VENTILATION LOCK DEVICE FOR DOUBLE SLIDING SCREEN

摘要

PROBLEM TO BE SOLVED: To strengthen the crime prevention function of the ventilation lock device for a double sliding screen and improve the appearance when it is not used. SOLUTION: A first locking body 7 provided with a drawing arm 12 is provided in the lock seat 4 of a crescent lock 2. A second locking body 8 provided with a fixing pin 16 is provided at the side of the lock body 3. The fixing pin 16 is retractably operated by a changeover tool 25 to be displaced in a position to engaging with the drawing arm 12 or a waiting position. A changeover locking tool 17 is provided in order to prevent the changeover tool 25 from being dishonestly operated form the outdoor side, in a ventilation condition. In the changeover locking tool 17, a regulating body 35 is pushed by the shaft 11 of the drawing arm 12 side only in a condition that the right and left window 1A, 1B are closed and the changeover tool 25 can be changed over to the waiting position.