US 2022/0412000 A1 · TWO-LAYER MULTI-STRAND CABLE HAVING AN IMPROVED SURFACE ENERGY-TO-BREAK

Abstract

A multi-strand cord (50) comprises an internal layer (CI) made up of K=1 internal strand (TI) having two layers (C1, C3), with the internal layer (C1) being made up of Q internal metallic threads (F1) and the external layer (C3) being made up of N external metallic threads (F3), and an external layer (CE) made up of L>1 external strands (TE) having two layers (C1′, C3′) wound around the internal layer (CI), with the internal layer (C1′) being made up of Q′ internal metallic threads (F1′) and the external layer (C3′) being made up of N′ external metallic threads (F3′). The cord (50) has an energy-to-break per unit area ES≥145 N·mm−1 with ES=Σi=1NcFmi×Σi=1NcAti/Nc×Cfrag/D where Σi=1NcFmi is the sum of the forces at break, Σi=1NcAti is the sum of the total elongation, Cfrag is the coefficient of weakening, and D is the diameter.

Claims17

Dependent claims

-15. (canceled)

A cord (50′) extracted from a polymer matrix, the extracted cord (50′) comprising:

an internal layer (CI) of the cord made up of K=1 internal strand (TI) having two layers (C1, C3) comprising:
an internal layer (C1) made up of Q=2, 3 or 4 internal metallic threads (F1), and
an external layer (C3) made up of N external metallic threads (F3) of diameter d3 wound around the internal layer (C1);
and
an external layer (CE) of the cord made up of L>1 external strands (TE) having two layers (C1′, C3′) wound around the internal layer (CI) of the cord, comprising:
an internal layer (C1′) made up of Q′=2, 3 or 4 internal metallic threads (F1′), and
an external layer (C3′) made up of N′ external metallic threads (F3′) of diameter d3′ wound around the internal layer (C1′),
wherein the extracted cord (50′) has an energy-to-break ES′≥150 N·mm−1 with ES′=Σi=1NcFmi×Σi=1NcAti/Nc×Cfrag′/D where:
Σi=1NcFmi is a sum of forces at break for the Nc threads, in Newtons,
Nc=Q+N+L×(Q′+N′) is the total number of metallic threads,
D is the diameter of the cord, in mm,
Σi=1NcAti is a sum of total elongation of the Nc threads and is dimensionless, and
Cfrag′ is the dimensionless coefficient of weakening of the cord (50′), with
C
frag
′
=
1
-
(
2
-
C
⁢
p
)
×
(
sin
⁡
(
∝
f
)
d
⁢
3
×
d
⁢
3
′
×
(
∑
i
=
1
Q
′
+
N
′
F
m
⁢
i
)
×
sin
⁡
(
α
⁢
t
)
N
×
C
⁢
s
⁢
t
⁢
e
)
where:
Cp is the penetration coefficient for the cord,
d3 and d3′ are expressed in mm,
αf is an angle of contact between the external metallic threads (F3) of the internal strand (TI) and the external metallic threads (F3′) of the external strands (TE), expressed in radians,
αt is a helix angle of the external strands (TE), expressed in radians, and
Cste=1500 N·mm−2.

79 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/778,687Filed 5 Nov 2020

Priority

FR FR191307822 Nov 2019

Published

29 Dec 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification18 codes

D07B 1/0613
Reinforcing cords for rubber or plastic articles: the reinforcing cords being characterised by the rope configuration
D07B 1/0633
The reinforcing cords being characterised by the strand configuration: having a multiple-layer configuration
D07B 1/066
Reinforcing cords for rubber or plastic articles: the wires being made from special alloy or special steel composition
D07B 1/0626
The reinforcing cords being characterised by the strand configuration: the reinforcing cords consisting of three core wires or filaments and at…

Two-layer multi-strand cable having an improved surface energy-to-break

Life of this patent

Two-layer multi-strand cable having an improved surface energy-to-break

Life of this patent

Abstract

Claims17