| 摘要 |
A seatbelt pretensioner mechanism ( 10 ) for use with a seatbelt retractor ( 11 ). The retractor ( 11 ) has a spool ( 16 ) configured for winding a seatbelt webbing thereon. The pretensioner mechanism ( 10 ) includes a movable actuator member ( 22 ) slidably coupled to the retractor spool ( 16 ), a stationary member ( 20 ) secured to the retractor ( 11 ) along a path of slidable movement of the movable member ( 22 ), and a base member ( 50 ) slidably coupled to the actuator ( 22 ) and to the stationary member ( 20 ). Helical splines ( 23 ) extend along a portion of the spool ( 16 ), and one or more complementary pins ( 25 ) extend along a first portion of the movable member ( 22 ) for slidingly engaging the splines ( 23 ) on the spool ( 16 ). Pins ( 28 ) also extend along a second portion of the movable member ( 22 ), and complementary helical splines ( 29 ) extend along a portion of the base member ( 50 ) for slidingly engaging the pins ( 28 ) on the second portion of the movable member ( 22 ). Activation of the pretensioner mechanism ( 10 ) produces a sliding movement of the movable member ( 22 ), thereby producing simultaneous sliding engagement between the groups of pins and helical splines. A coupling mechanism ( 80 ) restricts rotation of the base member ( 50 ) during sliding engagement between the splines and pins. Simultaneous sliding engagement between the complementary groups of helical splines produces a rotation of the spool ( 16 ) with respect to the stationary member ( 20 ), thereby pretensioning a seatbelt webbing wound on the spool ( 16 ).
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