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How Does it Work / Seat Belts

How Seat Belts Work

Seat belts, also known as safety belts, are a safety feature that secures the passenger to the vehicle seat in case of an accident. Seat belts are part of the occupant restraint system which avoids harmful movement to passenger which could lead to injuries and protects the occupants from ejecting from the vehicle. Many seat belt designs have been developed to several different applications. The most common safety belt is the three point seat belt found in most cars. This belt is attached in three places, two mount near the rear of the seat and one towards the top of the side pillar.

Car Safety Belt
Car Safety Belt



The safety belt is worn over the waist and shoulder and is adjustable. Harness style of safety belts are worn diagonally over the chest. This five point harness seat belt is meant for children is car seats and racing applications. They provide extra safety and consists of two shoulder belts and a lap portion which is connected to a belt in between the legs.

Seat Belt Receptacle
Safety Belt Receptacle

Active Seat Belts

Active seat belts are also known as inertia belts. They increase their effectiveness by self adjusting to the occupant in the event of an accident. This is done by tightening the belt instantly with the help of a piston which is driven by expanding gas. These are triggered by sensors placed in the car, like the air bag system. The function of the web-clamps is to clamp the webbing as the webbing is tightened on the central drum, when the car encounters an accident. It is created with a special stitch which rips when it determines pressure. This functionality is useful when the occupant is trapped in a fire inside the car and the seat belt won’t let go. The active seat belt concept combined with the three point seat belts produce a much safer vehicle.

The seat belt light on the dashboard indicates when the seat belt has been fastened properly. A warning sound is also given for few seconds before the light switches off in most vehicles. A study has revealed that drivers who wear seat belts, along with air bags safety systems will survive an accident better than people that don't.

How Does it Work / Seat Belts

Check Manufacturer Specific Seat Beat Questions and Answers

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