Spring-assisted cordless roller shade without clutch system
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United States of America Patent
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Nov 14, 2017
Issued Date -
N/A
app pub date -
Dec 4, 2015
filing date -
Apr 17, 2014
priority date (Note) -
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Abstract
A spring-assisted cordless roller shade without clutch system includes a tubular body defining an internal space. A shade is wound on the tubular body. The internal space has a first section and a second section. In each of the first and second sections are mounted a connector, a central shaft assembled with the connector, a fixing member connected with the central shaft and a subsidiary shaft disposed on the fixing member. An elastic member is disposed between the connector and the central shaft to provide a frictional force. A rotational member and a torsion spring are mounted on the subsidiary shaft of the first section and rotatable along with the tubular body. A constant force belt spring module is assembled with the subsidiary shaft of the second section. When the operational force applied to the shade disappears, the shade is immediately located.
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