Patent ID: 7641233

Claim:
A vehicle occupant restraint device mounted on a back of an occupant's seat, for restraining a shoulder of an occupant thereby to protect a body of said occupant against a motor vehicle accident comprising: a drive unit for driving in response to a collision sense signal; a rotating shaft adapted to be triggered by driving of said drive unit for instantaneously moving from an initial position to a predetermined target position, the rotating shaft including: an arm portion mounted thereto, the arm portion having a receiving portion for receiving a shoulder side of said occupant softly; a flat shaft; a spline shaft and a torsion spring for applying rotation of said flat shaft and said spline shaft; a cam rotor for locking the applying force of said torsion spring usually engages with said flat shaft and said spline shaft; a gear lock for transmitting the rotation of said drive unit, the gear lock engages with the cam rotor on a side of said flat shaft; and a lock plate for locking said shoulder receiving portion at a predetermined position, the lock plate engages with the cam rotor on a side of said spline shaft.