| 摘要 |
A seat belt retractor (14) includes a spool (16) supported for winding and unwinding rotation, and an emergency locking mechanism (60) which, when actuated, blocks unwinding rotation of the spool (16). The emergency locking mechanism (60) is actuated upon movement of a locking member (72) from a first position to a second position. A collision indicator (74) applies a predetermined force to the locking member (72) to move the locking member (72) toward the second position in response to a predetermined condition indicative of a vehicle collision. A movable spring (100) has a blocking position in which it suppresses noise by resisting movement of the locking member (72) toward the second position. The spring (100) is movable into and out of the blocking position in response to rotation of the spool (16). As a fail-safe feature, the spring (100) is deflectable under the influence of the predetermined force, and thus permits the collision indicator (74) to move the locking member (72) toward the second position in response to the predetermined condition when the spring (100) is in the blocking position.
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