disclosed in u s pat no 6 437 244 the entire disclosure of which is incorporated herein by reference unlike the hinge of the 39 244 disclosure which is embodied in the edge of an extruded duct of uniform cross section the present invention includes a hinge formed by a curved lip on an integrally molded piece since a molded piece does not have the constraint of being uniform in cross section the present cable manager may be molded with the beneficial hinge construction formed into only particular fingers of the manager rather than requiring the hinge to occupy an entire edge as is necessary with an extruded piece for example it has been found to be beneficial to include at least one finger having the curved lip geometry at or near each end of the cable manager on each side thereof such an arrangement is ascertainable from fig3 12 and 13 in such a design the edge of the cover can engage the curved lip on each of the specially configured fingers and any intermittent fingers with similar design if desired to releasibly and rotatably attach the cover to the manager a preferred variation of the curved lip finger configuration for an integrally molded manager is shown in fig2 and in less detail in fig2 and 23 26 it includes one or more support ribs 80 disposed near the complex curved lip of the specially configured fingers in the embodiment shown in the figures there are three support ribs the ribs may strengthen the hinges on which they are present so that the plastic deforms or rotates less.