Tension control mechanism for chair
US7281764B2 · kind B2 · utility
133Cited by
37References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 31, 2003 |
| Grant date | Oct 16, 2007 |
| Priority date | — |
| Expiry date | Aug 6, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C1/03274
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
The chair includes seat and back assemblies interconnected in a four-bar linkage. The chair further includes a tension mechanism comprising a coil spring projecting forwardly from a base and an adjustment linkage which is connected to said coil spring and to a front link of said four-bar linkage. A back linkage end of said adjustment linkage being axially movable along an axis of said coil spring and a front linkage end being vertically movable along said front link to adjust displacement of said adjustment linkage during rearward pivoting of said front link.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.