US4986601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tilting mechanism for supporting seat portion and backrest of chair in integral fashion
Assignee: INOUE NOBORU 5-6 MINAMIAZABU 3-CHOME MINATO-KU TOKYO JAPAN
•
Filing: 1989-11-16
•
Granted: 1991-01-22
•
Expires: 2009-11-16
Abstract
Abstract A tilting mechamism for supporting a seat portion and a backrest of chair in integral fashion. This mechanism comprising an upright support; a pedestal block mounted on an upper end of the upright support for swivel movement; an arm member pivotally engaged at the rear side thereof by a first horizontal shaft mounted on the pedestal block toward the front of the upright support; a seat plate pivotally engaged at a front portion thereof with the end of this arm member by a second horizontal shaft; an elastic body such as a spring lying between this plate and the block; a backrest supporting member on which a backrest can be mounted, the supporting member being elongated and carried in part on the lower face of the seat plate and pivotally engaged with a long hole formed at the rear end of the seat plate by a third horizontal shaft; the forward part of this supporting member mounted on the pedestal block by the first shaft pivotally engaging the arm member with the block; and a gas spring connecting between a fourth shaft mounted on the front end of this supporting member and the second shaft positioned at the front end of the arm member.
Inventors
- 👤 Noboru Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:26
CPC Classifications
A; A47; A47C; A47C1/00; A47C1/02; A47C1/031; A47C1/032; A47C1/03255; A47C1/03261; A47C1/03283; A47C1/03272
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
191 words
A tilting mechanism for supporting a seat portion that extends forwardly and a backrest of a chair in integral fashion, comprising: an upright support; a pedestal block for swivel movement mounted on the upper end of said upright support; an arm member having a rear end pivotally engaged with said pedestal block by a first horizontal shaft carried forwardly of said upright support; a seat plate having a front portion pivotally engaged with a front end of said arm member by a second horizontal shaft; an elastic body lying between said seat plate and said pedestal block; a backrest supporting member on which a backrest can be mounted, carried in part below said seat plate, said backrest supporting member being pivotally engaged at a rearwardly extending portion with a rear portion of said seat plate by a third horizontal shaft carried in an oblong hole in said seat plate and pivotably engaged at a forwardly extending portion with said pedestal block by said first horizontal shaft; and a gas spring 7 connecting between a fourth shaft mounted on a front end of said backrest supporting member and said second horizontal shaft.
Claim 2
Dependent Claim
191 words
A tilting mechanism for supporting a seat portion that extends forwardly and a backrest of a chair in integral fashion, comprising: an upright support; a pedestal block for swivel movement mounted on the upper end of said upright support; an arm member having a rear end pivotally engaged with said pedestal block by a first horizontal shaft carried forwardly of said upright support; a seat plate having a front portion pivotally engaged with a front end of said arm member by a second horizontal shaft; an elastic body lying between said seat plate and said pedestal block; a backrest supporting member on which a backrest can be mounted, carried in part below said seat plate, said backrest supporting member being pivotally engaged at a rearwardly extending portion with a rear portion of said seat plate by a third horizontal shaft carried in an oblong hole in said seat plate and pivotably engaged at a forwardly extending portion with said pedestal block by said first horizontal shaft; and a gas spring 7 connecting between a fourth shaft mounted on a front end of said backrest supporting member and said second horizontal shaft.
Claim 3
Dependent Claim
154 words
A tilting mechanism for supporting a forwardly extending seat and upwardly extending backrest of a chair having an upright support, comprising: a pedestal block rotatably carried by the upper portion of said upright support; an arm member having a rear end pivotably engaged with said pedestal block by a first shaft carried forwardly of said upright support; a seat plate for carrying the seat, having a front portion pivotally engaged with a front end of said arm member by a second shaft; a backrest supporting member for carrying the backrest, having a rearwardly extending portion pivotably engaged with a rear portion of said seat plate by a third shaft carried in an oblong hole in said seat plate and a forwardly extending portion pivotably engaged with said first shaft; and spring means pivotably engaged with said second shaft and with said backrest supporting member by a fourth shaft positioned forwardly of said first shaft.
Claim 4
Dependent Claim
154 words
A tilting mechanism for supporting a forwardly extending seat and upwardly extending backrest of a chair having an upright support, comprising: a pedestal block rotatably carried by the upper portion of said upright support; an arm member having a rear end pivotably engaged with said pedestal block by a first shaft carried forwardly of said upright support; a seat plate for carrying the seat, having a front portion pivotally engaged with a front end of said arm member by a second shaft; a backrest supporting member for carrying the backrest, having a rearwardly extending portion pivotably engaged with a rear portion of said seat plate by a third shaft carried in an oblong hole in said seat plate and a forwardly extending portion pivotably engaged with said first shaft; and spring means pivotably engaged with said second shaft and with said backrest supporting member by a fourth shaft positioned forwardly of said first shaft.
Claim 5
Dependent Claim
25 words
The mechanism as defined in claim 2 wherein said backrest supporting member bifurates rearwardly of said upright support and has two members extending forwardly thereof.
Claim 6
Dependent Claim
18 words
The mechanism as defined in claim 2 wherein said oblong hole has a major axis extending generally horizontally.
Claim 7
Dependent Claim
29 words
The mechanism as defined in claim 2 wherein said arm member is U-shaped, with said pedestal block positioned therein and with two arms extending forwardly of said pedestal block.
References Cited (Backward Citations)
US2471024A
Cited
US4502729A
Cited
US4709962A
Cited
DE3605809A1
Cited
EP0240389A1
Cited
US4848837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |