| 摘要 |
PROBLEM TO BE SOLVED: To provide a crime preventive grating having high safety capable of preventing a crime of intruding from an external part by issuing an alarm by electrically detecting the break when a joining part of a vertical rail and a horizontal rail is broken in the rail-type crime preventive grating. SOLUTION: A switch 7 arranged so as to be positioned in a crossing part with the vertical rail 3 and detecting this release when joining of the vertical rail 3 and the horizontal rail 2 is released, is arranged inside the horizontal rail 2 of the grating 1. A power source and a sounder electrically connected to the switch 7 is similarly arranged inside the horizontal rail 2, and the sounder sounds the alarm when the switch 7 detects a release when the joining of the vertical rail 3 and the horizontal rail 2 is released. COPYRIGHT: (C)2007,JPO&INPIT
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