RESTRAINING DEVICE HAVING A SEATBELT AND HAVING A BELT PRETENSIONER

A restraining device for a motor vehicle occupant, having a seatbelt that is equipped with a belt pretensioner via which the tensile force on the seatbelt can be increased. A vehicle seat is equipped with a tubular receptacle as a seat cross tube that simultaneously accommodates the belt pretensioner in its interior. The belt pretensioner, which is designed as a linear pretensioner, has a coupling element for the seatbelt, which coupling element is translationally movable along an axis of motion in the tubular receptacle and is connected to a drive cylinder by a tensioner. For this purpose, the seatbelt is reduced to approximately half its width by rolling up opposite side edges by a guide element so that the belt pretensioner can be accommodated without any difficulty in a seat cross tube with a small inside diameter.