| 摘要 |
<p>A seat belt retractor (10) includes a seat belt spool (20) supported by a frame (12) for rotation about an axis (A) in belt withdrawal and belt retraction directions. A ratchet wheel (26) is connected to and rotatable with the spool (20). A pawl (30) is pivotable between a release position in which it does not engage the ratchet wheel (26) to allow rotation of the spool (20) in the belt withdrawal direction and a lock position in which it engages the ratchet wheel (26) to prevent rotation of the spool (20) in the belt withdrawal direction. The pawl (30) pivots from the release position towards the lock position in response to rotation of the spool in the belt withdrawal direction at a rate of acceleration above a predetermined rate. A spring (40) is coupled to the frame (12) and the pawl (30) to pivot the pawl to the lock position after the pawl pivots beyond a predetermined position defined by a line (X) interconnecting the pivot point of the pawl and the point at which the spring is connected to the frame (12).</p> |
