Lift control device for a roller shade
US6739373B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Mar 10, 2003 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Mar 10, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B9/50
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A lift control device for a roller shade has a side cover, a roller, a chain retaining wheel, a chain and a follower spool. The side cover has an axle and multiple inner teeth. The roller is rotatably mounted around and is eccentric to the axle. The roller has multiple teeth partially engaging with the inner teeth on the side cover and at least one stub. The chain retaining wheel has an eccentric hole to rotatably receive the roller. The follower spool is attached to the chain retaining wheel and engages with the roller to rotate with the roller. Accordingly, a shade blind connected to the follower spool is actuated in instant when the chain is drawn. The follower spool is kept from rotating even when a large force applied to the follower spool, and the safety of using the roller shade is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.