Width 1000 mm ( assigned to the seat and backrest ) custom folding sofa bed , folding ratio is much comfortable to sit up ? According to ergonomics, the depth of the seat is usually 375 ~ 400mm appropriate. If the seat is too deep , can not sit back . General recommendations multipurpose chair depth should not exceed 430mm.
seat height of 380mm ~ 540mm allows the upper part of the body feels comfortable. Taking into account the space when folded sofa bed was a sofa folds will form part due to bending , so the ratio is set to approximately 4 : 6 should be suitable.
information and data from the "interior ergonomics ."