Patent US4707029A successfully refreshed from Google Patents.
US4707029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for supporting parts of furniture
Assignee: Röder Sitzmöbelwerke GmbH
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Filing: 1986-07-25
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Granted: 1987-11-17
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Expires: 2006-07-25
Abstract
Abstract An apparatus for supporting a part of a piece of furniture on another part of the piece of furniture, especially of a backrest support of a desk chair on its lower support, has a spring. The preset spring bias can be adjusted by an adjustment member. A bent link tube has one end which is arranged at the spring and another end supporting the adjustment member for adjusting the spring from a point the spring longitudinal axis. A force transmission member is moved by the adjustment member and is guided in the link tube to work effectively on the spring. A mechanism is also mounted in the link tube for controlling the force exerted from adjustment member on the transmission member.
Inventors
- 👤 Heinrich Korn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:50
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/443; A47C3/00; A47C3/02; A47C3/025; A47C3/026; A47C7/441
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
An apparatus for supporting parts of a piece of furniture, especially a backrest support of a desk chair on a lower support thereof, comprising: a spring with first and second ends, said first end of said spring abutting a pivotally mounted plate; an adjustment member coupled to said spring for varying biasing of said spring; a bent link tube having a first end located at said second end of said spring and an opposite second end supporting said adjustment member; a cylindrical force transmission member connected to and controlled by said adjustment member, and guided for sliding movement in said link tube to change characteristics of said spring; and coupling means, mounted in said link tube, for connecting and for controlling forces exerted by said adjustment member on said force transmission member.
Claim 2
Independent Claim
132 words
An apparatus for supporting parts of a piece of furniture, especially a backrest support of a desk chair on a lower support thereof, comprising: a spring with first and second ends, said first end of said spring abutting a pivotally mounted plate; an adjustment member coupled to said spring for varying biasing of said spring; a bent link tube having a first end located at said second end of said spring and an opposite second end supporting said adjustment member; a cylindrical force transmission member connected to and controlled by said adjustment member, and guided for sliding movement in said link tube to change characteristics of said spring; and coupling means, mounted in said link tube, for connecting and for controlling forces exerted by said adjustment member on said force transmission member.
Claim 3
Dependent Claim
40 words
An apparatus according to claim 1 wherein said adjustment member is moveable along a longitudinal axis of a guide and projects into said link tube, said guide extending parallel a longitudinal axis of said second end of said link tube.
Claim 4
Dependent Claim
28 words
An apparatus according to claim 2 wherein said coupling means comprises a plurality of pressure elements having outer dimensions corresponding to an inner diameter of said link tube.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 1 wherein said coupling means comprises a plurality of pressure elements having outer dimensions corresponding to an inner diameter of said link tube.
Claim 6
Dependent Claim
35 words
An apparatus according to claim 2 wherein said adjustment member and said force transmission member comprise piston shaped portions projecting into said link tube; and said coupling means comprises an easily deformable, essentially incompressible mass.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 1 wherein said ends of said bent tube have longitudinal axes oriented at an angle.
Claim 8
Dependent Claim
24 words
An apparatus according to claim 1 wherein said link tube comprises a bend intermediate said ends thereof and a pivot joint adjacent said bend.
Claim 9
Dependent Claim
30 words
An apparatus according to claim 1 wherein said spring is arranged on a rod projecting into said force transmission member and through said plate to engage pivotally a spring bearing.
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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) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |