Electricity: conductors and insulators – Conduits – cables or conductors – Conductive armor or sheath
Patent
1980-05-06
1982-08-17
Mayewsky, Volodymyr Y.
Electricity: conductors and insulators
Conduits, cables or conductors
Conductive armor or sheath
174109, 174120R, 57212, H01B 718
Patent
active
043451128
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a high strength cable usable undersea, and more particularly to a high strength cable used for electrically (or optically) and mechanically connecting a vessel or a base on the sea with submarine instruments such as various measuring devices or operating machines, for example.
BACKGROUND ART
Such a cable is required to have a high tensile strength and to be able to fully withstand its winding up and its drawing out by a capstan because it is towed by a vessel, wound up on the vessel or pulled in the sea.
Such a conventional cable comprises a cable core transferring a signal or electric power, a lapping tape and an inner sheath on the cable core, a tension member provided on the inner sheath, an interposing member provided on the tension member to control the specific gravity of the cable, and an outer sheath provided on the interposing member with another lapping tape disposed between the interposing member and the outer sheath.
Since the undersea high strength cable has a long length of more than 1,000 m, the cable is stressed by an extremely high tensile force when it is pulled in the sea or wound up. Therefore, the tension member is so designed to fully withstand such a high tensile force. When the cable is wound up on the vessel by a capstan, for example, the drawing force from the capstan is at first applied to the outer sheath, and then transferred to the tension member provided inside the outer sheath. However, in the prior art undersea high strength cable constructed in accordance with the above description, since the interposing member between the outer sheath and the tension member is provided to control the specific gravity, the integrity of the outer sheath with the tension member is incomplete. Thus, it will be found that a high tensile force applied to the outer sheath causes a slight elongation of the outer sheath. This causes a displacement between the outer sheath and the tension member. As such a displacement is accumulated in a longitudinal direction, a portion of the outer sheath is deformed in a bellows manner, and as a result, if the cable is used as it is, the outer sheath will tend to be broken.
DISCLOSURE OF INVENTION
This invention provides a high strength cable usable undersea and comprising an inner sheath provided outside a cable core for transmitting a communication signal or electric power, a tension member of a twisted layer and an outer sheath successively provided on the tension member, characterized in that a lapping tape having a high friction coefficient is provided between the tension member and the outer sheath.
With the invention, since there is provided the lapping tape having a high friction coefficient, displacement between the tension member and the outer sheath does not occur. Thus, the invention provides a high strength submarine cable having an excellent durability.
In the cable of the invention, in case that the tension member comprises a plurality of layers, lapping tape having a high friction coefficient may be preferably provided between the layers of the tension member. With the cable constructed as aforementioned, since no displacement occurs between the layers of the tension member, the tensile force applied to each of the layers is advantageously made uniform.
Furthermore, in the cable of the invention, a lapping tape having a high friction coefficient may be preferably provided between the tension member and the inner sheath. With the cable constructed as aforementioned, the integrity of the inner sheath with the tension member is complete, and as a result, the durability of the cable is improved.
The tension member may be composed of strings of bundled high strength fibers, fiber reinforced plastic rods, and the like.
In case that the tension member comprises the twisted layers of strings of bundled high strength fibers and that the lapping tape is provided on the tension member by tightly winding the tape having a high friction coefficient thereon, the twisted layers of the tension member are made thi
REFERENCES:
patent: 3339007 (1967-08-01), Blodgett
patent: 3485224 (1969-12-01), Ronald
patent: 4069410 (1978-01-01), Kup, Jr.
Kikkawa Satoru
Ohkubo Masanori
Sugata Shigeo
Tachigami Shigeru
Umezu Haruo
Mayewsky Volodymyr Y.
Technical Research and Development Institute, Japan Defence Agen
The Furukawa Electric Co. Ltd.
LandOfFree
High strength cable usable undersea does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High strength cable usable undersea, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High strength cable usable undersea will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-187911