US4626029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work chair
Assignee: Protoned BV
•
Filing: 1986-01-03
•
Granted: 1986-12-02
•
Expires: 2006-01-03
Abstract
Abstract The work chair is provided with a backrest support (13) which is connected movably to the seat shell (4) or respectively to a base plate (10) stiffening the latter, for the purpose of individual adjustment of inclination, and is flexible in terms of bending along its vertical extension and the contour curve of which, under load, essentially approximates to the curve of the human spinal column. The inclination of the backrest can be fixed by means of a locking arrangement (14) which consists essentially of a pawl (16) which is spring-loaded (20) and of an engagement toothing (17) provided at the lower end of the backrest support (13).
Inventors
- 👤 Egon Brauning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:06
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/022; A47C1/024; A47C1/026; Y; Y10; Y10S; Y10S297/00; Y10S297/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
148 words
A chair with an adjustable backrest support comprising a seat shell rotatably mounted on a chair column, said adjustable backrest support is connected to said seat shell by a fork-shaped bearing, a locking arrangement including an engagement claw for securing a portion of the backrest, the chair further comprising said seat shell having a base plate assembly containing said fork-shaped bearing in the form of symmetric girders projected from a rear part of the chair, said backrest support having an upper part and a lower part, said lower part having a shell shape formed by two side walls and an end wall an external surface of said endwall having a plurality of transverse recesses therein for engagement with said engagement claw of the locking arrangement providing releasable engagement coupling between the base plate and the end wall of said backrest support for adjusting the tilt of the backrest.
Claim 2
Dependent Claim
148 words
A chair with an adjustable backrest support comprising a seat shell rotatably mounted on a chair column, said adjustable backrest support is connected to said seat shell by a fork-shaped bearing, a locking arrangement including an engagement claw for securing a portion of the backrest, the chair further comprising said seat shell having a base plate assembly containing said fork-shaped bearing in the form of symmetric girders projected from a rear part of the chair, said backrest support having an upper part and a lower part, said lower part having a shell shape formed by two side walls and an end wall an external surface of said endwall having a plurality of transverse recesses therein for engagement with said engagement claw of the locking arrangement providing releasable engagement coupling between the base plate and the end wall of said backrest support for adjusting the tilt of the backrest.
Claim 3
Dependent Claim
19 words
A chair according to claim 1 wherein said adjusable backrest support swings forwardly and backwardly within said fork-shaped bearing.
Claim 4
Dependent Claim
18 words
A chair according to claim 1 wherein said end wall is positioned substantially perpendicularly to said side walls.
Claim 5
Dependent Claim
25 words
A chair according to claim 1 wherein said side walls and end wall define a structure stiffened in the substantially upright and substantially horizontal directions.
References Cited (Backward Citations)
US412617A
Cited
US2310476A
Cited
DE2338142A1
Cited
US4270797A
Cited
EP0032839A2
Cited
US4408800A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |