FR2775836A1 - Conducting cable-retaining collar for electrical apparatus connector - Google Patents

Abstract

The cable (4) is fastened to an electrical connector (2) by a retaining strap (6) of a supple synthetic material which is electrically conducting thanks to a metal coating made from a Cu, Sn, Pb alloy or by incorporating uniformly distributed conducting particles. The strap is fastened by inserting its tongue (14) through a buckle (12) and tightening it.

Description

CABLE SHIELD RECOVERY DEVICE

ELECTRIC

  The present invention relates to a shield recovery device for a cable intended to be connected to a connector fitted to an electrical device such as a data transmission device for example. The invention also relates to a connector

comprising such a device.

  Electrical devices and especially data transmission devices are subject to standards relating to Electromagnetic Compatibility (EMC) which impose effective shielding of the cables connected to the connectors fitted to these devices. The effectiveness of this shielding depends on the quality of recovery of the braid (or strip) of said cables. The techniques used in the prior art to achieve this aim consist in ensuring a resumption of shielding around the cable by a short and wide connection by means of conductive elements such as metal collars, crimp rings or screw jumpers. In addition to the fact that they require specific tools for their installation, these elements are difficult to mount on the connectors, due to their rigidity, more particularly when

  these are small.

  Also, due to their rigidity, they conform more or less to the shape of the cable and of the connector, which has the effect of causing a loss of efficiency.

a very significant alignment.

  The object of the invention is to overcome them

  disadvantages of the prior art described above.

  According to the invention, the shielding recovery device is constituted by a collar of material

  flexible synthetic electrically conductive.

  Such a collar is able to follow the shape of the cable and of the connector, thus ensuring a conductive connection up to 360. This notably improves the efficiency of the resumption of shielding compared to the devices of the prior art. In addition, no special tools are required to install this collar. According to a first version of the invention, the] 5 shield recovery collar is made of material

metallized polyamide.

  Preferably but not limited to, the metallization of said collar is carried out

  with a Cu, SnPb (Copper, Tin-Lead) alloy.

  According to a second version of the invention, said collar is made of flexible synthetic material made electrically conductive by incorporation of conductive particles uniformly distributed in

said synthetic material.

  Other features and benefits of

  the invention will emerge from the description which goes

  follow, taken by way of nonlimiting example, with reference to the appended figures in which: - Figure 1 schematically shows a first partial view of a connector fitted to an appliance provided with a shielding recovery device according to the invention. - Figure 2 shows a second view

  partial of the connector of figure 1.

  - Figure 3 shows a first embodiment of the shield recovery device according to the invention. FIG. 1 schematically represents a connector 2 to which a cable 4, partially shown, is connected and around which is mounted a

shielding recovery device.

  Said device consists of a collar 6 of electrically conductive flexible synthetic material perfectly matching the outline of the cable 4 and of the connector 2 so as to make a connection

conductive up to 3600.

  According to a preferred embodiment of the invention, the collar 6 is made of a material

  polyamide and has a metallized surface.

  Preferably, this metallization includes a frosting step consisting in preparing the surface of the collar to allow the adhesion of the conductive particles, said step is followed by a chemical deposition to create a conductive layer allowing the

  electrolytic deposit which ensures the resumption of shielding.

  The electrolytic deposition comprises an electrolytic pre-plating step followed by a copper plating step producing a layer of approximately 2 μm in thickness. This step is followed by an electrolytic deposition of a layer of SnPb of approximately 3 pm

thick.

  Preferably, the conductive collar 6 has a first end 10 provided with a closure loop 12 and a second free end 14 which is fixed in the closure loop 12 during the

  mounting said collar 6 around the electric cable 4.

  Said closure loop 12 includes

  second end locking means 14.

  Thus, the diameter of the collar 6 can be easily adapted to the contour of the cable 4 and to that of the connector 2 by a simple adjustment of the length of the second

  end 14 which crosses the loop 12.

  According to a second version of the invention, not shown, said collar 6 has the shape of a ring made from an elastic synthetic material. Thus, during assembly, said collar 6 encloses the electric cable 4 simply by elasticity. Of course, the collar according to the invention is not limited to the application described above but can, in general, be used for any resumption of shielding of a cable on a connector or a ground plane, and especially on the sockets and panels of

patching for pre-wired networks.

Claims (9)

  1. A shielding recovery device for an electric cable intended to be connected to a connector (2) of an electrical appliance, characterized in that said device consists of a collar (6) in   flexible electrically conductive synthetic material.   2. Device according to claim 1, characterized in that said flexible synthetic material is a polyamide.   3. Device according to one of claims 1   or 2, characterized in that the surface of the collar (6) is metallic.   4. Device according to claim 3, characterized in that the metallization of the polyamide is made with a Cu alloy, SnPb.   5. Device according to claim 1, characterized in that said flexible synthetic material is made electrically conductive by incorporation of conductive particles uniformly distributed in said synthetic material.   6. Device according to one of claims 1 to   , characterized in that the conductive collar (6) has a first end (10) provided with a closure loop (12) and a second free end (14) which is fixed in the closure loop (12) during the mounting said collar 6 around the electric cable (4).   7. Device according to one of claims 1 to   , characterized in that said collar (6) has the shape of a ring made from an elastic synthetic material. 8. A method of metallization of a shield recovery collar (6) according to claim 4, characterized in that it comprises a frosting step, followed by a chemical deposition to create a conductive layer allowing the electrolytic deposition, said deposition electrolytic comprising an electrolytic pre-plating step followed by a copper plating step and an electrolytic deposition of a layer of SnPb. 9. Connector for an electrical appliance, characterized in that it comprises a collar (6) of   shielding resumption according to one of claims 1 to 8.