US4640548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair with an adjustable backrest
Assignee: KUSCH & Co
•
Filing: 1983-10-17
•
Granted: 1987-02-03
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Expires: 2003-10-17
Abstract
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).
Inventors
- 👤 Simon Desanta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:10
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/032; A47C1/03261; A47C1/03288; A47C1/03255; A47C1/03266; A47C1/03283
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
157 words
A chair, especially an office chair, having a vertical column with a seat mounted on said column and a backrest connected to said column by a curved supporting bar, means defining three hinge points, each having a horizontal transverse axis, for respectively connecting the seat and the column, the column and the supporting bar and the supporting bar and the seat in a hinged triangular arrangement, wherein, when said backrest is reclined, said hinge point connecting the seat and the supporting bar is simultaneously vertically moved horizontally shifted between the seat and the supporting bar, wherein said hinge points connecting the seat and the column on the one hand and the seat and the supporting bar on the other hand, respectively, are formed by rubber pads, whereby seat movement is divided into a shifting movement between the seat and the column on the one hand and between the seat and the supporting bar on the other hand.
Claim 2
Dependent Claim
157 words
A chair, especially an office chair, having a vertical column with a seat mounted on said column and a backrest connected to said column by a curved supporting bar, means defining three hinge points, each having a horizontal transverse axis, for respectively connecting the seat and the column, the column and the supporting bar and the supporting bar and the seat in a hinged triangular arrangement, wherein, when said backrest is reclined, said hinge point connecting the seat and the supporting bar is simultaneously vertically moved horizontally shifted between the seat and the supporting bar, wherein said hinge points connecting the seat and the column on the one hand and the seat and the supporting bar on the other hand, respectively, are formed by rubber pads, whereby seat movement is divided into a shifting movement between the seat and the column on the one hand and between the seat and the supporting bar on the other hand.
Claim 3
Dependent Claim
84 words
A chair according to claim 1, wherein the seat is connected at the front area by at least one rubber pad with a projecting arm of the column which points forward, and at the rear area, the seat is connected by at least one other rubber pad with a lower section of the curved supporting bar, where it is essentially horizontal, and said curved supporting bar being connected to said column along a horizontal transverse axis so that said curved supporting bar can swivel.
Claim 4
Dependent Claim
40 words
A chair according to claim 2, wherein the swiveling movement of the curved supporting bar about the hinge point which connects it with the column can be stopped in various relative angle positions with the help of an adjusting device.
Claim 5
Dependent Claim
33 words
A chair according to claim 2 further including control means for controlling the swiveling motion impartable to said curved supporting bar so that said swiveling bar can be stopped in various angular positions.
Claim 6
Dependent Claim
20 words
A chair according to claim 3, wherein the adjusting device includes a plate with holes and a pin locking mechanism.
Claim 7
Dependent Claim
14 words
A chair according to claim 3, wherein the adjusting device includes a pneumatic spring.
Claim 8
Dependent Claim
30 words
A chair according to claim 1 further including a rubber buffer between the curved supporting bar and a part of the column for placing the backrest and seat under tension.
Claim 9
Dependent Claim
46 words
A chair according to claim 7, wherein said rubber buffer is positioned between an extension of the curved supporting bar which projects forward beyond the hinge point between the column and said supporting bar and the lower side of a plate-shaped part of the projecting arm.
Claim 10
Dependent Claim
17 words
A chair according to claim 7, further including means for varying the effect of said rubber buffer.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |