Patent ID: 7044550

Claim:
A rear seat having a backrest implemented with a back board, comprising: a seat cushion; a hinge bracket rigidly fixed to a side of said seat cushion; a backrest rotatably engaged with said hinge bracket; a first link member whose proximal end is rotatably coupled to said hinge bracket; a second link member whose proximal end is rotatably connected to a distal end of said first link member; a sliding member connected to a distal end of said second link member; a rail member for accommodating said sliding member therein, the rail member being installed to a side of said backrest; an elastic member whose one end is coupled to said sliding member and the other end is coupled to an upper end of said rail member, the elastic member being compressed or extended in said rail member in accordance with a movement of said sliding member; a back board integrally formed with said sliding member; and a stopper formed adjacent to a lower end of said backrest, said stopper restraining rotation of said first link member within a certain limit.