Spring cable

Abstract

The invention discloses a spring cable which comprises a cable core and a sheath which is wrapped around an outside surface of the cable core. A cross section of the sheath is not circular, and two parts of the sheath are not asymmetry in shape and have different thicknesses with an axial plane of the spring cable as a boundary. When the cable is bended, the cable always extends or retracts along a position with a weakest stress, thus one end with thicker sheath is always arranged at the inner side during cable bending, when the cable is coiled or loaded to a disk, the end with the thicker sheath retracts at the inner side of the cable automatically, coils and retracts directionally and automatically, a bending stress and a torsional stress generated by the cable can be uniformly distributed on the entire length of the cable, the concentration of the bending stress is reduced, partial damage of the cable is avoided, and a service life of the cable is greatly raised.

Description

technical field [0001] The invention relates to a cable, in particular to a spring cable. Background technique [0002] Spring cables are usually used for vertical and horizontal reciprocating and rotating equipment, such as mobile equipment or lighting power and control lines for film and television stages, audio-visual education, and gymnasiums. During frequent movement, the cable needs to be stored when the device is close to the power line, and stretched out when the device is far away from the power source. In this process, the cable is not only subjected to the pulling or pushing force of the traction, but also the bending stress of the cable and the torsional stress along the axis of the cable. Ordinary spring cables will be wound in random directions during the contraction process, and sometimes the cables will be entangled together, causing the phenomenon that the bending radius of the local point is too small. Due to the frequent crossing of the bending stress and...

AI Technical Summary

Problems solved by technology

The spring steel wire produced by this process is attached to the inner side of the cable, although the contact with the insulator is reduced, but for the connection between the spring steel wire and the cable, due to the different elastic modulus of the material of the spring steel wire and the cable connection, in the long-term bending and During the stretching process, the fatigue difference between the steel wire and the connecting body will still easily occur, causing the relative displacement of the connecting part to cause fracture, resulting in the separation of the spring steel wire and the cable core, and the loss of the function of the spring steel wire

[0007] In order to solve the problem that the mechanical stress generated by the cable can be evenly distributed on the cable during the contraction and stretching process, instead of applying the mechanical stress to the local point of the cable, the Chinese patent document CN101807779 discloses "A Cable Tray". The traveling distance of the cable is evenly distributed in the hanging wire device, and the connection spring is added to each wire device. The purpose is to use the stretching ability of the spring to evenly distribute the mechanical stress and prolong the service life of the cable. The cost increases, the mechanism is complicated, and this method is only suitable for horizontal back-and-forth movement, not suitable for slope or vertical movement

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