Resistance device
US11473370B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 25, 2020 |
| Grant date | Oct 18, 2022 |
| Priority date | — |
| Expiry date | Feb 12, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/3222
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A resistance device includes a base having a channel, a friction member provided in the base, and a moving member adjacent to the friction member, wherein the moving member is located in the channel and is movable therein. A window covering applied with the resistance device includes a covering material and a lifting cord concurrently movable with the covering material. When the covering material is being retracted or extended, the lifting cord moves in two opposite directions, respectively. The lifting cord passes through the resistance device. When the lifting cord moves in either direction, it drives the moving member to move in the same direction as itself. The friction member provides different resistances to the lifting cord which moves in different directions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.