| 摘要 |
A headrest for seats in a vehicle or a different transportation means. The headrest includes a light head cushion (1) and a heavier, movable element (3), which both are fastened to the vehicle's chassis in a movable manner. The headrest also includes a mechanical connection (6), e.g. in the shape of at least one gear wheel (11) and threaded surfaces connected to the head cushion (1) and to the movable element (3), which mechanical connection (6) interlinks the heavy element (3) and the easy head cushion (1) in such a manner that when the heavy body (3) is accelerated, e.g. due to a collision, then the lighter head cushion (1) will move but in the opposite direction. According to one specific embodiment of the invention the head cushion may also be provided with a one-way acting attenuator which results in an easy movement of the head cushion in one direction, while a returning movement towards the rest position only takes place against a substantial attenuation or friction force. The object of the invention in particular is to provide a dynamic head rest which due to mass forces caused by, e.g. a collision, automatically reduces the distance between the head of the user and the headrest, and accordingly reduces neck damage.
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