US3757559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making structural panel bent from laminated honeycomb
Assignee: Raytheon Co
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Filing: 1972-02-09
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Granted: 1973-09-11
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Expires: 1992-02-09
Abstract
Abstract A method is disclosed whereby a sandwich composite panel of other than flat configuration is bent from a flat panel by employing a brake-forming operation. The corners of the bent structural panel are shaped so that the inner and outer skins have substantially the same surface length in the bent panel as in the flat sheet. Thus, the sandwich laminate on either side of the bend is undeformed. The method comprises bending the inner lamination skin to a smaller radius and a longer arc than the outer skin. In the resultant bent structural panel, the surface length of each of the inner and outer skins is substantially the same and is substantially the same as before the bend.
Inventors
- 👤 J Welsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:52
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/01; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
The method of forming a bent structural panel from laminated sandwich panel having a substantially planar outer skin on the outside thereof, an inner skin on the inside thereof, and a core secured to both said outer and inner skins comprising simultaneously: bending said inner skin toward said outer skin so that it is concave from the inside in the area to be bent to a curve of greater arc and smaller radius, as compared to the bend in the outer skin without substantial stretching or compressing of said inner skin, crushing the core between the skins, and bending the outer skin in the region of the bend of the inner skin so that it is concave from the inside without substantial stretching or compressing of said inner skin.
Claim 2
Independent Claim
129 words
The method of forming a bent structural panel from laminated sandwich panel having a substantially planar outer skin on the outside thereof, an inner skin on the inside thereof, and a core secured to both said outer and inner skins comprising simultaneously: bending said inner skin toward said outer skin so that it is concave from the inside in the area to be bent to a curve of greater arc and smaller radius, as compared to the bend in the outer skin without substantial stretching or compressing of said inner skin, crushing the core between the skins, and bending the outer skin in the region of the bend of the inner skin so that it is concave from the inside without substantial stretching or compressing of said inner skin.
References Cited (Backward Citations)
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Cited
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |