Patent US3833952A successfully refreshed from Google Patents.
US3833952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonlinear energy absorption system
Assignee: United States Department of the Navy
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Filing: 1973-01-18
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Granted: 1974-09-10
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Expires: 1993-01-18
Abstract
Abstract A military aircraft ejection seat providing normal cushion comfort under ordinary conditions of use and effectively absorbing the inertial energy of the pilot when the seat ejects and undergoes a square wave acceleration. The seat comprises a plurality of cylindrical shaped cushion-like rate nonlinear support elements between a metal seat pan and the buttocks of a pilot. The cushion-like supports are arranged in a hexagonal pattern and are provided with a helical spring that cushions the pilot in ordinary flight conditions and a flow-dilatant suspension that substantially resists compression only during high rates of compression.
Inventors
- 👤 B Rosenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:18
CPC Classifications
A; A47; A47C; A47C7/00; A47C7/02; A47C7/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
A suspension system comprising: a closed non-porous elastic container; spring means placed in said container for providing support under normal loading; and a flow-dilatant mixture placed in and filling said container for providing support under shock loading.
Claim 2
Dependent Claim
37 words
A suspension system comprising: a closed non-porous elastic container; spring means placed in said container for providing support under normal loading; and a flow-dilatant mixture placed in and filling said container for providing support under shock loading.
Claim 3
Dependent Claim
15 words
A suspension system according to claim 1 wherein said spring means comprises a coil spring.
Claim 4
Dependent Claim
22 words
A suspension system according to claim 2 wherein: said flow-dilatant mixture has an approximate characteristic flow rate of 3 inches per second.
Claim 5
Dependent Claim
27 words
A suspension system according to claim 3 further comprising: a plurality of said containers laterally spaced from each other to constrain lateral expansion at steady above-normal loading.
Claim 6
Dependent Claim
74 words
An aircraft ejection seat comfort cushion comprising: an air permeable cover; a plurality of rigid top plates; a plurality of closed non-porous elastic containers arranged adjacent and beneath each of said rigid top plates; a plurality of coil springs with at least one coil spring enclosed in each of said plurality of containers; a flow-dilatant mixture enclosed in and filling each of said plurality of containers; and a base adjacent and underneath said containers.
Claim 7
Dependent Claim
74 words
An aircraft ejection seat comfort cushion comprising: an air permeable cover; a plurality of rigid top plates; a plurality of closed non-porous elastic containers arranged adjacent and beneath each of said rigid top plates; a plurality of coil springs with at least one coil spring enclosed in each of said plurality of containers; a flow-dilatant mixture enclosed in and filling each of said plurality of containers; and a base adjacent and underneath said containers.
Claim 8
Dependent Claim
23 words
An aircraft ejection seat comfort cushion according to claim 5 wherein each of said containers has the shape of a right circular cylinder.
Claim 9
Dependent Claim
25 words
An aircraft ejection seat comfort cushion according to claim 6 wherein: said flow-dilatant mixture has an approximate characteristic flow rate of 3 inches per second.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |