EP0519842B1 - Rotational insulation displacement connector - Google Patents

Description

The present invention relates to a self-stripping connection device of the rotary type, for non-stripped electrical wire, such a device being for example usable for producing a strip or other module for interconnecting telephone or computer lines.

Rotary type insulation displacement connection devices are now well known. Devices of this type are for example described in documents DE-A-1,640,633, EP-A-92,953, FR-A-2,622,362, and FR-A-2,642,907.

All of these known devices generally comprise a metallic, cylindrical and tubular contact member which is kept fixed in position and which is perforated with at least one transverse insulation displacement slot which is oriented in an arc of circumference or helix, depending on whether this insulation displacement slot is included in a plane of section orthogonal to the axis of the cylinder formed by this tubular contact or in a plane of section more or less oblique with respect to this plane. The entry of this transverse slot is widened to facilitate the introduction of the wire, and in order to force, by a rotational movement around an axis coincident with that of the cylinder, this wire in this insulation displacement slot, these devices include a barrel which encapsulates this metallic contact and which is coaxial with the latter. A transverse slot is generally provided on the external transverse face of this barrel to receive a screwdriver. A rotation imposed on this barrel, for example of about a quarter of a turn, forces the electric wire into the insulation displacement slot, which makes the connection in a simple and rapid movement, and using a tool to the reach of all.

For all these known devices, the wire to be connected must first be introduced into a round orifice provided for this purpose in the barrel. The crossing of this orifice by the wire allows it to pass through the wall of the metal cylinder, precisely at the enlarged entry of the insulation displacement slot with which it is perforated.

The fact, for the installer, of having to introducing each wire to be connected into a round orifice, which is moreover most often provided on the side of the connector, is often very disadvantageous because this introduction operation is relatively delicate, and is often difficult depending on the position of the strip which includes rotary insulation displacement connectors.

• . en ce que cet organe de contact tubulaire est fendu le long d'une génératrice de façon à y dégager, depuis son arête transversale externe et au moins jusqu'à parvenir à l'entrée élargie de la fente transversale autodénudante, une fente longitudinale de largeur partout suffisante pour, tout le long de cette fente, librement livrer passage au fil électrique non-dénudé; et
• . en ce que le barillet coaxial présente une profonde rainure diamétrale sur sa face externe transverse, cette rainure étant elle-aussi de largeur suffisante pour librement recevoir le fil non-dénudé et étant de profondeur telle que son fond arrive, après montage du barillet, au niveau de ladite entrée élargie de la fente transversale autodénudante;

de sorte que, le barillet coaxial ayant été préalablement tourné jusqu'en une position où cette rainure vient coïncider avec cette fente longitudinale de l'organe de contact pour former à elles-deux une profonde rainure diamètrale unique, le fil non dénudé peut alors être introduit "peigné", c'est à dire par le dessus du dispositif de connexion et en travers par rapport à celui-ci, dans cette rainure diamètrale unique et être poussé jusqu'au fond de celle-ci, par exemple à l'aide d'un outil du genre tournevis, la connexion autodénudante étant ensuite réalisée classiquement, c'est à dire en faisant tourner ce barillet coaxial pour forcer le fil dans ladite fente transversale autodénudante jusqu'à réaliser ainsi la connexion autodénudante de ce fil.The invention aims to remedy this drawback. To this end, it relates to a rotary type insulation displacement connection device, this device comprising on the one hand a metallic contact member, at least partially cylindrical and tubular, which is held fixed in position and which is perforated on its tubular part at least one transverse insulation displacement slit with enlarged entry, and comprising, on the other hand, a coaxial barrel which is arranged to force, by a rotational movement which is conferred on it after introduction of the non-stripped electrical wire both into this barrel and this tubular contact member, this non-stripped wire in this self-stripping transverse slot, and this device being characterized:

• . in that this tubular contact member is split along a generatrix so as to release therefrom, from its external transverse edge and at least until reaching the enlarged entry of the transverse insulation displacement slot, a longitudinal slot of width everywhere sufficient for, all along this slot, to freely give way to the non-stripped electric wire; and
• . in that the coaxial barrel has a deep diametrical groove on its transverse external face, this groove also being of sufficient width to freely receive the non-stripped wire and being of such depth that its bottom arrives, after assembly of the barrel, at level of said enlarged entry of the insulation displacement transverse slot;

so that, the coaxial barrel having previously been rotated to a position where this groove coincides with this longitudinal slot of the contact member to form together a single deep diametrical groove, the non-stripped wire can then be introduced "combed", ie from above and across the connection device, into this single diameter groove and be pushed to the bottom thereof, for example using a tool of the screwdriver type, the insulation displacement connection then being conventionally carried out, that is to say by rotating this coaxial barrel to forcing the wire into said transverse insulation displacement gap until thus achieving the insulation displacement connection of this wire.

Preferably, this tubular metallic contact member is further provided with a cutting edge or blade which is positioned on this contact member so that this last movement of rotation of the barrel simultaneously comes to force the electric wire against this edge or blade. cut so as to cut, in the same movement which leads to the insulation displacement connection, this electric wire slightly downstream of the connection point.

Advantageously, the barrel is inside the tubular part of this metallic contact member.

Preferably also, this barrel, whether it is inside this metal contact or on the contrary it caps the latter, is provided on its transverse external surface with another diametrical groove which is orthogonal to the first aforementioned and which is preferably of depth less than that of the latter, this other groove being intended to receive the aforementioned tool of the screwdriver type, so as to be able to thus push the wire to the bottom of the first aforementioned deep groove in a movement of longitudinal translation of this tool, then, without releasing the latter, rotate the barrel by a rotational movement of the same tool, in order to achieve, in this last movement, said insulation displacement connection of the wire as well as, if the contact member has said edge or cutting blade, simultaneous cutting of this wire.

• Figure 1 est une vue en perspective de ce dispositif dans une première forme de réalisation;
• Figure 2 est une perspective de son organe de contact;
• Figure 3 est une vue en perspective de son barillet;
• Figures 4, 5 ainsi que 6, puis 7, montrent les phases successives d'une connexion autodénudante réalisée avec ce dispositif;
• Figure 8 est une vue de détail de la fente transversale autodénudante, avec illustration des phases successives de la connexion réalisée dans cette fente;
• Figures 9,10,11 sont des vues respectivement semblables à Figures 1,2,3 et montrant une seconde forme de réalisation, d'utilisation un peu plus commode que la précédente, de ce dispositif de connexion auto-dénudante;
• Figures 12,13,14 illustrent les phases successives d'une connexion auto-dénudante réalisée avec ce dispositif dans cette seconde forme de réalisation;
• Figures 15,16,17 sont des vues respectivement semblables à Figures 1,2,3 et montrant une troisième forme de réalisation de ce dispositif de connexion auto-dénudante;
• Figures 18 et 19 illustrent les phases successives d'une connexion auto-dénudante réalisée avec ce dispositif dans cette troisième forme de réalisation;
• Figures 20 à 25 sont de schématiques illustrations de quelques possibilités de montage de dispositifs selon l'invention pour leur intégration dans un ensemble.

In any case, the invention will be well understood, and its advantages and other characteristics will emerge, during the following description of three non-limiting examples of embodiment of this insulation displacement connection device, with reference to the appended schematic drawing in which:

• Figure 1 is a perspective view of this device in a first embodiment;
• Figure 2 is a perspective of its contact member;
• Figure 3 is a perspective view of its barrel;
• Figures 4, 5 and 6, then 7, show the successive phases of an insulation displacement connection made with this device;
• Figure 8 is a detail view of the insulation displacement transverse slot, with illustration of the successive phases of the connection made in this slot;
• Figures 9,10,11 are views respectively similar to Figures 1,2,3 and showing a second embodiment, of use a little more convenient than the previous one, of this self-stripping connection device;
• Figures 12,13,14 illustrate the successive phases of a self-stripping connection made with this device in this second embodiment;
• Figures 15,16,17 are views respectively similar to Figures 1,2,3 and showing a third embodiment of this self-stripping connection device;
• Figures 18 and 19 illustrate the successive phases of a self-stripping connection made with this device in this third embodiment;
• Figures 20 to 25 are schematic illustrations of some possibilities for mounting devices according to the invention for their integration into an assembly.

Referring first of all to FIGS. 1 to 3, this rotary insulation displacement connection device 1, of generally cylindrical appearance, is for example designed to be permanently fixed in a support 2 made of plastic material for example to constitute, with a greater or lesser number of other connectors 1 of this type, a strip or module for interconnecting telephone or computer lines.

• . un organe de contact métallique 3, cylindrique et partiellement tubulaire; et
• . un barillet cylindrique 4 qui est par exemple métallique lui-aussi.

This connector 1 is made up of two separate parts:

• . a metallic contact member 3, cylindrical and partially tubular; and
• . a cylindrical barrel 4 which is also metallic, for example.

The barrel 4 is mounted inside the tubular part 5 of the contact member 3, so that these two parts 3, 4 are then coaxial and that, the external dimensions of the barrel 4 corresponding substantially to the internal dimensions of the tubular part 5 apart from allowing free rotation of the barrel 4, this barrel can rotate with gentle friction in this tubular part 5 of the contact member 3.

As is the case with all known self-stripping rotary connectors, the tubular part 5 of the metal cylinder 3 is perforated with a self-stripping slot 6, the inlet 7 of which is widened in the shape of a "V" in order to facilitate lateral insertion. non-stripped wire in this slot 6.

The tubular part 5 is further perforated with a longitudinal slot 8, the constant width of which is slightly greater than the total thickness of the non-stripped wire to be connected, and which, starting from the circular external upper edge 9 of the tube 5 , descends as shown at least up to the level of the “V” entry 7 of the slot 6, and more precisely until it comes to extend this entry 7 transversely, so that the non-stripped wire can, as will be seen hereinafter with reference to FIGS. 4 to 6, be inserted diametrically and from above into the slot 8, that is to say "combed" in jargon by profession, and be lowered along the latter until reaching in front of the enlarged entry 7 of the insulation displacement slot 6, which is therefore substantially orthogonal to the slot 8.

Furthermore, a small cutting blade 10 is provided on the circular external edge 9, and is positioned thereon substantially diametrically opposite the slot 8, and more precisely substantially diametrically opposite the longitudinal edge 11 of this slot 8 which is circumferentially closest to the “V” entry 7 of the insulation displacement transverse slot 6.

This small cutting blade 10 is, in this embodiment, flat and contained in a plane transverse to the axis of the circular edge 9.

The coaxial barrel 4, which is also very specific, is clearly shown in FIG. 3. It is a solid cylinder which, in contrast to the barrels of known rotary insulating contact contacts, is designed to be positioned inside. of the metal tube 5 with an insulation displacement slot 6 and not for hooding this metal tube.

• . une première est très profonde rainure 12, dont la profondeur est telle que le fond 13 de cette rainure arrive, lorsque le barillet 4 est monté à l'intérieur du cylindre 5 comme représenté en Figure 1, au même niveau que celui de l'entrée élargie 7 de la fente autodénudante 7, de telle sorte que, le barillet étant tourné comme en figure 1 pour que cette rainure 12 vienne coïncider avec la fente 8 pour, somme toute, ne former à elles-deux qu'une seule rainure, et bien-entendu cette rainure 12 étant sensiblement de même largeur que celle de cette fente 8 c'est-à-dire étant en tous cas apte à recevoir le fil non dénudé, il est alors possible d'introduire ce fil par le dessus (figures 4 à 6), c'est-à-dire "peigné", dans cette rainure unique 12,8 et de l'y faire descendre jusqu'à ce qu'il parvienne devant l'entrée élargie 7 de la fente 6; et
• . une seconde et un peu moins profonde rainure diamètrale 14, orthogonale donc à la rainure 13, dont la largeur est suffisante pour recevoir un tournevis (figure 5).

As shown, it is split by two deep diametrical grooves, orthogonal to each other:

• . a first is a very deep groove 12, the depth of which is such that the bottom 13 of this groove arrives, when the barrel 4 is mounted inside the cylinder 5 as shown in Figure 1, at the same level as that of the inlet enlarged 7 of the insulation displacement slot 7, so that, the barrel being rotated as in FIG. 1 so that this groove 12 comes to coincide with the slot 8 so that, all in all, they only form a single groove, and of course this groove 12 being substantially the same width as that of this slot 8, that is to say being in any case capable of receiving the non-stripped wire, it is then possible to introduce this wire from above (FIGS. 4 to 6), that is to say "combed", in this single groove 12.8 and to bring it down there until it reaches the enlarged entry 7 of the slot 6; and
• . a second and slightly less deep diametrical groove 14, therefore orthogonal to groove 13, the width of which is sufficient to receive a screwdriver (FIG. 5).

The difference dp of the depths of these two grooves 12 and 14 is substantially equal to the total thickness of the non-stripped wire which allows, as will be explained later (Figure 5), to push this wire well, with the screwdriver inserted in the groove 14, to the bottom 13 of the groove 12.

Of course, the external dimensions of the cylinder formed by the barrel 4 are such that, once the latter is placed coaxially in the contact member 3 as shown in FIG. 1, this barrel 4 can rotate freely and with gentle friction in the tube 5, which it finally practically fills. To do this, the external diameter of barrel 4 corresponds to diameter of the tube 5, with the clearance necessary for the realization of this free possibility of rotation of the barrel 4 with gentle friction against the internal wall of the tube 5. Furthermore, the depth of the tube 5 corresponds to the height H of the barrel 4, so that the latter, once put in place, simply rests on the bottom of this tube 5, from which it cannot, moreover, be removed after assembly due to the presence of the small cross-section blade 10. In this way also, the split outer upper face 15 of the barrel 4 arrives at the transverse level of the circular edge 9 of the tube 5, which makes it possible, as will be seen later (FIG. 7), to cut the wire by an effect shear.

The operation of this insulation displacement rotary switch will now be described with reference to FIGS. 4 to 8.

As shown in Figure 4, the non-stripped wire 16 is introduced into the rotary contactor 1 not, as in the prior art, through an orifice provided for this purpose, but "combed", that is to say that it is positioned, as shown, parallel to the upper face 17 of this contactor and above the latter, then lowered into this contactor, more precisely into the aforementioned composite groove 12, 8, parallel to itself. Of course, as mentioned previously, the barrel has previously been rotated, using a screwdriver 18, in one of the two positions for which the slot 8 comes to extend the groove 12.

This wire 16 is pushed, as shown in Figure 5, using the screwdriver 18 then introduced to do this in the groove 14, to the bottom 13 of the groove 12, which in this pushing movement by this screwdriver 18, causes the upstream portion 19 of the wire 16 to be raised upwards, by jamming it between the screwdriver 18 on the one hand and between the bottom 13 and the wall 20 of the tube 5 which is diametrically opposite the slot 8 on the other hand.

The position thus obtained for this wire 16 is then that more clearly shown in Figure 6, on which the screwdriver 18 is not shown for clarity of the drawing.

This screwdriver 18 is then turned a quarter turn which, as shown in Figure 7, both forces the wire 16 in the insulation displacement slot, and force the curved downstream end 19 thereof against the cutting blade 10, causing its cutting by shearing effect, after all in the same way as with a pair of scissors.

Due in particular to the internal position of the barrel 3 relative to the metal cylinder 5, the insulation displacement slot 6 has a few features which are apparent on the one hand in Figures 1,2,6,7, and on the other hand in Figure 8.

In width (Figure 8), this slot 6 of course has an "V" inlet 7, but this "V" is first followed by a conical part 21, with an opening angle less than that of "V" 7, then of an end portion 22 of substantially constant width, that is to say with substantially parallel edges.

In thickness (Figures 1, 2, 6, 7), the edges of this slot 6 are sharpened, that is to say bevelled and therefore sharp, on the major upstream part of the conical part 21, as well as possibly and practically on the entry part 7, while they are flat, and therefore not sharp towards the downstream bottom of this part 21, and all along the part 22. In fact, the cutting part stops at the level 23 of the slot 6 where the width of the latter is substantially equal to the thickness of the metallic core 24 of the wire 16, that is to say when the insulating sheath 25 of the wire 16 having been completely crossed by the two previously sharp edges of the part 21 of the slot 6, it is especially important not to start this metallic core 24, but on the contrary to crush it to deform it by stamping as shown in FIG. 8.

The embodiment which has just been described with reference to FIGS. 1 to 8 turns out in practice to be inconvenient when, as is often the case, a large number of wires 16 is to be connected using as many insulation displacement connectors 1.

The cableur is indeed obliged here to carry out each time the total operation of connection each wire: he must first "comb" this wire, then grasp his screwdriver, use it to make the connection, then put down this screwdriver in order to be able to repeat the operation for the next thread. He would actually much easier to be able to first "comb" all of the wires 16 in their respective self-stripping connectors 1, then to grasp his screwdriver and only then to realize, by a quarter-turn rotation of the successive barrels 4 , all of the connections without therefore having to replace the screwdriver between two insulation displacement connection operations.

Figures 9 to 14 illustrate an alternative embodiment which does not have this drawback.

• sa partie tubulaire 5 présente une autre fente longitudinale 40, qui est diamétralement opposée à la fente 8 et de même profondeur que cette dernière, mais dont le bord aval 41 (vu dans le sens de rotation du barillet 4 pour réaliser la connexion, c'est-à-dire dans le sens horaire) présente une assez brusque rampe ascendante 41 qui forme avec la verticale un angle aigu "a" de faible valeur, par exemple de l'ordre d'une dizaine à une vingtaine de degrés; et
• sa lame de coupe 10 est en conséquence placée, sur l'arète supérieure circulaire 9, légèrement en aval de cette rampe ascendante 41.

As can be seen in FIGS. 9 to 11, which correspond respectively to the preceding FIGS. 1 to 3, this self-stripping rotary connector 1 differs from the previous one by its contact member 3 which is such that:

• its tubular part 5 has another longitudinal slot 40, which is diametrically opposite to the slot 8 and of the same depth as the latter, but whose downstream edge 41 (seen in the direction of rotation of the barrel 4 to make the connection, c ' that is to say in the clockwise direction) has a fairly abrupt upward ramp 41 which forms with the vertical an acute angle "a" of small value, for example of the order of ten to twenty degrees; and
• its cutting blade 10 is consequently placed on the circular upper edge 9, slightly downstream of this ascending ramp 41.

Consequently, each wire 16 can firstly be "combed" in a stable manner (see FIG. 12) in its respective connector 1. It is then the forced rotation of the barrel 4, carried out as previously using the screwdriver 18 , which, while it causes on the one hand the self-stripping connection of the wire 16 in the slot 6 (see FIG. 13), forces on the other hand the free end 19 of this wire 16 to "go up" along of the ramp 41, and therefore to gradually straighten up to the vertical, as was similarly the case in FIG. 6.

This downstream section 19 is then, while the wire 16 is finally forced to the bottom of the slot 6 while the barrel 4 finishes its rotation by a quarter of a turn, sectioned by the cutting blade 10 whose exact position is planned accordingly (see figure 14).

The two self-stripping contactors 1 which have just been described proceed, as regards the cutting of the wire 16, by straightening, up to the vertical, of the latter against the wall 20 and by cutting the part of the straightened wire 19 by the aforementioned additional blade 10.

These achievements are advantageous. On the other hand, they require a certain precision in manufacturing to guarantee in particular the cutting effect of the wire 16 by shearing between the blade 10 and the upper face 15 of the barrel (FIGS. 7 and 14).

A less sophisticated embodiment, but simpler in manufacture, is also possible by simply providing, as shown in phantom in Figure 5, another longitudinal slot 26 on the metal tube 5, this slot 26 being practically identical to the first slot 8, that is to say shaped to receive the wire 16 simultaneously with this slot 8 and in exactly the same way, and diametrically opposite to it. The downstream end 19 of the wire 16 is then not raised upwards, and it is then the downstream longitudinal edge (clockwise) of this other slot 26 which serves as the cutting blade for the end 19 of this wire 16 during the aforementioned movement of rotation of the barrel. This third embodiment is shown in more detail in FIGS. 15 to 19.

As seen in Figures 15 to 17, which correspond respectively to Figures 1 to 3, this third embodiment differs from the first by the fact that there is provided, in the cylindrical part of the contact 3, another slot longitudinal 26 which is identical to the slot 8 and diametrically opposite the latter. Furthermore, the upper edge 9 of this contact 3 is no longer provided with the aforementioned cutting blade 10.

Note that the absence of this cutting blade 10 makes it possible to provide a collar 42 at the upper part of the barrel 4, this collar coming to rest on the upper edge 9 of the contact 3, thereby strengthening the seat of the barrel 4 in this last.

The self-stripping connection is then carried out, as shown schematically in plan view in FIGS. 18 and 19, firstly by "painting" the wire 16 in the slots 8 and 26 of the contact 3 aligned with the slot 13 of the barrel 4 (Figure 18), then turning the barrel 4 as previously by a quarter of a turn using the screwdriver 18 (Figure 19). The downstream section 19 of the wire 16 is then sectioned by the downstream longitudinal edge 43 of the slot 26 of the contact 3.

The elementary rotary contactor which has just been described is of course intended to be integrated in greater or lesser number into an assembly of the strip or other type, and in this regard Figures 20 to 25 illustrate very schematically some possible arrangements.

According to FIG. 20, an elastic metallic tab 36 equips each aforementioned metallic contact member 3 to produce, as very roughly shown, a single-face cut-off strip by interconnection of each pair of contact members 3.

According to FIG. 21, it is a single-sided strip without interruption, a metal tab 37 for connection connecting each pair of contact members 3.

In FIG. 22, a two-sided cut-off strip is produced by the association each time of two contact members 3 each having an elastic tab 36.

According to FIG. 23, a two-sided cutting strip associates each time a contact member 3 having an elastic tab 36 and a contact member 3 having none.

In FIG. 24, a two-sided strip without interruption is produced by connecting each pair of contact members 3 by a metal tab 38.

Finally, according to FIG. 25, a contact member 3, if it is provided with a very small metal tab 39 can easily be mounted, by wave soldering for example, on a printed circuit 30.

It goes without saying that the invention is not limited to the embodiment of this rotary switch which has just been described, and other variants can be envisaged without departing from the framework of this invention, such as for example embodiments for which the barrel encapsulates the tubular metallic contact member which comprises the insulation displacement slot, embodiments comprising two or more insulation displacement slots instead of just one, or embodiments not comprising cutting blade such as the blade 10 or the edge 43, the cutting of the wire 19 after the connection is then made either with the cutting pliers or with the aid of a specific tool.

Claims (11)

1. Self-stripping connection device (1) of rotary type, this device comprising, on the one hand, an at least partially cylindrical and tubular metallic contact member (3) which is maintained fixed in position and which is perforated over its tubular part (5) with at least one transverse self-stripping slot (6) with widened inlet (7), and comprising, on the other hand, a coaxial barrel (4) which is arranged in order, by a movement of rotation which is conferred thereto after introduction of the non-stripped electric wire (16) both in this barrel (4) and this tubular contact member (3, 5), to force this non-stripped wire (16) in this transverse self-stripping slot (6), characterized:

   . in that this tubular contact member (5) is slit along a generatrix so as to disengage, from its outer transverse edge (9) and at least up to the widened inlet (7) of the transverse self-stripping slot (6), a longitudinal slot (8) of sufficient width in order to allow free passage for the non-stripped electric wire (16), all along this slot (8); and

   . in that the coaxial barrel (4) presents a deep diametral groove on its outer transverse face (15), this groove (12) likewise being of sufficient width to freely receive the non-stripped wire (16) and being of such depth that its bottom (13) arrives, after assembly of the barrel (4), at the level of said widened inlet (7) of the self-stripping slot (6);

   with the result that the coaxial barrel (4) having been previously rotated to a position where this groove (12) comes into register with this longitudinal slot (8) of the contact member (3, 5) in order both to form a single deep diametral groove (12, 8), the non-stripped wire (16) may then be introduced "combed", i.e. over the connection device (1) and across with respect thereto, in this single diametral groove (12, 8) and be pushed to the bottom (13) thereof, for example with the aid of a tool (18) of the screwdriver type, the self-stripping connection then being effected conventionally, i.e. by rotating this coaxial barrel (4) to force the wire (16) in said self-stripping transverse slot (6) until the self-stripping connection of this wire (16) is thus effected.
2. Self-stripping connection device of rotary type according to Claim 1, characterized in that the tubular metallic contact member (3, 5) is provided with a cutting edge or blade (10, 43) which is positioned on this contact member (3, 5) so that this latter movement of rotation of the barrel (4) forces this same wire (16, 19) against this cutting edge or blade (10, 43) so as to cut, in this same movement which brings about self-stripping connection of the wire (16), this same wire slightly downstream of the point of connection.
3. Self-stripping connection device of rotary type according to Claim 1 or Claim 2, characterized in that the barrel (4) is inside the tubular part (5) of this metallic contact member (3).
4. Self-stripping connection device of rotary type according to one of Claims 1 to 3, characterized in that the barrel (4) is provided, on its outer transverse face (15), with another diametral groove (14) which is at right angles to the first diametral groove (12) and which is adapted to receive said tool (18) of the screwdriver type.
5. Self-stripping connection device of rotary type according to Claim 4, characterized in that this other diametral groove (14) is of depth less than that of the first (12).
6. Self-stripping connection device of rotary type according to Claim 5, characterized in that the difference (dp) in depth between these two diametral grooves (12, 14) of the barrel (4) is substantially equal to the thickness of the unstripped wire (16).
7. Self-stripping connection device of rotary type according to one of Claims 4 to 6, characterized in that, one sole longitudinal slot (8) for receiving the wire (16) being made in the tubular part (5) of the contact member (3), this tubular part (5) bears on its circular outer edge (9) a cutting blade (10) which is positioned substantially diametrally opposite the longitudinal edge (11) of this slot (8) which is the closest to the widened inlet (7) of the transverse self-stripping slot (6).
8. Self-stripping connection device of rotary type according to one of Claims 2 to 6, characterized in that the tubular part (5) of the metallic contact member (3) presents another longitudinal slot (40) for receiving the wire (16) which is diametrally opposite the first slot (8) and substantially of the same depth, the downstream edge (41) of this other slot (40), seen in the above-mentioned direction of rotation of the barrel (4), forming an ascending ramp (41) adapted to force the wire (18, 19) to straighten up substantially vertically during this rotation of the barrel, a cutting blade (10) being furthermore provided on the upper edge (9) of the metallic contact member (3) downstream of this ramp (41) so as to cut the end (19) of this wire (16) at the end of this phase of rotation of the barrel (4), i.e. at the end of the phase of self-stripping connection of the wire (16).
9. Self-stripping connection device of rotary type according to one of Claims 2 to 6, characterized in that the tubular part (5) of the metallic contact member (3) presents another longitudinal slot (26) for receiving the wire (16) which is diametrally opposite the first slot (8) and virtually identical thereto, with the result that it is the downstream longitudinal edge (43) of this other slot (26) which performs the role of blade cutting the wire (16) during the movement of rotation of the barrel (4).
10. Self-stripping connection device of rotary type according to one of Claims 1 to 9, characterized in that the widened inlet (7) of the self-stripping slot (6) is followed, widthwise of this slot, by a conical part (21) with an aperture angle smaller than that of the "V" formed by this widened inlet (7), then by a final part (22) of virtually constant width, i.e. with virtually parallel edges.
11. Self-stripping connection device of rotary type according to Claim 10, characterized in that, in thickness, the edges of this self-stripping slot (6) are sharpened, i.e. bevelled and therefore sharp, over at least the major upstream part of this conical part (21) which follows the widened inlet (7), while they are flat, and therefore not sharp, all along said final part (22) with parallel edges.

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