| 摘要 |
PROBLEM TO BE SOLVED: To provide a double lock tool which is simple in structure and easy to be handled, and improved in crime prevention function in order to prevent the unauthentic unlocking of a locking device of a simple structure for use in a rain shutter door or the like by unexpected operation from the outside. SOLUTION: The double lock tool is set up by imparting a double locking function to the existing locking device of the simple structure. Specifically, the double lock tool is implemented by mounting a lock tool a1 for preventing an unlocking handle a2 from acting in an acting direction at the time of unlocking on the locking device in a manner of binding the unlocking handle a2 so that the locking device cannot be released by the simple operation of the single motion of the unlocking handle a2. COPYRIGHT: (C)2009,JPO&INPIT
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