Headrest

Claim 1

A headrest whose position can be adjusted by moving its body forward and rearward in a horizontal plane in relation to a seat back of a seat comprising: a support stay in an upper portion of the seat back of the seat; a headrest body located at an upper portion of the support stay; a link mechanism including a first forward swing link member and a second rear swing link member located between the headrest body and a support means for supporting the headrest body swingably in relation to the support stay; a lock mechanism located inside the headrest body, between the support stay and the support means for allowing said support means to freely swing in accordance with movement of the headrest body in one direction and to limit swinging movement of the support means against movement in another direction of the headrest body, said lock mechanism including a sector having a plurality of teeth provided on one of the swing link members, said lock mechanism utilizing a pivot shaft of the attached swing link member for its rotation center, and a click member movably attached to one of the support stay and headrest body, the click member having a click engageable with the teeth of the sector; a lock release mechanism for releasing the lock mechanism when the headrest body is at a stop end of a moving stroke; and a bracket fixed to the headrest body through a headrest frame on which the upper portions of the forward and rear swing link members are pivoted, respectively; wherein base portions of the link members are pivoted on the upper end of the support stay and are erected parallel to each other from the upper end of the support stay; and the sector of the lock mechanism is integrally formed on one of the forward and rear swing link members.