| 摘要 |
A cordless window blind includes a headrail; a first bottom rail suspended from the headrail by a first cord and a second cord; a window covering disposed between the headrail and the first bottom rail and movable between a raised configuration and a lowered configuration; a drive actuator including a spring motor including a drive wheel, a driven wheel, and an elongated spring belt having a first end secured to the drive wheel and a second end secured to the driven wheel, wherein the spring belt includes a length with a tapered width. Further included are first and second spools having a conical circumferential surface around which the first and second cords are respectively wound when the window covering is in the raised configuration. Also included is a hinged valence arm.
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