| 摘要 |
<p>A seat belt retractor has a spool (1) on which seat belt webbing is wound, arranged for rotation about its longitudinal axis, for payout and winding in of seat belt webbing. A torsion bar (11) is coaxial with the spool and has one end fixed to the spool. A ratchet (9) is fixed to the other end of the torsion bar and a toothed wheel (10) is fixed to the spool to rotate with the spool. A pivoting lock bar (6) extends across the length of the spool, having at least one pawl (7, 8) fixed at each end, to engage with the toothed wheel and with the ratchet respectively. The pawl on the spool side is arranged to be weaker than the other pawl so as to shear under a predetermined force to allow the spool to rotate and the torsion bar to twist.</p> |
