| 摘要 |
PROBLEM TO BE SOLVED: To provide an antiburglary lock structure for a sash window capable of attaching an auxiliary lock very easily, opening and closing the sash window easily from an inner side with the attached auxiliary lock, and preventing its opening unless the sash window is destructed and having excellent antiburglary property. SOLUTION: A crescent 17 is attached to a window vertical frame of the inner so as to form a clearance between the outer face S of the frame and the lock when the auxiliary lock 25 is attached and a screw 20 is loosened. The auxiliary lock 25 attaches a lock fixing plate 26 to be tightened on the vertical frame of the inner window together with the crescent by inserting it into the clearance to an auxiliary lock main body 28. The auxiliary lock main body holds a dead bolt 29 so as to move it to a locking position and an unlocking position crossing rotation locus of the crescent orthogonally, incorporates a cylinder lock (locking and unlocking means) for switching and moving the dead bolt to the locking position and the unlocking position, and inserts a key 30 for operating the locking and unlocking means so as to insert and pull it out freely to regulate unlocking operation of a crescent lock 15 by the dead bolt.
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