To stably engage a connector of a pre-tensioner with an anchor on the seat belt side even when inertia force acts in a direction for releasing engagement.
A lap anchor 5 and a connector assembly 14 are engaged with each other by a latch 39 energized by a first latch spring 40. When inertia force acts on the connector assembly 14 in a direction for releasing engagement between the connector assembly 14 and the lap anchor 5, the latch 39 begins to move in a direction for releasing engagement. Then engagement shoulder parts 39d, 39e of the latch 39 abut against latch holding parts 43a, 43b of a second latch spring 43, and a move of the latch 39 in a direction for releasing engagement is prevented. Thereby, the connector assembly 14 and the lap anchor 5 are stably engaged with each other, and releasing of engagement between the connector assembly 14 and the lap anchor 5 is reliably prevented even when inertia force acts for releasing engagement.
Ryukichi Abe
Hirukawa Masanobu
Hiroki Shirai
Norihiko Uchida
Hideo Sugai
Hiroshi Nagisawa
Akira Yonezawa