Chair with seat biasing means
US4865384A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1988 |
| Grant date | Sep 12, 1989 |
| Priority date | — |
| Expiry date | Dec 6, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C1/03277
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A chair, in particular an office chair, comprising a vertical base starting out from a bottom part, a seat plate which is connected pivotally about a first horizontal transverse axis to a forwardly directed support arm of the base, and a bar receiving a back rest, which bar is connected swingably to the base along a second horizontal transverse axis and is connected swingably to the rear area of the seat plate through a third horizontal transverse axis which, at the same time, permits relative movement between the bar and seat plate perpendicularly with respect to the third transverse axis. A torsion spring has at least one spring arm which extends at an angle from the torsion axis. The torsion spring is rotationally supported on the support arm with its torsion axis parallel with respect to the first horizontal transverse axis. The spring arm extends below the rear area of the seat plate and is there supported in a support bearing on the underside of the seat plate and a slide bearing on the bar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.