PROBLEM TO BE SOLVED: To provide a backrest that is portable and that has a spine correction function.SOLUTION: The backrest is manufactured by integral molding using a plasticized material, and is provided with a back support plate 40 including an upper part 41 and a lower part 42 from top to bottom along the vertical direction. A circular measure inside the vertical cross section in the center along the vertical direction of the upper part 41 coincides with the circular measure of the thoracic spine of a human body, showing a curve that matches the thoracic kyphosis. A circular measure inside the vertical cross section in the center along the vertical direction of the lower part 42 coincides with the circular measure of the lumbar spine of a human body, showing a curve that matches the lumbar lordosis. The joining part of the upper part 41 and the lower part 42 is extended to both left and right sides of the joint part adjacent to the bottom end of the thoracic spine and the apex of the lumbar spine in the back of the human body. As the backrest 30 has a simple structure and occupies no space, when a user sets the backrest 30 on the backrest part of a chair to sit on the chair, a sufficient space is secured. Also, the back support plate 40 accurately and fully supports the thoracic spine and the lumbar spine of the user from top to bottom, materializing the purpose of making a fine adjustment of the thoracic spine and the lumbar spine to the accurate position.COPYRIGHT: (C)2015,JPO&INPIT【課題】携帯型で脊椎矯正機能を有する背もたれを提供する。【解決手段】可塑性材料により一体成形で製造され、垂直方向に沿い上から下にかけ上部41及び下部42を含む背部支持板40を備える。上部41の垂直方向に沿う中央の縦の断面の内側の弧度は人体の胸椎の弧度と一致し、胸椎脊柱後湾に合わせた曲線を呈する。下部42の垂直方向に沿う中央の縦の断面の内側面の弧度は人体の腰椎の弧度と一致し、腰椎脊柱前湾に合わせた曲線を呈する。上部41及び下部42の接合箇所は人体の背面の胸椎の底端及び腰椎の頂端に隣接する関節部位の左右両側まで延伸される。背もたれ30は構造が単純で、空間を占領しないため、ユーザーが背もたれ30を椅子の背もたれ部に設置して椅子に座る際に十分な空間を確保する。また、背部支持板40は上から下にかけユーザーの胸椎及び腰椎を正確且つ完全に支持し、胸椎及び腰椎を正確な位置へ微調整する目的を実現する。【選択図】図4
