MASS-BODY DRIVE FOR A ROTARY TIGHTENING DEVICE

摘要

In a rotary tightening device for a safety belt, particularly in motor vehicles, having a belt retractor, whose belt take-up shaft upon triggering of the rotary tightening device coupled thereto is rotated in the take-up direction of the safety belt, there being associated with the belt take-up shaft, as a drive, a driving wheel in whose plane the housing of the belt retractor forms a channel, which embraces the driving wheel over at least part of its periphery, for the through passage of accelerated mass bodies acting as driving means upon the driving wheel and lying loosely adjacent to one another in the channel, the drive is to be improved. To said end, it is provided that the driving wheel (11, 12, 54) is provided at its outer periphery with a gearing (recesses 23; 55) for receiving the mass bodies (18), the pitch of the gearing substantially corresponding to the spacing of the mass bodies (18).