Patent ID: 8403417

Claim:
An armrest structure comprising: a cover ( 1 ); a controlling member ( 2 ) having a spring ( 23 ) and a pressing portion ( 21 ) located on one side thereof, a rack portion ( 24 ) formed on the other side of the controlling member ( 2 ); a sliding plate ( 3 ) having a sliding protrusion ( 31 ) at an underside thereof and multiple teeth ( 32 ) formed on a side of the sliding plate ( 3 ) so as to be engaged with the rack portion ( 24 ); a fixing plate ( 4 ) having a sliding groove ( 42 ) defined therein and the sliding protrusion ( 31 ) slidably engaged with the sliding groove ( 42 ); a fixing device ( 5 ) having a sliding area ( 51 ) on a top thereof and two first rails ( 52 ) respectively located on two sides of the fixing device ( 5 ), the sliding plate ( 3 ) engaged with the first rails ( 52 ), the fixing device ( 5 ) having a recessed area ( 53 ) defined in a center thereof and the fixing plate ( 4 ) located in the recessed area ( 53 ), the recessed area ( 53 ) having a slot ( 54 ) defined therein, the fixing device ( 5 ) having multiple engaging teeth ( 55 ) on a side thereof so as to be engaged with the rack portion ( 24 ) of the controlling member ( 2 ), two guide grooves ( 56 ) defined in an underside thereof; a base ( 6 ) connected with the cover ( 1 ) and having an opening ( 62 ) defined centrally therethrough and the recessed area ( 53 ) located in the opening ( 62 ), the base ( 6 ) having two second rails ( 63 ) which are engaged with the two guide grooves ( 56 ), and a height adjustment device ( 7 ) connected to the slot ( 54 ) of the fixing device ( 5 ) and fixed to the fixing plate ( 4 ).