| 摘要 |
A clutch includes a clutch housing that rotates with a spindle and has inner teeth; a pair of pawls that can engage with the inner teeth; a gear wheel that is joined to a motor and has a pair of sliding grooves that hold the pawls such that the pawls can move in the sliding grooves between a first position when the motor is not operating, a second position at which the pawls engage with the inner teeth of the clutch housing through operation of the motor, and a third position at which the pawls become positioned on the opposite side to that of the second position across the first position upon operation of the pretensioner; and a return prevention mechanism that prevents the pawls from returning to the first position and the second position after having moved to the third position. |
