PROBLEM TO BE SOLVED: To facilitate processing of spread paper by a cutting machine by reducing a developed length, and to preferably keep a degree of precision and strength at connecting corner parts between a bottom plate and an end plate.SOLUTION: The spread paper P1 of a coffin body 12 has side plates 12B beyond longitudinal V grooves y1 on both sides in the transverse direction of the bottom plate 12A and lower end plates 12C beyond transverse V grooves x1 on both sides in the longitudinal direction. Upper end plates 12D, 12D are provided beyond transverse V grooves x2 at positions where opening end parts of the side plates 12B are extended in the longitudinal direction. The longitudinal dimension of the upper end plates 12D, 12D is set at a length shorter than the height dimension of the coffin body 12. When the spread paper P1 is assembled, the side plates 12B and the lower end plates 12C are folded along the longitudinal V grooves y1 and the transverse V grooves x1 relative to the bottom plate 12A, and the upper end plates 12D, 12D are folded along the transverse V grooves x2 relative to the side plates 12B so that the lower end plates 12C and a pair of the upper end plates 12D, 12D are connected on the same plane.COPYRIGHT: (C)2008,JPO&INPIT【課題】展開長を抑えて切削加工機による展開紙の加工を行い易くし、底板と妻板との連結角部における精度および強度を良好に保つ。【解決手段】棺本体12の展開紙P1は、底板12Aの横方向両側に縦V溝y1を隔てて側板12Bが設けられ、縦方向両側に横V溝x1を隔てて下部妻板12Cが設けられる。側板12Bの開口端部を縦方向に延長する位置には、横V溝x2を隔てて上部妻板12D,12Dが設けられる。上部妻板12D,12Dの縦寸法は、棺本体12の高さ寸法より短い長さに設定される。展開紙P1の組み立て時には、底板12Aに対して側板12Bおよび下部妻板12Cを縦V溝y1および横V溝x1に沿って折り曲げ、側板12Bに対して上部妻板12D,12Dを横V溝x2に沿って折り曲げることにより、下部妻板12Cと、一対の上部妻板12D,12Dとが同一面上に連結される。【選択図】図3
