Rotary tightener with ball drive for safety belt rolling unit has first ball acted on by drive piston made with extension facing drive piston, with resting surface for it

摘要

The rotary tightened has a drive (10) and a channel (16) for balls (17) accelerated by gas pressure, and a drive piston (21) for the balls. The ball (19) directly driven by the drive piston has an extension (20) with a surface running transversely to the longitudinal axis of the channel to serve as a resting surface for the drive piston.