| 摘要 |
A shutter including a casing, two chain transmission mechanisms bilaterally and vertically mounted inside said casing, two linkages suspended from the top rail of the casing on the inside, a set of louvers pivotably connected between the linkages, a power drive controlled to turn the chain transmission mechanisms, and two hook members fastened to the chain transmission mechanisms and moved to carry the linkages and the louvers between the active position and the inactive position, louvers being carried turned between the horizontal position and the vertical position when the linkages are moved to the active position and the chain transmission mechanisms are continuously turned to a certain extent.
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