FR2913822A1 - Tubular shape electromagnetic shielding sheath connecting device, has terminal end with annular opening groove formed on both sides of face of end edge of tubular shape electromagnetic shielding sleeve - Google Patents

Abstract

The device has a terminal end that is made of an electrical conductor material, where the end includes an annular opening groove formed on both sides of face of an end edge of a tubular shape electromagnetic shielding sleeve and for pinching the edges. The terminal has an edge flap that is folded towards the interior of a cylindrical section (4). A pinching zone has annular ribs provided on side interior faces of the groove.

Description

The present invention relates to shielding devices

  electromagnetic for bundles of electrical conductors.

  It has long been known that electricity conductors can be shielded to prevent the reception and emission of electromagnetic waves

  likely to modify the electrical currents flowing through the conductors, or to generate disturbances in the environment.

  Among the many types of electricity conductors that are advantageously shielded, there are in particular the so-called "VDI" cable bundles (voice, data, images) which connect devices such as

  microcomputers, phones, cameras. There are also bundles of cables in motor vehicles, as well as bundles of cables in various applications.

  Electricity conductors usually connect electrical appliances to each other. The electrical connection between the conductors of a bundle of conductors and an apparatus is via a terminal device.

  A first known solution consists in shielding each of the conductors of the bundle of conductors. However this solution is relatively expensive, and substantially increases the volume and weight of the conductor bundle. A second solution is to join several electricity conductors parallel to each other, thereby forming a bundle of electricity conductors, and to achieve overall shielding of the bundle of electricity conductors. The shielding of a conductor bundle is usually effected by means of an electromagnetic shielding sheath, which surrounds the bundle of conductors.

  This shielding sheath is generally in the form of a tubular braid,

  made of metal wires braided in flexible tube. More recently, we have

  proposed mixed shielding braids, i.e. consisting of plastic strands and metal strands. To ensure effective shielding, and in particular to prevent a section of conductor bundle from being exposed, not covered by the electromagnetic shielding sheath, it must be held mechanically fixed at its ends and connected to a reference potential. such as mass.

  A first possibility for mechanically securing the end of the electromagnetic shielding sheath and for connecting it to the reference potential is to weld the end of the electromagnetic shielding sheath 50841 to a fixed metal part. that is connected to said reference potential. But the welding operation is delicate and difficult to automate. It is also known to connect an electromagnetic shielding sheath with a clamping ring. This clamping ring surrounds the end of the electromagnetic shielding sheath and clamps it onto a cylindrical portion of a metal connector, itself providing the connection of the electrically conductive bundle, and itself connected to the potential. reference. However, this device requires, for its implementation, five successive actions. The first is the threading of the conductors in the electromagnetic shielding sheath, the second is the electrical connection between the conductors and the connector, the third is the engagement of the end of the electromagnetic shielding sheath around the cylindrical portion of the shield. connector, the fourth is the engagement of the clamping ring on said electromagnetic shielding sheath portion surrounding the cylindrical connector portion, and the fifth is clamping of the clamping ring. This known system thus has the major drawbacks of being expensive and of requiring a long assembly time, which is not very suitable for automation.

  The problem proposed by the present invention is to design an electromagnetic shielding sheath connection device that can be installed on an electromagnetic shielding sheath quickly and easily, preferably automatable, which is inexpensive to manufacture, and which on the one hand facilitates the possible mechanical fastening of the electromagnetic shielding sheath to a terminal device and, on the other hand, the electrical connection of the electromagnetic shielding sheath to a reference potential. To achieve these and other objects, the invention provides, in a first aspect, a connection device for electromagnetic shielding sheath, which comprises a tip of electrically conductive material having an annular deformation zone adapted for s to apply in opposition to one and the other of the faces of the end edge of the electromagnetic shielding sheath and to pinch said edge. This device has a simple shape that can be easily achieved by stamping a single piece. The solution chosen for the mechanical attachment of the electromagnetic shielding sheath to the tip is the pinching of the annular deformation zone. This choice allows a fast fixing by a single automatable mechanical action, to form an electromagnetic shielding sheath that can be easily fixed and connected. Attachment of the tip to the electromagnetic shielding sheath takes place even before the electrical conductors are slipped inside the electromagnetic shielding sheath.

  The connecting device of the invention makes it possible to trap the free strands of the electromagnetic shielding sheath, which strands are always aggressive.

  The pinching zone can take different forms depending on the needs of the end user, provided that the inner wall can be pushed towards the outer wall by enclosing and securing the end of the electromagnetic shielding sheath.

  Depending on the shape given to this pinching zone, it may serve as a fastener in a smooth tube or around a smooth tube by buttressing.

  According to one embodiment of the invention, the tip may comprise a cylindrical section and an end flap to form an open annular groove adapted to receive and retain after deformation the end edge of the electromagnetic shielding sheath.

  The fact that the tip is cylindrical and in direct contact with the strands of the electromagnetic shielding sheath over its entire circumference guarantees a good electrical connection.

  This annular groove structure can itself be made simply and inexpensively by deformation of metal. For example, we can start from a metal strip that is cut and stamped to produce a cylindrical section of blank including the flap.

  Advantageously, the end flap of the end piece may be folded towards the inside of the cylindrical section.

  Thus, once assembled with the tip of the invention, the electromagnetic shielding sheath is located inside the cylindrical section of the tip, and this cylindrical section constitutes a surface accessible from the outside.

  30 and suitable for mechanical attachment and / or electrical connection of the tip.

  Also, the invention may provide that the cylindrical portion of the nozzle is of greater length than the end flap.

  This configuration allows better guiding of the shielding sheath and facilitates the connection to a terminal device.

  The open annular groove may advantageously comprise a nip zone. 5084FDEP.doc A pinch made at a narrower pinch area than the open annular groove makes it possible to mechanically fix the braid to the bit more effectively. According to a first embodiment of the pinch zone, an annular rib may be provided on one and / or the other of the lateral inner faces of the open annular groove. This pinch zone configuration is simple to manufacture by deformation, and effective. The open annular groove may be generally cylindrical. In this case, during assembly, the end section of the tubular-type shielding sheath easily slides inside the open annular groove by a simple movement of axial movement of the endpiece. According to a second embodiment, the nipping zone may be at the junction of a first groove section and a second groove section of the open annular groove which, at the end of mounting of the end piece on the sheath. electromagnetic shielding, have angular divergence between them. Angular divergence means that, at the end of assembly, the first section of the annular groove remains cylindrical and straight while the second section of the annular groove is deformed concentrically outwards. The second section may for example become conical. Advantageously, in this second embodiment, the initial angular divergence, before mounting, may be less than 45, that is to say that the second section forms a cone having a half-angle at the summit less than 45. Such angular divergence further makes it easy to thread the end of the shielding sheath into the open annular groove, and then to pinch it quickly and efficiently by deforming the second section outwardly. According to one embodiment of the invention, the tip may comprise an external protrusion of electrical connection, such as a male contact, a female contact, an eyecup. Thus, the tip can be easily connected to a selected reference potential which limits the electromagnetic disturbances. Practice shows that a connection of the external ground connection protrusion of the electrical apparatus to which the tip is connected significantly reduces the disturbances both transmitted and received. It is advantageous to provide the tip with a shape for simple and reliable mechanical attachment to a terminal device such as an electronic device connector body. Advantageously, the tip according to the invention may thus comprise peripheral reliefs capable of cooperating with complementary reliefs of a terminal device for its attachment to said terminal device. In practice, according to a first embodiment, the peripheral reliefs of the nozzle may comprise an outer annular rib on which an inner annular groove of said radial or axial assembly two-piece terminal device is arranged. The fixing solution by such positive and negative forms is simple and effective, and can be automated. In practice, according to a second embodiment, the peripheral reliefs may comprise an annular outer or inner rib on which resilient latching means of a terminal device may be engaged during axial engagement of the terminal device on the tip. It is then a simple, effective and fast snap-in solution for assembling an electromagnetic shielding sheath end to a terminal device.

  Alternatively or in addition to peripheral reliefs, the tip may comprise at least one eyecup that can accommodate a screw for attaching the tip to a terminal device. This alternative solution allows a reliable assembly of the electromagnetic shielding sheath end to a terminal device.

  In practice, the terminal device may be an electrical connector, or an electronic device housing, or a crossed wall. Thus, the device of the invention can be used in particular in the three most common modes of use, but this list is not limiting.

  According to a second aspect, the present invention proposes a tubular electromagnetic shielding sheath which may comprise, at at least one of its ends, a connection device as defined above, the end of the sheath being able to be pinched in an annular groove. open connection device.

  Thanks to the ease of placing the tip on the electromagnetic shielding sheath, it can be understood that the electromagnetic shielding sheath and the connection piece for electromagnetic shielding sheath 84FDEP.doc 6 electromagnetic can be preassembled and sold as a all. Thus, the professional buyers of this set have only to introduce the bundle of electrical conductors inside the electromagnetic shielding sheath and possibly fix a connector. Thanks to this set, an armor still

best is assured.

  In this assembly, the end of the electromagnetic shielding sheath is pinched in the open annular groove of the connecting device.

  This electromagnetic shield braid assembly and ferrule is very

  easily assembled, only one mechanical tightening operation is necessary.

  According to a third aspect, the invention proposes a bundle of electrical conductors enclosed in an electromagnetic shielding sheath having at least one connecting device according to the present invention; the electrical conductors can be connected to a connector itself attached to the

connecting device.

  According to this aspect, the invention proposes an assembly which is simple assembly, reliable, inexpensive, easy to manufacture, and which provides a suitable shielding that meets the requirements of absence of electromagnetic disturbances.

  Other Objects, Features and Advantages of the Present Invention

  will emerge from the following description of particular embodiments, made in connection with the accompanying figures, among which:

  - Figure 1 is a side view in longitudinal section of a connecting device according to a first embodiment of the invention;

  FIG. 2 is a view from above of the device of FIG. 1;

  FIG. 3 is a side view in longitudinal section of a connection device according to the embodiment of FIG. 1, in a first possible form after assembly to an electromagnetic shielding sheath;

  FIG. 4 is a side view in longitudinal section of the connecting device of the invention according to the embodiment of FIG.

  second possible form after assembly to an electromagnetic shielding sheath;

  - Figure 5 is a top view of the device of Figure 4;

  FIG. 6 is a side view in longitudinal section of the device

  connection according to the embodiment of Figure 1, in a third form

  possible after assembly to an electromagnetic shielding sheath; Figure 7 is a longitudinal sectional side view of the connecting device according to the embodiment of Figure 1, in a fourth possible form after assembly to an electromagnetic shielding sheath;

  FIG. 8 is a side view in longitudinal section of a device for

  connection according to a second embodiment of the invention;

  - Figure 9 is a side view in longitudinal section of a connecting device according to a third embodiment of the invention;

  - Figure 10 is a side view in longitudinal section of a connecting device according to a fourth embodiment of the invention;

  - Figure 11 is a side view in longitudinal section of a connecting device according to the invention fixed by latching to a terminal device such as an electrical connector according to a first embodiment;

  FIG. 12 is a side view in longitudinal section of a connecting device according to the invention fixed by snapping into a terminal device such as an electrical connector according to a second embodiment;

  - Figure 13 is a side view in longitudinal section of a connecting device according to the invention fixed in a terminal device according to a third embodiment;

  Figure 14 is a longitudinal sectional side view of the device of Figure 8, in a possible form after assembly to an electromagnetic shielding sheath of the invention;

  - Figure 15 is a longitudinal sectional side view of the device of Figure 4 fixed to a longitudinal wall of a terminal device;

  FIG. 16 is a side view in longitudinal section of a connecting device according to the invention attached to a transverse wall of a terminal device;

  FIG. 17 is a view from above of the device of FIG. 16; FIG. 18 is a side view in longitudinal section of a device

  connection according to the invention fixed to a terminal device by an assembly

30 screw-nut;

  - Figure 19 is a side view in longitudinal section of a connecting device according to the invention fixed to a terminal device by a clamping ring;

  Figure 20 is a top view of the device of Figure 19; Figure 21 is a side view of the connecting device according to the invention attached to a double-shell connector; and Fig. 22 is a partial sectional front view of the device of Fig. 21.

  In Figure 1, there is shown a connection device according to a first embodiment of the invention. This device comprises a tip 1 with external protrusion of electrical connection 3. The tip 1 comprises two ends, a first end 1a and a second end 1b. The external protrusion of electrical connection 3 is located at the first end 1a. It may be a connection tab of usual shape, for example 1.5 mm wide, 0.8 mm thick, 10 mm long. Alternatively, it may be a female contact adapted to receive a male connection lug, or an eyepiece lug adapted to receive a screw. A deformable open annular groove 5 is located at the second end 1b.

  In this embodiment, the tip 1 is a one-piece tubular piece of electrically conductive material, for example tinned brass, consisting of a lateral peripheral wall 2 having a suitable thickness E, for example of approximately 0, 4 mm, and an appropriate length L, before any deformation.

  This lateral peripheral wall 2 comprises a cylindrical section 4 having a length Lo, a first conical section 2a developing radially outwards and having a length L1, a second conical section 2b developing radially inwards and having a length L2 , and a third conical section 2c having a length L3, for a diameter D1. The length L is the sum of the lengths Lo, L1, L2 and L3. These dimensions may be, for example: L = 15 mm; Lo = 10 mm; L1 = 1.5 mm; L2 = 2.5 mm; L3 = 1 mm; D1 = 15 mm. These dimensions may be modified to accommodate different diameters of sheaths of conductors to be connected.

  To form the sections of length L1i L2 and L3, we can start from a strip that is stamped to give it the shape of a cylindrical tube of revolution of length L that is deformed to make the first conical section 2a of length L1 and half-angle at the apex 131 of about 45, to make the second conical section 2b of length L2 and half-angle at the apex (32 of about 60, and to form the third conical section 2c of length L3 and half-angle at the top 133 of about 15.

  The sections 2a, 2b and 2c form the open annular groove 5 oriented towards the inside of the end piece 1 and toward the first end 1a of the end piece, and the

  sections 2b and 2c constitute an end flap 6. The sections 2a and 2b form

  an annular outer rib 12.

  FIG. 2 is a view from above of the connection device of FIG. 1. The external projection of electrical connection 3 with eyelet 3a can be distinguished, and the sections 4, 2a, 2b and 2c can be seen.

  As illustrated in FIGS. 1 and 2, the section 4 is cylindrical of

  revolution, of diameter D ,. The outer annular rib 12 has a diameter D2. The diameter D3 corresponds to the fold line between the distal end of the section 2b and the section 2c. The diameter D4 corresponds to the free end of the section 2c. The diameter D is smaller than the diameter D2 but larger than the diameters D3

and D4.

  FIG. 3 is a side view in longitudinal section of a connecting device according to the embodiment of FIGS. 1 and 2, in a first possible form after assembly to an electromagnetic shielding sheath 7.

  The same essential means are identified by the same reference numerals as in FIGS. 1 and 2.

  During assembly, the end section of the electromagnetic shielding sheath 7, which is generally tubular, is inserted axially into the endpiece 1 via the first end 1a and is directed towards the second end 1b of the endpiece 1. A radial force F is applied on the end flap 6 from the inside to the outside, for example by axial engagement of a conical tool,

  to deform and radially press against the end portion of the electromagnetic shielding sheath 7. The open annular groove 5 consists of a first groove section 5a and a second groove section 5b. The first throat section 5a is at an angle a with the second section

  5b, an angle that is designated by the term "angular divergence" in the description and the claims. In this first possible form, the angular divergence a is approximately 45, substantially equal to the initial angle 131 between the sections 4 and 2a in FIG. 1. During assembly, the fold between the first groove section 5a and the second groove section 5b is brought closer to the fold between the section

  cylindrical 4 and the conical section 2a; this constitutes a pinch zone 8.

  Figures 4 and 5 illustrate a connection device according to the mode

  embodiment of FIGS. 1 and 2, in a second possible form after

  assembly with electromagnetic shielding sheath 7.

  The same essential means are marked with the same numerical references as in FIG. 3. It can be seen that between the first form (FIG. 3) and the second form (FIG. 4) the angular divergence has been increased, and is about 90.

  FIG. 6 is a longitudinal sectional side view of a connection device according to the embodiment of FIGS. 1 and 2, in a third embodiment

  possible form after assembly to an electromagnetic shielding sheath 7. In this third possible form, the angular divergence a is about 135.

  The same essential means are identified by the same reference numerals as in FIG.

  FIG. 7 is a sectional view of a connection device according to

  the embodiment of Figures 1 and 2, in a fourth possible form after assembly to an electromagnetic shielding sheath 7. In this fourth possible form, the angular divergence a is about 180.

  The same essential means are identified by the same reference numerals as in FIG.

  It is understood that the greater the angular divergence ci, the greater the nip is effective in the fold zone between the sections 5a and 5b of the annular groove 5. The electromagnetic shielding sheath 7 is then extremely well held in place in the mouthpiece 1.

  FIG. 8 is a side view in longitudinal section of a device for

  connection according to a second embodiment of the invention. The same essential means are identified by the same numerical references as in FIG. 1. In this embodiment, the end piece 1 is a one-piece tubular piece made of electrically conductive material, for example made of tinned brass,

  consisting of a lateral peripheral wall 2 having a suitable thickness, for example about 0.4 mm, a suitable length L, before any deformation.

  This lateral peripheral wall 2 comprises a cylindrical section 4 having a length L5 and an end flap 6 of the end piece 1 of a length L6. The end flap 6 is formed by folding, towards the inside of the end piece 1, of the wall

  device 2, until the end flap 6 is parallel to the peripheral wall 2. The dimensions can be given, for example: L5 = 25 mm, L6 = 5 mm. In this particular embodiment, the nip zone 8 comprises two annular ribs N1 and N2 each formed on one of the lateral inner faces 35 of the open groove 5. Thus, a first annular rib N1 is formed on the flap of FIG. end 6 and is directed towards the outside of the end piece 1. A second annular rib N2 is made with respect to the first rib N, on the cylindrical section 4 and is directed towards the inside of the Tip 1. A nip 8 between the two annular ribs N 1 and N 2 thus has a first baffle shape. Fig. 9 is a sectional view of a connecting device according to a third embodiment of the invention. The same essential means are identified by the same reference numerals as in FIG. 1. This embodiment is inspired by the embodiment illustrated in FIG. 8. The difference lies in the fact that, in this embodiment, the second Annular rib N2 is formed, such as the first annular rib N ,, towards the inside of the tip 1. The niping zone 8 thus has a baffle shape, different from the previous one. Figure 10 is a side view in longitudinal section of a connecting device according to a fourth embodiment of the invention. The same essential means are denoted by the same reference numerals as in FIG. 1. This embodiment is inspired by the embodiment illustrated in FIG. 8. The difference lies in the fact that, in this embodiment, the first Annular rib N, and the second annular rib N2 are formed outwardly of tip 1. Pinch zone 8 thus has a baffle shape, different from the previous ones. FIGS. 11, 12 and 13 show three different embodiments of the means for assembling a connection device according to the invention to a terminal device 9. The connection device illustrated is in accordance with the embodiment of the FIG. 6. Figure 11 shows a tip 1 with its outer projection of electrical connection 3. For clarity, the electromagnetic shielding sheath 7 is not shown in this figure. The terminal device 9 comprises peripheral reliefs 10 with an inner annular groove 11a that can accommodate the outer annular rib 12 of the nozzle 1. The mechanical connection between the end device 9 and the tip 1, previously assembled to the sheath electromagnetic shielding 7, is made by snapping: during the axial engagement of the nozzle 1 in the terminal device 9 as illustrated by the arrow A, the end nozzle 9a of the terminal device 9 radially deviates as illustrated by the arrow B, and the outer annular rib 12 then engages in the inner annular groove 11a and is retained by the end nose 9a which returns elastically in position. FIG. 12 shows a tip 1 with its external electrical connection protrusion 3. For the sake of clarity, the electromagnetic shielding sheath 7 is not shown in this figure. The terminal device 9 comprises peripheral reliefs 10 with an outer annular groove 11b that can accommodate the section 2c of the nozzle 1, which projects towards the inside of the nozzle 1 in excess of the cylindrical section 4. The mechanical connection between the terminal device 9 and the tip 1, previously assembled to the electromagnetic shielding sheath 7, is thus made by snapping: during the axial engagement of the tip 1 on the terminal device 9 as illustrated by the arrow A, the end nozzle 9a of the terminal device 9 approaches radially as illustrated by the arrow C, and the section 2c then engages in the outer annular groove 11b and is retained by the end nose 9a which returns elastically in position. FIG. 13 represents a connection device according to FIG. 4 fixed in a terminal device 9 according to a third embodiment. The terminal device 9 comprises peripheral reliefs 10 having an inner annular groove 11a that can receive the outer annular rib 12 of the nozzle 1. The mechanical connection between the end device 9 and the tip 1, previously assembled to the shielding sheath electromagnetic 7, is made by radial clamping D: the terminal device 9, consisting of two shells 9b and 9c, surrounds the nozzle 1 and is held together by a mechanical element 13 radial clamping. FIG. 14 represents the device of FIG. 8, in a possible form after assembly to an electromagnetic shielding sheath 7. The same essential means are marked with the same numerical references as in FIG. 8. The electromagnetic shielding sheath 7 is pinched by the tip 1 at the pinch zone 8. Figures 15 to 22 show the tip 1 of Figure 4, and its assembly with a terminal device 16 or 9. For clarity, the electromagnetic shielding sheath 7 is not shown in these figures. The same essential means are identified by the same reference numerals as in FIG. 4. In the embodiments illustrated in these figures, the device of the invention comprises at least one eyelet 14 or hole through a support leg, able to accommodate a screw FIG. 15 illustrates a first form of assembly between the end piece 1 and a terminal device having a longitudinal wall 16, oriented parallel to the cylindrical section 4 of the end piece. 1.

  The outer protrusion connection 3 serves as a support leg. She

  comprises two eyelets 14 and 14a and is folded to come into contact with the wall 16. The wall 16 is provided with two holes 16a and 16b that can accommodate screws. In practice, the external connection protrusion 3 is arranged so that the eyelets 14 and 14a are facing the holes 16a and 16b. The fixing screws can thus penetrate into the eyelets 14 and 14a and into the holes 16a and 16b

  to maintain the mouthpiece 1.

  FIGS. 16 and 17 illustrate another form of assembly between a nozzle 1 and a terminal device having a transverse wall 16, oriented perpendicularly to the cylindrical section 4 of the nozzle 1.

  In this embodiment, the tip 1 has an outgrowth

  external connection 3 eyecup 3a and three support legs 21a, 21b and 21c.

  The three support tabs 21a, 21b and 21c are each provided with a respective eyelet 14a, 14b or 14c that can accommodate a screw and can be positioned facing a corresponding hole such as the holes 16a and 16b of the wall 16.

  Figure 17 illustrates a possible position of the three support legs 21a, 21b and 21c. Figures 18 to 22 show several possible forms of assembly of the tip 1 to a terminal device 9.

  FIG. 18 represents a first embodiment for

  the assembly of the tip 1 and the terminal device 9. The assembly is here made using a nut 17 and a threaded portion 18 belonging to the terminal device 9.

  The nut 17 has an inner face 17a adapted to abut against the portion 2a of the nozzle 1. The threaded portion 18 is then screwed into the nut 17 to be mechanically held by the nut 17.

  FIGS. 19 and 20 show a second embodiment of assembly of the tip 1 to a terminal device 9. In this embodiment, the terminal device 9 has a cradle receiving the tip 1 at the cylindrical section 4. A clamp 20 surrounds and clamps the cylindrical section 4 and the cradle.

  Figures 21 and 22 illustrate an application of the device of Figure 13 to an electrical connector 9. 84FDEP.doc 14 The electromagnetic shielding sheath 7 is fixed in the nozzle 1 according to the invention. The end piece 1 is assembled to the electrical connector 9 according to FIG. 13. The conductors 22 of the conductor bundle are introduced into the body of the electrical connector 9 delimited by the two shells 9b and 9c, and make it possible to provide the electrical connection.

  The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof within the scope of the claims below.

5O84FDL'P.doc

Claims (5)

  1 - Connection device for electromagnetic shielding sheath, characterized in that it comprises a tip (1) of electrically conductive material comprising an annular deformation zone (5) adapted to be applied in opposition to one another. and the other of the faces of the end edge of the electromagnetic shielding sheath (7) and for clamping said edge. 2 - Connecting device according to claim 1, characterized in that the tip (1) comprises a cylindrical section (4) and an end flap (6) to form an open annular groove (5) adapted to receive and to retain after deformation the end edge of the electromagnetic shielding sheath (7). 3 - Connecting device according to claim 2, characterized in that the end flap (6) of the nozzle (1) is folded towards the inside of the cylindrical section (4). 4 - Connecting device according to one of claims 2 or 3, characterized in that the cylindrical section (4) of the nozzle (1) is of greater length than the end flap (6). 5 - Connecting device according to any one of claims 2 to 4, characterized in that the open annular groove (5) comprises a nip (8). 20 6 ù Connecting device according to claim 5, characterized in that the nip (8) comprises an annular rib (N ,, N2) on one and / or the other of the inner side faces of the annular groove open (5). 7 ù Connecting device according to one of claims 5 or 6, characterized in that the open annular groove (5) is generally cylindrical. 25 8 ù Connection device according to claim 5, characterized in that the nip (8) is at the junction of a first throat section (5a) and a second throat section (5b) of the throat open ring (5) having angular divergence between them (a). Connecting device according to claim 8, characterized in that the angular divergence (a) is less than 45. 10 ù Connecting device according to any one of claims 1 to 9, characterized in that the tip (1) comprises an external protrusion of electrical connection (3), such as a male contact, a female contact, an eyepiece . 35 11 - Connection device according to any one of claims 1 to 10, characterized in that the tip (1) comprises peripheral reliefs (10) capable of cooperating with complementary reliefs (11a). B) of a terminal device (9) for attachment to said terminal device (9). Connecting device according to Claim 11, characterized in that the peripheral reliefs (10) comprise an outer annular rib (12) on which an internal annular groove (11a) of said two-piece terminal device (9) is arranged. with radial or axial assembly. 13 - Connecting device according to claim 11, characterized in that the peripheral reliefs (10) comprise an annular rib (12) outer or inner on which can engage resilient means 10 for snapping (9a) a device terminal (9). Connecting device according to any one of Claims 1 to 10, characterized in that the end piece (1) comprises at least one eyecup (14) able to receive a screw allowing the attachment of the end piece (1) to terminal device (9). Connecting device according to any one of claims 11 to 14, characterized in that the terminal device (9) is an electrical connector, an electronic device housing, or a wall through which it passes. Tubular electromagnetic shielding sheath (7) characterized in that it comprises, at at least one of its ends, a connecting device (1) according to any one of claims 1 to 15. 17 - Electromagnetic shielding sheath (7) tubular according to claim 16, characterized in that its end is pinched in an open annular groove (5) of the connecting device (1). 18 - Electrical conductor bundle enclosed in an electromagnetic shielding sheath having at least one connecting device (1) according to any one of claims 1 to 15, the electrical conductors being connected to an electrical connector (9) itself fixed to the connecting device (1).