US4530197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thick core sandwich structures and method of fabrication thereof
Assignee: Boeing North American Inc
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Filing: 1983-06-29
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Granted: 1985-07-23
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Expires: 2003-06-29
Abstract
Abstract A thick metallic sandwich structure having improved strength properties is formed by superplastic forming and selective metallurgical bonding. The structure normally includes at least five sheets (including two face sheets and at least three core sheets), wherein portions of the core sheets are bonded together to form a partially layered core.
Inventors
- 👤 Gilles Rainville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:03
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/06; B64C1/08; B21; B21D; B21D47/00; B23; B23K; B23K20/00; B23K20/18; B64C2001/0054; B64C2001/0081; Y; Y02; Y02T; Y02T50/00; Y02T50/40
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
167 words
A metallic sandwich structure comprising: a first face sheet; a second face sheet spaced from said first face sheet; a first core sheet member positioned between said face sheets and metallurgically bonded at a plurality of first face nodes to said face sheets such that said first core sheet member extends transversely and linearly with substantially no eccentricity from one face sheet to the other in alternate sequence; and a second core sheet member positioned between said face sheets and metallurgically bonded at a plurality of second face nodes to said face sheets such that said second core sheet member extends transversely and linearly with substantially no eccentricity from one face sheet to the other in alternate sequence, said second face nodes positioned in alternate sequence along respective face sheets with said first face nodes, said second core sheet member being metallurgically bonded to said first core sheet member at a plurality of core nodes such that transverse support is provided to said first core sheet member.
Claim 2
Dependent Claim
167 words
A metallic sandwich structure comprising: a first face sheet; a second face sheet spaced from said first face sheet; a first core sheet member positioned between said face sheets and metallurgically bonded at a plurality of first face nodes to said face sheets such that said first core sheet member extends transversely and linearly with substantially no eccentricity from one face sheet to the other in alternate sequence; and a second core sheet member positioned between said face sheets and metallurgically bonded at a plurality of second face nodes to said face sheets such that said second core sheet member extends transversely and linearly with substantially no eccentricity from one face sheet to the other in alternate sequence, said second face nodes positioned in alternate sequence along respective face sheets with said first face nodes, said second core sheet member being metallurgically bonded to said first core sheet member at a plurality of core nodes such that transverse support is provided to said first core sheet member.
Claim 3
Dependent Claim
26 words
The structure of claim 1 wherein opposite each first face node on either face sheet is aligned on the other face sheet a face second node.
Claim 4
Dependent Claim
17 words
The structure of claim 2 wherein said core nodes are positioned transversely relative to said face nodes.
Claim 5
Dependent Claim
22 words
The structure of claim 1 wherein said first core sheet member and said second core sheet member have substantially the same thickness.
Claim 6
Dependent Claim
20 words
The structure of claim 1 wherein said first core sheet member is substantially thicker than said second core sheet member.
Claim 7
Dependent Claim
21 words
The structure of claim 1 wherein said first core sheet member is layered and said second core sheet member is unlayered.
Claim 8
Dependent Claim
162 words
A metallic sandwich structure comprising: a first face sheet; a second face sheet spaced from said first face sheet; a first core sheet member positioned between said face sheets and metallurgically bonded at a plurality a first face nodes to said face sheets such that said first core sheet member extends transversely from one face sheet to the other in alternate sequence; and a second core sheet member positioned between said face sheets and metallurgically bonded at a plurality of second face nodes to said face sheets such that said second core sheet member extends transversely from one face sheet to the other in alternate sequence, said first core sheet member being substantially thicker than said second core sheet member, said second face nodes positioned between said first face nodes, said second core sheet member being metallurgically bonded to said first core sheet member at a plurality of core nodes such that transverse support is provided to said first core sheet member.
Claim 9
Dependent Claim
162 words
A metallic sandwich structure comprising: a first face sheet; a second face sheet spaced from said first face sheet; a first core sheet member positioned between said face sheets and metallurgically bonded at a plurality a first face nodes to said face sheets such that said first core sheet member extends transversely from one face sheet to the other in alternate sequence; and a second core sheet member positioned between said face sheets and metallurgically bonded at a plurality of second face nodes to said face sheets such that said second core sheet member extends transversely from one face sheet to the other in alternate sequence, said first core sheet member being substantially thicker than said second core sheet member, said second face nodes positioned between said first face nodes, said second core sheet member being metallurgically bonded to said first core sheet member at a plurality of core nodes such that transverse support is provided to said first core sheet member.
Claim 10
Dependent Claim
26 words
The structure of claim 7 wherein opposite each first face node on either face sheet is aligned on the other face sheet a second face node.
Claim 11
Dependent Claim
17 words
The structure of claim 8 wherein said core nodes are positioned transversely relative to said face nodes.
Claim 12
Dependent Claim
15 words
The structure of claim 7 wherein there is a plurality of second core sheet members.
Claim 13
Dependent Claim
21 words
The structure of claim 7 wherein said first core sheet member is layered and said second core sheet member is unlayered.
Claim 14
Dependent Claim
97 words
A metallic sandwich structure which comprises: two face sheets; a layered core portion which is positioned between and metallurigically bonded to both of said face sheets forming face nodes, said layered core portion continuously running between said face sheets and forming acute angles relative to said face sheets; and an unlayered core portion which is positioned between said face sheets and metallurgically bonded to said face sheets forming face nodes, said unlayered core portion continuously running between said face sheets forming acute angles relative to said face sheets, and contacting said layered core portion forming core nodes.
Claim 15
Dependent Claim
97 words
A metallic sandwich structure which comprises: two face sheets; a layered core portion which is positioned between and metallurigically bonded to both of said face sheets forming face nodes, said layered core portion continuously running between said face sheets and forming acute angles relative to said face sheets; and an unlayered core portion which is positioned between said face sheets and metallurgically bonded to said face sheets forming face nodes, said unlayered core portion continuously running between said face sheets forming acute angles relative to said face sheets, and contacting said layered core portion forming core nodes.
Claim 16
Dependent Claim
28 words
The sandwich structure of claim 12 wherein said layered core portion is formed from two metal sheets and said unlayered core portion is formed from one metal sheet.
Claim 17
Dependent Claim
20 words
The sandwich structure of claim 13 wherein said face nodes along each face sheet alternate between layered and unlayered portions.
Claim 18
Dependent Claim
23 words
The sandwich structure of claim 13 wherein the distance between said face sheets is in the range of 21/4 inches to 41/4 inches.
Claim 19
Dependent Claim
27 words
The sandwich structure of claim 12 wherein said acute angles between said core portion and said face sheets are in the range of 50 to 65 degrees.
Claim 20
Dependent Claim
20 words
The sandwich structure of claim 12 wherein there is either a layered portion or an unlayered portion between successive nodes.
Claim 21
Dependent Claim
38 words
The sandwich structure of claim 12 wherein opposite a face node in which a layered core portion contacts a face sheet, is aligned an opposing face node in which an unlayered core portion contacts said other face sheet.
Claim 22
Dependent Claim
13 words
The sandwich structure of claim 12 wherein said face sheets are substantially parallel.
Claim 23
Dependent Claim
16 words
The sandwich structure of claim 12 wherein said face sheets are positioned to be substantially concentric.
Claim 24
Dependent Claim
25 words
The sandwich structure of claim 12 wherein a portion of one of said face sheets forms an oblique angle relative to said other face sheet.
Claim 25
Dependent Claim
20 words
The sandwich structure of claim 12 wherein said unlayered core portions are substantially as thick as said layered core portions.
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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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |