Spring-assisted cordless roller shade without clutch system
US9816317B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 4, 2015 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Dec 4, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF03G1/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.