Abstract:
The present invention refers to a metal rope with improved features, in particular having high ultimate tensile strength and a high number of sustainable fatigue cycles. The metal rope (10) according to the present invention consists of a plurality of strands (12) wound around a central core (14) and is characterised in that the central core (14) is made of a fibre spun from a liquid-crystal polymer. Preferably, this fibre spun from a liquid-crystal polymer is Vectran ™ .
Abstract:
The invention concerns a composite cable comprising a plurality of strands (10, 12) stranded around a composite synthetic core (5) with a concentric structure: the core (5) consists of a nucleus (11) formed by a bundle of parallel synthetic fibres extending along the cable longitudinal direction, and of a compact thermoplastic sheath (13) enclosing said nucleus (11) and serving as winding support for the strands. The invention is particularly applicable to cables for lifting or for elevators.
Abstract:
A tubular outer member (1) of plastics material is extruded onto a solid cylindrical central member (3) of plastics material. The outer member (1) has symmetrically spaced grooves (2) for receiving respective wire strands (4).
Abstract:
Provided is a steel cord for reinforcing a rubber article which can further improve cut resistance when applied to a tire. Provided is a steel cord for reinforcing a rubber article including: one core strand 11 having a layered-twisted structure formed by twisting a plurality of steel filaments 1; and a plurality of sheath strands 12 having a layered-twisted structure formed by twisting a plurality of steel filaments 2, wherein the sheath strands are twisted around the core strand. A ratio S1/S of the sum S1 of cross-sectional areas of outermost layer sheath filaments constituting an outermost layer sheath of the core strand to the sum S of cross-sectional areas of all filaments constituting the core strand is from 0.69 to 0.74, and a ratio Ps/P of the sum Ps of strengths of the sheath strands to strength P of the cord as a whole is from 0.81 to 0.85.
Abstract:
A steel cord is configured so that, when the steel cord is used as a tensile cord for an elastic crawler, a center-core dislocation and the earl y breakage of the wi res of a core are prevented. A steel cord comprises: a core which comprises a single core strand, and a sheath which is formed by twisting together six sheath strands arranged around the core. The core strand has a layer-twisted structure comprising: a center-core portion which is formed by twisting three core wires together; and an external layer portion which is formed by twisting together eight to nine core wires arranged around the center-core portion. The sheath strands each have either a bundle twisted structure which is formed by twisting twelve to nineteen sheath wires or a multi-layer twisted structure which is formed by twisting twelve to nineteen sheath wires in layers. The diameter (dc) of the core wires is greater than the diameter (ds) of the sheath wi res. The average gap (Gc) between the core wi res of the external layer portion is 0.015 mm or greater, and the average gap (Gs) between the sheath strands is 0.1 mm or greater.
Abstract:
A process for producing an eye at one or both ends of a coverbraided rope, the process comprising the steps of: a) providing a spacer; b) situating the spacer proximal a splice braid zone of an eye of the sling formed of the core rope; c) forming with a braiding machine a braided sheath about the splice braid zone to about the location where the splice braid zone meets its eye and covering at least portions of the spacer with at least a portion of the braided sheath; d) withdrawing from converging braid strands the eye having had its splice braid already covered by the braided sheath; e) forming with the braiding machine a length of hollow braided sheath; f) severing the length of hollow braided sheath; g) attaching to the spacer a severed end of the hollow braided sheath formed of the same strands that form at least a portion of the braided sheath and subsequently pulling the spacer out from between the braided sheath and the core rope in a direction that draws the severed end of the braided sheath into the braided sheath and causes it to occupy a position that previously was occupied by the spacer.