Patent ID: 8020930

Claim:
A coupling mechanism for a headrest of a vehicle seat, comprising: a backrest frame; a headrest; a lower movable member attached movably to the backrest frame so as to be movable backward as a result of a rear end collision; an upper movable member attached movably to the backrest frame for supporting the headrest; and a coupling mechanism for transmitting a backward movement of the lower movable member to the upper movable member, wherein the coupling mechanism includes a pair of upper link mechanisms coupled to right and left ends of the upper movable member, and a pair of lower link mechanisms coupled to right and left ends of the lower movable member, the lower link mechanisms are coupled to the upper link mechanisms by way of a coupling rod, and the upper link mechanisms amplify a backward moving amount of the lower movable member, and move the headrest forward; wherein each upper link mechanism has a first long link having an upper end part for fixing an end part of the upper movable member, an arm pivoted on the backrest frame and coupled to an intermediate part of the first long link, and a second link pivoted on the backrest frame and having a first end part to be coupled to a lower end part of the first long link by means of a first shaft, and wherein an upper end of the coupling rod is coupled to a second end part of the second link by way of a second shaft.