EP0356329B2 - Tapping assembly for a secondary cable to be connected to a main uninterrupted cable - Google Patents

Description

The subject of the present invention is a connection accessory making it possible to connect an insulated and sealed cable, a branch cable to a main cable passing by providing, at the lowest price, an insulated branch connector with non-separate derivative (s) advantages isolated bypass connector with separate derivative (s).

As is known, connectors with non-separate derivative (s) comprise, overall, two jaws, which define between them at least two channels, one for their installation on a passing main cable, the 'other for the engagement of at least one derivative cable, with, for their tightening, an assembly axis, generally unique, suitable for allowing them to be closed simultaneously on one and the other of these channels.

They have the advantage of simplicity and compactness combined with a low cost price, while being able to present, if desired, and as described for example in the French addition certificate which, deposited on July 11, 1986 under No. 86 10170, was published under No. 2.601.516, remarkable qualities of insulation.

They have, on the other hand, the disadvantage of interesting both the branched cable and the main cable, so that the disassembly of the branched cable necessarily causes them to be released from the main cable.

However, they then leave deep wounds on the main cable, especially if it is an insulated cable whose insulation had to be punctured during their installation.

It is difficult to effectively repair these injuries, even by suitably locally wrapping the damaged main cable.

Under these conditions, if the assembly and disassembly operations of a branched cable on such a main cable must be repeated, this main cable may be rapidly irreparably damaged.

This drawback is obviously not found with connectors with separate derivative (s) of the type of those, for example, described in the French patent which, deposited on June 15, 1984 under No 84 09384, was published under No. 2,566,191, to which is attached, by way of addition, the certificate of addition previously mentioned.

Indeed, and as is known, in addition to a jaw, forming a body, common to the main cable and to the branch cable, these separate branch connector (s) comprise, for this main cable and for this branch cable, separate jaws, each of which is individually associated with a particular clamping axis.

It is therefore advantageously possible to dismantle a branch cable without intervening in the tightening of the connector on the main cable.

But these connectors with separate derivative (s) are more expensive than connectors with non-separate derivative (s).

The document EP 0 009 769 describes a connection accessory for branch cable to be connected to a main cable, this connection accessory comprising a clamping assembly formed by two parts which are capable of clamping the branch cable and of which at least one is conductive, and a conductive appendage, which, provided in advance, in the workshop, is insulated and is capable of being connected to one of the jaws of an insulated connector with non-separate derivative (s), itself engaged by its other jaw with the main passing cable, with, enveloping the clamping assembly, an insulating joint, which, for the derived cable, forms a passage giving access to its conductive part.

However, in this document EP 0 009 769, the conductive part of the clamping assembly is only electrically connected to the conductive appendage, by means of a fuse, and the insulating joint is devoid of any well. likely to allow actuation of the other part of this clamping assembly.

If, therefore, this connection accessory is well suited to grounding the main conductor by means of a fuse, it is less suitable for the simple transformation of a non-separate derivative connector (s) ) in a separate derivative connector (s).

The present invention relates to a connection accessory allowing such a transformation.

The connection accessory or module according to the invention is generally characterized in that, comprising, in the manner of a connector, a clamping assembly formed of two parts, which are capable of clamping together , like jaws, a derived cable, and at least one of which is conductive, said conductive part is equipped in advance, in the workshop, with an insulated conductive appendage which is integral both mechanically and electrically, and which is capable of being connected to one of the jaws of an insulated connector with non-separate derivative (s), itself engaged by its other jaw with a passing main cable, in that said conductive appendage consists of a section of bar in one piece with this conductive part, in that said clamping assembly is wrapped in an insulating joint which, for the derived cable, forms a passage giving access to its conductive part, and which, to allow actuation of e its other part, has a well to the right of it, and in that said insulating joint extends continuously over the section of bar constituting the conductive appendage, forming for it a dead-end pocket , so that it constitutes a sealed insulated connection accessory.

Thus, once the branch cable is engaged with the connection accessory according to the invention, the latter is itself engaged, by its conductive appendage, with the branch connector (s) not separated (s) engaged on the main cable.

This derivative connector (s) not separated (s) can therefore remain permanently on the main cable, any mounting and dismounting of a derivative cable only concerning the connection accessory according to the invention.

Everything therefore happens as if the assembly which constitutes this connection accessory and this non-separate derivative connector (s) jointly formed a separate derivative connector (s).

• la figure 1 est, en trait plein, et avec un arrachement local, une vue en perspective éclatée d'un accessoire de branchement suivant l'invention, et, en traits interrompus, une vue en perspective des éléments avec lesquels il est susceptible de coopérer ;
• la figure 2 en est une vue en coupe axiale, suivant la ligne II-II de la figure 1 ;
• les figures 3 et 4 en sont des vues en coupe transversale, suivant, chacune respectivement, les lignes III-III et IV-IV de la figure 2 ;
• la figure 5 en est, avec un arrachement local, une vue de dessus, suivant la flèche V de la figure 2,
• la figure 6 est une vue en perspective de l'appendice conducteur que comporte l'accessoire de branchement suivant l'invention et de la pièce de serrage dont est solidaire cet appendice conducteur, représentés isolément ;
• la figure 7 est, à échelle inférieure, une vue en coupe axiale analogue à celle de la figure 2, pour une variante de réalisation ;
• la figure 8 est une vue en perspective analogue à celle de la figure 6, pour cette variante de réalisation ;
• la figure 9 est, à l'échelle de la figure 7, une vue partielle en coupe axiale qui, elle aussi analogue à celle de la figure 2, se rapporte à une autre variante de réalisation ;
• la figure 10 est, de même, mais à échelle supérieure, une vue partielle en coupe axiale qui, analogue à celle de la figure 2, se rapporte à une autre variante de réalisation ;
• la figure 11 est une autre vue en coupe axiale de cette dernière variante de réalisation, suivant la ligne XI-XI de la figure 10 ;
• la figure 12 est une vue en coupe axiale analogue à celle de la figure 10, pour une autre variante de réalisation ;
• la figure 13 est, à échelle différente, une vue en coupe axiale analogue à celle de la figure 2, pour une autre variante de réalisation de l'accessoire de branchement suivant l'invention ;
• la figure 14 est une vue en coupe axiale analogue à celle de la figure 2 concernant une variante de réalisation ;
• la figure 15 est une vue en coupe transversale de cette variante de réalisation suivant la ligne XV-XV de la figure 14.

The characteristics and advantages of the invention will become apparent from the description which follows, by way of example, with reference to the appended schematic drawings in which:

• Figure 1 is a solid line, with a cutaway, an exploded perspective view of a connection accessory according to the invention, and, in dashed lines, a perspective view of the elements with which it is likely to cooperate ;
• Figure 2 is an axial sectional view along the line II-II of Figure 1;
• Figures 3 and 4 are cross-sectional views along each, respectively, lines III-III and IV-IV of Figure 2;
• FIG. 5 is, with a local cutaway, a top view, along arrow V of FIG. 2,
• Figure 6 is a perspective view of the conductive appendage that includes the connection accessory according to the invention and the clamping part which is integral with this conductive appendage, shown in isolation;
• Figure 7 is, on a smaller scale, an axial sectional view similar to that of Figure 2, for an alternative embodiment;
• Figure 8 is a perspective view similar to that of Figure 6, for this alternative embodiment;
• Figure 9 is, on the scale of Figure 7, a partial view in axial section which, also similar to that of Figure 2, relates to another alternative embodiment;
• Figure 10 is, similarly, but on a larger scale, a partial view in axial section which, similar to that of Figure 2, relates to another alternative embodiment;
• Figure 11 is another view in axial section of this latter embodiment, along the line XI-XI of Figure 10;
• Figure 12 is an axial sectional view similar to that of Figure 10, for another alternative embodiment;
• Figure 13 is, on a different scale, an axial sectional view similar to that of Figure 2, for another alternative embodiment of the connection accessory according to the invention;
• Figure 14 is an axial sectional view similar to that of Figure 2 relating to an alternative embodiment;
• FIG. 15 is a cross-sectional view of this alternative embodiment along the line XV-XV of FIG. 14.

As illustrated in broken lines in Figures 1 and 5, it is, overall, to ensure the connection, to a passing cable 10A, or main cable, any other cable 10B, or branch cable.

In the embodiment shown, the main cable 10A and the branch cable 10B are both insulated cables, that is to say cables comprising, around a conductive core 12A, 12B , a sheath of insulating material 13A, 13B.

According to the invention, the connection, to the main cable 10A, of the branched cable 10B, is made via, on the one hand, a connector to non-separate branch (es) 14, of type known in itself, and preferably of the isolated type, and, on the other hand, of a connection accessory 15.

Since the non-separate derivative connector 14 does not fall under the present invention, it will not be described in all its details here.

It will suffice to indicate that, in a manner known per se, it comprises two jaws 16, 16 'which define between them two channels 17A, 17B, each suitable for receiving any cable or any other conductive member of this type, and which , for their tightening, are jointly subjected to an assembly axis 18, here unique.

Through its channel 17A, the non-separated derivative conductor (s) 14 thus formed is adapted to be engaged on the main cable 10A.

By its channel 17B, it is normally adapted to receive the branch cable 10B.

According to the invention, the connection accessory 15 is substituted for the latter, by interposing between it and the derivative connector (s) not separate (s) 14.

In general, and as is better visible in FIGS. 2 and 3, the connection accessory 15 according to the invention comprises, in the manner of a connector, a clamping assembly 20, formed of two parts 21, 21 ', which are capable of clamping any cable between them, for example the branch cable 10B, and of which at least one, in this case the part 21, is conductive, and the said conductive part 21 is equipped by advance, in the workshop, of a sealed, conductive appendage 22, which is integral both mechanically and electrically, and which is capable of being connected to the assembly constituted by the main cable 10A and the connector to derivative (s) not separate (s) 14 engaged therewith.

In the embodiment more particularly shown in Figures 1 to 6, the conductive part 21 of the clamping assembly 20 is constituted by a jaw abutted by a cage 23, which defines with it a channel 17'B adapted to receive the derivative cable 10B, and with which the other part, part 21 ', is in screw connection, by transversely cutting this channel 17'B.

For example, and as shown, the cage 23 is a section of hollow profile, the cross section of which is generally rectangular, while having widely rounded angles.

At the same time, the jaw constituting the conductive part 21 forms, internally, on the side of the channel 17'B, a cradle, which extends axially, and the surface of which is bristling with ridges or teeth 25.

In the embodiment shown in Figures 1 to 6, these are streaks which extend transversely.

Externally, the jaw constituting the conductive part 21 has a section complementary to that of the cage 23 which abuts it, and, for its retention, the latter has, internally, opposite one another, two recesses 26.

In the embodiment shown in FIGS. 1 to 6, the conductive appendage 22 with which the conductive part 21 is thus formed is constituted by a cylindrical bar section of circular section, in one piece with this conductive part 21.

The assembly is for example made of aluminum alloy.

The same is true for cage 23.

At the same time, the other part of the clamping assembly 20, in this case the part 21 ', comprises a clamping screw 27 with a threaded barrel 28 and a screwing head 29.

By its threaded barrel 28 this clamping screw is engaged with the cage 23, on the side of the latter opposite the jaw constituting the conductive part 21, this cage 23 having for this purpose, in line with the median zone of this jaw , a tapped hole 30.

In the embodiment shown, the part 21 ′ further comprises, in the cage 23, parallel to the jaw constituting the conductive part 21, a jaw 32, freely rotatably mounted at the end of the clamping screw 27.

For example, and as shown, this jaw 32 is engaged on an extension 33, duly crimped at its end, of the threaded barrel 28 of the clamping screw 27.

Like the jaw constituting the conductive part 21, it extends axially, and it has ridges or teeth.

In the embodiment shown, these are teeth 34 ', which, two in number, extend longitudinally.

As shown, the clamping assembly 20 is wrapped in an insulating seal 36, made of durably deformable elastic material, which, for the derived cable 10B, forms a passage 37 giving access to its conductive part 21, and which, to allow the 'actuation of his other part 21', has a well 38 to the right thereof.

In practice, the passage 37 extends, in a cylinder, in line with the cross section of the cage 23 of the clamping assembly 20, on the side of the latter opposite the conductive appendage 22, and, internally, it has, projecting, substantially at mid-distance, an elastically and durably deformable lip 39, which, generally frustoconical, extending in the direction of the cage 23, restricts its opening.

On the other side of the cage 23 of the clamping assembly 20 relative to the passage 37 thus formed, and, therefore, on the side of the conductive appendage 22, the wall of the insulating seal 36 is preferably reinforced, while providing a clearance 40 above the corresponding end of the conductive part 21.

By its wall thus reinforced, and by the passage 37 which it forms, the insulating seal 36 is duly wedged axially on the cage 23.

In practice, it is formed of two distinct parts 36A, 36B, the first comprising its reinforced wall and the well 38 and surrounding the cage 23, and the second comprising the passage 37 while being abutted to this cage 23 and joining the previous one at its end.

The well 38 which it presents extends laterally with respect to the cage 23, around the threaded bore 30 thereof, and, in contact with this cage 23, it has a bottom 41 duly perforated for the passage of the threaded barrel 28 of the clamping screw 27.

Preferably, and as shown, the insulating seal 36 extends continuously over the bar section constituting the conductive appendage 22.

In practice, by its part 36A, it forms for the latter a cul-de-sac pocket 42 which is exactly adjusted to it.

It follows from the above that the connection accessory 15 according to the invention constitutes an isolated and sealed connection accessory.

The insulating seal 36 which it comprises is made of durably deformable elastic material, and, as shown, it is disposed, in practice, under elastic stress, in a housing 44, which is formed of two shells of hard insulating material 45A, 45B suitably secured to each other, and which has, on the one hand, an opening 46B leaving free access to the passage 37 formed for the insulated cable 10B the insulating joint 36, and, on the other hand, a chimney 48 surrounding the well 38 of the latter.

In practice, the joint plane between the shells 45A, 45B of this housing 44 extends transversely relative to the cage 23 of the clamping assembly 20, along the axis of the clamping screw 27, so that these shells 45A, 45B each half form the chimney 48, and that the opening 46B of the assembly belongs to the shell 45B.

Jointly, the shell 45A has, in correspondence with the opening 46B, an opening 46A through which extends, outwards, the conductive appendage 22 sheathed in the pocket 42 formed for it by the insulating seal 36 .

In the embodiment shown, the two shells 45A, 45B of the housing 44 thus formed are secured to one another by simple snap-fastening.

To this end, each of them has, in correspondence, along their confrontation edge, on the one hand, on one side, an ear 47A, 47B, and, on the other hand, on the opposite side, a tab 48A, 48B suitable for hooking on the opposite ear 47B, 47A.

Anyway, by transverse shoulders 49A, 49B, they press against the edges of the cage 23 of the clamping assembly 20, the corresponding parts 36A, 36B of the insulating seal 36.

Preferably, and as shown, the clamping screw 27 is integral with a skirt 50 which surrounds the chimney 48 of the housing 44.

In practice, this skirt 50 belongs to a cap 51, which, internally, has a central core 52, by which it is engaged with the head 29 of the clamping screw 27, and which, for the rotation control of the together it thus constitutes with this clamping screw 27, presents, externally, an axial boss 53 forming a nut.

Preferably, the outer wall of the central core 52 of this cap 51 has a cross section which decreases slightly in the direction of the cage 23 of the clamping assembly 20, so that, engaged in the well 38 of the insulating seal 36 , this central core 52, thus frustoconical, is capable of pressing this well 38 against the chimney 48 of the housing 44 which surrounds it, even though this chimney 48 is itself buttressed, externally, by the corresponding skirt 50.

As a variant of the previous arrangement, FIGS. 14 and 15, the head 29 of the clamping screw 27 which is generally hexagonal, is equipped with a nozzle 150, made of hard insulating material, secured to this head 29 by fitting and gluing, and this end piece 150 essentially comprises, at its upper part, a gripping gripping head 151, preferably hexagonal, surmounting a lower unscrewing part 152 which is also hexagonal and of the same dimensions as the head 151, being separated from the latter by a calibrated rupture groove 153 and, at its lower part, a base 154, which externally is generally cylindrical while nevertheless presenting a slight conical relief of increasing diameter from its lower end towards its upper end and is thus suitable for engaging sealingly in rotation and translation in the well 38 of the insulating seal 36 externally buttressed by the chimney 48 of the housing 4 4 which surrounds it, and which internally comprises a hexagonal housing 155 cooperating in securing the screwing or unscrewing with the head 29 of the clamping screw 27.

By its calibrated rupture groove 153, the end piece 150 constitutes what is known as a "fusible" end piece.

After rupture of this groove 153, its hexagonal part 152 can be used for the possible unscrewing of the clamping screw 27.

In the embodiment shown, the gripping head 151 in clamping of this fusible end piece 150, internally comprises a cylindrical relief cavity 160 of diameter slightly larger than that of a cylindrical relief cavity 161 which jointly comprises the hexagonal part 152 underlying, the recess between these lightening cavities 160 and 161 being situated at the level of the tared rupture groove 153 so as to obtain a frank and precise rupture for a predetermined tightening torque.

In addition, its gripping gripping head 151 has, on its angles and at its lower part, in a manner known per se, retainers 163, FIG. 15, intended to prevent, during tightening in screwing, the engagement of the key. tightening on the lower hexagonal part 152.

For the implementation of the connection accessory 15 according to the invention, the conductive appendage 22 of this connection accessory 15, sheathed by the pocket 42 of its insulating seal 36, is engaged between the jaws 16, 16 'of the driver 14.

This engagement can be done in conjunction with the engagement of this connector 14 on the main cable 10A, before, under the action of the assembly pin 18, the jaws 16, 16 'of the latter close simultaneously, or almost simultaneously, on this main cable 10A and on the conductive appendage 22 of this connection accessory 15.

But, if, arrangements being made for this purpose, the jaws 16, 16 'of the connector 14 can, at least momentarily, be kept sufficiently open on the side by which they are intended to be engaged on the main cable 10A, the accessory connection 15 can be brought in advance, by its conductive appendage 22, with the two jaws 16, 16 'of this connector 14, which facilitates the subsequent positioning thereof on the main cable 10A.

In such a case, the connection accessory 15 according to the invention advantageously constitutes, with the connector 14, an assembly capable of being marketed and handled as such.

In all cases, it is sufficient, for the connection of the branch cable 10B to the main cable 10A, when, duly equipped with a connection accessory 15 according to the invention, a connector 14 is engaged with this main cable 10A, engage, in the passage 37 of the insulating seal 36 of this connection accessory 15, the end, previously stripped, of the conductive core 12B of this branch cable 10B, until, elastically crossing the elastically deformable lip 39 of this passage 37, this stripped end enters the cage 23 of the clamping assembly 20 by engaging in the corresponding channel 17'B, then screwing, by the cap 51, the clamping screw 27, until that the jaw 32 which the latter carries comes to energetically press this stripped end against the jaw forming the conductive part 21.

Given the insulating seal 36, and, in particular, its elastically deformable lip 39 as well as its well 38 clamped between the cap 51 and the housing 44, the sealing is absolute, and the disassembly of the branch cable 10B is possible without that there is anything necessary to intervene on the main cable 10A.

In the variant embodiment shown in FIGS. 7 and 8, the part 21 ′ of the clamping assembly 20 is reduced to the single clamping screw 27.

In addition, in this variant embodiment, the jaw constituting the conductive part 21 is provided with teeth 34 which extend longitudinally.

In the variant embodiments shown in FIGS. 9 to 12, the conductive appendage 22 with which the conductive part 21 of the clamping assembly is equipped is formed by a section of cable insulated on the stripped end of the conductive core 55 of which this conductive part 21 is crimped in the workshop.

At its other end, this insulated cable section is provided, in a manner known per se, with a flexible cap 56, possibly filled with grease, in order to prevent the penetration of moisture therein.

As a corollary, the insulating joint 36 has, for the outlet of the insulated cable section thus constituting the insulated conductive appendage 22, a passage 57 and, by the latter, it surrounds the insulating sheath 58 of this insulated cable section.

As will be understood, it is, in fact the conductive core 55 of this insulated cable section which strictly forms the conductive appendage according to the invention, while its insulating sheath 58 and the plug 56 form the equivalent of the previous dead end pocket of the insulating seal 36.

In addition, in the variant embodiment shown in FIGS. 10 and 11, the conductive part 21 of the clamping assembly 20 is constituted by a body, which has a bore 17 "B able to receive the branch cable 10B, and, more precisely, the end, previously stripped, of the conductive core 12B thereof, and with which is engaged, by screwing, the other part 21 'of this clamping assembly 20, by transversely cutting this bore 17 "B.

As before, this other part 21 ′ is reduced, in the embodiment shown, to a clamping screw 27.

Furthermore, in the embodiment shown in these Figures 10 and 11, the shells 45A, 45B of the housing 44 are provided, at their opening 46A, 46B, with a fallen edge 61A, 61B, which defines this opening 46A , 46B, and which directly forms the shoulder 49A, 49B by which this housing 44 crosses, transversely, the corresponding part 36A, 36B of the insulating seal 36 which it surrounds.

In addition, in this embodiment, and it is moreover the same in the embodiments shown in FIGS. 7 to 9, the skirt 50 of the cap 51 secured to the clamping screw 27 is snapped on, by means axial retention, on the chimney 48 of the housing 44.

To do this, this chimney 48 has, radially outward, a bead 64, and, jointly, the skirt 50 of the cap 51 has radially inward, a bead 65 in the form of a hook.

For the rest, the provisions are of the type described above.

However, the opening delimited by the elastically deformable lip 39 of the insulating seal 36 is initially obscured therein by a knockout cover 66.

In the foregoing, the conductive part 21 of the clamping assembly 20 is only able to receive a single branch cable 10B, or, more precisely, a single range of branch cables 10B.

As a variant, in FIG. 12, it may be able to receive, in parallel, at least two branch cables 10B, and, more precisely, two ranges of branch cables 10B.

In FIG. 12, this arrangement has been applied to the variant embodiment described with reference to FIGS. 10 and 11, the body then constituting the conductive part 21 of the clamping assembly 20 comprising, to do this, in parallel, two bores 17 "B, possibly with different diameters.

But it goes without saying that it can just as easily be applied to any of the other preceding embodiments.

According to the arrangement illustrated in FIG. 13, the conductive appendage 22 with which the conductive part 21 of the clamping assembly 20 is fitted with a connection accessory 15 according to the invention is in common between two such connection accessories 15 , by engaging with the conductive part 21 of a first of these connection accessories 15 at one of its ends and with the second to the other of these.

In FIG. 13, this arrangement has been applied to an embodiment of the type described with reference to FIG. 7.

But, as before, it goes without saying that it can just as easily apply to any of the other embodiments.

The present invention is moreover not limited to the embodiments described and shown, but encompasses any variant embodiment and / or combination of their various elements.

In particular, if, in the embodiments described and shown, it is always a fixed part of the clamping assembly which is provided with an insulated conductive appendage, or that, duly wedged thereon, this part is buttressed by a cage, either that it forms by itself a fixed body, it is obvious that it would not go beyond the scope of the present invention by providing this conductive appendage with the other part of this clamping assembly, it that is, the one that is movable relative to the previous one, even if, from a practical point of view, the embodiments described and shown appear preferable.

Claims (18)

1. A connection accessory for an insulated cable, known as a secondary cable (10B), for connection to a main insulated passing cable (10A), characterised in that it comprises, in the form of a connector, a clamping assembly (20) formed by two pieces (21), (21') which are capable of clamping said secondary cable (10B) between them, and at least one of which is conductive, said conductive piece (21) being provided beforehand in the workshop with an insulated conductor attachment portion (22) which is integral both mechanically and electrically with the conductive piece and which is capable of being connected to one of the clamps (17B) of an insulated connector with non-separated by-pass(es) (14), itself engaging by way of its other clamp (17A) with the main passing cable (10A), in that said conductor attachment portion (22) is constituted by a bar portion which is integral with the conductor piece (21), in that said clamping assembly (20) is encased by an insulating seam (36), which, for the secondary cable (10B), forms a passage (37) opening into its conductor piece (21), and which, to allow actuation of its other piece (21') has a recess (38) at right angles to the other piece, and in that said insulating seam (36) extends continuously over the bar portion constituting the conductor attachment portion, forming a blind pocket (42) for it, in such a way that it forms a sealed insulated connection accessory.
2. A connection accessory according to Claim 1, characterised in that the insulating seam (36) encasing the clamping assembly (20) is made of an elastic material and is disposed under pressure in a casing (44) formed by two shell-shaped members (45A, 45B) made of a hard insulating material suitably bearing upon one another, and which has an opening (46B) allowing free access to the passage (37) provided for the secondary cable (10B) on this insulating seam (36) and a shaft (48) enclosing the recess (38) of this latter.
3. A connection accessory according to any one of Claims 1, 2, characterised in that the insulating seam (36) encasing the clamping assembly (20) is formed by two portions (36A, 36B), the first forming the recess (38) and the second forming the passage (37) and forming a seam with the end of the first piece.
4. A connection accessory according to any one of Claims 1 to 3, characterised in that the passage (37) of the insulating seam (36) encasing the clamping assembly (20) extends cylindrically, and, inside, it has a projecting, elastically deformable lip (39) which is substantially frustoconical and restricts the opening.
5. A connection accessory according to Claim 4, characterised in that the opening which is delimited by the elastically deformable lip (39) of the insulating seam (36) is closed by a collapsible lid (66).
6. A connection accessory according to any one of Claims 1 to 5, characterised in that the conductor piece (21) of the clamping assembly (20) is constituted by a clamp against which bears a frame (23) which defines therewith a channel (17'B) capable of receiving the secondary cable (10B), and with which the other piece (21') is in screwed engagement, intersecting said channel (17'B) transversely.
7. A connection accessory according to Claims 3 and 6 taken conjointly, characterised in that the portion (36A) forming the recess (38) of the insulating seam (36) encloses the frame (23) of the clamping assembly (20), and its portion (36B) is joined end to end with this frame (23).
8. A connection accessory according to any one of Claims 1 to 7, characterised in that the conductor piece (21) of the clamping assembly (20) is constituted by a body which has a bore (17"B) capable of receiving the secondary cable (10B), and with which the other piece (21') is screwingly engaged, intersecting said bore (17"B) transversely.
9. A connection accessory according to any one of Claims 1 to 8, characterised in that the conductor piece (21) of the clamping assembly (20) is capable of receiving at least two secondary cables (10B) in parallel relationship.
10. A connection accessory according to any one of Claims 1 to 9, characterised in that the conductor attachment portion (22) provided on the conductor piece (21) of the clamping assembly (20) is common to two connection accessories (15), being engaged with the conductor piece (21) of a first one of these connection accessories (15) at one of its ends and with the second at the other end.
11. A connection accessory according to any one of Claims 1 to 10, characterised in that the conductor piece (21) provided in the clamping assembly (20) forms a cradle, the surface of which is covered with transversely extending furrows or teeth (25).
12. A connection accessory according to any one of Claims 1 to 11, characterised in that the conductor piece (21) provided in the clamping assembly (20) is provided with longitudinally extending teeth (34).
13. A connection accessory according to any one of Claims 1 to 12, characterised in that the other piece (21') of the clamping assembly (20) comprises a tightening screw (27).
14. A connection accessory according to Claim 13, characterised in that the other piece (21') of the clamping assembly (20) additionally comprises a clamp (32) which is mounted freely to rotate at the end of the tightening screw (27).
15. A connection accessory according to Claims 2 and 13 taken conjointly, characterised in that the tightening screw (27) is integral with a skirt (50) which encloses the shaft (48) of the casing (44) and with a frustoconical core (52), which, being engaged in the recess (38) of the insulating seam (36), is capable of pressing this latter against the shaft (48).
16. A connection accessory according to Claim 15, characterised in that by virtue of axial retaining means, the skirt (50) which is integral with the tightening screw (27) is clipped over the shaft (48) of the casing (44).
17. A connection accessory according to any one of Claims 15, 16, characterised in that the skirt (50) with which the tightening screw (27) is integrally formed is associated with a cap (51), which, having the central core (52), engages by virtue of it with the head (29) of said tightening screw (27), and which, to control rotational movement of the assembly, has on the outside an axial boss (53) which forms a screw nut.
18. A connection accessory according to Claims 2 and 13 taken conjointly, characterised in that by way of a variant of Claims 15, 16, 17, the head (29) of the tightening screw (27) is provided with a tip made of insulating material (150) which comprises at the upper part thereof a clamping gripping head (151) which is separated from a lower unscrewing portion (152) by a calibrated breakage groove (153), and, at its lower part, has a cylindrical base (154) capable of engaging sealingly for rotational and translatory movement in the recess (38) of the insulating seam (36).

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