| 摘要 |
A lock member L1 including an operation portion L1a and a lock bar L1b is disposed on each of first opposite side walls 2 to be brought down firstly toward a bottom portion 1, and a pivotal shaft 13 formed in the operation portion is pivotally supported in a bearing hole 2g2 formed in each of the first opposite side walls to be brought down firstly toward the bottom portion. To allow cancellation of a lock state between the lock member and each of second opposite side walls to be brought down secondly toward the bottom portion, the operation portion is pivotally moved downward. During an unlocking operation, even when an operator pivotally moves the operation portion included in the lock member, the operation portion is prevented from being tilted. Thus, the lock bar of the lock member can be used to reliably perform the unlocking operation.
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