Patent ID: 7887135

Claim:
A headrest device in a chair, comprising: a headrest; a headrest frame extending upward from a backrest support frame over which a backrest is mounted, the headrest frame comprising a pair of side rods; a vertical guide rail on each of the pair of side rods of the headrest; and a u-shaped elevating bracket on the headrest, a vertical front guide groove and a plurality of engagement grooves being formed on one of the guide rail and elevating bracket, an elastic portion being provided on the other and having a vertical projection that slides in the front guide groove and an engagement projection that selectively engages in one of the engagement groove, wherein the front guide grooves and the plurality of engagement grooves are formed on a front face of the guide rail, the U-shaped elevating bracket sliding up and down to hold the guide rail, the elastic portion that projects from a rear face of the elevating bracket pressing a front face of the guide rail to allow a pair of guide projections projecting from an inner side surface of the elevating bracket to slip up and down in a side guide groove on each side of the guide rail, and wherein the side guide groove of the guide rail is open at a lower end, the lower end of the front guide groove of the guide rail being higher than the lower end of the side guide groove.