Belt tightener for safety belt has drive for coupling to roller when coupling engaged when acceleration sensor responds; drive consists of at least two independently controlled drive units

摘要

The belt tightener has a frame, a belt spool roller, a retraction arrangement (10), a lock device and drive (20) for coupling to the roller normally decoupled by a coupling and connected to rotate with the roller when the coupling is engaged when an acceleration sensor responds. The drive consists of at least two drive units (16,18) that are independently controlled.