Chair construction
US6523898B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2000 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | May 25, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C7/462
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A chair includes a base having a control, and a seat and a back tilt bracket pivoted to the control for synchronous movement. An extension is adjustably supported on the back tilt bracket and is pivotally connected to a back support structure and a backrest frame in a four-bar linkage arrangement. The extension is adjustable to change the angular position of the back when in the rest position, and further provides a back tilt axis that is located rearward of a rear edge of the seat, which provides a unique back movement upon recline that is more rearward and less downward than most synchrotilt chairs. The back support structure includes a spine assembly pivoted to a rear end of the extension and extends upwardly. Armrests are operably supported on the spine assembly for vertical adjustment by an armrest mount, and a handle on the armrests is operably connected to a latch on the armrest mount for easy adjustment of the armrests. The arrangement of the backrest frame, the spine assembly, the back tilt bracket and the seat with side supports provides a unique synchronous movement that, among other things, pivots the armrests at an angular rate between a rate of the seat and the back d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.