Adjustable chair headrest

An adjustable chair headrest, comprising a support rod (3) connected to a chair back, and a headrest (1), wherein the adjustable chair headrest further comprises an elastic sliding mechanism connecting the headrest (1) and the support rod (3), the elastic sliding mechanism is provided with a lock mechanism used for defining a fixed distance between the headrest (1) and the support rod (3), and comprises a stop block (4) disposed on a horizontal rod body at a top of the support rod (3), a sliding push rod (2) slidably connected to the stop block (4), and a tension spring (6) connecting the sliding push rod (2) and the stop block (4) to form an elastic telescoping mechanism by the sliding push rod (2) and the stop block (4), and an end, away from the stop block (4), of the sliding push rod (2) is connected to the headrest (1) through a damping hinge;

• the stop block (4) is located above the sliding push rod (2), and is detachably connected to the support rod (3) to be received in a groove formed in the horizontal rod body of the support rod (3), an end, away from the headrest (1), of the sliding push rod (2) stretches into the groove of the support rod (3), a gap is reserved between the sliding push rod (2) and an end, close to the headrest (1), of the stop block (4), the tension spring (6) is disposed in the gap and has an end disposed around an end, close to the support rod (3), of the sliding push rod (2) as well as an end disposed around the end, close to the headrest (1), of the stop block (3), and a cover (5) is disposed on the stop block (4) to cover the groove of the support rod (3).