Patent ID: 7549704

Claim:
A headrest adjusting structure for a seat, comprising a headrest adjusting assembly to be combined with a headrest and installed on an upper end of the seat and characterized in: the headrest adjusting assembly comprising a base and a rotating support, wherein the base is formed with a groove for receiving a supporting portion formed at an end of the rotating support, and the supporting portion has outwardly opening cavities, each of which can receive therein a positioning disk having a plurality of recesses on a side surface thereof and at least one protrusion on a periphery of the positioning disk for engaging with a corresponding dent formed on the supporting portion; the base further having outwardly opening accommodating spaces on two sides thereof, respectively, wherein each of the accommodating spaces is formed with an aperture on a surface thereof for receiving a ball and a resilient element, in which each of the balls has an end engageable in one of the recesses on one of the positioning disks mounted in the rotating support while a pressing plate is fitted in each of the accommodating spaces to retain the resilient element and the ball, a threaded fastener being penetratingly coupled with the pressing plates fitted in the accommodating spaces on the two sides of the base, the base and the supporting portion formed at one end of the rotating support, and further combined with a nut to position and hold together the pressing plates, the base and the supporting portion; and an outer cap being mounted on each of the accommodating spaces formed on the two sides of the base; and a headrest adjusting assembly thus formed being installed on the seat so that the headrest combined to an end of the headrest adjusting assembly can be easily adjusted to a preferred position by manually pulling the rotating support.