US4883320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seat structure
Assignee: Ikeda Corp
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Filing: 1988-07-13
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Granted: 1989-11-28
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Expires: 2008-07-13
Abstract
Abstract Resin-made support panels for supporting the ischium torus, lumbar and shoulder blade portions of a person seated are molded integral onto sheet-like springs which are plain-woven by resin fibers, and side rims of the sheet-like springs are connected to frames by means of hooks.
Inventors
- 👤 Satoshi Izumida
- 👤 Katsumi Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:03
CPC Classifications
B; B60; B60N; B60N2/00; B60N2/70; B60N2/7094; A; A47; A47C; A47C7/00; A47C7/02; A47C7/28; A47C7/282
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A seat structure comprising: a seat frame; a back frame; sheet-like springs supported by said seat frame and by said back frame; support panels fixed on each sheet-like spring for supporting selected portions of a person seated on the seat structure; portions extending continuously from sides of each of said sheet-like springs; reinforcing panels connected to said seat frame and to said back frame, each of which is curved slightly upward and fixed on a border between each of said sheet-like springs and each of said extended portions; a strap-like rim piece fixed to an outer side of each of said extending portions; and side support frames fixed to said seat frame and said back frame and to which said rim pieces are hooked.
Claim 2
Dependent Claim
124 words
A seat structure comprising: a seat frame; a back frame; sheet-like springs supported by said seat frame and by said back frame; support panels fixed on each sheet-like spring for supporting selected portions of a person seated on the seat structure; portions extending continuously from sides of each of said sheet-like springs; reinforcing panels connected to said seat frame and to said back frame, each of which is curved slightly upward and fixed on a border between each of said sheet-like springs and each of said extended portions; a strap-like rim piece fixed to an outer side of each of said extending portions; and side support frames fixed to said seat frame and said back frame and to which said rim pieces are hooked.
Claim 3
Dependent Claim
35 words
The seat structure according to claim 1, wherein said support panels are selected to support ischium torus, lumbar and shoulder blade portions of the person seated and said support panels are continuous from one another.
Claim 4
Dependent Claim
153 words
A seat structure comprising: a seat frame; a back frame; sheet-like springs supported by said seat frame and by said back frame; support panels fixed on said sheet-like springs for supporting selected portions of a person seated on the seat structure; portions extending continuously from both sides of each of said sheet-like springs; reinforcing panels connected to the seat frame, each of which is slightly curved upward and fixed on a border between said sheet-like spring and said extending portion; strap-like rim pieces, each fixed to the outer side of each of said extending portions; side support frames fixed to said seat frame and said back frame and to which said rim pieces are hooked; pads for covering said sheet-like springs, support panels, extending portions, reinforcing panels, strap-like rim pieces and side support frames of said seat and back frames; and surface skins provided with a wadding and serving to cover said pads.
Claim 5
Dependent Claim
153 words
A seat structure comprising: a seat frame; a back frame; sheet-like springs supported by said seat frame and by said back frame; support panels fixed on said sheet-like springs for supporting selected portions of a person seated on the seat structure; portions extending continuously from both sides of each of said sheet-like springs; reinforcing panels connected to the seat frame, each of which is slightly curved upward and fixed on a border between said sheet-like spring and said extending portion; strap-like rim pieces, each fixed to the outer side of each of said extending portions; side support frames fixed to said seat frame and said back frame and to which said rim pieces are hooked; pads for covering said sheet-like springs, support panels, extending portions, reinforcing panels, strap-like rim pieces and side support frames of said seat and back frames; and surface skins provided with a wadding and serving to cover said pads.
Claim 6
Dependent Claim
41 words
The seat structure according to claim 3, wherein said support panels are selected to support ischium torus, lumbar and shoulder blade portions of the person seated, are continuous from one another and are fixed onto a sheet of said sheet-like springs.
Claim 7
Dependent Claim
16 words
The seat structure according to claim 3, wherein said support panels are made of synthetic resin.
Claim 8
Dependent Claim
21 words
A seat structure according to claim 3, wherein said sheet-like spring is a sheet of cloth plain-woven by synthetic resin fibers.
Claim 9
Dependent Claim
29 words
The seat structure according to claim 3, wherein said support panels are made of synthetic resin and molded integral to the sheet of cloth plain-woven by synthetic resin fibers.
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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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |