US4792187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivot mechanism for seats
Assignee: Individual
•
Filing: 1987-07-16
•
Granted: 1988-12-20
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Expires: 2007-07-16
Abstract
Abstract The pivot mechanism is intended for height-adjustable seats, especially office chairs or office armchairs, with a seat (6) and a back 7) arranged at an underframe (8) to be pivotable in synchronism and being under the effect of a pretensionable pullback spring against the tilting motion oriented rearwardly, as well as with a device for locking the back (7) in positions of varying tilt. The pivot mechanism is characterized in that the seat (6) exhibits spring elements (11) effective in the pivoting plane of the back (7), which spring elements are attached to the underframe (8) and to the back (7) and act on the back (7) as pullback springs tensionable by the user's weight.
Inventors
- 👤 Simon Desanta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:34
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/032; A47C1/03255; A47C1/03261; A47C1/03272; A47C1/03283
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
In pivot mechanism for height-adjustable seats having a seat and a back attached to an underframe, the back being pivotally mounted to the underframe for forward and rearward swinging movement about a horizontal axis, and tension spring means yieldably resisting said rearward movement; the improvement in which said spring means extend and act between a forward end of the underframe and said back and are secured to said back above said horizontal axis, and a seat resting on and supported by said spring means, said spring means and seat being swingable downwardly about said forward end of the underframe upon rearward swinging movement of said back about said axis.
Claim 2
Dependent Claim
109 words
In pivot mechanism for height-adjustable seats having a seat and a back attached to an underframe, the back being pivotally mounted to the underframe for forward and rearward swinging movement about a horizontal axis, and tension spring means yieldably resisting said rearward movement; the improvement in which said spring means extend and act between a forward end of the underframe and said back and are secured to said back above said horizontal axis, and a seat resting on and supported by said spring means, said spring means and seat being swingable downwardly about said forward end of the underframe upon rearward swinging movement of said back about said axis.
Claim 3
Dependent Claim
34 words
Apparatus as claimed in claim 1, said spring means extending about a horizontal guide member at the forward end of the underframe and being connected to a tensioning element for pretensioning said spring means.
Claim 4
Dependent Claim
21 words
Apparatus as claimed in claim 2, said spring means and said seat swinging vertically about said guide member as a pivot.
References Cited (Backward Citations)
FR958120A
Cited
US2296603A
Cited
US2619153A
Cited
DE2040429A1
Cited
CA869337A
Cited
US4479679A
Cited
DE3322450A1
Cited
US4653806A
Cited
DE8607194U1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |