Monitoring of support in elevator installations

1. A support for an elevator installation, comprising: a plurality of electrically conductive tensile carriers arranged parallel to one another; a casing enclosing the tensile carriers wherein the tensile carriers extend along a longitudinal axis of the support, and wherein the tensile carriers are freed at least partly from the casting on a section along the longitudinal axis of the support; and a plurality of contact elements for electrical contacting of the tensile carriers, each of the contact elements being permanently fastened to the tensile carriers at the section to form a permanent connection between the contact element and the tensile carrier; wherein the contact elements are fastened to the tensile carriers by at least one of soldered, welded, glued and permanently deformed by a mechanical action.

2. The support according to claim 1 wherein the contact elements project away from the tensile carriers substantially perpendicularly to the longitudinal axis of the support.

3. The support according to claim 1 wherein the contact elements project away from the tensile carriers substantially perpendicularly to a traction side of the support.

4. The support according to claim 1 wherein at least one of the contact elements is arranged at each of the tensile carriers.

5. The support according to claim 1 wherein adjacent ones of the contact elements are arranged offset relative to one another with respect to the longitudinal axis of the support.

6. The support according to claim 1 including a cover element arranged over the tensile carriers at the section and configured so that substantially only locations of the tensile carriers at which the contact elements are fastened are freed from the cover element.

7. The support according to claim 1 wherein the section measures in a range of 5 to 100 millimeters in a direction of the longitudinal axis of the support.

8. An elevator installation with a support according to claim 1 suspending an elevator car.

9. A plug for electrical tapping of a support according to claim 1 , the plug including a base and a cover, wherein when the support with the contact elements is arranged in the base the support is movable in a direction of the longitudinal axis and transversely to the longitudinal axis, wherein the cover includes connecting elements, wherein when the cover is arranged on the base the support aligns in the base whereby the connecting elements come into contact with the contact elements, and when the cover and base are fastened to one another the connecting elements are held in contact with the contact elements.

10. The support according to claim 1 wherein each of the contact elements forms a material couple with one of the tensile carriers, the material couple requiring a force to separate.

11. The support according to claim 1 wherein each of the contact elements at least partly engages around one of the tensile carriers.

12. The support according to claim 1 wherein each of the contact elements includes two limbs that clasp around one of the tensile carriers.

13. The support according to claim 12 wherein each of the contact elements includes a metal plate that is bent to create the two limbs that clasp around one of the tensile carriers.

14. The support according to claim 13 wherein each of the contact elements is spot welded to one of the tensile carriers.

15. A method of monitoring a state of tensile carriers in a support, wherein the support includes a plurality of the tensile carriers arranged parallel to one another and a casing enclosing the tensile carriers, comprising the steps of: at least partly freeing the tensile carriers on a section of the support; permanently fastening contact elements to the tensile carriers in the freed section of the support means to form permanent connections between the contact elements and the tensile carriers and for electrical contacting of the tensile carriers; installing the support in an elevator installation; connecting the contact elements with a monitoring unit; and determining an electrical characteristic value of the tensile carriers with the monitoring unit for monitoring the state of the tensile carriers; wherein the contact elements are fastened to the tensile carriers by at least one of soldered, welded, glued and permanently deformed by a mechanical action.

16. The method according to claim 15 wherein for the freeing of the tensile carriers the casing at the section is at least one of brushed, cut by water jet, melted, removed by laser and a portion of the casing is at least partly pulled off the tensile carriers.

17. The method according to claim 15 wherein the casing is initially brushed at the section, then cut by water jet and then brushed again.

18. The method according to claim 15 wherein before or after fastening of the contact elements to the tensile carriers, a cover element is arranged over the tensile carriers so that substantially only locations of the tensile carriers at which the contact elements are arranged are freed.