Patent ID: 8474914

Claim:
An armrest adjustment device comprising an armrest disposed on a top surface of an armrest support and a lower part of the armrest support is connected to a chair seat; the armrest is able to be adjusted forward and backward in relation to the chair seat; wherein the armrest includes: an armrest pad; an armrest base assembled with the armrest pad to form an armrest body having a rectangular space therein; an opening is mounted on one side of the armrest; symmetrical slots are arranged at a middle part of the armrest base along the same direction of movement of the armrest; a gap is mounted on an inner side of the armrest base and is aligned with the opening; a mounting slot with a projecting piece on one side is arranged at the armrest base; a first component mounted inside the armrest body; the first component is disposed with two posts, a positioning member and a plurality of grooves arranged at regular intervals; the two posts are respectively arranged at a front part and a rear part on a bottom surface of the first component; each of the two posts passes through one of the symmetrical slots on the middle part of the armrest base to be assembled with and fixed on the armrest support correspondingly; a damping part that is mounted in the mounting slot of the armrest base and is against the positioning member for providing damping effects; and a press member passing the opening of the armrest base and mounted in the armrest body; a press part is on one end of the press member while an elastic part is arranged at the other side and the elastic part is elastically against the projecting piece on the side of the mounting slot of the armrest base; an open slot with an opening facing upwards is set between the press part and the elastic part; at least one projective body is disposed on a bottom of the open slot near the side of the elastic part while a channel is formed on the bottom of the open slot near the press part; wherein when the press member is pressed and moved inward elastically, the groove of the first component is corresponding to the channel of the press member and is able to be moved along the channel; wherein while the press member is released and moved outward elastically, the grooves of the first component are engaged with the at least one projective body of the press member.