Twist release safety stop ball for window covering cord
US7331371B1 · kind B1 · utility
4Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2006 |
| Grant date | Feb 19, 2008 |
| Priority date | — |
| Expiry date | Jul 22, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T24/3982
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A safety stop ball includes a post and a nut which travels along a spiral path relative to the post. The nut and the post are biased toward each other to retain the ends of lift cords. As the nut is displaced relative to the post, the lift cords are released.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.