Merged channel units e.g. bending units, for formation of closed channel, have inserting and closure parts with ring openings and slots, which enable engagement of units below overlapping breadth that is different at circumference of parts

摘要

The units (1, 2, 3) have an inserting part (4) and a closure part (5), which are provided with ring openings (7) and slots (8) that are fitted at one of axial end areas of the parts. The openings and slots cause overlapping of the coupled axial end areas of the joined together channel units. The openings and slots enable engagement of the channel units below overlapping breadth that is different at the circumference of the parts.