| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable an evacuation opening to be formed only by addition of a simple structure to a usual shutter device. <P>SOLUTION: A plurality of guide blocks 40 are provided at spaces in the vertical direction in both end parts of a shutter curtain 4 in width direction. When a load above a predetermined level acts on the shutter curtain 4, a guide rail 5, which receives the guide blocks 40 and guides them vertically, expands and the guide blocks 40 are therefore derailed from the guide rail 5. In the shutter curtain 4, a mark M is prepared in a height section corresponding to the height of at least one guide block 40 in a section approaching the guide rail 5 when the shutter curtain is fully closed. When an opening is fully closed, the shutter curtain 4 is locally pressed via the mark M to derail the at least one guide block 40 from the guide rail 5, further derailing the plurality of guide blocks 40 to form an evacuation opening. <P>COPYRIGHT: (C)2012,JPO&INPIT |
