Abstract: A belt pretensioner comprising a pyrotechnical piston/cylinder drive has a vehicle-sensitive mass which is formed by a pivotally mounted base (14), a gas generator (18) inserted therein and a piston/cylinder unit (20). To ensure free pivotability of the base (14), the piston (24) is accommodated in the cylinder (22) with axial and radial clearance. The piston (24) is provided with an annular groove (50) in which an annular seal (52) is arranged. When not subjected to the gas pressure from the gas generator, the annular seal (52) is not in contact with the inner wall of the cylinder (22). Under the gas action the annular seal (52) is moved axially along the conically rising bottom (56) of the annular groove (50) and at the same time radially expanded until it comes into sealing engagement with the inner wall of the cylinder (22).

Abstract: Safety belt roll-up device having a housing and a one-piece belt carrier. The housing has a base plate with two side walls extending from the base plate. At least one of the two side walls can be set at an angle and bent into a position in which both side walls are parallel. Each side wall has an opening through which a free end of the one-piece belt carrier extends. The one-piece belt carrier is in the form of a single piece including a belt shaft and a belt reel with a reel flange at each end of the belt reel. The belt reel has a diameter greater than the diameter of the opening in the side wall. The belt carrier is inserted between the side walls bent apart in V-shape. The belt carrier is held at the height of the openings and the end walls moved together to a parallel position.

Abstract: Passive restraining system for securing a seated vehicle passenger with a safety belt firmly holding the passenger in his seat includes vehicle parts displaceable relative to one another in dependence upon a retardation in the vehicle velocity, for tightening the safety belt which is connected to the vehicle parts.