Patent ID: 8128172

Claim:
An armrest assembly, comprising: an armrest support; a mounting sleeve movably mounted on the armrest support; an armrest mounted on the mounting sleeve to move in concert with the mounting sleeve; and a lifting device mounted between the armrest support and the mounting sleeve and operable between a first position where the lifting device is locked to lock the mounting sleeve onto the armrest support and a second position where the lifting device is unlocked to unlock the mounting sleeve from the armrest support so that the mounting sleeve is movable relative to the armrest support freely to adjust a relative position between the mounting sleeve and the armrest support; wherein the lifting device includes: a housing secured in the armrest support and having a first side formed with an elongate slideway which has a sidewall formed with a plurality of locking grooves and a second side formed with an elongate guide slot; an adjusting shank movably mounted on the housing and secured in the mounting sleeve to move in concert with the mounting sleeve; a pivot member mounted on a first side of the adjusting shank to move in concert with the adjusting shank and having an upper end pivotally mounted on the adjusting shank and a lower end provided with a locking rod movable in the slideway of the housing and detachably locked in one of the locking grooves of the housing; an elastic member mounted on the first side of the adjusting shank and biased between the adjusting shank and the pivot member to push the locking rod of the pivot member toward one of the locking grooves of the housing; a limit rod mounted on a second side of the adjusting shank to move in concert with the adjusting shank and movable in the guide slot of the housing; and a limit plate movably mounted on the first side of the adjusting shank and connected with the locking rod of the pivot member to drive the locking rod of the pivot member to detach from the locking grooves of the housing.