Abstract:
A wire rope is provided which has an independent wire rope core (IWRC) covered by a plastic jacket. Outer strands are laid on this plastic jacket and wormings or spacers extend from the plastic jacket in between the outer strands to form gaps between the outer strands. Another jacket is provided over the outer strands which also fills the gaps between the outer strands. Both the IWRC and the outer strands are preferably lubricated. A method is also disclosed for manufacturing such wire rope.
Abstract:
An elevator rope includes an inner layer rope having inner layer strands in which steel wires are twisted together for suspending a car of an elevator apparatus. An inner layer cladding made of a resin covers a periphery of the inner layer rope. A outer layer on a peripheral portion of the inner layer cladding has outer layer strands in which steel wires are twisted together. An outer layer cladding made of a high-friction resin material covers the periphery of the outer layer.
Abstract:
Electrical conductors according to the invention include conductors made from a plurality of strands twisted around a central conductor, where the strands are fused to the central conductor but not to each other. According to a preferred embodiment, the central conductor is coated with a coating of a first material which may be melted to fuse the central conductor to the outer strands. In another preferred embodiment, the outer strands are also coated with a second conductive material which forms a eutectic mixture with the coating on the central conductor when heated to a temperature below the melting points of the first and second conductive materials. Alternate embodiments of the invention provide a eutectic mixture by choice of strand and central conductor material and/or coating. If desired, the conductor is deformed prior to melting the coating(s) such as by drawing or swaging to form a conductor with a substantially circular cross section or by rolling or drawing to form a conductor with a substantially rectangular cross section. In still another embodiment, the conductor is formed as a coil prior to melting the coating(s). The conductors of the invention exhibit enhanced electrical and physical characteristics and are particularly well suited for use in conducting VHF and UHF signals and for making coils.
Abstract:
The wire rope of this invention has at most 18 outer strands and an independent wire rope core, with the strands of the core being laid in the opposite direction to the outer strands of the rope, and a nylon jacket is provided between the core and the outer strands of the wire rope.
Abstract:
Strands and wire ropes composed of materials such as high carbon steels and stainless steels can be provided in a compacted, mechanically stress relieved and thermally stress relieved condition. The wires are compacted during stranding to form the individual strands of the wire ropes. The wires can be thermally stress relieved prior to stranding to remove tensile residual stresses. Compaction produces a compressive residual stress state in the strands which increases fatigue resistance. The strands can be thermally stress relieved subsequent to closing. The wires and strands can be heated using a process such as induction heating. The wire ropes can be torque balanced or rotation resistant. The wire ropes have high strength, a high strength-to-weight ratio and enhanced fatigue life. Stainless steel wire ropes also provide corrosion resistance.
Abstract:
A method for using a bunching type twisting machine to manufacture a steel cord made up of one core filament having a continuous wavy form and five to eight sheath filaments not having a wavy form disposed around the core filament, the cross-sectional shape of the cord forming an ellipse whose orientation is substantially constant in the length direction of the cord. After a core filament is preformed with a helical wavy form of a smaller pitch than the cord twisting pitch, this is squashed to form a flat helical core filament at a stage before it is twisted together with sheath filaments, and then sheath filaments are twisted around this flat helical core filament to make an intermediate product cord and this intermediate product cord is then squashed and thereby flattened before being taken up on a reel.
Abstract:
A method for producing a compacted wire strand substantially triangular in shape for making wire rope includes the steps of (i) unwinding a central group of wires from a bobbin, the central group being substantially triangular, (ii) winding up a first layer of wires around the central group, each wire of the first layer being released from a first set of bobbins mounted on a first cage rotating about the central group, (iii) winding up a second layer of wires around the first layer of wires, each wire of the second layer being released from a second set of bobbins mounted on a second cage rotating around the central group, the first cage rotating at a speed 1.6 to 1.9 times faster than that of the second cage, (iv) compacting the strand made of the first and second layers of wires in a substantially triangular die by pulling the strand therethrough, and (v) rolling up the compacted substantially triangular strand on a drum.
Abstract:
The steel cord has the 1.times.9 structure, in which three core wires and six thicker outer wires are twisted in the same direction with the same pitch, and has a flat shape in the section which is taken perpendicularly to the longitudinal section thereof. The six outer wires having at least two gaps between adjacent ones and the core wires have at least one gap between adjacent ones.
Abstract:
A wire rope is constructed so that the twisting moment generated in the rope per unit load decreases from one end of the rope to the other . This is accomplished by varying the length of lay along the rope.