Angle adjustment mechanism for lumbar support of chair backrest
US7334841B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Nov 28, 2005 |
| Grant date | Feb 26, 2008 |
| Priority date | — |
| Expiry date | Apr 7, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C7/462
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A backrest of a chair has a recess for receiving an angle adjustable lumbar support. The lumbar support has a lower projection including a pair of cylindrical protrusions at both sides with resilient and metal gaskets put thereon, an outer gear formed around one of the pair of protrusions, and a through hole through the protrusions. A shaft assembly has inner teeth inserted into the through hole and secured by a washer and a elastic element. The lumbar support is secured to a plate of the chair, and the shaft assembly is movable on a sliding member by operating a lever of a manipulation assembly. Thus, the lumbar support is adjustable by manipulating the lever so as to cause the inner teeth to be disengaged from the gear. The lumber support is positioned by releasing the lever so as to cause the shaft assembly to force the gear and the inner teeth to be engaged together due to the expansion of the elastic element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.