Patent US5408560A successfully refreshed from Google Patents.
US5408560A
Expired / Lapsed
US
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Tensile member for communication cables
Assignee: Bekaert NV SA
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Filing: 1994-01-27
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Granted: 1995-04-18
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Expires: 2014-01-27
Abstract
Abstract A communication cable (10) comprises optical fibres (24) and/or metal conductors (20) for the transmission of information, and a tensile member, the tensile member comprising a steel strand and synthetic material. The steel strand has a modulus of elasticity of at least 140 000 N/mm 2 . The steel strand comprises a core wire (12) and one layer of layer wires (14) surrounding the core wire. A contact is provided between the layer wires and the core wire. The interstices between the layer wires and the core wire are filled with a first synthetic material (13) having a melting-point above 150° C. The steel strand is covered by a layer of a second synthetic material (16). The filling with the first synthetic material and the covering by a layer of a second synthetic material is such that watertightness is obtained in the longitudinal direction of the tensile member.
Inventors
- 👤 Geert Seynhaeve
- 👤 Gerard Vandewalle
- 👤 Johan Veys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:20
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/18; H01B7/22; H01B7/221; H01B7/223; D; D07; D07B; D07B1/00; D07B1/14; D07B1/147; D07B1/16; D07B1/162; D07B1/165; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4416; G02B6/4429; G02B6/4434; G02B6/44384; H01B11/00; H01B11/22; H01B3/00; H01B3/18; H01B3/30; H01B7/28; H01B7/282; H01B7/285
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
154 words
A communication cable comprising optical fibres and/or metal conductors for the transmission of information, and a tensile member, for preventing the optical fibres and/or metal conductors from being put under a tensile load, the tensile member comprising a steel strand and a first and second synthetic material, the first synthetic material having a melting point above 150° C., the steel strand having a modulus of elasticity of at least 140.000 N/mm 2 , the steel strand comprising a core wire and at least one layer of layer wires surrounding the core wire, any interstices between the layer wires and the core wire being filled with said first synthetic material, the steel strand being covered by a layer of said second synthetic material, the filling with the first synthetic material and the covering by a layer of a second synthetic material being such that watertightness is obtained in the longitudinal direction of the tensile member.
Claim 2
Dependent Claim
154 words
A communication cable comprising optical fibres and/or metal conductors for the transmission of information, and a tensile member, for preventing the optical fibres and/or metal conductors from being put under a tensile load, the tensile member comprising a steel strand and a first and second synthetic material, the first synthetic material having a melting point above 150° C., the steel strand having a modulus of elasticity of at least 140.000 N/mm 2 , the steel strand comprising a core wire and at least one layer of layer wires surrounding the core wire, any interstices between the layer wires and the core wire being filled with said first synthetic material, the steel strand being covered by a layer of said second synthetic material, the filling with the first synthetic material and the covering by a layer of a second synthetic material being such that watertightness is obtained in the longitudinal direction of the tensile member.
Claim 3
Dependent Claim
18 words
A cable according to claim 1 wherein the first synthetic material is equal to the second synthetic material.
Claim 4
Dependent Claim
17 words
A cable according to claim 2 wherein the first synthetic material is a polyamide or a polyester.
Claim 5
Dependent Claim
18 words
A cable according to claim 1 wherein the first synthetic material is different from the second synthetic material.
Claim 6
Dependent Claim
27 words
A cable according to claim 4 wherein the first synthetic material is a hot melt polymer and the second synthetic material is a polyamide or a polyester.
Claim 7
Dependent Claim
22 words
A cable according to claim 4 wherein the first synthetic material is a polyamide and the second synthetic material is a polyethylene.
Claim 8
Dependent Claim
21 words
A cable according to claim 1 wherein the first synthetic material has a melt viscosity ranging from 50 to 200 Pa.s.
Claim 9
Dependent Claim
25 words
A cable according to claim 1, wherein the tensile member further comprising a second layer of a third synthetic material which surrounds the tensile member.
Claim 10
Dependent Claim
14 words
A cable according to claim 8 wherein the third synthetic material is a polyethylene.
Claim 11
Dependent Claim
22 words
A cable according to claim 1 wherein at least one layer wire has a steel to steel contact with the core wire.
Claim 12
Dependent Claim
24 words
A cable according to claim 1 wherein the diameter of the core wire and of the layer wires ranges from 0.50 to 2.0 mm.
Claim 13
Dependent Claim
29 words
A cable according to claim 1 wherein only one layer of layer wires has been provided and the layer wires have an openness of at least three per cent.
Claim 14
Dependent Claim
17 words
A cable according to claim 1 wherein the steel strand has one layer of six layer wires.
Claim 15
Dependent Claim
21 words
A cable according to claim 13 wherein the ratio core wire diameter to layer wire diameter ranges from 1.02 to 1.30.
Claim 16
Dependent Claim
23 words
A cable according to claim 1 wherein the twist pitch of the steel strand is greater than twenty times the core wire diameter.
Claim 17
Dependent Claim
27 words
A cable according to claim 1 wherein at least some of the wires of the steel strand are covered with up to 2.5 g/m 2 of phosphate.
Claim 18
Dependent Claim
19 words
A cable according to claim 1 wherein the breaking load of the steel strand is at least 5000 N.
Claim 19
Dependent Claim
21 words
A cable according to claim 1 wherein the tensile strength of the steel strand is at least 1400 N/mm 2 .
Claim 20
Dependent Claim
21 words
A cable according to claim 1 wherein the tensile member has an elastic elongation which is smaller than 1.5 per cent.
Claim 21
Dependent Claim
23 words
A cable according to claim 1 wherein the tensile member has a total elongation at fracture which is smaller than 2.8 per cent.
Claim 22
Dependent Claim
15 words
A cable according to claim 1 wherein the tensile member is free of residual torsions.
Claim 23
Dependent Claim
128 words
A tensile member for communication cables, the tensile member comprising a single steel strand and a first and second synthetic material, the first synthetic material having a melting point above 150° C., the steel strand having a modulus of elasticity of at least 140.000 N/mm 2 , the steel strand comprising a core wire and at least one layer of layer wires surrounding the core wire, the interstices between the layer wires and the core wire being filled with said first synthetic material, the steel strand being covered by a layer of the second synthetic material, the filling with the first synthetic material and the covering by a layer of a second synthetic material being such that watertightness is obtained in the longitudinal direction of the tensile member.
Claim 24
Dependent Claim
128 words
A tensile member for communication cables, the tensile member comprising a single steel strand and a first and second synthetic material, the first synthetic material having a melting point above 150° C., the steel strand having a modulus of elasticity of at least 140.000 N/mm 2 , the steel strand comprising a core wire and at least one layer of layer wires surrounding the core wire, the interstices between the layer wires and the core wire being filled with said first synthetic material, the steel strand being covered by a layer of the second synthetic material, the filling with the first synthetic material and the covering by a layer of a second synthetic material being such that watertightness is obtained in the longitudinal direction of the tensile member.
Claim 25
Independent Claim
100 words
A method of making a tensile member for communication cables watertight in its longitudinal direction, said method comprising: providing a steel wire as core wire for the tensile member; providing one layer of layer wires around the core wire such that a steel strand with a modulus of elasticity of at least 140 000 N/mm 2 is obtained; filling any interstices between the core wire and the layer wires in the steel strand with a first synthetic material, said first synthetic material having a melting point above 150° C.; covering the thus filled steel strand with a second synthetic material.
Claim 26
Independent Claim
100 words
A method of making a tensile member for communication cables watertight in its longitudinal direction, said method comprising: providing a steel wire as core wire for the tensile member; providing one layer of layer wires around the core wire such that a steel strand with a modulus of elasticity of at least 140 000 N/mm 2 is obtained; filling any interstices between the core wire and the layer wires in the steel strand with a first synthetic material, said first synthetic material having a melting point above 150° C.; covering the thus filled steel strand with a second synthetic material.
Claim 27
Independent Claim
73 words
A method of manufacturing a tensile member for communication cables, said method comprising: providing a steel wire as a core wire for the tensile member; covering said core wire with a first synthetic material, said first synthetic material having a melting point above 150° C.; providing one layer of layer wires around the thus coated core wire in order to obtain a strand; covering the thus obtained strand with a second synthetic material.
Claim 28
Independent Claim
73 words
A method of manufacturing a tensile member for communication cables, said method comprising: providing a steel wire as a core wire for the tensile member; covering said core wire with a first synthetic material, said first synthetic material having a melting point above 150° C.; providing one layer of layer wires around the thus coated core wire in order to obtain a strand; covering the thus obtained strand with a second synthetic material.
Claim 29
Dependent Claim
31 words
A method according to claim 24 wherein the strand is preheated in order to soften said first synthetic material prior to the covering of the strand with the second synthetic material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |