Patent ID: 7118174

Claim:
An activating headrest comprising: a headrest; a detecting link integrally linked to said headrest and pivotally mounted to a seat frame to pivot in a vertical pivoting range plane when pressed by a back of an occupant, wherein said detecting link comprises: a headrest supporting pipe into which a headrest rod, protruding out at said headrest, is inserted; a horizontal rod for being fixed with the lower end of said headrest supporting pipe; a pair of pivot arms installed at both ends of said horizontal rod; a detecting rod protruded underneath said horizontal rod, wherein said detecting rod has a plurality of fixing holes at a constant interval; and a detecting plate installed at said detecting rod, wherein said detecting plate is integrally mounted with an insertion pipe for allowing said detecting rod to be inserted therein; wherein said insertion pipe has a location determining hole and a welding nut, and said welding nut is fastened with a fixing bolt for fixing the location of said detecting plate in relation to said detecting rod; a return spring installed between said detecting link and said seat frame; and means, installed between said seat frame and said detecting link, for fixing a state of said headrest which has been shifted in a forward and upward position, wherein said means for fixing a state of the headrest comprises: a slider of which a sliding surface contacts with said detecting link in relation to a pivoting direction of said detecting link being pivoted by the occupant's back, and which prevents said detecting link from pivoting to a direction opposite the pivoting direction; a linear guide fixed to said seat frame for guiding a linear movement of said slider in a direction perpendicular to the vertical pivoting range plane of said detecting link; and a slider spring for resiliently supporting said slider.