Patent ID: 8678440

Claim:
A seat belt retractor assembly for a motor vehicle occupant restraint system of a motor vehicle of the type having a shoulder belt section, a lap belt section, and a latch plate between the lap and shoulder belt sections engageable with a buckle, the assembly comprising: a retractor frame adapted to be mounted to the motor vehicle, a shoulder belt spool affixed to the frame for rotation and connected with the shoulder belt section, the shoulder belt section wound on the shoulder belt spool for stowing and paying out the shoulder belt section, a lap belt attachment affixed to the frame and connected with the lap belt section, and a lap belt pretensioner actuator and a shoulder belt pretensioner actuator with a single gas source generating an activation gas communicating with both actuators, the lap belt pretensioner actuator coupled with the lap belt section for pretensioning the lap belt section and the shoulder belt pretensioner actuator coupled with the shoulder belt spool for winding the shoulder belt spool for pretensioning the shoulder belt section, a cylinder with a piston acting on a flexible member, coupled with at least one of the lap belt pretensioner actuator and the shoulder belt pretensioner actuator and driven by the piston and the flexible member.