Chain driven pretensioner and retractor

摘要

An apparatus (20, 400) comprising: first driven gear (402) operatively linked a spool of a retractor (20) to rotate the spool (24) in a direction of retraction to cause a seat belt (31) wound thereabout to retract; flexible first driving member (430, 432) having a front end (435) initially maintained out of engagement with the driven gear and pushed into engagement with the first driving member to cause same to rotate; second driving member (420) operatively linked to a rear end of the first driving member for pushing the first driving member into engagement with the driven gear thereby causing the driven gear to rotate.