| 摘要 |
A back (1) of a motor vehicle seat has a headrest (8) and a main back portion comprising a peripheral frame (2). A back support element in the form of a net (4) is located within the frame (2). Substantial rearward movement of the net (4) is initially prevented, but in response to circumstances that arise during a rear impact the net (4) is permitted to move rearwardly. Thus, during a rear impact, the torso of a person sitting on the seat will move rearwardly relative to the seat, bringing the head of the person into contact with the head-rest (8) thus minimising any risk of whiplash neck injury. Initial rearward movement of the net may be limited by elements such as straps (3) which yield in a non-elastic manner when subjected to a force in excess of a predetermined limit, such as would be experienced during rear impact. Alternatively, the straps may be connected to the frame by connectors (9) which respond to a sensed deceleration in excess of a predetermined limit to release the straps (3).
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