Cordless retractable roller shade for window coverings
US10030439B2 · kind B2 · utility
5Cited by
18References
43Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 2016 |
| Grant date | Jul 24, 2018 |
| Priority date | — |
| Expiry date | May 16, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/3222
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A cordless retractable shade including an operating system for the shade that varies a biasing force of a spring to counterbalance the shade. The bottom rail of a retractable shade can be raised or lowered, and due to the operating system remains in any selected position of the covering between fully extended and fully retracted, without the use of operating cords. The system includes a method of negating and reversing the spring bias effect at a strategic position whereby the flexible vanes of the shade can be adjusted between open and closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.