| 摘要 |
A headrest for motor-vehicle seats comprising a yielding body and a pair of support rods having positioning notches cooperating with respective resilient locking members which can normally be released to enable height adjustment of the headrest. An inertial mass is associated to at least one of the resilient locking members, which is normally kept in an inoperative condition and is movable, upon application to the headrest of a force exceeding a preset threshold value, to an operative condition in which the at least one resilient locking member is made unreleasable relative to the positioning notches of the related support rod.
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