HEADREST FOLDING MECHANISM

The present invention discloses a headrest folding mechanism, comprising a support (1) and a rotation shaft crossbar (3), a lower part of the support (1) being fitted round the rotation shaft crossbar (3) and rotatable about the rotation shaft crossbar (3); a locking member (6) is fitted round the rotation shaft crossbar (3) in a fixed manner, and a return torsion spring (8) is fitted round the rotation shaft crossbar (3); a middle crossbar parallel to the rotation shaft crossbar (3) is fixed to a middle part of the support (1); a locking torsion spring (7), a locking ratchet (4), an unlocking ratchet (5) and an unlocking torsion spring (14) are fitted round the middle crossbar (2) in sequence; the locking ratchet (4) and the unlocking ratchet (5) are arranged side by side in such a way as to move in linkage, and an unlocking pull member is provided on the locking ratchet (4) or the unlocking ratchet (5); in a locked state, side walls of the locking ratchet (4) and the unlocking ratchet (5) both abut a side wall of the locking member (6); to unlock, the unlocking pull member is pulled, and the side walls of the locking ratchet (4) and the unlocking ratchet (5) disengage from the side wall of the locking member (6). The locking ratchet (4) and the locking member (6) are used to realize locking of the headrest mechanism with two locking pieces, so the headrest folding mechanism has superior dynamic collision safety performance, while also being adaptable to different forms of unlocking.