Stock material or miscellaneous articles – Patched hole or depression
Patent
1990-01-04
1991-07-23
Cannon, James C.
Stock material or miscellaneous articles
Patched hole or depression
2940212, 2940215, 52514, 156 92, 156 94, 156 98, 1563074, 206582, 264 36, 428116, B32B 310, B32B 3500
Patent
active
050342541
ABSTRACT:
A repair patch for damaged sections of panels made of composite materials, wherein the damaged section of the panel has been cut out by, for example, a hole cutting saw, includes a bolt which is inserted through the hole and a rigid washer on the bolt, of about the same diameter as the hole. A flexible washer, substantially larger than the hole, is pushed through the hole and the rigid washer bears against it. The flexible washer has radiating flukes, extending from a central hub region, which can bend when the flexible washer is pushed through the hole, and then spring back to about 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 hold 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 sequeezed 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 to produce a flush, smooth patch having load-bearing material over the hole on both sides of the panel.
REFERENCES:
patent: 4588626 (1986-05-01), Cologna et al.
patent: 4820564 (1989-04-01), Cologna et al.
Cologna Rudy L.
Eng Melvin D.
Cannon James C.
Cooper Kenneth J.
The Boeing Company
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