Patent ID: 7581613

Claim:
A seat belt device comprising: a first unit for determining a possible collision of an automobile in response to a manipulation thereof by a driver; a second unit for detecting the collision of the automobile; seat belt webbing; a spindle around which a portion of the seat belt webbing is wound; a first pretensioner having a motor to rotate in a direction to wind the seat belt webbing onto the spindle in response to a signal indicative of the possible collision determined by the first unit; a second pretensioner pyrotechnically driven to rotate in a direction to wind the seat belt webbing onto the spindle in response to a signal indicative of the collision detected by the second unit; and a controller configured to cancel an operation of the first pretensioner after an activation of the second pretensioner in a state in which the first pretensioner and the spindle are mechanically connected to each other, wherein the first pretensioner includes a limiter for restricting the motor from transmitting a driving force to the spindle exceeding a predetermined threshold, while resisting the spindle rotating in a direction to unwind the seat belt webbing.