| 主权项 |
1. A packaging box comprising:
a body part having a rectangular bottom plate and side plates erected from four sides of the bottom plate, and provided with an opening at an upper face; flaps connected to upper edges of the side plates via fold lines to close the opening by being folded the opening side; a buffer interposed between the body part and a packaged article; and a square pillar reinforcing frame being located inside the body part and surrounding the packaged article, wherein the buffer has an engaging groove formed so as to grip the side plates and the flaps folded up outsides of the side plates by being folded back an opposite side of the opening side along the fold lines, wherein the engaging groove has a shape engageable with a corner of the reinforcing frame,
when packing, the buffer is interposed between the reinforcing frame and the side plates at a corner of the body part by engaging the engaging groove with the corner of the reinforcing frame, andwhen opening, the buffer grips and fixes two adjacent side plates and the flaps folded up the outsides of the two side plates, by being folded back and up the outsides in the engaging groove along the fold lines, wherein the buffer has an inner periphery part set above the packaged article when being packed and an outer periphery part interposed into a gap between the reinforcing frame and the lateral plate when being packed, the engaging groove is formed between the inner periphery part and the outer periphery part, a pair of the buffers arranged at corners on at least one diagonal line of the body part is formed so that a length of the inner periphery part projected inwardly from the reinforcing frame in the same direction as a width direction of the gap when being packed is smaller than a width of the gap. |
