Buckle of a seat belt for a motor vehicle

Buckle of a seat belt of a motor vehicle comprising:

• a female element (5) consisting of an insulating housing in which electric feed circuits are housed for means of indicating the closure or opening of the buckle, said circuits comprising electric contacts that are kept in a closed position and can be separated by a mobile insulating bar (10) in the housing against the action of elastic means (11), and a male element (1) mounted on the belt and comprising a pin (3) designed to be engaged in a slot of the female element (5) and to be clamped in the latter by unlockable elements (9), the introduction of said pin (3) in the slot (6) causing the movement of the bar (10) which controls the opening of the electric contacts, the buckle of the seat belt being characterized in that the electric contacts are carried by a first tongue and a second tongue (30, 35), the first tongue (30) having a V-shaped section with two branches (31, 32) forming a convex section, one of which constitutes an electric contact and a cambered end (34), the convex sections facing opposite the second tongue (35) which has a V-shaped section with branches (36, 37), one of which constitutes an electric contact and is designed to bear against the electric contact of the first tongue (30), the cambered end (34) being designed to interact with the bar (10) to control the opening of the electric contacts.