| 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 ) is housed inside the retractor spool ( 16 ). The pretensioner mechanism ( 10 ) includes a movable actuator member ( 22 ) slidably coupled to the retractor spool ( 16 ), and a stationary member ( 20 ) secured to the retractor ( 11 ) along a path of slidable movement of the movable member ( 22 ). Helical splines ( 23 ) extend along a portion of the spool ( 16 ), and complementary helical splines ( 25 ) extend along a first portion of the movable member ( 22 ) for slidingly engaging the splines ( 23 ) on the spool ( 16 ). Helical splines ( 29 ) also extend along a second portion of the movable member ( 22 ), and complementary helical splines ( 28 ) extend along a portion of the stationary member ( 20 ) for slidingly engaging the splines ( 29 ) 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 complementary groups of helical splines. 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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