PROBLEM TO BE SOLVED: To simply and firmly assemble a bottom plate, side plates, and end plates of a development sheet consisting of a reinforced corrugated board into a box shape, and even after assembling them once, simply return them into a developed state.SOLUTION: This corrugated board coffin 10 is assembled into a box-shaped coffin body 12 including the bottom plate 12a, side plates 12B, and the end plates 12C by folding the development sheet along V-grooves. The side plates 12B and 12B are approximately perpendicularly folded relative to the bottom plate 12A into rectangular plates, and the end plates 12C are formed into rectangular plate faces by mutually adjoining bottom end plates 12Ca approximately perpendicularly folded relative to the bottom plate 12A and side end parts 12Cb and 12Cb approximately perpendicularly folded relative to the left/right side plates 12B and 12B. Each end plate 12C is downwardly mounted with a flush bolt member 15 for locking the front/rear directional development of the bottom end part 12Ca and the left/right side end parts 12Cb and 12Cb and locking the left/right-directional development of the side end parts 12Cb and 12Cb.COPYRIGHT: (C)2009,JPO&INPIT【課題】強化段ボール板からなる展開シートの底板、側板および妻板を、簡単かつ強固に箱状に組み立て、かつ、一旦組み立てた後でも簡単に展開状態に戻せるようにする。【解決手段】段ボール棺10は、展開シートをV溝に沿って折り曲げて底板12A、側板12Bおよび妻板12Cを含む箱状の棺本体12が組み立てられる。側板12B,12Bは、底板12Aに対してほぼ垂直に折り曲げられて矩形の板面を形成し、妻板12Cは、底板12Aに対してほぼ垂直に折り曲げられる底妻部12Caと、左右の側板12B,12Bに対してほぼ垂直に折り曲げられる側妻部12Cb,12Cbとが互いに隣接して矩形の板面を形成する。妻板12Cには、底妻部12Caと左右の側妻部12Cb,12Cbの前後方向の展開をロックし、かつ、側妻部12Cb,12Cbの左右方向の展開をロックする落とし錠部材15が落とし込まれる。【選択図】図3
