Swivel chair with adjustable back rest
US4943115A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1989 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Aug 29, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C1/03255
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A chair wherein the support at the upper end of the leg has a rigidly mounted carrier for the front portion of the seat and a carrier for the back rest. The carrier for the back rest is connected to the carrier for the seat by a coupling which allows angular and translatory movements of the carrier for the back rest. A detent mechanism is provided to hold the back rest in any one of several different positions of inclination with reference to the seat. One element of the detent mechanism is a toothed rack on a slide which is connected with the carrier for the back rest and is reciprocable in a slot of the carrier for the seat. Another element of the detent mechanism is a lever which has one or more teeth movable into and from mesh with the teeth of the rack by a mechanism which can pivot the lever against the opposition of a torsion spring. The spring or springs which pemanently tend to pivot the back rest forwardly prevent the torsion spring from disengaging the teeth of the lever from the teeth of the rack; to this end, the flanks of teeth on the rack are configurated in such a way that the spring or springs for the back rest maintain the flanks in pronounced frictional engagemen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.