Supporting duct.
A trough for energy guide chains Ä Ü stretches along the chain and has a U-shaped cross-section and on the vertical inner surfaces there are slide bars (24). There are attached to legs on the side of the shell and are detachable. The legs have recesses (30) with undercuts which mate with hook-like projections (34) on the bars. The projections have horizontal (35) and vertical sections (36). <IMAGE>