How Seat Belt Reminder Works

That annoying sound you may hear when you are not buckled in is not their just to annoy, but to notify you of an important thing you should be doing: buckling in. The vehicle knows whether or not you are buckled in through the use of sensors or switches. A vehicle can include several types of sensors: weight sensor passenger seat, speed sensor, and connection sensors in buckles. The dash indicator light or an alarm goes off when a conditional action based on the sensors state occurs.

The main switch is known as the Reed switch. It is one of the most reliable ways to detect if the seat belt is being used. It works along with the seat sensor to first establish if someone is sitting. When there is enough weight on the seat, it determines that someone is sitting. If it senses that someone is sitting, it moves onto enabling the airbags. If the seat belt buckle is not engaged, the vehicle will display a sign that states the airbags are not on. Most people know this as the symbol with a person belted into their seat and an airbag near them. This is where that annoying sound or light can come from. Once the seat belt is buckled, the Supplemental Restraint System can now properly work to protect the driver or passenger(s) in the vehicle.

However, a seatbelt or other parts of the SRS can only work as well as the state of their condition. If something is broken, ripped, jamming, or in need of some kind of repair or replacement it is important to tackle the problem right away. For example, if your seat belt is not buckling in properly, you may be in need of seat belt buckle repair. Seat belt reminders are one of the main tools used in order to insure the safety of those inside the vehicle. These sensors or lights may end up not working properly over time as well. If there is an issue, it should not be ignored as the SRS may not be able to protect you. If you need any services regarding your vehicles SRS, visit SafetyRestore.com. Safety Restore is a company that specializes in repairing all components of the vehicles SRS. Be like the thousands of customer who trust Safety Restore to help them save time, money, while retaining quality.

Quick and easy process of getting items shipped to them for repair. 24 hour turnaround on repairs as advertised. Quality work at a reasonable price. Very satisfied, will be using them again.

Posted by Terrell Johnson on Wednesday, November 1, 2017

How Seat Belt Locking Mechanism Works

Exactly how seat belt locking mechanism works

Ever wonder, “How does a seat belt locking mechanism work?” If you have, I am here to give you the answer. It truly is funny how such a small component in your vehicle can have such a crucial role in maintaining your safety on the road!

In a typical seat belt mechanism, the material webbing is connected to a retractor mechanism. The main component in the retractor is a spool, which attaches to one end of the seat belt webbing. Also inside of the retractor, there is a spring that applies a torque—which is a rotation force—to the spool. This enables the spool to rotate so that it can wind up and release any slack in the webbing.

When the webbing is pulled out, the spool rotates in a counter-clockwise direction, which, in effect, turns the attached spring in the same direction. Ultimately, the rotation of the spool works to untwist the spring. Since the spring likes its original shape, it resists this twisting movement. If the webbing is released, the spring will tighten up, spinning the spool clockwise until no more slack is present in the seat belt.

There is a locking mechanism in the retractor that prevents rotation of the spool when a vehicle is involved in a crash. Two locking systems: systems activated by a car’s movement and systems initiated by the seat belt movement are commonly seen today.

The first system, triggered by the car’s movement, locks the spool when the car faces rapid deceleration—such as when it comes in contact with another vehicle or object. When the car lurches to a stop, the inertia from that causes the pendulum (the central operating element inside this mechanism) to swing forward and the pawl found on the opposite end of the pendulum gets a hold of a toothed ratchet gear on the spool. Because of the grip of the pawl, the gear cannot rotate counter-clockwise, nor can the spool that is connected. When the seat belt webbing is loosened again after the collision, the gear swivels clockwise and the pawl unfastens.

The latter locking system locks the spool when something jerks the material webbing. The activating force in most designs is the speed of the rotating spool. Unlike the first locking mechanism, the central operating element in this mechanism is a centrifugal clutch—a weighted pivoting lever that is fixed to the rotating spool. The lever does not pivot at all when the spool spins slowly because a spring keeps it in its place. However, when something pulls on the seat belt webbing, this makes the spool spin more quickly and the centrifugal force brings the weighted end of the lever outward. The extended lever then pushes a cam piece attached to the retractor housing. This cam piece connects to a pivoting pawl by a sliding pin. As the cam moves to the left, the pin travels along a groove in the pawl, which pulls the pawl into a spinning ratchet gear fixed to the spool. The pawl then can lock into the gear’s teeth, which thwarts counter-clockwise rotation.

If you see that your locking mechanisms aren’t working properly in your vehicle, or if you have any other problems with your seat belts, turn to the company Safety Restore. The skilled engineers at Safety Restore have been specializing in seat belt repair for years and are bound to help you!

How Seat Belt Works in a Car

See how seat belt works in a car

Seat belts are something we use each and every day (or at least we really should be). Oftentimes, we will enter our vehicle and the first thing we’ll do (sometimes before even starting the car) is buckle into our seat belt! It has become such a commonplace thing that most of us don’t even pay much attention to it, aside from buckling ourselves in. However, it certainly is important to know about the different seat belt parts and how the mechanism works as a whole. Knowledge is power. Plus, when it comes to such an important safety component in our vehicle, it is important to know it like the back of our hand. After all, if anything were to go wrong with it, we’d know what to do and how to fix it.

First and foremost, seat belts are designed so as to secure the occupants of a vehicle into their seat in order to keep them from moving around or getting projected out of the vehicle in the case of a sudden stop or collision. Seat belts are primary restraint systems that work alongside the airbags in a vehicle—the secondary restraint systems. Seat belts also protect occupants from injuries that could be incurred with airbag impact.

Now there are a few different types of seat belts but some of the main parts of the three-point seat belt mechanism are the seat belt pretensioner, retractor, and webbing. The seat belt pretensioner is also known as the buckle. This is the female part of the seat belt where the retractor goes into. The retractor, obviously, is the male portion of the seat belt. The material webbing is what gets adjusted to fit firmly across the lap and chest/shoulder area. This arrangement allows for the potential force of an impact to be spread across the body rather than to be focused on one area.

As already mentioned, problems certainly can arise with your seat belt. You just want to make sure that you are prepared if they do happen. If you see even something little wrong with your seat belts, don’t hesitate to turn to the company Safety Restore. When it comes to the repair of seat belts, Safety Restore will have you covered!

How Seat Belt Works

How seat belt works?

The seat belt is the first line of defense in keeping you safe in the event of an accident. But you may be asking yourself how seat belt works. Let’s dive in.
In a seat belt system, the webbing is connected to a retractor mechanism. Attached to one of the ends of the webbing, is the spool. This is the main element in the retractor. Inside the retractor is a spring that applies rotation force, or better known as torque, to the spool. This is what causes the spool to rotate, winding up any loose webbing.


The seat belt retractor has a locking mechanism that stops the spool from rotating. The retractor can be triggered by the car’s movement. The spool locks when the vehicle decelerates rapidly, like when the vehicle is in a collision. The retractor can also be triggered by something jerking the seat belt webbing.


In some newer seat belt systems, a pretensioner does the job of tightening the seat belt webbing. Unlike the conventional locking mechanism in a retractor that simply keeps the belt from extending any further than it is before the accident, a pretensioner tightens any slack that may exist. It pulls in the seat belt webbing. When an accident occurs, the gas in the pretensioner ignites, causing the pressure that builds up to rotate the retractor. Pulling back any slack in the seat belt puts the individual firm in their seat as to minimize the damage that person may receive during the accident. Pretensioner work together with the conventional locking mechanisms, rather than in place of them.


Now that you know more about how seat belt works, it is safe to say that it is important to have all the mechanisms working and in good condition. If you are ever in an accident, you want to be fully protected. Safety Restore is a company that offers many services including seat belt webbing replacement, seat belt repair, airbag module reset, and more. They repair with 100% OEM parts and have a lifetime warranty. Stay safe on the road and make sure your seat belt is working properly.

How Seat Belt Works

Seat belts are an every day necessity that we have all come to realize and appreciate. With that knowledge, however, many of us use one when on the road but don’t actually stop to think about the physics behind them or how seat belts work in a crash. Below I will explain just that. It is important to know this type of information, especially when we owe a lot of our livelihood to their protection!

Learn about how seat belt works

Basically, seat belts help prevent serious injury or even death by decreasing the velocity of a body as it faces an unexpected decrease in speed. Because of inertia, an occupant of a vehicle will naturally continue travelling forward at the same speed of the vehicle before the impact, even once the car has reached a complete stop. If a car is travelling at the speed of 65 miles an hour and collides into a telephone pole—immediately reducing its velocity to zero—the occupant of the car will still keep moving forward at 65 mph, unless there is something holding them back as a “stopping force.” This can be explained as the velocities of the car and the occupant working independently of each other.

When an occupant wears a seat belt, he or she is able to spread the stopping force needed to decelerate their body across their body, instead of having the force concentrate on one area. Most modern cars are equipped with three-point seat belts that spread the stopping force across the upper body and the pelvis.

Seat belts also prevent occupants from hitting the steering column or windshield at high speed—which can result in quite serious injury and likely death.

Seeing as how important seat belts are, it is crucial to have them repaired immediately upon detecting any faults in them. The company Safety Restore specializes in single stage, dual stage, and even triple stage seat belt repair. It also offers seat belt webbing replacement services, in case your problem lies in ripped, torn, or frayed seat belts. If you are ever in need of seat belt repair, you will be guaranteed quality, safety, and affordable prices at Safety Restore.