How does the “Head and Neck” system save lives? The HANS essentially works like an airbag. But instead of inflating a cushion to arrest occupant motion in a collision, it uses a raised collar and two polyester-fabric tethers to secure the driver’s head. The driver’s shoulder belts hold the tall, stiff collar securely in place. The tethers link the sides of the driver’s helmet to collar anchor points. When g-loads build during a forward impact, the HANS device assures that the driver’s helmeted head moves with his torso so vulnerable neck and skull bones aren’t overloaded. The above sled-test drawings show the HANS at work. With only a neck to restrain it, a 15-pound helmeted head lunges forward at 107 g during a 40-g head-on collision. Resulting “shear” (two opposing forces perpendicular to the neck’s axis) and “tension” (pulling force along the neck axis) loads vastly exceed the injury threshold, making death more likely. The restraint provided by the HANS device reduces neck tension by 81 percent, shear by 72 percent, and the total neck load by 78 percent. The head experiences a tolerable 62 g. Because the driver’s head and neck motion is now in synch with his torso’s movement, chest g-forces rise slightly, though chest compression is reduced. Source
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How does the “Head and Neck” system save lives?

The HANS essentially works like an airbag. But instead of inflating a cushion to arrest occupant motion in a collision, it uses a raised collar and two polyester-fabric tethers to secure the driver’s head. The driver’s shoulder belts hold the tall, stiff collar securely in place. The tethers link the sides of the driver’s helmet to collar anchor points. When g-loads build during a forward impact, the HANS device assures that the driver’s helmeted head moves with his torso so vulnerable neck and skull bones aren’t overloaded.

The above sled-test drawings show the HANS at work. With only a neck to restrain it, a 15-pound helmeted head lunges forward at 107 g during a 40-g head-on collision. Resulting “shear” (two opposing forces perpendicular to the neck’s axis) and “tension” (pulling force along the neck axis) loads vastly exceed the injury threshold, making death more likely.

The restraint provided by the HANS device reduces neck tension by 81 percent, shear by 72 percent, and the total neck load by 78 percent. The head experiences a tolerable 62 g. Because the driver’s head and neck motion is now in synch with his torso’s movement, chest g-forces rise slightly, though chest compression is reduced.

Source

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