring (7', 7", 7"'), wherein the contact spring ring (7', 7", 7'") is enclosed by the shielding sleeve (12), wherein the shielding sleeve (12) is fastened to the sheath (5) of the cable (3) in front of and behind the contact spring ring (7' , 7", 7"').
9. Plug connector according to Claim 8, characterized in that the contact spring ring (7', 7", 7"') is tensioned by the shielding sleeve (12).
10. Plug connector according to Claim 8 or 9, characterized in that a second electrically conductive contact spring ring (7', 7") is inserted into a recess (22), which is formed on the shielding sleeve (12), at a free end (16) of the shielding sleeve (12), at which free end the plug connector can be fastened to a wall by means of the shielding sleeve (12).

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