Seat belt pretensioner locking device

摘要

A seat belt pretensioner including a casing defining a pivot axis and having a locking member, a driving mechanism supported by the casing, a flexible connecting member, and a cam. The driving mechanism includes a movable member that moves relative to the casing during pretensioning. The flexible connecting member has a first end coupled to the movable member and a second end that is attachable to one of the anchor, the buckle and the webbing. The cam includes a locking surface having a cross-sectional shape that is an Archimedean spiral. The cam is rotatable about the pivot axis between a non-locking position, in which the connecting member is able to freely move between the cam and the locking member, and a locking position, in which the locking surface clamps the connecting member to the locking member to prevent any further movement of the connecting member relative to the locking member.

主权项

1. A seat belt pretensioner for use with a seat belt assembly having an anchor, a buckle and a webbing, the pretensioner comprising:
a casing defining a pivot axis and including a locking member; a driving mechanism supported by the casing, the driving mechanism including a movable member that is configured to move relative to the casing during pretensioning; a flexible connecting member having a first end coupled to the movable member and a second end configured to be coupled to one of the anchor, the buckle and the webbing; and a cam including a locking surface having a cross-sectional shape that is an Archimedean spiral, wherein the cam is rotatable about the pivot axis relative to the casing between a non-locking position, in which the connecting member is able to freely move between the cam and the locking member of the casing, and a locking position, in which the locking surface clamps the connecting member to the locking member to prevent any further movement of the connecting member relative to the locking member.