Methods for operating window covers
US8887788B2 · kind B2 · utility
15Cited by
117References
28Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Jun 14, 2013 |
| Grant date | Nov 18, 2014 |
| Priority date | — |
| Expiry date | Aug 5, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1836
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A window cover system includes an extendible window cover with a pair of lift cords. A lift cord pulley shaft is coupled to a pair of spaced apart lift cord pulleys. A spring drive unit has a beveled gear system with a first gear that is spring biased to resist rotation of first gear in one direction of rotation, and a second gear meshed with the first gear. The lift cord pulley shaft extends through the second gear and is configured to rotate therewith.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.