| 摘要 |
<p>A sheet is described in a packaging for electrical or electronic components, for instance a racking system, a module, a housing, a component mounting, a mounting frame or a housing. The sheet is unsupported along an edge and, in its own right, tends to bow along said edge under its own weight or under component loads. The said edge of the sheet is stiffened by a stiffener member hingedly attached to said edge and the stiffener member can be hingedly swung between first and second positions in which it respectively does not project beyond the plane of one surface and the opposite surface of said sheet.</p> |
