Transmission device for cordless window shades
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United States of America Patent
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Apr 14, 2020
Grant Date -
Sep 21, 2017
app pub date -
Mar 19, 2017
filing date -
Mar 21, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A window shade includes a top box, a mediate bar, a bottom bar and a shade connected between the mediate bar and the bottom bar. A first scrolling unit and a second scrolling unit are located in the top box, and each are cooperated with a movable unit, a resilient member and a fixed member. The resilient member is connected between the movable unit and the fixed member. Each of the first scrolling unit and the second scrolling unit has a first roller and a second roller, and each of the movable unit has a third roller and a fourth roller. The first cords of the first scrolling unit are connected to the mediate bar. The second cords of the second scrolling unit extend through the mediate bar and are connected to the bottom bar. The first and second cords meet the requirements of a longer shade.
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