Belt Seat

How does a seat belt know when to lock in a crash?

I mean sometimes when I lean forward in the seat it locks and I can’t move forward but this rarely happens. I am able most of the time to move freely and the seat belt moves forward with me. So how does it know when to lock and hold you back? Is it so sudden quick pull on the belt or something? Thanks.

Typically, seatbelts consist of a lap belt and a shoulder belt, which are securely attached to the frame of the car in order to keep passengers in their seats.

The seatbelt applies most of the stopping force to the rib cage and the pelvis, widening the area of stopping force so the damage is less.

The seatbelt itself, made out of webbing, has more give than a windshield or dashboard making the stop not quite so abrupt.

Seatbelts also extend and retract, except when the car comes to an abrupt halt, and then they tighten up and hold the passenger in place.

The belt webbing connected to a retractor mechanism creates the seatbelts extending and retracting movement.

This retractor mechanism contains a spool attached to one end of the webbing and a spring, located inside the retractor.

The spring applies a rotation force to the spool rotating the spool and causing the webbing to wind up.

When pulling the seatbelt out, the spool rotates counter-clockwise, turning the attached spring in the same direction. When releasing the seatbelt, the spring tightens up and rotates the spool clockwise until all the slack is taken out of the belt.

The retractor also has a locking mechanism that halts the rotating of the spool when the car is in an accident. There are two locking mechanisms used in cars, the car’s movement triggers one while the belt’s movement triggers the other.

Locking mechanisms triggered by the car’s movement locks the spool when the car stops abruptly. In this system, the main operating element is a weighted pendulum that swings forward when the car is stopped suddenly.

A pawl located on the other end of the pendulum catches a toothed ratchet gear attached to the spool. When the pawl grips the teeth, the gear is unable to rotate counter-clockwise and consequently the spool cannot rotate either.

When the seatbelt is loosened after the incident, the gear rotates clockwise and the pawl disengages, releasing the ratchet gear teeth.

The second system that locks the spool when the jerking the seatbelt contains a centrifugal clutch, which is a weighted pivoting lever mounted to the rotating spool.

As the spool spins slowly, the lever does not pivot and a spring keeps it in position. When jerking the seatbelt the spool is spun quickly, the centrifugal force drives the weighted end of the lever outward, and the lever pushes a cam piece mounted to the retractor housing.

When this cam, connected to a pivoting pawl with a sliding pin, shifts left, the pin moves along a groove in the pawl. This movement pulls the pawl into the spinning ratchet gear attached to the spool and locks into the gear’s teeth, preventing counter-clockwise rotation…………….

Embrace Life: A new online ad with a twist

Rich Diesslins Out to Lunch Cartoons – OTL – Airline Safety – Fasten Your Seat Belt – Mugs Airline Safety – Fasten Your Seat Belt Mug is new. Why drink coffee out of an ordinary mug when an imprinted mug is so much cooler? Microwave safe, FDA approved. Image is printed on both sides of the mug. Dishwasher use is not recommended….

Rich Diesslins Out to Lunch Cartoons – OTL – Airline Safety – Fasten Your Seat Belt – Tile Napkin Holders Airline Safety – Fasten Your Seat Belt Tile Napkin Holder is measuring 6w x 6h x 4d. Made from high quality solid maple wood with satin finish and two 4.25 commercial grade mirror gloss ceramic tiles. Holds napkins, mail, letters or files. In addition, customized engraving, on the face of the item, is available on request….

Rich Diesslins Out to Lunch Cartoons – OTL – Airline Safety – Fasten Your Seat Belt – Trivets Airline Safety – Fasten Your Seat Belt Trivet is measuring 8w x 8h x .75d. Made of solid wood with padding on back that protects your furniture. Framed trivet comes with 6w x 6h ceramic gloss tile attached to the wood frame….

Cowboy Bebop $34.89 CD ALBUM…

Mister Rogers’ Neighborhood: Learning is Everywhere (Episodes #1651-#1655) $27.62 Children learn from adults… adults learn from each other… and adults learn from children. Whoever is learning or teaching, learning and caring go hand-in- hand. These episodes help children know that there’s lots of fun in learning but there’s hard work and effort too. There’s all kinds of learning: songs with Ella Jenkins, how people make construction paper, sign language, and how hard it can…

Cowboy Bebop: Blue $39.99 Brand New and manufacture sealed. First class shipping from New York. Customer satisfaction is guaranteed….

Teenage Mutant Ninja Turtles-Sky Turtles $1.92 Fasten your seat belts for this one,Turtle Watchers! The mad, bad shredder has concocted an antigravity device and it’s literally sweeping the entire city off its feet. Talk abour being upwardly mobile! Can the Turtles get a grip and bring things back down to Earth so the mayor can tackle his “weightier” problems?sit tight and see for yourself!…

Crash Dummies:Seat Belts Make Sense [VHS] $7.99 …

Smith & Wesson SWBG2TS Border Guard 2 Rescue Knife with 40% Serrated Tanto Blade, Glass Break, and Seatbelt Cutter, Black $17.94 4.4 in. 7Cr17 high carbon stainless steel blade with 5.6 in. aluminum handle. Thumb knob safety belt cutter glass breaker and liner lock. ATTRIBUTES Blade Detail: ComboEdge Tanto Blade Length (inches): 4.40 Blade Material: 400 Black Carry System: Pocket Clip Handle Material: Aluminum Lock Style: Liner Lock Overall Length (inches):&nb…

MAGLITE ASXD026 D-Cell Flashlight Mounting Bracket $2.34 2 Pack Auto Clamp, Holds Any D Cell Mag Aluminum Flashlight To A Flat Surface, Includes Mounting Screws….