Apparatus for raising and lowering covering member of window covering
US8919416B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 2013 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Jul 27, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/3222
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for raising and lowering a covering member of a window covering includes a sliding base, a first biasing device, a connecting device, and a second biasing device. The sliding base is moved between a first position and a second position in a headrail. The first biasing device has two first biasing members to urge the sliding base toward the first position. The connecting device is moved between a third position and a fourth position in the headrail. The second biasing device has a second biasing member to urge the connecting device toward the third position. The second biasing member of the second biasing device is added at a middle of raising the covering member to help the covering member totally received close to or in the headrail.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.