Patent US5401077A successfully refreshed from Google Patents.
US5401077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ergonomically improved chair or armchair
Assignee: Individual
•
Filing: 1992-02-20
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Granted: 1995-03-28
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Expires: 2012-02-20
Abstract
Abstract An ergonomical chair is provided, of the type which is adjustable in height, whose seat has a front portion with a slope automatically changeable as a function of the height adjustment. The seat rear portion remains substantially horizontal, irrespective of the height adjustment and the consequent tilting of the front portion, thus avoiding the downward sliding of the body which can stay in its erect or slightly backward bent position, while a correct leaning of the seat front portion of the lower region of the thighs is ensured without exerting any tiring action by the user. Another embodiment of the invention has armrests and backrest adjustable integrally with each other.
Inventors
- 👤 Isao Hosoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:02
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/02; A47C7/024; A47C1/00; A47C1/02; A47C1/022; A47C1/03; A47C1/0308; A47C1/031; A47C1/032; A47C1/03255; A47C3/00; A47C3/02; A47C3/025; A47C3/026
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
94 words
A chair adjustable as to the height, comprising a one-piece portion vertically movable with respect to a fixed base, said one-piece portion comprising a backrest portion and integrally therewith a seat rear portion of a seat, and a seat front portion of the seat, said seat front portion hinged to said seat rear portion, whereby said seat front portion is downwardly tiltable with respect to said seat rear portion, and a means for automatically adjusting the tilting angle of said seat front portion as a function of the height of said one-piece movable portion.
Claim 2
Dependent Claim
94 words
A chair adjustable as to the height, comprising a one-piece portion vertically movable with respect to a fixed base, said one-piece portion comprising a backrest portion and integrally therewith a seat rear portion of a seat, and a seat front portion of the seat, said seat front portion hinged to said seat rear portion, whereby said seat front portion is downwardly tiltable with respect to said seat rear portion, and a means for automatically adjusting the tilting angle of said seat front portion as a function of the height of said one-piece movable portion.
Claim 3
Dependent Claim
24 words
The chair according to claim 1, wherein the automatic adjusting means comprises a means for connecting the seat front portion to the fixed base.
Claim 4
Dependent Claim
14 words
The chair according to claim 2, wherein the connecting means is a linked arm.
Claim 5
Dependent Claim
15 words
The chair according to claim 3, wherein the linked arm is adjustable by the user.
Claim 6
Dependent Claim
86 words
The chair according to claim 4, wherein the linked arm is hinged at a first end to said fixed base and at a second end to said seat front portion, the linked arm comprising an extension arm adjustably hinged at one end thereof to the second end of the linked arm and at a second end of the extension arm to the seat front portion, whereby the working length of the linked arm can be variably fixed by adjusting a hinge angle of the extension arm.
Claim 7
Dependent Claim
65 words
The chair according to claim 4, wherein the linked arm is hinged at a first end to the fixed base, and is connected to the seat front portion by way of a slot located towards a second end of the linked arm, whereby the working length of the linked arm is adjustable and is dependent on the position of a connecting point within the slot.
Claim 8
Dependent Claim
59 words
The chair according to claim 2, wherein the connecting means comprises an adjustable cylinder and piston arrangement operable by a pressure means, wherein the full working length of the connecting means is determined by the total of the length of the cylinder and the length of a portion of the piston projecting therefrom at a given fixable stroke position.
Claim 9
Dependent Claim
12 words
The chair according to claim 1, wherein the one-piece portion is tiltable.
Claim 10
Dependent Claim
37 words
The chair according to claim 1, wherein the one-piece portion further comprises a pair of armrests fixed thereto, such that a vertical adjustment of the one-piece portion brings about a corresponding adjustment to the pair of armrests.
Claim 11
Dependent Claim
17 words
The chair according to claim 9, wherein the one-piece portion and the pair of armrests are integral.
Claim 12
Dependent Claim
26 words
The chair according to claim 9, wherein the armrests are connected to the one-piece portion through armrest connecting means allowing for the removal of the armrests.
Claim 13
Dependent Claim
32 words
The chair according to claim 11, wherein said armrest connecting means comprises a pair of sleeves fixed to the one-piece portion, which sleeves removably receive a pair of posts supporting the armrests.
References Cited (Backward Citations)
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Cited
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US4695093A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |