Concealed type lifting control mechanism for venetian blind
US6575223B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 29, 2002 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Jan 29, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B9/90
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A concealed type lifting control mechanism installed in a Venetian blind and adapted to control lifting of the lift cord of the Venetian blind comprises at least two take-up reel sets that provide a predetermined spring release force and are connected to the lift cord to impart a roll-up prestress to the lift cords for taking up the lift cords, a synchronizing transmission unit coupled to the at least two take-up reel sets for enabling the at least two take-up reel sets to be work synchronously, and a positioning device set provided between the take-up reel sets and moved between an engagement position and a release position to determine the provision of the roll-up prestress, for enabling the lift cords to be moved to adjust the Venetian blind to the desired elevation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.