Overhead cable and low sag, low wind load cable

Details Overhead cable and low sag, low wind load cable Overhead cable and low sag, low wind load cable

1995-12-01

1998-01-27

Mansen, Michael

Textiles: spinning, twisting, and twining

Strand structure

Covered or wrapped

57219, D07B 106

Patent

active

057111430

ABSTRACT:
An overhead cable provided with a plurality of segment strands of a sector-shaped cross-section twisted at the outermost layer and having grooves of a substantially arc-shaped cross-section at the surface at the adjoining portions of the segment strands. Also, a low sag, low wind load cable provided with tension-bearing cores comprised of strands having a linear expansion coefficient of -6.times.10.sup.-6 to 6.times.10.sup.-6 /.degree.C. and an elastic modulus of 100 to 600 PGa and with a plurality of sector-shaped cross-section segment strands twisted around the outermost circumference of the cable including the tension-bearing cores comprised of a super-high-heat resisting aluminum alloy or extra-high heat resisting aluminum alloy, grooves of a substantially arc-shaped cross-section being provided at the surface at adjoining portions of the twisted segment strands. This enables the wind load to be reduced. Further, a low wind load cable can be easily fabricated at a low cost. In addition, by using invar strands for the cores and using segment strands of a super-high heat resisting aluminum alloy or extra-high heat resisting aluminum alloy at the outermost layer, the sag at high temperatures can be greatly suppressed. Accordingly, even the amount of the sideways swinging caused when the overhead cable is struck by a strong wind from the lateral direction can be greatly suppressed together with the low wind load construction.

REFERENCES:
patent: 1794269 (1931-02-01), Zagorski
patent: 2022839 (1935-12-01), Austin
patent: 3240082 (1966-03-01), Bratz
patent: 3813772 (1974-06-01), Adams
patent: 3823542 (1974-07-01), Pemberton
patent: 3979896 (1976-09-01), Klett et al.
patent: 4311001 (1982-01-01), Glushko et al.
patent: 5449861 (1995-09-01), Fujino et al.

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