US3583759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded chair shell
Assignee: JJB ACQUISITION Corp A CORP OF
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Filing: 1969-10-16
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Granted: 1971-06-08
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Expires: 1989-10-16
Abstract
Abstract An ell-shaped i.e. L-shaped, molded plastic shell comprising a seat portion and a back portion, both joined by an integral concavoconvex nonflanged waist portion is provided with stiffening structure medial of the waist portion.
Inventors
- 👤 Gideon A Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:42
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/12; A47C5/00; A47C5/04; A47C5/06; A47C5/12; A47C7/00; A47C7/02; A47C7/029; A47C7/16; Y; Y10; Y10S; Y10S297/00; Y10S297/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
In a chair, comprising: an ell-shaped chair shell of fiberglass-reinforced molded plastic material having a seat portion and a back portion integrally joined thereto by a flexible concavoconvex waist portion; said shell being secured by resilient mounts to supporting frame structure at two points laterally spaced apart and located beneath the seat portion and at one centrally located point behind the back portion; the resilient mounts as said points permitting the concavoconvex waist portion to cup as the relative positions of the seat and back portions change under loading; and the improvement, comprising: flexible means separated from said frame by said mounts and in close proximity to said shell; said flexible means extending between said one centrally located point and each of said two laterally spaced apart points and imparting to said shell, medial of said waist portion, a flexural rigidity appreciably greater than the flexural rigidity of the margins of said waist portion.
Claim 2
Dependent Claim
154 words
In a chair, comprising: an ell-shaped chair shell of fiberglass-reinforced molded plastic material having a seat portion and a back portion integrally joined thereto by a flexible concavoconvex waist portion; said shell being secured by resilient mounts to supporting frame structure at two points laterally spaced apart and located beneath the seat portion and at one centrally located point behind the back portion; the resilient mounts as said points permitting the concavoconvex waist portion to cup as the relative positions of the seat and back portions change under loading; and the improvement, comprising: flexible means separated from said frame by said mounts and in close proximity to said shell; said flexible means extending between said one centrally located point and each of said two laterally spaced apart points and imparting to said shell, medial of said waist portion, a flexural rigidity appreciably greater than the flexural rigidity of the margins of said waist portion.
Claim 3
Dependent Claim
26 words
A chair according to claim 1 in which said flexible means comprises a metallic member positioned closely adjacent the back and bottom surfaces of said shell.
Claim 4
Dependent Claim
32 words
A chair according to claim 1 in which said flexible means comprises fiberglass-reinforcing structure incorporated integrally in said shell and thickening the same medial of said waist portion relative the margins thereof.
Claim 5
Dependent Claim
52 words
A chair according to claim 3 in which said shell, medial of said waist portion has a molded thickness in the range between about 0.175 inch to about 0.250 inch and the margins of said waist portion have a molded thickness in the range between about 0.090 inch and about 0.120 inch.
Claim 6
Dependent Claim
39 words
A chair according to claim 4 in which said shell, medial of said waist portion has a molded thickness of about 0.190 inch and the margins of said waist portion taper therefrom to a thickness of about 0.100 inch.
Claim 7
Dependent Claim
24 words
A chair according to claim 1 in which said frame structure includes stop means operable to limit downward deflection of the forward seat portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |