Vehicle seat back with active head restraint

摘要

A vehicle seat back (22) is disclosed having an active head restraint (24) movably mounted on it. An actuating member (60) is positioned in the seat back to be impacted and moved in a rearward direction by the back of an occupant of the seat in the event of a vehicle collision. A mechanical linkage between the actuating member and the head restraint causes forward movement of the head restraint from a rest position in response to rearward movement of the actuating member. In the invention, a retarding mechanism (68) powered by the impact between the back of the seat occupant and the actuating member acts to retain the head restraint forward of the rest position for a length of time after a force has ceased to be applied by the back of the seat occupant to the actuating member.