EP0213763A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Energy absorbing foam-fabric laminate
Assignee: Grumman Corp
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Filing: 1986-08-01
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Granted: —
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Expires: 2006-08-01
Abstract
Abstract A lightweight energy-absorbing structure is comprised of a laminate including a plurality of fabrics (l2, l4), pre-impregnated with a thermosetting resin, abutting against a core (l6) of cellular foam treated with a charge of filled bonding material. The resulting mixed materials are compressed between two die members (20, 22) while heat is applied to the dies thereby single curing the thermosetting resin and bonding material. Individual sheets of fabric may have a predetermined orientation to increase impact resistance. In a preferred embodiment polyimide open-cell foam may be employed.
Inventors
- 👤 Samuel J. Dastin
- 👤 Carlos M. Cacho-Negrete
- 👤 John Mahon
- 👤 Leonard M. Poveromo
- 👤 Nicholas Corvelli
- 👤 Arnold London
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 18:59
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B29C70/06; B29C70/08; B29C70/086; B29D; B29D99/00; B29D99/001; B29D99/0021; B32; B32B; B32B38/00; B32B38/08; B32B5/00; B32B5/18; B32B5/22; B32B5/24; B32B5/245; B29K; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/08; B29K2105/0809; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/06; B32B2307/00; B32B2307/50; B32B2307/56
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
A lightweight laminated structure comprising at least first (l2) and second (l4) sheets of fabric pre-impregnated with a resin; a cellular layer (l6) positioned between the fabric sheets, opposite surfaces of the layer being impregnated with a charge of filled resin compatible with the resin of the preimpregnated material and forming a shear resistant bond therewith.
Claim 2
Dependent Claim
56 words
A lightweight laminated structure comprising at least first (l2) and second (l4) sheets of fabric pre-impregnated with a resin; a cellular layer (l6) positioned between the fabric sheets, opposite surfaces of the layer being impregnated with a charge of filled resin compatible with the resin of the preimpregnated material and forming a shear resistant bond therewith.
Claim 3
Dependent Claim
50 words
The structure set forth in claim l wherein a plurality of pre-impregnated sheets (26, 28, 30, 32) (36, 38, 40, 42) are deposited on one another against each surface of the layer (34), and wherein individual sheets have a preselected orientation for increasing the impact resistance of the laminated structure.
Claim 4
Dependent Claim
49 words
The structure set forth in claim l wherein a plurality of spaced cellular layers (34, 44) are employed, the opposite surfaces of each layer having a plurality of pre-impregnated sheets abutting thereagainst, and wherein individual sheets have a preselected orientation for increasing the impact resistance of the laminated structure.
Claim 5
Dependent Claim
17 words
The structure set forth in claim 3 wherein each cellular layer is comprised of polyimide open-cell material.
Claim 6
Independent Claim
80 words
A method for forming a lightweight laminated structure comprising the steps: impregnating (FIG. 5) opposite surfaces of at least one cellular layer with a charge of thermosetting resin; sandwiching (FIG. lA) the cellular layer between at least first and second sheets of fabric pre-impregnated with a bonding material; compressing (FIG. lB) the layer and sheets together to bond them; and applying heat and pressure (FIG. lC) simultaneously for single curing the resin and impregnated material to form an impact-resistant structure.
Claim 7
Independent Claim
80 words
A method for forming a lightweight laminated structure comprising the steps: impregnating (FIG. 5) opposite surfaces of at least one cellular layer with a charge of thermosetting resin; sandwiching (FIG. lA) the cellular layer between at least first and second sheets of fabric pre-impregnated with a bonding material; compressing (FIG. lB) the layer and sheets together to bond them; and applying heat and pressure (FIG. lC) simultaneously for single curing the resin and impregnated material to form an impact-resistant structure.
Claim 8
Dependent Claim
33 words
The method set forth in claim 5 wherein the compressing step is achieved by subjecting the sheets and layer to die members (20, 22) which constrain the structure to a predetermined finished configuration.
Claim 9
Dependent Claim
51 words
The method set forth in claim 5 wherein a plurality of pre-impregnated sheets (26, 28, 30, 32) (36, 38, 40, 42) are deposited on one another against each surface of the layer prior to compressing, and wherein individual sheets have a preselected orientation for increasing the impact resistance of the laminate.
Claim 10
Dependent Claim
17 words
The method set forth in claim 5 wherein the cellular layer is comprised of polyimide open-cell material.
Claim 11
Dependent Claim
48 words
The method set forth in claim 5 wherein a plurality of layers (34, 44) are spaced apart, the opposite surfaces of each layer having a plurality of pre-impregnated sheets abutting thereagainst, and wherein individual sheets have a preselected orientation for increasing the impact resistance of the laminated structure.
Claim 12
Dependent Claim
46 words
l0. The method set forth in claim 6 wherein a plurality of pre-impregnated sheets (26, 28, 30, 32) (36, 38, 40, 42) are deposited on one another prior to compressing, and wherein individual sheets have a preselected orientation for increasing the impact resistance of the laminate.
Claim 13
Independent Claim
17 words
The method set forth in claim l0 wherein each cellular layer is comprised of polyimide open-cell material.
References Cited (Backward Citations)
No citation records indexed.
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