FR2524722A1 - Terminating device with bend section for flexible coaxial cable - has threaded sleeve with ferrule which connects with outer conductor braid in crimping join - Google Patents

Abstract

The design described is a device for terminating co-acial cables in a female socket which is equipped with a ferrule which anchors the outer conducting braid to the socket chassis. A bend section can be formed either be first threading the cable through a pre-formed bend section, or by introducing the bend afterwards. The outer conductor is anchored to the ferrule by means of crimping. The crimping ring can either be the end of the bend section tube or, if the bend is made of a plastics material, a metal ring attached to one end. The ferrule is integral with a threaded disc which is screwed along an internal thread of the socket sleeve. The screwing action forces the ferrule head against the shoulder, of the sleeve (12) which draws the socket head onto the end of the cable bend.

Description

Device for bending a coaxial flexible cable
The present invention relates to a device for bending a flexible coaxial cable connected to a plug by a nut. connection of said cable comprising a central conductor, an insulating sheath, an outer conductor and possibly an outer insulating layer.

 When the accessibility of a connection is satisfactory, it is known to connect a straight coaxial cable to a plug via a ferrule tightened in the cable by crimping and a nut screwed onto the plug.

 But in a set of devices, the space available, sometimes very limited, does not allow the use of such connectors.

 It is therefore necessary to use bent connectors.

 Elbow fittings, currently known form a right angle and mechanically reconstruct the cable. This mechanical reconstruction leads to a discontinuity in sections or proportions and thus modifies the electrical performance of the cable.

 The present invention overcomes this drawback by providing a bending device which retains the electrical qualities of the cable by carrying it as close as possible to the connection nut.

 The bending device according to the invention is characterized in that it comprises a ferrule inserted between the insulating sheath and the external conductor, anchored to the nut by a head, crimping means for immobilizing the ferrule in the cable, a bent sleeve covering the cable up to the level of the nut.

 Advantageously, the sleeve is pre-bent.

 According to another characteristic, the sleeve is bent after the cable has been connected.

 Preferably the sleeve is metallic and the crimping means is the end of the sleeve.

 According to another characteristic, the sleeve is made of plastic and the crimping means is a metal ring surrounding the end of the cable.

 This device has other advantages such as, for example, a reduced cost, a simplicity of implementation, a great latitude as to the possible dimensions and angles, a certain robustness and reliability.

 It is described below, by way of example, and with reference to the figures of the appended drawing, a bending device with metal sleeve and a bending device with plastic sleeve, of a coaxial cable comprising a braided outer conductor coated with '' an insulating outer sheath.

 Figures 1, 2, 3 show a metal sleeve connection device.

 Figure 1 shows in exploded view, the device and the constitution of the cable.

 FIG. 2 represents, in section, the device once the crimping of the sleeve has been carried out.

 Figure 3 shows in section along III the crimping of the sleeve.

 Figures 4, 5, 6 show a connection device with plastic sleeve.

 Figure 4 shows, in section the device before crimping.

 Figure 5, in section along V, the metal ring before crimping.

 Figure 6 shows in perspective, the mounting of the plastic sleeve once the crimping of the ring has been carried out.

 In FIG. 7, the device comprises a cable 1 provided with a central conductor 2, an insulating layer 3 with a braided outer conductor 4 and an outer sheath 5, a nut 6, a ferrule 7 and a metal sleeve 10.

 The end of the cable 1 is stripped and therefore has a length of exposed central conductor and a length of insulating layer also exposed.

 In Figure 2, the device is mounted and then permanently crimped. The length of the exposed central conductor enters a plug (not shown) and the length of exposed insulating layer isolates the central conductor 2 from the ferrule 7. This ferrule provides electrical continuity between the braided outer conductor 4 and the nut 6 .

 This nut has an internal thread 11 allowing it to be screwed onto the plug, and a shoulder 12 for pulling the ferrule 7 in the direction of the plug. This ferrule made of good conductive metal is screwed, before mounting the device at the end of the cable, in the thread 11 of the nut 6 by means of an external thread 8 and this in order to make it trapped in the nut.

 The head of this ferrule abuts on the shoulder 11, and its grooved cylindrical part 9 is inserted between the insulating sheath 3 and the outer conductor 4 of the cable 1. A bent metal sleeve 10 completely covers the end of the cable until 'at the nut.

A crimp 13 of the sleeve 10 visible in Figure 3 effectively maintains the ferrule inside the cable.

 In Figure 4 the end of the cable 1 of this device receives a nut 6 and a ferrule 7 identical to the device of the previous figures.

 A metal ring 19 covers the end of the cable up to the level of the nut 6.

 Figure 5 shows in section along V, the initial shape of this ring.

 In Figure 6 the crimping of the ring 19 is performed.

 It has a hexagonal shape allowing the fitting of the plastic sleeve 20.

 Without departing from the scope of the invention, the insulating outer sheath covering the braided outer conductor can be eliminated; the sleeve can obviously be bent before or after crimping at any angle, or be made of another material, in particular heat-shrinkable, possibly in two half-shells; the cable can be provided with an outer strip conductor which is not welded but covered with an insulating outer sheath.

Claims (5)

1 / Device for bending a coaxial flexible cable (1) connected to a plug by a connection nut (6) said cable comprising a central conductor (2) an insulating sheath (3) an external conductor (4), device characterized in that it comprises a ferrule (7) inserted between the insulating sheath and the external conductor, anchored to the nut (6) by a head, crimping means for immobilizing the ferrule in the cable, a bent sleeve (10 ) covering the cable up to the level of the nut. 2 / bending device according to claim 1, characterized in that the sleeve is pre-bent. 3 / bending device according to claim 1, characterized in that the sleeve is bent after the cable connection. 4 / bending device according to claim 1, characterized in that the sleeve (10) is metallic and the crimping means is the end of the sleeve. 5 / bending device according to claim 1, characterized in that the sleeve (20) is plastic and the crimping means is a metal ring (19) surrounding the end of the cable.