Patent ID: 7293504

Claim:
An electropyrotechnic initiator comprising a box ( 1 ) of plastic material and a pyrotechnic charge ( 6 ), said charge ( 6 ) comprising at least one compound, characterized in that the box ( 1 ) contains two sub-assemblies: a first sub-assembly ( 2 ) made in a single part comprising a plastic wall ( 4 ) integral with a bottom ( 5 ) also made of plastic, having a face ( 15 ) and forming a container, a second plastic sub-assembly ( 3 ) made of plastic having a main axis ( 10 ), traversed by at least two pins ( 11 , 12 ) parallel to said axis ( 10 ), said pins ( 11 , 12 ) being connected together by an electric bridge ( 13 ) on a face ( 14 ) of said second plastic subassembly ( 3 ), said face ( 14 ) being hollowed symmetrically over a height H and a width L, said sub-assembly ( 3 ) forming a base, the second sub-assembly being molded over the pins ( 11 , 12 ), said first ( 2 ) and second ( 3 ) sub-assemblies being hermetically assembled by ultrasonic welding, and wherein, before assembly of sub-assemblies, the internal diameter D 1 of the first sub-assembly ( 2 ) is smaller than the external diameter D 2 of the hollowed portion of the second sub-assembly ( 3 ) in the portions of the first and second sub-assemblies which are disposed opposite one another during ultrasonic welding.