| 摘要 |
FIELD: materials shipment. SUBSTANCE: container is made of flexible sheet material to provide box shape. It has side and end face walls and upper cover consisting of made-integral folds on side and end face walls. End face walls have vertical central bending lines. When bending the folds of side walls for overlapping to form upper cover, folds of end face wall form triangular wings projecting outwards. Triangular wings are bent downwards overcoming the increasing resistance until definite angle of downwards deflection below the horizontal line is obtained, after which end face walls are bent inwards along lines of bending to allow side walls meet to decrease resistance and create effort tending to tilt wings downwards to bring them into engagement with end face walls. EFFECT: possibility of holding wings on end face walls and folds of side walls of upper cover closed. 12 cl, 30 dwg:
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