Energy guiding chain

1. Energy guiding chain for guiding hoses and cables comprising,

a number of chain links connected to each other in articulated fashion that are formed by mutually parallel side straps, said side straps having an inside and a narrow face are connected to form parallel side strap strands, said chain links having a length and an outer side;

and cross-members connecting said side strap strands, where the side straps can be pivoted relative to each other about a pivoting axis common to two adjacent side straps, where the energy guiding chain can be traversed in such a way that it forms an upper strand, a lower strand, the upper and lower strand being connected in a loop via a deflection zone, said loop having an inside and where the upper strand lies on the lower strand,

and where rollers are provided on at least some chain links of the upper strand and/or the lower strand, these rollers being arranged in such a way that they roll on running surfaces provided on the chain links of the opposite strand when the energy guiding chain is traversed, said rollers including an axis of rotation;

characterized in that the axis of rotation of each of the rollers coincides with said pivoting axis of said two adjacent side straps.

2. Energy guiding chain according to claim 1 , characterized in that some of said chain links are rollerless and the chain links provided with rollers have the same length as the rollerless chain links.

3. Energy guiding chain according to claim 1 , characterized in that the rollers are mounted on the outer side of the chain links, and in that said sides of the side straps on the inside of the loop are provided with wider areas as running surfaces for the rollers.

4. Energy guiding chain according to claim 1 , characterized in that the rollers are integrated on the inside of the side straps.

5. Energy guiding chain according to claim 1 , characterized in that the side strap strands predominantly consist of mutually identical straps, each of which includes a first connecting area and a second connecting area, and in that the straps are integrated in the strands.

6. Energy guiding chain according to claim 5 , characterized in that the straps consist of

a first side strap including an area that can be connected to a rollerless side strap, and a tongue bearing at least one roller, and

a second side strap including an area that can be connected to a rollerless side strap, and a guide area, where the tongue can be connected to the guide area such that both side straps can be pivoted about an axis coinciding with the axis of the roller.

7. Energy guiding chain according to claim 6 , characterized in that the areas of the first and second side strap complement each other.

8. Energy guiding chain according to claim 6 , characterized in that the guide area consists of one or two cheeks, which can accommodate means for connecting the tongue in pivoting fashion.

9. Energy guiding chain according to claim 8 , characterized in that the tongue can be inserted between two cheeks, where the at least one roller partly projects from the guide area.

10. Energy guiding chain according to claim 6 , characterized in that two rollers are present, being attached on both sides of the tongue.

11. Energy guiding chain according to claim 6 , characterized in that the at least one roller is fitted on pins on the tongue.

12. Energy guiding chain according to claim 6 , characterized in that the at least one roller is mounted in ball bearings.

13. Energy guiding chain according to claim 7 , characterized in that the means for connecting the tongue are disks that can be inserted in a corresponding opening in the cheek and fastened on the tongue.

14. Energy guiding chain according to claim 1 , characterized in that the pivoting axis for the adjacent side straps is closer to the running surface than to the narrow face of the side straps opposite the running surface.