What is Seatbelt Pretensioner?

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Seatbelt Pretensioner:

The seat belt pre-tensioner is one of many actuators involved in a pre-crash safety system. The pre-tensioner aims to secure the occupant safely to their seat by tightening their safety harness or seat belts, to cut back the danger of an injury. By holding the passenger tightly, it prevents them from impacting the wheel or dashboard, or from sliding out of their seat. This also improves the effectiveness of the airbag by allowing the passenger to impact the airbag in an exceedingly controlled and predictable way.

 

The concept of the safety harness is tightened originated in the 1950s, from a patent that used a tool to secure pilots into their ejection seats before ejection. The Mercedes-Benz S-Class was the primary automobile to implement the pretensioner. In additional recent cars, the pretensioner works in conjunction with a force limiter to secure the passenger while also adjusting the slack throughout the crash, reducing the danger of chest compression and injury because of the safety harness. Some systems will tighten the belt during fast acceleration or deceleration, even within the absence of a crash, like an evasive maneuver.

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