Reel during operation

Reel during operation

P3M151L13

During combustion the pyrotechnic charge produces a gas which creates pressure exerting a force which pushes the piston (1) upwards.

The upwards linear movement of the piston (1), on which a cable (2) is fitted with one end fixed to the coil (3) flange, transforms the rotary movement of the actual coil, rewinding the band by several centimetres.

At the end of the operation, the belt remains locked showing that activation has taken place.

After each impact, which has resulted in the activation of the pre-tensioner, the belt cannot be used and should be replaced.