A seat belt pretensioner is a device that is used to hold a passenger firmly in their seat just before and at the start of a collision (especially in a front or head on collision) and then allow that passenger to come into contact with the inflated airbag in a controlled way. With a seat belt there is still a small space between it and the passenger. If a frontal collision occurs, the passenger’s body moves forward quickly but the seat belt stiffens up to restrain the passenger from any further forward movement. The passenger’s body can also compress against the seat belt in the slight forward movement. Pretensioners tightens and reduces slack in seat belts to protect occupants from rapidly moving forward in the event of a crash.
The idea of a retractor pretensioner is to tighten up any slack in the belt webbing in the event of a crash. The main part of the pretensioner consists of a small.Read More
Buckle pretensioners are attached to the inboard side of the front seat and is operated mechanically. It is usually connected to the seat belt buckle assembly. Read More
Anchor pretensioners are usually attached to the outboard side of the front seat, or they may be attached to the floor, next to the outboard side of the front seat. Read More