Self-supporting cable

Details Self-supporting cable Self-supporting cable

1999-06-21

2001-09-11

Reichard, Dean A. (Department: 2831)

Electricity: conductors and insulators

Conduits, cables or conductors

Conductive armor or sheath

C174S10500R, C174S1050SC

Reexamination Certificate

active

06288339

ABSTRACT:

FIELD OF INVENTION
The present invention relates to self-supporting cables.
BACKGROUND OF THE INVENTION
As will be evident from FI 33129 and EP 0 461 794, for instance, it is known to make aerial cables self-supporting by integrating a support line in the cable. It is also known to provide cables of improved tensile strength by embedding tension force relieving members in the cable insulation, c.f. U.S. Pat. No. 4,956,523. It is also known to provide a cable of high tensile strength, by placing a reinforcement comprising, e.g., glass fibre wires immediately inwards of the outer jacket; c.f. DE 17 90 251 or EP 0 268 286.
SE 8105835-6 teaches a cable that includes a shield band about each insulated conductor of the cable. The cable is not self-supporting, however.
SUMMARY OF THE INVENTION
One problem with known self-supporting cables is that they consist of many different insulated conductors or many different layers. This makes the cable expensive and complicated to manufacture, and in some cases difficult to install.
One object of the present invention is to provide a self-supporting cable that can withstand the strain caused by a falling tree, for instance.
Another object of the present invention is to provide a self-supporting cable of simple and inexpensive manufacture and which can be easily installed.
These objects are achieved in accordance with the invention with a cable that comprises at least one insulated conductor where each insulated conductor includes a conductor that has a conductor insulation. A longitudinally extending shield band provided with grooves or corresponding undulations is applied around each insulated conductor, either completely or partially. The cable includes an outer extruded jacket. As the jacket is extruded, corresponding undulations are also formed in the jacket and in the conductor insulation. The undulations on the various cable conductors grip into one another when the cable is subjected to mechanical load, so as to prevent sliding or slippage between the various conductors. This enables the load generated by the weight of the cable to be transferred inwardly to the cable conductors as an axially directed force that the conductors carry by virtue of its inherent mechanical strength among other things.
The inventive self-supporting cable has the advantages of being simple and inexpensive in manufacture and of being easily installed. Other advantages are that the cable need not be made round and that the shield bands form a mechanical protection that is particularly effective against punctiform pressures.
The invention will now be described in more detail with reference to preferred exemplifying embodiments thereof and a also with reference to the accompanying drawings.


REFERENCES:
patent: 4256921 (1981-03-01), Bahder
patent: 4378462 (1983-03-01), Arnold et al.
patent: 4749823 (1988-06-01), Ziemek et al.
patent: 4780574 (1988-10-01), Neuroth
patent: 4956523 (1990-09-01), Pawluk
patent: 5191173 (1993-03-01), Sizer et al.
patent: 5527995 (1996-06-01), Lasky
patent: 1 790 251 (1972-01-01), None
patent: 0 268 286 (1987-11-01), None
patent: 0 461 794 (1991-12-01), None
patent: 33 129 (1963-10-01), None

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