Seatbelt tightening device, comprising pressure regulating element located in front of jet

摘要

A metal pipe (14) is accommodated inside a complementary bore (12) located a housing (10). A pyrotechnical detonating composition (20) is attached to the axial end of a pressure chamber (18) formed by a hollow piston (16) positioned inside the pipe (14) and acting on a toothed wheel (32) with a toothed outer surface (28). The opposite end of the piston (16) is provided with a pressure relief opening (24) comprising a jet (26) fitted with a pressure regulating element (27).