US4411469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair, particularly a data display chair
Assignee: Drabert Soehne GmbH and Co
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Filing: 1980-07-17
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Granted: 1983-10-25
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Expires: 2000-07-17
Abstract
Abstract A chair having a base, a seat, a backrest and a spring between the seat and the backrest. A first pair of links is pivotably connected to the seat and the backrest respectively and a second pair of links is pivotably connected to the seat and the base respectively, one pair forming an angle lever connected to the seat. One end of the spring is adjustably supported either by a nut and spindle and a bar between the angle lever and the spring or by a slide in the form of a nut on a threaded spindle and a guide slidably receiving the slide and arranged in the angle lever.
Inventors
- 👤 Fritz Drabert
- 👤 Oskar Posch
- 👤 Hans-Joachim Edel
- 👤 Bernhard Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:59
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/032; A47C1/03255; A47C1/03261; A47C1/03266; A47C31/00; A47C31/12; A47C31/126
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A chair comprising: base means, seat means pivotally supported at said base means; back rest means pivotable with respect to said seat means about a substantially horizontal axis, spring means kinematically coupling said seat means and said back rest means, a first pair of links having first ends pivotally connected to said seat means and second ends pivotally connected to said back rest means, a second pair of links having first ends pivotally connected to said seat means and second ends pivotally connected to said base means, one of said pairs of links forming an angle lever pivotally connected at said seat means, said angle lever provided with means for adjustably supporting one end of said spring means, said means for adjustably supporting said spring means comprises a nut journaled on a threaded spindle, said nut supporting a pivot supporting one end of said spring means, and a bar having one end pivotally supported at said pivot and the other end pivotally supported as said angle lever.
Claim 2
Dependent Claim
167 words
A chair comprising: base means, seat means pivotally supported at said base means; back rest means pivotable with respect to said seat means about a substantially horizontal axis, spring means kinematically coupling said seat means and said back rest means, a first pair of links having first ends pivotally connected to said seat means and second ends pivotally connected to said back rest means, a second pair of links having first ends pivotally connected to said seat means and second ends pivotally connected to said base means, one of said pairs of links forming an angle lever pivotally connected at said seat means, said angle lever provided with means for adjustably supporting one end of said spring means, said means for adjustably supporting said spring means comprises a nut journaled on a threaded spindle, said nut supporting a pivot supporting one end of said spring means, and a bar having one end pivotally supported at said pivot and the other end pivotally supported as said angle lever.
Claim 3
Dependent Claim
152 words
A chair comprising: base means, seat means pivotally supported at said base means; back rest means pivotable with respect to said seat means about a substantially horizontal axis, spring means kinematically coupling said seat means and said back rest means, a first pair of links having first ends pivotally connected to said seat means and second ends pivotally connected to said back rest means, a second pair of links having first ends pivotally connected to said seat means and second ends pivotally connected to said base means, one of said pairs of links forming an angle lever pivotally connected at said seat means, said angle lever provided with means for adjustably supporting one end of said spring means, said supporting means is a slide in the form of a nut journaled on a threaded spindle, and a guide slidably receiving said slide and arranged in said one link of said angle lever.
Claim 4
Dependent Claim
152 words
A chair comprising: base means, seat means pivotally supported at said base means; back rest means pivotable with respect to said seat means about a substantially horizontal axis, spring means kinematically coupling said seat means and said back rest means, a first pair of links having first ends pivotally connected to said seat means and second ends pivotally connected to said back rest means, a second pair of links having first ends pivotally connected to said seat means and second ends pivotally connected to said base means, one of said pairs of links forming an angle lever pivotally connected at said seat means, said angle lever provided with means for adjustably supporting one end of said spring means, said supporting means is a slide in the form of a nut journaled on a threaded spindle, and a guide slidably receiving said slide and arranged in said one link of said angle lever.
Claim 5
Dependent Claim
26 words
A chair according to claim 2 wherein said one link of said angle lever forms a further angle lever having a lever arm receiving said guide.
References Cited (Backward Citations)
US343654A
Cited
US786326A
Cited
US2321385A
Cited
US2859801A
Cited
US3095415A
Cited
US3128122A
Cited
US3337267A
Cited
US3989297A
Cited
US4143910A
Cited
DE2757652A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |