Seatbelts are the most basic restraining device used to help protect vehicle occupants in the event of a collision. But even the classic seatbelt can be improved with pretensioners and force limiters that are designed to help effectively control the movement of properly seated and properly restrained occupants within the limited cabin space and reduce the impact on a passenger’s chest.
How does it work?
In certain types of frontal impacts, pretensioners cinch the belt tighter to immediately begin absorbing a vehicle occupant’s forward momentum. After a preset amount of force has been reached, force limiters slowly release the tension of the belt to further reduce the energy from the impact.