| 摘要 |
PROBLEM TO BE SOLVED: To prevent a coupling of a side plate from being broken even if strong external force works on an upper frame or a bottom plate while being folded by forming a coupling hole of a side plate coupling shaft provided on the upper frame and the bottom plate so that a movable range of the side plate coupling shaft is larger than an engaging size of engaging recess and protrusion. SOLUTION: Engaging recess and protrusion 12,13 which engage with each other at the time of folding a container are provided at predetermined portions to be opposite faces of an upper frame 2 and a bottom plate 3. A length of coupling holes 16, 17 of a hinge 4 coupling between the upper frame 2 and an upper side plate 7 and a hinge 5 coupling between the bottom plate 3 and a lower side plate 8 is set so that a movable range of coupling shafts 14, 15 is larger than an engaging size of the engaging recess and protrusion 12, 13. Therefore, even when external force is applied so that the engaging recess and protrusion may disengage due to a shock or the like at the time of dropping, the coupling shafts 14, 15 can move in the coupling holes 16, 17 thereby absorbing the external force, so that no deformation and breakage occurs on the upper frame 2, the bottom frame 3, the respective couplings or the like.
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