| 摘要 |
A structure is disclosed in which there are uprights to which brackets are releasably attached. Each upright is in the form of an extrusion having a core structure (12) with webs (14) extending outwardly from the core structure (12). There are lips (26) at the outer ends of the webs (14) and these components bound an elongate cavity (30). In the core structure (12) there is a further cavity (18) with a slot-like entrance (24) placing the two cavities (18, 30) in communication. The lips (22) bounding the entrance (24) are cut away at at least one place to widen the entrance (24). The bracket has a head which is received in the cavity (30) and a boss which enters the cavity (18) at the (or one of the) widened part of the entrance (24). In a further form there is an element in the cavity (18) which element extends across the entrance (24) and which has a series of boss receiving apertures therein.
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