| 摘要 |
<p>A process for producing box structures for frames for disappearing sliding doors, characterised by: - forming at least one metal sheet having a shape and dimensions corresponding to the plan development of the box structure, - forming creasing lines (14, 16, 18) on the metal sheet along those regions forming the thickness bands in the made-up box structure, - forming mutual engagement means (22, 24) along certain metal sheet edges in those regions making up the corners.</p> |
