Cable, combined cable made of plastic fibers and steel wire strands, and combined strands made of plastic fibers and steel wires

• US 8,176,718 B2
• Filed: 05/15/2008
• Issued: 05/15/2012
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: Wireco Germany GmbH
• Original Assignee: Casar Drahtseilwerk Saar GmbH (Wireco Worldgroup Incorporated)
• Inventors: Das, Cornelis Adrianus, Ridge, Isabel, O'Hear, Nicholas, Grabandt, Otto
• Primary Examiner(s): Hurley, Shaun R
• Application Number:
  US12/451,576
• Publication Number:
  US 20100071340A1
• Time in Patent Office: 1,461 Days
• Field of Search: 572/10, 572/12, 572/30, 87/6, 87/9
• US Class Current: 57/212
• CPC Class Codes: D07B 1/005 Composite ropes, i.e. ropes built-up from fibrous or filamentary material and metal wires
• CPC Class Codes: D07B 1/025 comprising high modulus, or high tenacity, polymer filaments or fibres, e.g. liquid-crystal polymers
• CPC Class Codes: D07B 1/0686 characterised by the core design
• CPC Class Codes: D07B 1/165 characterised by a plastic or rubber inlay
• CPC Class Codes: D07B 2201/102 including a core
• CPC Class Codes: D07B 2201/1032 three to eight strands respectively forming a single layer
• CPC Class Codes: D07B 2201/104 twisted
• CPC Class Codes: D07B 2201/106 Pitch changing over length
• CPC Class Codes: D07B 2201/2023 with core
• CPC Class Codes: D07B 2201/2024 twisted
• CPC Class Codes: D07B 2201/2026 Pitch changing over length
• CPC Class Codes: D07B 2201/2049 having protrusions extending radially functioning as spacer between strands or wires
• CPC Class Codes: D07B 2201/2052 characterised by their structure
• CPC Class Codes: D07B 2201/2057 resulting in a twisted structure
• CPC Class Codes: D07B 2201/2065 comprising a coating
• CPC Class Codes: D07B 2201/2066 characterised by the materials used
• CPC Class Codes: D07B 2201/2068 having a load bearing function
• CPC Class Codes: D07B 2201/2073 in circumferencial direction
• CPC Class Codes: D07B 2201/2074 in radial direction
• CPC Class Codes: D07B 2205/201 Polyolefins
• CPC Class Codes: D07B 2205/2014 : High performance polyolefins, e.g. Dyneema or Spectra
• CPC Class Codes: D07B 2205/2042 : High performance polyesters, e.g. Vectran
• CPC Class Codes: D07B 2205/205 : Aramides
• CPC Class Codes: D07B 2401/2005 : Elongation or elasticity
• CPC Class Codes: D07B 2401/201 : regarding structural elongation
• CPC Class Codes: D07B 2401/205 : Avoiding relative movement of components
• CPC Class Codes: D07B 2801/10 : Smallest filamentary entity of a rope or strand, i.e. wire, filament, fiber or yarn
• CPC Class Codes: D07B 2801/12 : Strand
• CPC Class Codes: D07B 2801/14 : Core
• CPC Class Codes: D07B 2801/20 : Spacer
• CPC Class Codes: D07B 2801/24 : Rope
• CPC Class Codes: D07B 5/12 : of low twist or low tension by processes comprising setting or straightening treatments

Abstract

A combined cable comprising a core cable of high-strength synthetic fibers, which take the form of a twisted bundle of monofilaments or a plurality of twisted bundles of monofilaments, and comprising an outer layer of steel wire strands, is characterized in that the bundle or bundles of monofilaments is or are stretched, with a reduction in diameter, and held in this state by a sheathing, in particular a braided sheathing. The extension under strain of the core cable under load is thereby reduced, so that the load distribution between the cross section of steel and the cross section of synthetic material of the cable improves.

Claims

1. A combined cable comprising a core cable (1, 2) of high strength synthetic fibers and an outer layer of steel wire strands (4, 5), wherein the synthetic fibers are a bundle or a plurality of bundles of monofilaments, which is or are enclosed by a sheathing, wherein the bundle or bundles of monofilaments (1, 6) is or are stretched, with a reduction in diameter, so that the monofilaments are in a final spatial order, forming a stable cross section, wherein the sheathing sits, in a corset-like manner, under prestress on the bundle or the bundles so that the cross section of the bundle or bundles of monofilaments assumed in the stretched state is fixed.

2. The combined cable as claimed in claim 1, wherein the combined, cable is a cable for suspended use over a great difference in height, which is characterized by changing of the length of lay over the length of the cable, in such a way that the load-specific torque of the wire cable decreases upward.

3. The combined cable as claimed in claim 1, wherein the fibers are present as a twisted bundle of monofilaments or as a plurality of twisted bundles of monofilaments.

4. The combined cable as claimed in claim 1, wherein the sheathing (2) is braided.

5. A combined strand comprising a core (6, 7) of high strength synthetic fibers and an outer layer of steel wires (9), wherein the synthetic fibers are a bundle or a plurality of bundles of monofilaments, which is or are enclosed by a sheathing, wherein the bundle or bundles of monofilaments (1, 6) is or are stretched, with a reduction in diameter, so that the monofilaments are in a final spatial order, forming a stable cross section, wherein the sheathing sits, in a corset-like manner, under prestress on the bundle or the bundles so that the cross section of the bundle or bundles of monofilaments assumed in the stretched state is fixed.

6. The combined strand as claimed in claim 5, wherein the fibers are present as a twisted bundle of monofilaments or as a plurality of twisted bundles of monofilaments.

7. The combined strand as claimed in claim 5, wherein the sheathing (2) is braided.

8. A combined cable comprising a core cable (1, 2) of high-strength synthetic fibers and an outer layer of steel wire strands (4;

5), wherein the synthetic fibers are a bundle or a plurality of bundles of monofilaments, which is or are stretched, with a reduction of diameter, so that the monofilaments form a stable bundle cross section, and are enclosed by an incompliant sheathing that fixes, in a corset-like manner, the cross section of the bundle or bundles of monofilaments assumed in the stretched state and, in addition to the sheathing, the combined cable has an intermediate layer (3) of an elastic synthetic material into which the steel wire strands (4;

5) are pressed while spaced apart from one another in such a way that the outer layer extends under load, and contracts radially in order to make strain behavior of the outer layer of steel wire strands approximate strain behavior of the core cable.

9. The combined cable as claimed in claim 8, wherein the intermediate layer (3;

8) is extruded on.

10. A combined strand comprising a core (6, 7) of high-strength synthetic fibers and an outer layer of steel wires (9), wherein the synthetic fibers are a bundle or a plurality of bundles of monofilaments, which is or are stretched, with a reduction of diameter, so that the monofilaments form a stable bundle cross section, and are enclosed by an incompliant sheathing that fixes, in a corset-like manner, the cross section of the bundle or bundles of monofilaments assumed in the stretched state and, in addition to the sheathing, the combined strand has an intermediate layer (8) of an elastic synthetic material into which the steel wires (9) are pressed while spaced apart from one another in such a way that the outer layer extends under load, and contracts radially in order to make strain behavior of the outer layer of steel wire strands approximate strain behavior of the core cable.

11. The combined strand as claimed in claim 10, wherein the outer strand (5) is a combined cable, which has a core cable (1) of high-strength synthetic fibers and an outer layer of strands.