| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To raise the operation permitting wind pressure of a sheet shutter device by increasing the weight of a bottom weight. <P>SOLUTION: The shutter device comprises a sheet-like shutter curtain 1, a pair of guide rails 2 guiding the two ends of the shutter curtain 1, weights 62, 63 vertically spaced apart from each other in a plurality of stages on the left/right ends at the bottom end section of the shutter curtain 1 and an obstacle detecting means for stopping the downward movement of the shutter curtain 1 before the load of the weight 62 right above the weight 63 acts on an obstacle when the bottom end of the shutter curtain 1 collides against the obstacle. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
