Abstract: The invention relates to a reversible belt tensioner (10) comprising a drive motor (12), a spindle (14) connected to the drive motor (12), a spindle nut (16) adapted to be displaced in axial direction (18) on the spindle (14), a catch (20) the one end of which is connected to the spindle nut (16) and a belt buckle (22) connected to the other end of the catch (20), wherein at least one of the following features prevents the spindle nut (16) from jamming during travel against block: a cylindrical guiding portion (50) inside the spindle nut (16) interacting with the outer geometry of the spindle (14); a freewheel mechanism (48) between the drive motor (12) and the spindle (14); a compression spring (70) between the belt buckle (22) and a stop.

Abstract: The invention relates to a belt buckle presenter for a seat belt system of a vehicle comprising a belt buckle which is coupled to a spindle drive (16) through force transmission means (14), the force transmission means (14) including a locking member (40) which in normal operation is movable along a threaded spindle (30) of the spindle drive (16) in axial direction and in the case of restraint can be deformed by a restraining force acting on the belt buckle (12) so as to adopt a locking position in which the locking member (40) positively engages in the threaded spindle (30).

Abstract: The invention relates to a reversible belt tensioner (10) comprising a drive motor (12), a spindle (14) connected to the drive motor (12), a spindle nut (16) adapted to be displaced in axial direction (18) on the spindle (14), a catch (20) the one end of which is connected to the spindle nut (16) and a belt buckle (22) connected to the other end of the catch (20), wherein at least one of the following features prevents the spindle nut (16) from jamming during travel against block: a cylindrical guiding portion (50) inside the spindle nut (16) interacting with the outer geometry of the spindle (14); a freewheel mechanism (48) between the drive motor (12) and the spindle (14); a compression spring (70) between the belt buckle (22) and a stop.

Abstract: The invention relates to a belt buckle presenter for a seat belt system of a vehicle comprising a belt buckle which is coupled to a spindle drive (16) through force transmission means (14), the force transmission means (14) including a locking member (40) which in normal operation is movable along a threaded spindle (30) of the spindle drive (16) in axial direction and in the case of restraint can be deformed by a restraining force acting on the belt buckle (12) so as to adopt a locking position in which the locking member (40) positively engages in the threaded spindle (30).