Patent ID: 8714650

Claim:
A seat assembly comprising: a seat back; and a head restraint assembly disposed on the seat back, the head restraint assembly including: a support post; and a headrest disposed on the support post, wherein the headrest has a mounting unit that receives the support post, first and second housings that are disposed under a trim cover and that receive the mounting unit and move with respect to the mounting unit and support post, and a lock device that extends through the mounting unit, wherein the lock device includes a latch engagement arm and a release arm that both extend toward the first housing from a base and that do not move with respect to each other, wherein force exerted by the first housing on the release arm moves the lock device toward the second housing to an unlocked position in which the latch engagement arm disengages a latch and wherein force exerted by the second housing on the base moves the lock device toward the first housing to a locked position; wherein the headrest is inhibited from moving away from a head of a seat occupant until the headrest is actuated toward the head of the seat occupant.