US4183494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Swiveled leaf-spring undercarriage for rocking chair
Assignee: TRENDLER METAL PRODUCTS Inc
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Filing: 1978-11-13
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Granted: 1980-01-15
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Expires: 1998-11-13
Abstract
Abstract A leaf-spring supported, free-floating rocker undercarriage for a swivel chair wherein the spring flexural axis corresponds to and the swivel axis intersects with the rocking axis of the chair for support of the same.
Inventors
- 👤 Robert M. Cleveland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:05
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/36; A47C7/40; A47C7/44; A47C7/445; A47C3/00; A47C3/02; A47C3/025; A47C3/0252; A47C3/026
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
In a free-floating undercarriage for a chair having forward and backward rocking, sidewise-tilt and swivel axes, the combination with a swivel means comprising: (a) a plurality of open-ended, U-shaped leaf-springs straddle-mounted between the chair and the swivel means on each side of the sidewise-tilting axis, each spring having its flexural axis in coincidental relation with the rocking axis of the chair and intersecting the swivel axis of the same and each spring having parallel legs opening in a direction facing rearwardly of the chair; and (b) a single open-ended, U-shaped leaf-spring likewise mounted between the chair and swivel means coincident with the sidewise-tilt axis of the chair having its flexural axis in like coincidental relation with the rocking axis of the chair and intersecting the swivel axis of the same and parallel legs opening in a direction facing forwardly of the chair.
Claim 2
Dependent Claim
142 words
In a free-floating undercarriage for a chair having forward and backward rocking, sidewise-tilt and swivel axes, the combination with a swivel means comprising: (a) a plurality of open-ended, U-shaped leaf-springs straddle-mounted between the chair and the swivel means on each side of the sidewise-tilting axis, each spring having its flexural axis in coincidental relation with the rocking axis of the chair and intersecting the swivel axis of the same and each spring having parallel legs opening in a direction facing rearwardly of the chair; and (b) a single open-ended, U-shaped leaf-spring likewise mounted between the chair and swivel means coincident with the sidewise-tilt axis of the chair having its flexural axis in like coincidental relation with the rocking axis of the chair and intersecting the swivel axis of the same and parallel legs opening in a direction facing forwardly of the chair.
Claim 3
Dependent Claim
144 words
In a chair having perpendicular axes for forward and backward rocking, sidewise-tilt and swivel intersecting at a common point, a tilting plate mounted on the under side of the chair, and a base plate mounted on a swivel means supported by the base of said chair, the improvement in mounting of said chair between the tilting plate and the base plate comprising an odd plurality of U-shaped leaf-springs having parallel legs forming open ends of the same, each leg mounting on one of each of said two plates, and each spring having its flexural axis coincident with the rocking axis of the chair and intersecting the swivel axis of the same, one spring of which lies on the sidewise-tilt axis of the chair with its open end directed forward, and the other springs of which straddle-mount said one spring with open ends directed rearward.
Claim 4
Dependent Claim
144 words
In a chair having perpendicular axes for forward and backward rocking, sidewise-tilt and swivel intersecting at a common point, a tilting plate mounted on the under side of the chair, and a base plate mounted on a swivel means supported by the base of said chair, the improvement in mounting of said chair between the tilting plate and the base plate comprising an odd plurality of U-shaped leaf-springs having parallel legs forming open ends of the same, each leg mounting on one of each of said two plates, and each spring having its flexural axis coincident with the rocking axis of the chair and intersecting the swivel axis of the same, one spring of which lies on the sidewise-tilt axis of the chair with its open end directed forward, and the other springs of which straddle-mount said one spring with open ends directed rearward.
References Cited (Backward Citations)
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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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |