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HANS device
A HANS device (Head and Neck Support device), also known as a head restraint, is a safety item compulsory in many car racing sports. It reduces the likelihood of head and/or neck injuries, such as a basilar skull fracture, in the event of a crash.
==Description==
Primarily made of carbon-fiber, the HANS device is shaped like a U, but with the back of that U set behind the nape of the neck and the two arms lying flat along the top of the chest over the pectoral muscles. The device, in general, is supported by the shoulders. It only is attached to the helmet, and not to the belts, the driver's body, or the seat; the helmet is attached to the device with the help of two anchors on each side, much like the Hutchens device but placed slightly back. In a properly installed 5 to 6-point racing harness, the belts that cross the driver's upper body directly pass over the HANS device on the driver's shoulders and they buckle at the center of the driver's abdomen. Therefore, the HANS device is secured with the body of the driver, not the seat.
The purpose of the HANS device is to keep the head from whipping forwards and backwards in a crash, without otherwise restricting movement of the neck. In any kind of crash, the person's body, which isn't protected, is decelerated by the seatbelt with the head maintaining velocity until it is decelerated by the neck. The HANS device maintains the relative position of the head to the body, in addition to transferring energy to the much stronger chest, torso, shoulder, seatbelts, and seat as the head is decelerated.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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