Patent ID: 8100472

Claim:
A vehicle seat comprising: a frame providing structure for a seat back within a vehicle; an active head restraint system supported by the frame for moving to an extended position when the active head restraint system is activated, the active head restraint system having a linkage to lock in the extended position; and a head restraint oriented above the seat back of the frame, the head restraint being moveable relative to the frame by the active head restraint system to the extended position to provide support to the head of the occupant during an impact condition, wherein the linkage of the active head restraint system further comprises: a first link adapted to be pivotally connected to the frame; a second link pivotally connected to the first link and the head restraint; and a locking member pivotally connected to the first link and the second link to lock the second link relative to the first link, wherein the first link and the second link guide the head restraint to the extended position and the locking member and the second link collectively lock the head restraint in the extended position.