Abstract: A spring-driven reeling mechanism for safety belts 17 in motor vehicles has a belt reel 11 which is rotationally fixedly connected to a first draw reel 12 with a spiral-shaped guide groove 15. A flexible draw member 13 is wound into the guide groove 15 and extends to a second draw reel 14 with a spiral-shaped guide groove 18. The two draw reels 12, 14 taper in opposite axial directions. The draw reel 14 is acted on by a spiral spring 16 in a direction of rotation such that the safety belt 17 is wound onto the belt reel 11. The spiral spring 16 is accommodated in a hollow cavity 21 of the second draw reel 14.

Abstract: A belt tensioner for safety belt arrangements in motor vehicles has a holder (11) on which are provided a belt winding reel (12) with a safety belt (13) coiled thereon, a blocking arrangement and an additional drive (15) connected via clutch (20) to the belt winding reel (12). The additional drive (15) contains a pressure source (16) which abruptly builds up a high pressure in a pressure chamber on being triggered and also contains a torque generating device (18) acted on by the pressure in the pressure chamber (17) and a drive shaft (19) connected to the latter. The drive shaft (19) is rotationally fixedly connectable to the belt winding reel (12) via the clutch (20).