| 摘要 |
PROBLEM TO BE SOLVED: To prevent inferiority in crime preventing performance in a conventional lock structure of middle folding double opening sashes in which the sash is locked at one position only on each of the upper and lower side to cause rattling of the sash when locked. SOLUTION: In a lock device to hold the middle folding double opening sashes in a closed state, lock members are provided to be capable of protruding and retracting on the right and the left side at an upper and a lower part of the sashes on the opening side, and receiving parts for the lock members are provided in an upper frame and a lower frame, respectively for the middle folding double opening sashes facing the lock members.
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