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Connection between two elements of an electrical return circuit. The device comprises a female type connection receptacle fastened to a conductive structure and a male type plug connected to a cable, said plug including a groove, and a locking spring co-operating with the plug and with the receptacl

Connection between two elements of an electrical return circuit. The device comprises a female type connection receptacle fastened to a conductive structure and a male type plug connected to a cable, said plug including a groove, and a locking spring co-operating with the plug and with the receptacle.

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1. An electrical connection device between an electric cable and a conductive structure, comprising: a female type connection receptacle fastened to said conductive structure, and a male type plug connected to one end of said cable, wherein said receptacle includes a bore shaped and dimensioned to r

1. An electrical connection device between an electric cable and a conductive structure, comprising: a female type connection receptacle fastened to said conductive structure, and a male type plug connected to one end of said cable, wherein said receptacle includes a bore shaped and dimensioned to receive said plug with electrical contact, wherein said plug includes a groove, wherein a locking spring is mounted on said connection receptacle and includes a flexible branch suitable for engaging in said groove when said plug is engaged in said bore, and wherein said groove is formed at a distance from the end of said plug, said bore in said receptacle presents an inlet orifice via which the plug is engaged, the length of the plug and the length of said bore are such that said groove is situated outside the inlet orifice when the plug is engaged in said bore, and said locking spring comprises a cover shaped to co-operate both with said groove and with an attachment rim of said receptacle. 2. An electrical connection device according to claim 1, wherein said cover has a lateral extension with an opening defined therein, the opening being shaped and dimensioned to co-operate with the groove of said plug. 3. An electrical connection device according to claim 2, wherein said opening is a notch having a mounting portion that opens into an edge of said lateral extension and that leads to a portion of rounded outline that is retained in said groove. 4. An electrical connection device according to claim 2, wherein said opening is an oblong hole with a closed outline having a circular portion of diameter substantially equal to the diameter of said plug and a circular portion of diameter smaller than the diameter of said plug but greater than the diameter of the bottom of said groove. 5. An electrical connection device according to claim 1, wherein said bore in said receptacle is a blind hole. 6. An electrical connection device according to claim 1, wherein said cover has flexible fingers, and the ends of said fingers are provided with teeth forming barbs that co-operate with said attachment rim. 7. An electrical connection device according to claim 1, wherein said cover includes a resilient projection bearing against the end of said receptacle. 8. An electrical connection device according to claim 1, wherein said cover is provided with two studs constrained to move in opposite parallel grooves of said receptacle so that the cover is held captive to said receptacle. 9. An electrical connection device according to claim 8, wherein said attachment rim of said receptacle is constituted by a hole, and said cover is provided with a finger having a hook co-operating with the edge of said hole. 10. An electrical connection device according to claim 9, wherein said hole opens out in axial alignment with said bore, and the end of said plug carries a sealing gasket. 11. An electrical connection device according to claim 8, wherein said plug is provided with an annular gasket coming into contact with an internal shoulder of said receptacle. 12. An electrical connection device according to claim 8, wherein the bore of said receptacle for receiving the plug is perpendicular to a mounting plane thereof, said receptacle includes two above-mentioned attachment rims in the form of holes disposed laterally, and said cover includes two parallel fingers having hooks that co-operate with respective ones of said attachment rims. 13. An electrical connection device according to any one of claims 8 to 12, wherein said cover includes a positioning inspection window, and the receptacle includes a colored zone with which said window is positioned in register when the cover is correctly positioned.