A vehicle seat assembly that includes a seatback frame and an active head
restraint system operatively supported by the seatback frame. The active
head restraint system includes an upper armature moveably mounted to the
seatback frame and a head restraint mounted to the upper armature. The
active head restraint system also includes a lower armature operatively
attached to the upper armature. The lower armature is operable to move
toward the upper armature in response to a predetermined force applied to
the lower armature and act on the upper armature to move the head
restraint toward the occupant.