Abstract: A lumber support apparatus may include a base plate installed in a fixed wire installed in seatback frame to be elevated, nut units having left and right nuts coupled to upper portions of opposite sides of the base plate to be slid leftwards and rightwards, respectively, link units having left and right links located outside the nut units to be spaced apart from each other and ends of which are hinge-coupled to upper portions of opposite sides of the base plate, respectively, arm units having left and right arms leftward/rightward movements of which are restricted by the link units and raised forwards and rearwards when the nut units are slid, and a screw rod having a screw structure passing the left and right nuts leftwards and rightwards to be screw-coupled to the left nut and right units, for moving the left and right nuts in opposite directions during rotation thereof.

Abstract: A lumber support apparatus may include a base plate installed in a fixed wire installed in seatback frame to be elevated, nut units having left and right nuts coupled to upper portions of opposite sides of the base plate to be slid leftwards and rightwards, respectively, link units having left and right links located outside the nut units to be spaced apart from each other and ends of which are hinge-coupled to upper portions of opposite sides of the base plate, respectively, arm units having left and right arms leftward/rightward movements of which are restricted by the link units and raised forwards and rearwards when the nut units are slid, and a screw rod having a screw structure passing the left and right nuts leftwards and rightwards to be screw-coupled to the left nut and right units, for moving the left and right nuts in opposite directions during rotation thereof.