Second safety device

Second safety device

Rest position (seat belt not fastened)

Working position (seat belt fastened)

The second safety device only allows the activation of the pre-tensioner when the seat belt is fastened. It comprises a safety lever (LS) hinged on the support pin (PS) and a spring (MS) which thrusts the arm B1 of the lever against the external diameter of the band.

When the value of the band diameter is maximum (seat belt not fastened) the tooth (D), located on the end of the lever (LS) arm (B") places itself between the masses m1 and m2 preventing them from moving.

When the value of the band diameter decreases (seat belt fastened), the safety lever (LS), rotating on the support pin (PS), releases the masses allowing them to move for pre-determined vehicle deceleration values.

Transport safety device

The transport safety device allows the movement of the seat belt without the risk of activating the pre-tensioner and comprises a spring (MS) fixed on the reel bracket. When the seat belt is not fitted on the vehicle the end (ME) of the spring (MS) keeps the tooth (D) for the second safety leve inside the sensor not allowing the masses to move.

After the reel has been fitted, the spring, pressed between the reel bracket and the support bracket, moves away from the second safety lever allowing it to move freely if the seat belt is fastened.