Operation (page 2 of 3)

The intervention of the seat belt pre-tensioning device takes place as follows:

• in normal conditions the pre-loaded spring (9) for the power unit and the moving element (10) connected to it are kept in positin by the locking lever (2) kept in position, in turn, by the section of the front part of the deceleration sensor (5) (figure A);

• in the case of an impact the deceleration sensor (5) moves in the same direction as the vehicle is travelling in, which releases the locking lever (figure B).

NOTE At this point the lever, subjected to the force of the main spring (9), is free to rotate releasing the moving element (10) loaded by the spring (figure C).