US3833259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle seat comprising three foam layers
Assignee: Deere and Co
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Filing: 1972-05-30
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Granted: 1974-09-03
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Expires: 1992-05-30
Abstract
Abstract A vehicle seat comprises three layers of polymer foams, the upper and lower layers being polyurethane and the center layer being polyethylene. The thicknesses and deformation characteristics of the layers of foam are optimized for a given overall seat thickness range so as to interact with an injury model correlating the deformation characteristics of the human spine such that deformation and hence injury to the spine, occasioned by the impacting of the rider''s upper torso upon the seat, will be minimized. A procedure of evaluating a seat in order that the deformation characteristics of the seat may be optimized is set forth.
Inventors
- 👤 R Pershing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:49
CPC Classifications
B; B60; B60N; B60N2/00; B60N2/70; Y; Y10; Y10S; Y10S297/00; Y10S297/01; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/249921; Y10T428/249953; Y10T428/249981
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A vehicle seat comprising: top and bottom layers of open cell polyurethane foam having a density of approximately three pcf and exhibiting an indentation load deflection characteristic requiring approximately 30 lbs./50 in.2, to deflect a sample thereof through 25 percent of its thickness, as determined by SAE recommended practice, SAE J815 for the year 1972; said top and bottom layers sandwiching a center layer of closed-cell polyethylene foam having a density of approximately two pcf and exhibiting an indentation load deflection characteristic requiring approximately 300 lbs./50 in.2, to deflect a sample thereof through 25 percent of its thickness, as determined by said SAE recommended practice; the composite thickness of said layers of foam being no less than four inches nor more than ten inches, said center layer of foam having a thickness between 10 and 25 percent of said composite thickness and being placed in the bottom 60 percent of said composite thickness and said bottom layer being at least three-fourths of an inch thick.
Claim 2
Dependent Claim
165 words
A vehicle seat comprising: top and bottom layers of open cell polyurethane foam having a density of approximately three pcf and exhibiting an indentation load deflection characteristic requiring approximately 30 lbs./50 in.2, to deflect a sample thereof through 25 percent of its thickness, as determined by SAE recommended practice, SAE J815 for the year 1972; said top and bottom layers sandwiching a center layer of closed-cell polyethylene foam having a density of approximately two pcf and exhibiting an indentation load deflection characteristic requiring approximately 300 lbs./50 in.2, to deflect a sample thereof through 25 percent of its thickness, as determined by said SAE recommended practice; the composite thickness of said layers of foam being no less than four inches nor more than ten inches, said center layer of foam having a thickness between 10 and 25 percent of said composite thickness and being placed in the bottom 60 percent of said composite thickness and said bottom layer being at least three-fourths of an inch thick.
Claim 3
Dependent Claim
42 words
The vehicle seat defined in claim 1 wherein the composite thickness of said layers of foam is between four and six inches and the thickness of said center layer of foam is between 20 percent and 25 percent of the composite thickness.
Claim 4
Dependent Claim
54 words
The vehicle seat defined in claim 1 wherein the composite thickness of said layers of foam is between six and eight inches, the thickness of said center layer of foam is between 15 and 20 percent of the composite thickness, and the thickness of the bottom layer of foam is at least one inch.
Claim 5
Dependent Claim
21 words
The vehicle seat defined in claim 3 wherein the thickness of said top layer of foam is at least four inches.
Claim 6
Dependent Claim
61 words
The vehicle seat defined in claim 1 wherein the composite thickness of said layers of foam is between eight and ten inches, the thickness of said center layer of foam is between 10 and 15 percent of the composite thickness, the bottom layer is at least one inch thick and the top layer of foam being at least four inches thick.
Claim 7
Dependent Claim
39 words
The vehicle seat defined in claim 1 wherein the composite thickness of the layers of foam increases from the front to the rear of the seat; said bottom and center layers of foam each being of a constant thickness.
Claim 8
Dependent Claim
34 words
The vehicle seat defined in claim 6 wherein the composite thickness of the layers of foam at a central portion intermediate the front and rear of the seat is between five and seven inches.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |