US3271508A - Communication cable - Google Patents

Communication cable Download PDF

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Publication number
US3271508A
US3271508A US452225A US45222565A US3271508A US 3271508 A US3271508 A US 3271508A US 452225 A US452225 A US 452225A US 45222565 A US45222565 A US 45222565A US 3271508 A US3271508 A US 3271508A
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lay
pairs
length
cable
conductors
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US452225A
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Burr Harvey
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Ericsson Inc
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Anaconda Wire and Cable Co
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Assigned to ANACONDA-ERICSSON INC., A CORP. OF reassignment ANACONDA-ERICSSON INC., A CORP. OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ANACONDA COMPANY, THE A CORP. OF DE
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors

Definitions

  • HARVEY BURR United States Patent 3,271,508 COMMUNICATION CABLE Harvey Burr, De Kalb, Ill., assignor to Anaconda Wire and Cable Company, a corporation of Delaware Filed Apr. 30, 1965, Ser. No. 452,225 4 Claims. (Cl. 174-113)
  • My invention relates to communication cables and particularly to cables having a large plurality of twisted pars insulated with longitudinal tapes.
  • I have invented a communication cable which comprises a large pluralityof twisted pairs of insulated conductors with all of the pairs twisted with the same direction of lay.
  • Each conductor of my cable is individually wrapped with approximately a double layer of spiralled insulating tape, such as paper, having a wrapping lay the same as the length of lay of twist of the pair that includes the conductor.
  • the direction of spiral of the paper on all the conductors of the cable is the same.
  • the pairs themselves are cabled together with a length of lay exceeding the length of lay of any of the component pairs twists, and there is a sheath surrounding the cabled conductors.
  • My cable may have a first plurality of conductor pairs cabled into a first core unit and at least a second plurality of pairs cabled into a second unit with the core units themselves helically twisted to form the cable core.
  • FIGURE 1 shows a lengthwise section of a cable made to my invention.
  • FIGURE 2 shows an enlarged section of an insulated conductor used in my invention.
  • FIGURE 3 shows an enlarged section taken through the conductor at 33 having insulation spiralled in a direction opposite to that of the conductor of FIGURE 2.
  • FIGURE 4 shows a cable core made in accordance with my invention.
  • My cable indicated generally by the numeral comprises a large plurality, by which I means at least 25, of pairs 11, each pair being made by twisting together 2 insulated conductors 12, 13.
  • the insulation on each of the conductors consists of a spiralled paper that is applied with a seam 16 running lengthwise.
  • the paper is not helically wrapped around the conductors in the manner customary in the communication cable art but has a uniform spiral with a longitudinal edge, most clearly shown in FIGURE 3.
  • the edges 16 do have a helical twist around the conductors "ice but this was imparted during the twisting of the pairs and the length of lay of this spiral is the same as the length of lay l of the pair twist.
  • the pairs 11 are all twisted with a left hand lay.
  • My cable is equally satisfactory if all the pairs are twisted with a right hand lay, but it is a feature of my cable, showing unexpected advantages, that the direction of lay of all the pairs are the same, either left-hand or right-hand.
  • the pairs 11 have been cabled together with a right hand spiral in a long lay.
  • I have designated the length l as marking the length of lay of one of my pairs 11 but it will be understood that the length of lay of adjacent pairs will always be varied in the usual known manner for the purpose of avoiding cross talk.
  • the length of lay may be uniform for any pair or it may also vary along the length of the pair, but the length of lay of the cable core formed by the twisted pairs themselves, exceeds the maximum lay of pairing of any of the pairs at any point.
  • FIGURE 4 a plurality of the pairs 11 have been stranded to form a core unit 21, a second plurality of pairs have been stranded into the unit 22, and a third plurality has been stranded into a unit 23.
  • the three units have then been cabled into a cable core 24 and covered by a metal sheath 26.
  • the core 24 is characterized by having the same direction of lay on all the pair twists and the same direction of spiral of all the insulation wraps.
  • the advantage appears to be associated with the manner in which the pairs oan slide relative to each other when the cable is flexed sharply or stretched.
  • the advantage shows up particularly when .the cable sheath has been dented or necked down. In a conventional helically insulated cable the insul-ations tend to bunch up at the constricted area and to create bare spots all at one point where they oan short against each other.
  • the bunched up paper in the constricted zone tends to jam the conductors so that, instead of stretching harmlessly over a long length where it may not exceed the elastic limit, whatever elongation of the conductors may take place due to flexing or stretching of the cable sheath is confined to a short distance where it may be enough to break the conductors or to increase their electrical resistance beyond acceptable limits.
  • a communication cable comprising a large plurality of twisted pairs of insulated conductors
  • each conductor being individually wrapped with an approximately double layer of spiralled insulating tape having a length of wrapping lay equal to the length of lay of twist of the pair comprising said conductor
  • a communication cable comprising a large plurality of twisted pairs of insulated conductors
  • each conductor being individually wrapped with an approximately double layer of spiralled insulating paper having a length of wrapping lay equal to the length of lay of twist of the pair comprising said conductor,
  • a communication cable comprising a large number of twisted pairs of insulated conductors
  • each conduct-or being individually wrapped with an approximately double layer of spiralled insulating tape having a length of wrapping lay equal to the length of lay of twist of the pair comprising said conductor
  • a communication cable comprising a large number of twisted pairs of insulated conductors
  • each conductor being individual-1y wrapped with an approximately double layer of spiralled insulating paper having a length of wrapping lay equal to the length of lay of twist of the pair comprising said conductor,

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  • Communication Cables (AREA)

Description

Sept. 6, 1966 H. BURR COMMUNICATION CABLE Filed April 30, 1965 INVENTOR.
HARVEY BURR United States Patent 3,271,508 COMMUNICATION CABLE Harvey Burr, De Kalb, Ill., assignor to Anaconda Wire and Cable Company, a corporation of Delaware Filed Apr. 30, 1965, Ser. No. 452,225 4 Claims. (Cl. 174-113) My invention relates to communication cables and particularly to cables having a large plurality of twisted pars insulated with longitudinal tapes.
In my US. Patent 3,053,037 there is described an apparatus for applying paper tapes to telephone conductors straight-away while, at the same time, twinning the conductors to form twisted pairs. The product produced by this apparatus will have the paper insulation wrapped, in effect, with the same length of lay as the law of twist of the pair. In my applications, Serial Nos. 383,335 and 409,898, I have disclosed dies suitable for applying paper or other tapes around metal wires, straight-away with a longitudinal scam.
I have now discovered that when the pairs made with 'my longitudinal tape insulation are formed into cables of large size in the manner, and so as to form a cable structure, hereinafter to be described, the cable has unexpected properties and advantages.
It is an object of my invention to make a telephone cable with a large plurality of conductor pairs, at low cost.
It is a further object of my invention to make a telephone cable having a large plurality of conductor pairs of more than usual reliability.
It is a further object of my invention to make a large diameter telephone cable resistant to mechanical abuse.
I have invented a communication cable which comprises a large pluralityof twisted pairs of insulated conductors with all of the pairs twisted with the same direction of lay. Each conductor of my cable is individually wrapped with approximately a double layer of spiralled insulating tape, such as paper, having a wrapping lay the same as the length of lay of twist of the pair that includes the conductor. The direction of spiral of the paper on all the conductors of the cable is the same. The pairs themselves are cabled together with a length of lay exceeding the length of lay of any of the component pairs twists, and there is a sheath surrounding the cabled conductors.
My cable may have a first plurality of conductor pairs cabled into a first core unit and at least a second plurality of pairs cabled into a second unit with the core units themselves helically twisted to form the cable core.
A more thorough understanding of my invention may .be gleaned from a study of the appended drawing.
In the drawing:
FIGURE 1 shows a lengthwise section of a cable made to my invention.
FIGURE 2 shows an enlarged section of an insulated conductor used in my invention.
FIGURE 3 shows an enlarged section taken through the conductor at 33 having insulation spiralled in a direction opposite to that of the conductor of FIGURE 2.
FIGURE 4 shows a cable core made in accordance with my invention.
My cable indicated generally by the numeral comprises a large plurality, by which I means at least 25, of pairs 11, each pair being made by twisting together 2 insulated conductors 12, 13. The insulation on each of the conductors consists of a spiralled paper that is applied with a seam 16 running lengthwise. In other words the paper is not helically wrapped around the conductors in the manner customary in the communication cable art but has a uniform spiral with a longitudinal edge, most clearly shown in FIGURE 3. In the twisted pairs 11 the edges 16 do have a helical twist around the conductors "ice but this was imparted during the twisting of the pairs and the length of lay of this spiral is the same as the length of lay l of the pair twist. By contrast, in the conventional wrapping of telephone paper insulation there are ten or more wraps of paper for each lay length of the pair. As shown in FIGURE 3 the spiral of the paper wrap is seen to be lockwise while the spiral of FIGURE 2 is counterclockwise. It is a feature of my cable 10 that all the conductors are insulated with a clockwise Wrap. They might equally effectively all be insulated with a counterclockwise (FIGURE 2) wrap, but it should be noted that the cables that were tested and found to have unexpected advantages, as hereinafter to be described, had all the conductors wrapped in the same direction.
As illustrated in FIGURE 1 the pairs 11 are all twisted with a left hand lay. My cable is equally satisfactory if all the pairs are twisted with a right hand lay, but it is a feature of my cable, showing unexpected advantages, that the direction of lay of all the pairs are the same, either left-hand or right-hand.
To form a cable core the pairs 11 have been cabled together with a right hand spiral in a long lay. I have designated the length l as marking the length of lay of one of my pairs 11 but it will be understood that the length of lay of adjacent pairs will always be varied in the usual known manner for the purpose of avoiding cross talk. The length of lay may be uniform for any pair or it may also vary along the length of the pair, but the length of lay of the cable core formed by the twisted pairs themselves, exceeds the maximum lay of pairing of any of the pairs at any point.
In FIGURE 4 a plurality of the pairs 11 have been stranded to form a core unit 21, a second plurality of pairs have been stranded into the unit 22, and a third plurality has been stranded into a unit 23. The three units have then been cabled into a cable core 24 and covered by a metal sheath 26. The core 24 is characterized by having the same direction of lay on all the pair twists and the same direction of spiral of all the insulation wraps.
Cables made in accordance with my invention having a large plurality of pairs, by which I mean at least 25 pairs, have been found to have an entirely unexpected advantage in ruggedness over convention-a1 helically wrapped or even pulp-insulated cables. The advantage appears to be associated with the manner in which the pairs oan slide relative to each other when the cable is flexed sharply or stretched. The advantage shows up particularly when .the cable sheath has been dented or necked down. In a conventional helically insulated cable the insul-ations tend to bunch up at the constricted area and to create bare spots all at one point where they oan short against each other. Furthermore, the bunched up paper in the constricted zone tends to jam the conductors so that, instead of stretching harmlessly over a long length where it may not exceed the elastic limit, whatever elongation of the conductors may take place due to flexing or stretching of the cable sheath is confined to a short distance where it may be enough to break the conductors or to increase their electrical resistance beyond acceptable limits.
When the new cable is destructively tested in a tensile machine it is found that the insulation breaks are distributed throughout the length of the test sample, Whereas the breaks in a helical-wrap-insulated cable or, for that matter, a pulp-insulated cable, are concentrated Within a short length of the sample. During tensile testing my new cable, having a large plurality of pairs, absorbed more than ten times .the energy absorbed by a helicalwrap-insulated cab-1e before the conductors started to break. This enables my new cab-1e -to better withstand a jerk during installation and, if the jerk is sufficient'ly violent to cause paper breaks, to have less chance of developing a cross or short.
I have invented a new and useful cable for which I desire an award of Letters Patent.
1 claim:
1. A communication cable comprising a large plurality of twisted pairs of insulated conductors,
I (A) all of said pairs or" conductors being twisted with the same direction of lay,
(B) each conductor being individually wrapped with an approximately double layer of spiralled insulating tape having a length of wrapping lay equal to the length of lay of twist of the pair comprising said conductor,
(C) the direction of spiral of the tape on all conductors in said cable being the same,
(D) said pairs being cabled together in a helix having a length of lay exceeding the length of lay of any of the component pair twists, and
(E) a sheath surrounding said cabled conductors.
2. A communication cable comprising a large plurality of twisted pairs of insulated conductors,
(A) all of said pairs of conductors being twisted with the same direction of lay,
(B) each conductor being individually wrapped with an approximately double layer of spiralled insulating paper having a length of wrapping lay equal to the length of lay of twist of the pair comprising said conductor,
(C) the direction of spiral of the paper on all conductors in said cable being the same,
(D) said pairs being cabled together in a helix having a length of lay exceeding the length of lay of any of the component pair twists, and
(:E) a sheath surrounding said cabled conductors.
*3. A communication cable comprising a large number of twisted pairs of insulated conductors,
(A) all of said pairs of conductors being twisted with the same direction of lay,
(B) each conduct-or being individually wrapped with an approximately double layer of spiralled insulating tape having a length of wrapping lay equal to the length of lay of twist of the pair comprising said conductor,
(C) the direction of spiral of the tape on all conductors in said cable being the same,
(D) a first plurality of said pairs being cabled together in a helix having a length of lay exceeding the length of lay of any of the component pair twists to form a first core unit,
(E) at least a second plurality of said pair-s being cabled together in a helix having a length of lay exceeding the length of lay of any of the component pair twists .to form a second core unit,
(F) said core units being helica'lly twisted together to form a cable core, and
(G) a sheath surrounding said core.
4. A communication cable comprising a large number of twisted pairs of insulated conductors,
(A) all of said pairs of conductors being twisted with the same direction of lay,
(B) each conductor being individual-1y wrapped with an approximately double layer of spiralled insulating paper having a length of wrapping lay equal to the length of lay of twist of the pair comprising said conductor,
(C) a first plurality of said pairs being cabled together in a helix having a length of lay exceeding the length of lay of any of the component pair twists to form a first core unit,
(D) the direction of spiral of the paper on all conductors in said cable being the same,
(E) at least a second plurality of said pairs being cabled together in a helix having a length of lay exceeding the length of lay of any of the component pair twists to form a second core unit,
(F) said core units being helically twisted together to form a cable core, and
(G) a sheath surrounding said core.
No references cited.
LEWIS H. MYERS, Primary Examiner.

Claims (1)

1. A COMMUNICATION CABLE COMPRISING A LARGE PLURALITY OF TWISTED PAIRS OF INSULATED CONDUCTORS, (A) ALL OF SAID PAIRS OF CONDUCTORS BEING TWISTED WITH THE SAME DIRECTION OF LAY, (B) EACH CONDUCTOR BEING INDIVIDUALLY WRAPPED WITH AN APPROXIMATELY DOUBLE LAYER OF SPIRALLED INSULATING TAPE HAVING A LENGTH OF WRAPPING LAY EQUAL TO THE LENGTH OF LAY OF TWIST OF THE PAIR COMPRISING SAID CONDUCTOR, (C) THE DIRECTION OF SPIRAL OF THE TAPE ON ALL CONDUCTORS IN SAID CABLE BEING THE SAME, (D) SAID PAIRS BEING CABLE TOGETHER IN A HELIX HAVING A LENGTH OF LAY EXCEEDING THE LENGTH OF LAY OF ANY OF THE COMPONENT PAIR TWISTS, AND (E) A SHEATH SURROUNDING SAID CABLED CONDUCTORS.
US452225A 1965-04-30 1965-04-30 Communication cable Expired - Lifetime US3271508A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3409734A (en) * 1967-06-12 1968-11-05 Anaconda Wire & Cable Co Telephone conductors with longitudinally wrapped and bonded paper tape insulation
US3621119A (en) * 1967-10-04 1971-11-16 Hitachi Cable Insulated conductor for communication cable
US3694565A (en) * 1972-02-08 1972-09-26 Int Standard Electric Corp B-type insulation
US3706838A (en) * 1969-11-19 1972-12-19 British Insulated Callenders Telecommunication cables
US3894172A (en) * 1973-11-06 1975-07-08 Gen Cable Corp Multicable telephone cable in a common sheath
US4873393A (en) * 1988-03-21 1989-10-10 American Telephone And Telegraph Company, At&T Bell Laboratories Local area network cabling arrangement
US5424491A (en) * 1993-10-08 1995-06-13 Northern Telecom Limited Telecommunications cable
US20120040539A1 (en) * 2010-06-24 2012-02-16 Ryan Enge Datacommunications Modules, Cable-Connector Assemblies and Components Therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3409734A (en) * 1967-06-12 1968-11-05 Anaconda Wire & Cable Co Telephone conductors with longitudinally wrapped and bonded paper tape insulation
US3621119A (en) * 1967-10-04 1971-11-16 Hitachi Cable Insulated conductor for communication cable
US3706838A (en) * 1969-11-19 1972-12-19 British Insulated Callenders Telecommunication cables
US3694565A (en) * 1972-02-08 1972-09-26 Int Standard Electric Corp B-type insulation
US3894172A (en) * 1973-11-06 1975-07-08 Gen Cable Corp Multicable telephone cable in a common sheath
US4873393A (en) * 1988-03-21 1989-10-10 American Telephone And Telegraph Company, At&T Bell Laboratories Local area network cabling arrangement
US5424491A (en) * 1993-10-08 1995-06-13 Northern Telecom Limited Telecommunications cable
US20120040539A1 (en) * 2010-06-24 2012-02-16 Ryan Enge Datacommunications Modules, Cable-Connector Assemblies and Components Therefor
US8882514B2 (en) * 2010-06-24 2014-11-11 Commscope, Inc. Of North Carolina Datacommunications modules, cable-connector assemblies and components therefor

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Effective date: 19800728