Patent US5370445A successfully refreshed from Google Patents.
US5370445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chair control
Assignee: Knoll Inc
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Filing: 1993-06-10
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Granted: 1994-12-06
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Expires: 2013-06-10
Abstract
Abstract Disclosed is knee tilt chair control mechanism for a pedestal base chair having a chair control housing mounted on the pedestal chair base and pivotally supporting a chair seat support member having a cam surface formed along a portion of the bottom surface thereof. A torsion spring is secured to the chair control housing and is adapted to resist the pivotal movement of the chair seat support member. The torsion spring has a lever arm adapted to move along the cam surface during the pivotal movement of the chair seat support member and thereby make a more effective use of the torsion spring and a chair more comfortable to the user.
Inventors
- 👤 Arkady Golynsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:34
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/02; A47C3/025; A47C3/026; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/441; A47C7/443; A47C7/444; H; H02; H02K; H02K9/00; H02K9/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A chair, comprising: a base including a chair seat control housing mounted thereon, said housing having a spring support around which is disposed a torsion spring, said torsion spring having a first leg and a second leg fixedly attached to said housing; and a chair seat including an integrally connected bottom plate having two side plates connected thereto wherein said two side plates are pivotally connected to said chair seat control housing, said bottom plate further having a downwardly extending cam surface; wherein said first leg of said torsion spring slidably engages said cam surface during pivotal movement of said chair seat.
Claim 2
Dependent Claim
102 words
A chair, comprising: a base including a chair seat control housing mounted thereon, said housing having a spring support around which is disposed a torsion spring, said torsion spring having a first leg and a second leg fixedly attached to said housing; and a chair seat including an integrally connected bottom plate having two side plates connected thereto wherein said two side plates are pivotally connected to said chair seat control housing, said bottom plate further having a downwardly extending cam surface; wherein said first leg of said torsion spring slidably engages said cam surface during pivotal movement of said chair seat.
Claim 3
Dependent Claim
16 words
The chair as recited in claim 1, wherein said cam surface is substantially convex in shape.
Claim 4
Dependent Claim
22 words
The chair as recited in claim 1, wherein said cam surface is a plane parallel to but spaced from said bottom plate.
Claim 5
Dependent Claim
25 words
The chair as recited in claim 1, wherein said cam surface comprises at least one substantially convex portion and at least one substantially concave portion.
Claim 6
Dependent Claim
129 words
A chair, comprising: a base including a chair seat control housing mounted thereon, said housing having a spring support around which is disposed a torsion spring, said torsion spring having a first leg and a second leg, said housing further having a torsion adjusting means to which said second leg is fixedly attached for changing the fixed position of said second leg relative to said first leg; and a chair seat including an integrally connected bottom plate having two side plates connected thereto wherein said two side plates are pivotally connected to said chair seat control housing, said bottom plate further having a downwardly extending, substantially convex cam surface; wherein said first leg of said torsion spring slidably engages said cam surface during pivotal movement of said chair seat.
Claim 7
Dependent Claim
129 words
A chair, comprising: a base including a chair seat control housing mounted thereon, said housing having a spring support around which is disposed a torsion spring, said torsion spring having a first leg and a second leg, said housing further having a torsion adjusting means to which said second leg is fixedly attached for changing the fixed position of said second leg relative to said first leg; and a chair seat including an integrally connected bottom plate having two side plates connected thereto wherein said two side plates are pivotally connected to said chair seat control housing, said bottom plate further having a downwardly extending, substantially convex cam surface; wherein said first leg of said torsion spring slidably engages said cam surface during pivotal movement of said chair seat.
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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) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |