Method and apparatus for structural attachment of...

B - Operations – Transporting – 65 – D

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B65D 88/14 (2006.01) B65D 6/00 (2006.01) B65D 88/24 (2006.01) F16B 5/02 (2006.01) F16B 5/12 (2006.01)

Patent

CA 2063392

In order to be able to utilize polycarbonate sheet material (12) as a structural (i.e. stress-bearing) component in an assembly comprising polycarbonate (12) and metal (10) components, as, for example, in a monocoque air cargo container wherein the polycarbonate sheet material (12) is used as the "skin" of the structure, an attachment assembly is utilized to provide a rigid, stress-bearing joint without inducing crack-inducing high levels of localized stress on the polycarbonate sheet (12). The attachment assembly (14) comprises a significant area of overlap between the polycarbonate (12) and metal (10) components, and an attachment strip (14) which substantially covers the attachment area, Rivets or bolts (16) are inserted through oversized holes in the metal (10), polycarbonate (12), attachment strip assembly (14) and then torqued. The compressive forces exerted thereby create the rigid joint (even in an environment where the joint is subject to 180 °F~ temperature cycling such that the different coefficients for thermal expansion for the polycarbonate vs. the metal become significant) but are spread over a sufficiently large area so as to avoid high, localized stress levels which would induce the polycarbonate to crack.

Afin de pouvoir utiliser des plaques de polycarbonate (12) en tant qu'élément structurel (c.-à-d. soumis à des contraintes) dans un ensemble comprenant des éléments de polycarbonate (12) et métallique (10) comme, par exemple, dans un conteneur pour frêt aérien monocoque dans lequel le polycarbonate en plaques (12) est utilisé comme "peau" de la structure, on utilise un ensemble de fixation de manière à obtenir une jointure rigide, soumise à des contraintes, sans induire des degrés élevés de contraintes localisées, provoquant des fêlures, sur la plaque de polycarbonate (12). L'ensemble de fixation (14) comporte une zone considérable de chevauchement entre les éléments de polycarbonate (12) et métallique (10) et une bande de fixation (14) qui recouvre pratiquement la zone de fixation. Des rivets ou des chevilles (16) sont insérés dans des trous surdimensionnés percés dans le métal (10), le polycarbonate (12) et l'ensemble bande de fixation (14), puis soumis à un effet de torsion. Les forces de compression ainsi exercées créent la jointure rigide (même dans un environnement ou ladite jointure est soumise à un cycle de température de U180 °F de telle sorte que les différents coefficients d'expansion thermique pour le polycarbonate par rapport au métal deviennent significatifs), mais elles sont réparties sur une zone suffisamment grande de manière à éviter des degrés de contrainte élevés et localisés qui provoqueraient la fêlure du polycarbonate.

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