| 摘要 |
PROBLEM TO BE SOLVED: To secure a prime prevention security against an intruder opening the shutter and intruding by drilling the opening door of the shutter operation box by a drill and breaking it, and operating the lifting switch in the operation box. SOLUTION: By closely disposing a high hard plate 6 made of a high-speed tool steel (SKH steel) or the like so as to spread on the whole face as wide as possible at the rear face of the opening door 5 made of stainless steel of the operation box B, A shock absorbing material 7 such as a thick rubber and two sheets of high-hard plates 8 such as a carbon tool steel (SK material) are closely arranged at the rear face likewise. Thereby the abutment of the drill or the shock of hammer are absorbed and the drilling of a hole on the opening door 5 by the intruder and breakage can be prevented to protect the lifting switch in the operation box B. COPYRIGHT: (C)2005,JPO&NCIPI
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