Stock material or miscellaneous articles – Patched hole or depression
Patent
1984-10-29
1989-04-11
Epstein, Henry F.
Stock material or miscellaneous articles
Patched hole or depression
52514, 156 98, 206582, 428116, B32B 310, E04G 2302
Patent
active
048205648
ABSTRACT:
A repair patch kit for repairing holes in panels of composite materials includes a bolt having a rigid washer of about the same diameter as the hole to be repaired. The rigid washer bears against a flexible washer that is substantially larger than the hole. The flexible washer has radiating flukes extending from a central hub region. The flukes can bend when the flexible washer is pushed through the hole and then spring back to their original shape on the blind-side. One edge of the flukes is curved which causes the flukes to twist and present only one edge to the edge of the hole as the flexible washer is pushed through, to facilitate passage of the flexible washer through the hole. A set of resin-impregnated fabric plies is pushed through the hole behind the flexible washer on the bolt and is pressed against the marginal regions of the hole on the blind side of the panel by the flexible washer. The hole is packed full of resin-impregnated fill material or a plug cut from a similar panel, and a set of resin-impregnated repair plies is pressed over the fill material and against the near side of the panel around the marginal regions of the hole by a back-up plate on the bolt. The entire assembly is squeezed tight against the panel by a nut on the bolt and held in place while the resin cures, after which the nut and plate are removed and the bolt is cut off flush with the near side panel surface.
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Repair Guide for Large Area Composite Structure Repair Dated Mar. 1979, by J. D. Labor and S. H. Myhre.
"Boeing 767 Structural Repair Manual", dated Jun. 10, 1984, pp. 22-24 and 43-45.
Cologna Rudy L.
Eng Melvin D.
Epstein Henry F.
Neary J. Michael
The Boeing Company
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