| 摘要 |
A pretensioner for a vehicle seat belt retractor of the type having a rotatable take-up reel on which seat belt webbing can be wound, which comprises: (i) an elongate pressure chamber (2); (ii) a plurality of projectiles (11) located in the pressure chamber; (iii) gas generating means (5) for generating a high-pressure gas within the pressure chamber so as to propel the projectile along the pressure chamber; (iv) a drive surface (12; 21; 25; 34; 41) upon which the projectiles impinge when propelled along the pressure chamber by the high-pressure gas, the drive surface being connected to, or comprising a part of, the rotatable take-up reel (42) of the vehicle seat belt retractor and arranged to be driven by the impinging projectiles (11) so as to rotate the rotatable take-up reel in a belt retraction direction when impinged upon by the projectiles, so as, in operation, to take up slack in the seat belt webbing, and to pull the seat belt webbing against the vehicle occupant.
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