Bent pre-tensioner tube

A pre-tensioning device for a seat belt comprising a bent tube having a gas generator section and a piston path section with a bent section therebetween, a piston which is guided in the piston path section of the tube and which upon triggering is influenced to move by gas generated by a gas generator located in the gas generator section of the tube, a cable led into the tube through a cable opening and attached to the piston, the gas generator section of the tube being offset from the piston path section of the tube and the bent section forming a narrowed cross-section, relative to the gas generator section and the piston path section, inside the tube forming a gas flow path for the gas flowing from the gas generator section of the tube to the piston path section of the tube upon triggering of the gas generator, the tube bent section forming at its outer wall at the outside of the bend formed by the bent section a hollow throat forming a guide surface adjacent to the cable opening for guiding the cable, an inner wall of the tube at the inside of the bend formed by the bent section being in contact with the outer wall at its central area at a narrowest bending location of the bent section with the inner side of the hollow throat, the hollow throat forming the gas flow path on both sides of the hollow throat between the outer wall and the inner wall.

A pre-tensioning device for a seat belt comprising a bent tube having a gas generator section and a piston path section with a bent section therebetween, a piston which is guided in the piston path section of the tube and which upon triggering is influenced to move by gas generated by a gas generator located in the gas generator section of the tube, a cable led into the tube through a cable opening and attached to the piston, the gas generator section of the tube being offset from the piston path section of the tube and the bent section forming a narrowed cross-section, relative to the gas generator section and the piston path section, inside the tube forming a gas flow path for the gas flowing from the gas generator section of the tube to the piston path section of the tube upon triggering of the gas generator, the tube bent section forming at its outer wall at the outside of the bend formed by the bent section a hollow throat forming a guide surface adjacent to the cable opening for guiding the cable, and that a fixing part enters into the bent tube with a projection adapted to fit within a pinched area of an inner wall of the bent tube so as to form an interference fit and supports the inner wall of the bent tube.