Chair with an adjustable backrest
US4640548A · kind A · utility
93Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1983 |
| Grant date | Feb 3, 1987 |
| Priority date | — |
| Expiry date | Oct 17, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C1/03283
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An adjustable chair, especially an office chair, includes a column (32), a seat (34), a backrest (36), supported by a curved supporting bar (40). Three horizontal transverse axes (44, 46, 48) connect the seat and the column, the column and the curved supporting bar and the curved supporting bar and the seat in one hinged triangular arrangement where at least one transverse axis permits not only a swiveling motion but also a relative shift of the connected parts to permit an adjustment of the seat and backrest. At least one of the transverse axes of this type consists of at least one rubber pad (46, 48).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.