| 摘要 |
A pretensioning apparatus (6) for seat belt webbing (2) at a belt anchor end (3) of a three point vehicle safety restraint seat belt. The pretensioning apparatus (6) has a fixed member in the form of a cylinder (7) that may be anchored to a vehicle seat (1) at the belt anchor side of the vehicle. A movable member in the form of a piston (13) is connected to the webbing (2) in the region of the belt anchor end (3). A means is provided for moving the movable member relative to the fixed member in a generally horizontal direction, to move the seat belt webbing (2) in a pretensioning direction in response to a signal from a crash sensor. A webbing guide (11) is fixed to the seat (1) to provide an effective anchorage point spaced from the belt anchor end (3) of the webbing under pretensioning conditions.
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