Abstract:
A pneumatic tire has at least the outermost one of a plurality of rubber layers between a carcass and tread reinforced with a plurality of steel cords. Each of these steel cords is a single-strand steel cord with an elongation at break of not less than 4% and at least one of its component wires does not form a common circumcircle with the remaining wires. The curve circumscribing cross sections of the constituent wires of each steel cord is not a true circle. High resistance to nail penetration is assured by arranging the steel cords in such a manner that, for a large majority of steel cords, the direction of maximum offset span of the circumscribing curve is substantially coincidental with the width direction of thec outermost layer of rubber.
Abstract:
A pneumatic tire comprises a tread reinforcing belt made of metallic cords, each of the metallic cords is made up of six to twelve metallic filaments whose diameter is not less than 0.15 mm but less than 0.25 mm, the six to twelve metallic filaments are grouped into a plurality of bunches each including two to four filaments, the filaments of each bunch are twisted together at a first twisting pitch, the bunches are twisted together into the cord at a final twist pitch Pc of from 10 to 40 mm, the first twisting pitch is more than the final twist pitch, and the bunches each include at least one waved filament which is two-dimensionally waved at wave pitches Pw in a range of from 5 to 30 times the diameter (d) of the filament and a wave height (h) in a range of from 0.2 to 3.0 times the diameter (d).
Abstract:
In the pneumatic tire of this invention, at least the outermost one of a plurality of rubber layers between the carcass and tread has been reinforced with a plurality of steel cords. Each of these steel cords is a single-strand steel cord with an elongation at break of not less than 4% and at least one of its component wires does not form a common circumcircle with the remaining wires. This pneumatic tire features a high anti-cut property, high wire tenacity utilization rate, high rigidity and inhibited onset and growth of separation. The curve circumscribing the cross-sections of the constituent wires of each steel cord is not a true circle. Furthermore, a high resistance to nail penetration is assured by arranging the steel cords in such a manner that, for a large majority of steel cords, the direction of maximum offset span of the circumscribing curve is substantially coincidental with the width direction of the outermost layer of rubber.
Abstract:
A steel cord (10) for reinforcing elastomeric articles. The steel cord (10) having a plurality of strands (14). Each strand (14) having a core (20) and a sheath (22). The sheath (22) being a plurality of steel filaments that are helically wrapped about the core (20). A first strand (16) extending longitudinally through the center of the steel cord (10). The remaining strands (18) being helically wrapped about the first strand (16). The core (20) of the first strand (16) being a plurality of filaments twisted together. In a preferred embodiment, the core (20) of the first strand 16 being three filaments twisted together.
Abstract:
A two-layered twisted steel cord for reinforcing rubber articles, comprising a core including two filaments and a sheath including six or seven filaments wound around the core, in which an average twist pitch of the core is set to be at least 30 mm, and when six filaments are used for the sheath, a ratio of diameter ds of each filament of the sheath to diameter dc of each filament of the core, �(ds/dc).times.100!, is set in a range of 58.0 %
Abstract:
A cord is provided, including: a core material and an outer layer. The core material includes a plurality of first strands braided with one another, and the outer layer is disposed around the core material and includes a plurality of second strands knitted with one another.
Abstract:
A steel strand (10) comprises a steel core wire (12). This steel core wire (12) is surrounded by steel layer wires (14) that are twisted around the steel core wire (12). The steel core wire (12) is covered with a thick corrosion resistant core coating (16) provided by strip cladding or by metal extrusion. The steel layer wires (14) are covered with a thin corrosion resistant layer coating (18) provided by a hot dip operation or by an electroplating or chemical plating process. The steel strand (10) is compacted so that said steel layer wires (14) have a non-circular cross-section and that the thick corrosion resistant core coating fills the interstices between the steel core wire (12) and the steel layer wires (14) in order to give the steel strand (10) an improved corrosion resistance and increased lifetime.
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 hybrid rope (40) or a hybrid strand (50) comprising a core element (42, 52), a first (44, 54) and a second (46, 56) metallic closed layer surrounding said core element (42, 52). The core element (42, 52) includes a bundle of synthetic yarns. The first metallic closed layer (44, 54) includes a plurality of first strands of wires helically twisted together with the core element (42, 52) in a first direction. The second metallic closed layer (46, 56) includes a plurality of second wires or strands helically twisted together with said core element (42, 52) and said first metallic closed layer (44, 54) in a second direction. The cross-sectional area of the core element (42, 52) is larger than the total cross-sectional area of the first (44, 54) and second (46, 56) metallic closed layers. A corresponding method of producing such a hybrid rope or hybrid strand is also disclosed.
Abstract:
The present invention relates to a rope for an elevator. The rope for the elevator comprises: a center strand formed by twisting a plurality of wires; inner layer strands formed by twisting the plurality of wires and arranged along the outer periphery of the center strand; and outer layer strands formed by twisting the plurality of wires and arranged along the outer periphery of the inner layer strands, wherein ten of each of the inner layer strands and the outer layer strands are prepared, the diameter of the center strand, the diameter of the inner layer strand and the diameter of the outer layer strand are respectively 0.33-0.35 times, 0.13-0.15 times and 0.22-0.24 times as large as the diameter of a first imaginary circle circumscribed around the outer layer strands, and a fill factor is 64-67%.