US3886023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural panels of the sandwich type
Assignee: Dassault Aviation SA
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Filing: 1973-03-30
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Granted: 1975-05-27
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Expires: 1993-03-30
Abstract
Abstract A method of producing attachment zones or locations in a sandwich type panel made up of a cellular structure and of flat coverings disposed on both sides of the said structure and adhering to the latter, wherein, in spaced-out zones of this structure, which are approximately circular and have a diameter which is appreciably greater than that of a screw or other component and is, moreover, sufficiently great for each of the said zones to encompass a plurality of contiguous cells, a hardenable compound is poured into the cells in these zones in such a way as to fill them, while the said structure has still not received at least one of its two coverings, and then, after complete attachment of the said coverings and hardening of the compound, the centre of the nodes thus formed is pierced right through by a hole having substantially the shape and diameter necessary for the passage of a screw or other component.
Inventors
- 👤 Henri Deplante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:34
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; B29; B29D; B29D24/00; B29D24/002; B29D24/005; B32B15/00; B32B15/20; E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C2/365; F; F16; F16L; F16L59/00; F16L59/02; F16L59/029; B32B2305/00; B32B2305/02; B32B2305/024; B32B2607/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1003; Y10T156/1052; Y10T156/1056; Y10T156/1057; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24157
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
IN A METHOD OF PRODUCING SANDWICH PANELS BY APPLYING FLAT COVERINGS, EACH INCLUDING PLATE MATERIAL, ON BOTH SIDES OF A CELLULAR HONEYCOMB-LIKE STRUCTURE, THE IMPROVEMENT OF PROVIDING REINFORCED NODES AT SELECTED SPACED APART POINTS OF THE PANEL FOR THE ATTACHMENT THEREOF TO A SUPPORTING STRUCTURE, BY THE STEPS COMPRISING: WHILE SAID CELLULAR STRUCTURE HAS AT LEAST ONE OF ITS SIDES UNCOVERED, COMPLETELY FILING EACH OF A PLURALITY OF ADJOINING CELLS OF SAID STRUCTURE SURROUNDING EACH OF SAID POINTS IN A ZONE HAVING THE NODE POINT AS THE CENTER THEREOF WITH A HARDENABLE FLUID RESIN HAVING GOOD ADHESION TO THE PLASTIC MATERIAL OF THE COVERINGS BY POURING SAID RESIN IN LIQUID STATE INTO EACH OF SAID CELLS, APPLYING THE REMAINING COVERING TO THE CELLULAR STRUCTURE WHILE PLURAL CELLS AT EACH SUCH POINT ARE FILLED EITH SAID FLUID RESIN, HARDENING SAID RESIN AFTER BOTH SAID COVERINGS ARE IN PLACE, AND THEREAFTER, PIERCING THROUGH THE COVERINGS AND THE FILLED CELLULAR STRUCTURE ALONG THE AXIS OF EACH NODE.
Claim 2
Dependent Claim
164 words
IN A METHOD OF PRODUCING SANDWICH PANELS BY APPLYING FLAT COVERINGS, EACH INCLUDING PLATE MATERIAL, ON BOTH SIDES OF A CELLULAR HONEYCOMB-LIKE STRUCTURE, THE IMPROVEMENT OF PROVIDING REINFORCED NODES AT SELECTED SPACED APART POINTS OF THE PANEL FOR THE ATTACHMENT THEREOF TO A SUPPORTING STRUCTURE, BY THE STEPS COMPRISING: WHILE SAID CELLULAR STRUCTURE HAS AT LEAST ONE OF ITS SIDES UNCOVERED, COMPLETELY FILING EACH OF A PLURALITY OF ADJOINING CELLS OF SAID STRUCTURE SURROUNDING EACH OF SAID POINTS IN A ZONE HAVING THE NODE POINT AS THE CENTER THEREOF WITH A HARDENABLE FLUID RESIN HAVING GOOD ADHESION TO THE PLASTIC MATERIAL OF THE COVERINGS BY POURING SAID RESIN IN LIQUID STATE INTO EACH OF SAID CELLS, APPLYING THE REMAINING COVERING TO THE CELLULAR STRUCTURE WHILE PLURAL CELLS AT EACH SUCH POINT ARE FILLED EITH SAID FLUID RESIN, HARDENING SAID RESIN AFTER BOTH SAID COVERINGS ARE IN PLACE, AND THEREAFTER, PIERCING THROUGH THE COVERINGS AND THE FILLED CELLULAR STRUCTURE ALONG THE AXIS OF EACH NODE.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein said hardenable fluid resin is a resin epoxy containing a hardening catalyst therefor.
Claim 4
Dependent Claim
27 words
A method as claimed in claim 1, in which said hardenable fluid resin is thixotropic so that, even before hardening, it remains in the cells filled therewith.
Claim 5
Dependent Claim
22 words
A method as claimed in claim 3, in which the hardenable resin comprises a mixture of fluid resin and finely ground silica.
Claim 6
Dependent Claim
41 words
A method as claimed in claim 1, in which the resin is poured into the cells of the cellular structure before either of said coverings has been secured to the structure, and while said structure is supported on a flat surface.
Claim 7
Dependent Claim
65 words
A method as claimed in claim 1, in which a template having apertures is superimposed upon the said structure for the pouring of the resin into the spaced-apart zones of the cellular structure, the axes of said apertures coinciding with those of the holes to be finally formed in the panel, but having a diameter which is appreciably greater than that of the said holes.
Claim 8
Dependent Claim
45 words
A method as claimed in claim 6, in which after the resin has been hardened in the spaced-apart zones of said structure, the holes are formed in said nodes by means of a drilling gun which is placed on the apertures in the said template.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |