| 摘要 |
The invention relates to improvements in a roll-up shutter. More particularly, the invention provides an electrically-driven shutter which can be electrically deployed or retracted, and the slats may be electrically tilted for ventilation or vertically closed for maximum security, all by use of a single electric motor. The invention achieves the above objects by providing an electrically driven roll-up shutter, comprising a plurality of upper pivoted link elements each of which supports all lower components, the linkage pivots being arranged to allow roll-up on a shutter shaft or tube, the lowest of the link elements being attached to a slat tilt mechanism, the upper pivoted link elements when in tension with only the highest of the link elements in contact with the shutter shaft or tube form a substantially straight line.
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