| 摘要 |
A webbing retractor for use in an occupant restraining seatbelt system for a vehicle includes a lock wheel supported on one end portion of a webbing take-up shaft and an acceleration sensor. When an emergency situation of the vehicle occurs, the lock wheel and the acceleration sensor are engaged with each other, thereby causing a lock bar to be engaged with a ratchet wheel rigidly secured to the take-up shaft, and thus locking the take-up shaft from rotating in a direction in which the webbing is unwound. The lock wheel and the lock bar are connected together through a friction member by a predetermined frictional force. Accordingly, even when the lock wheel and the acceleration sensor are still engaged with each other after an emergency situation of the vehicle has ceased, the webbing can be unwound from the take-up shaft with a force which is greater than the predetermined frictional force.
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