Multi-ply woven article having stiffening elements between double plies
US3965942A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 9, 1974 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Oct 9, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24744
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A multi-ply woven article has stiffening elements positioned within pockets formed by double plies of the article to provide the article with substantial strength and rigidity. The double plies may comprise a generally parallel pair of rib plies which extend between the opposite faces of the article in generally zig zag fashion to form a plurality of intermediate rib portions, or a pair of generally parallel, spaced apart face plies forming each of the opposite faces of the article, or both. The various stiffening elements may comprise one or more layers of relatively stiff material. The various layers comprising each stiffening element may comprise unidirectional fibers or materials oriented relative to the woven article so as to impart maximum strength in selected directions. In a preferred method of making woven articles in accordance with the invention the multi-ply fabric is woven and the individual stiffening elements are made, after which the woven fabric is resin impregnated, the pockets thereof filled with the stiffening elements and open spaces in the fabric filled with mandrels. Thereafter the fabric is cured and the mandrels subsequently removed to form the finished art…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.