Reinforcement cable formed solely or at least in part of an assembly of two-wire strands; articles containing such cables
AssigneeCompagnie Generale Des Etablissements Michelin
InventorsJean-Louis Charvet, Christian Garcia
Life of this patent
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Abstract
A reinforcement cable is formed of an assembly of strands. Each strand is formed of two wires wound around each other in the same direction, with a constant pitch whose length is less than 300 mm. The two wires have linear contact with each other in the form of a helix. These helices have the same direction and the same constant pitch length. The assembly is formed of two strands of the same length of pitch and wound in opposite directions and/or it is formed of two to four strands such that the assembly has the same length of pitch and wound in the same direction as one strand and, with respect to another strand, a different length of pitch and/or wound in an opposite direction.
Claims13
A reinforcement cable characterized by the fact that it is formed solely or at least in part by an assembly of strands, said assembly having the following characteristics when its axis is rectilinear:
- (a) each strand consists of two wires;
- (b) in each strand the two wires are wound around each other in the same direction, called the "direction of the strand," with a constant pitch, called the "pitch of the strand," the length of this pitch being less than 300 mm;
- (c) in each strand the two wires have substantially linear contact with each other, this line of contact describing substantially a helix, called the "contact helix," around the axis of the assembly;
- (d) all the contact helices have the same direction, called the "direction of the assembly," and the same constant length of pitch, called the "length of the pitch of the assembly";
- (e) the distance from the contact helices to the axis of the assembly, in a plane perpendicular to said axis, being substantially the same for all of these helices;
- (f) the strands are twisted together;
- (g) the assembly satisfies at least one of the following two conditions:
- (I) it consists of two strands, the lengths of the pitches of the strands being equal and the directions of the strands being opposite;
- (II) it is formed of at least two strands and at most four strands;
- the length of the pitch of the assembly is equal to the length of the pitch of at least one of the strands, the direction of the assembly being the same as that of said strand or strands;
- at least one other strand of the assembly has either a length of pitch different from the length of the pitch of the assembly or both a length of pitch equal to the length of the pitch of the assembly and a direction opposite to the direction of the assembly.
Dependencies are inferred from the claim text.