| 摘要 |
A locking device for vehicle safety seat belts of the type in which a strap of the seat belt is automatically retracted and wound onto a wind-up shaft when the seat belt is not in use, for preventing rapid extension of the strap. The device comprises a rotatable body rigidly attached to one end of the shaft and arranged to rotate with the shaft; a stop means positioned outside the rotatable body and fixedly mounted in relation to the shaft; and at least one elongated locking member movable in relation to the rotatable body and positioned between the rotatable body and the stop means. The locking member is movable on a guiding surface on the rotatable body from a radially seen inner position, free position, in which it does not prevent rotation of the rotatable body, to a radially seen outer position, locking position, in which it engages with both the stop means and the rotatable body and, thus, prevents further turning of the rotatable body. An inertia means is pivotally mounted on the shaft adjacent the rotatable body and is provided with a guiding slot for each locking member. A spring means is further arranged to keep the rotatable body and the inertia means in a determined angular position in relation to each other when the strap is slowly extended and arranged to yield when the strap is rapidly extended, so that the rotatable body and the inertia means change angular position in relation to each other, whereby the locking member is moved and guided in the slot of the inertia means from the free position to the locking position.
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