| 摘要 |
PROBLEM TO BE SOLVED: To provide a shutter easily openable by lightly operating it manually. SOLUTION: This shutter comprises an under lock mechanism locking a shutter curtain in the state of being lowered to a floor surface, an endless track installed on the side of the shutter curtain and having vertically reciprocating right and left tracks, an upper slider connected to one of the tracks and moving in the vertical direction, a lower slider positioned on the lower side of the upper slider, connected to the other of the tracks, and moving in the vertical direction, an energizing means energizing the lower slider upward, a plate allowed to come into contact with the upper slider and installed at the lower part of the shutter curtain so as to be allowed to come into contact with the lower slider, and a slider lock mechanism locking the upper slider in the state of being raised. COPYRIGHT: (C)2006,JPO&NCIPI
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