PROBLEM TO BE SOLVED: To provide an upright plate, a hot-water supply bag, a bottom plate, an intermediate plate, and a reverse concave shaped member, which are used for a knockdown bathtub.SOLUTION: An engaging plate having an engaging part on both ends is freely rotatably connected to the lower part of an upright plate. The engaging parts are oppositely faced and freely engaged and disengaged. A hot-water supply bag is composed by developing in a freely standing manner one wall of a rectangular measure shape. A bottom plate is formed by freely rotatably connecting frame-shaped members into an inside frame, a front frame, and a pendent frame. An intermediate plate is provided with an engaging part at both ends and made freely engaged and disengaged with an intermediate engaging part installed in the pair of engaging parts. A plurality of upright plates are erected by projecting the engaging plate inward and positioning flat on a plane and fixed by relatively engaging the respective engaging parts with the adjacent engaging parts to form a wall surface. By making the developed one wall of the hot-water supply bag stand up and internally installing on the wall face, the front frame and the pendent frame of the bottom plate are folded upright, with the intermediate frame fixed on the upper face of the bottom inside the hot-water supply bag.COPYRIGHT: (C)2014,JPO&INPIT【課題】本発明は、組み立て浴槽に用いる立設板と給湯袋と敷板と中間板と逆凹形状部材を提供する。【手段】両端に掛止部を有する掛止板を立設板の下方に回転自在に接続し、掛止部は相対して掛止離反自在で、給湯袋は方形升形状の一方壁を起立自在に展開して構成し、敷板は額縁形状部材を回転自在に接続して中置枠と前方枠と垂下枠とし、中間板は両端に掛止部を設け一対の前記掛止部に設けた中間掛止部と掛止離反自在とし、掛止板を内側に突出して平面上に平坦に位置して複数の立設板を立設し、それぞれの掛止部を隣接する前記掛止部と相対掛止して立設板を固定して壁面を構成し、給湯袋の展開した一方壁を起立して壁面に内装し、敷板の前方枠と垂下枠を起立折畳して中置枠を給湯袋内側底部上面に定置する。【選択図】 図1
