FR2463984A3 - Ring junction for heavy cables - has two-part shell, screw for cutting conductor insulation and flexible star shaped spacer - Google Patents

Abstract

The junction allows power take-off from three phase cables etc. without breaking the conductors. The junction element forms an annulus around the cable and cuts through the individual conductor insulation to make connection to the incoming cables. The junction shell is in two snap fitting halves (1,2) with openings at ninety degrees around its perimeter for four junction cable inputs (7,8,9) and connection points. Connection to each of the supply conductors (22) is by a screw (10) within a trapped threaded section (15) which is held in position by a sprung washer (14). The screw has a slotted end face (34) and a raised perimeter in order to cut the cable insulation. The conductors are held apart by a flexible star shaped spacer (26) such that differing weight conductors can be accommodated.

Description

The invention relates to a ferrule branch terminal for multi-conductor cable, comprising several contact elements for connecting the branch conductors, and milling screws for piercing the insulations of the conductors of the cabal.

 A target ferrule bypass terminal of this type is known from French Patent 1,543,810 which describes a device for a target with phase conductors made in the same way, the ends of the milling screws being made in the same manner.

 However, there are conductive targets in which the conductors are not formed in the same way, in particular targets with several phase conductors and a neutral, the neutral may have another shape in section, another diameter and may be constituted other material. When the known ferrule bypass terminal is mounted on such a target, one obtains, due to the similar constitution of the screws to be milled, different contact conditions for the conductors formed differently.

 It is therefore an object of the present invention to provide a target ferrule bypass terminal of the type described above, which can be mounted on cables with several conductors comprising conductors of different shapes and sizes.

 According to the invention, this object is achieved thanks to the fact that the anterior ends of the milling screws are formed differently.

 In particular, the front faces of the milling screws have a raised edge for the phase conductors and the threads of the milling screws end slightly before these front faces. Thanks to this constitution, a cutting edge is formed at the edge of the front face of the milling screw which ensures, during milling, a fixing between the milling screw and the conductor, the insulation of which must be pierced, so that the conductor and its insulation cannot escape laterally. Because the thread does not reach the front face of the milling screw, the cutting edge extends peripherally, without interruption through part of the thread.

 In the target ferrule bypass terminal according to the invention, the milling screw, which cooperates with the neutral, advantageously has, with little -istance in front of the front face, a stop collar. Thanks to this, it is obtained that the milling wash can only penetrate a short part into the neutral, which is particularly advantageous when the neutral is surrounded by a coating of soft material, such as lead.

 The invention will be clearly understood on reading the description which follows of an embodiment and in view of the single figure of the drawing which represents a partially sectional front view of a branch terminal with ferrule for cable according to the 'invention.

The ferrule bypass terminal for key, consisting of 2 parts 1 and 2 plugged together, includes contact elements 3, 4, 5 and 6 which, on one side, have holes 7, 8 and 9 for introduction branch conductors and in which, on the other hand, are provided milling screws 10, 11, 12 and 13 and, more precisely, in an internally threaded part 15, subjected to the pressure of washers
Belleville 14. The milling screws are provided at their anterior end with milling grooves 16, 17, 18 and 19. The target ferrule bypass terminal surrounds the multi-conductor target comprising the phase conductors 20, 21 and 22 and neutral 23, which are each surrounded by insulation. Between the conductors, and for keeping at a distance, are arranged pieces of insulation 24, 25, 26 and 27, in the form of wedges, which are shaped differently and which take different angles when assembled, this is that is to say in particular which define a smaller angle around the neutral 23 than around the phase conductors 20, 21 and 22.

 the milling screws 10, 11 and 12 for the phase conductors have, at their anterior end, a part 28, 29 and 30 without threads, and their front surface has intermediate surfaces 31, 32 and 33 shifted inwards, which form raised edges 34, 35 and 36 and thus peripheral edges.

 the milling screw 13 for the neutral presents at short distance, in front of its front face, a stop collar 37.

Claims (3)

REVENDI CÂTIONS  1. Ferrule branch terminal for multi-conductor cable, comprising several contact elements which are used to connect the branch conductors, and milling screws for piercing the insulation of the conductors of the saddle, characterized in that the front end milling screws (10, 11, 12 and 13) is shaped differently from each other.  2. branch terminal according to claim 1, characterized in that the front face of the milling screws (10, il, 12) for the phase conductors (20, 21, 22) has a raised edge (34, 35, 36 ), and in that the threading of the milling screws ends slightly in front of their front surface (28, 29, 30).  3 Bypass terminal according to claim 1 or claim 2, characterized in that the milling screw (13) for the neutral (23) has, slightly before its front face, a collar (37) stop.