| 摘要 |
A safety window blind device includes a bottomrail movable relative to a headrail to raise or lower a window shade therebetween, and a pair of lifting cords each having a vertical cord segment which runs between the headrail and the bottomrail and which is coupled with the bottom rail so as to be displaced therewith between states of long-length and short-length. A reel unit is coupled with a biasing unit to generate an incrementally increased biasing force for counteracting the weight of the bottomrail . With such structure, a sudden and inadvertent falling of the bottomrail can be prevented once the lifting cords are released.
|
