US3564116A - Splice for laminated tapes - Google Patents

Splice for laminated tapes Download PDF

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Publication number
US3564116A
US3564116A US822370A US3564116DA US3564116A US 3564116 A US3564116 A US 3564116A US 822370 A US822370 A US 822370A US 3564116D A US3564116D A US 3564116DA US 3564116 A US3564116 A US 3564116A
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US
United States
Prior art keywords
tapes
strips
metal
connector element
tangs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US822370A
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English (en)
Inventor
Joseph B Masterson
John D Lawler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Cable Corp
Original Assignee
General Cable Corp
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Filing date
Publication date
Application filed by General Cable Corp filed Critical General Cable Corp
Application granted granted Critical
Publication of US3564116A publication Critical patent/US3564116A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/022—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of longitudinal lapped tape-conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
    • H01R4/2404—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies

Definitions

  • This invention relates to the providing of an electrical connection between two composite electrical tapes used as a shield, or a moisture barrier in electrical cables.
  • the problem of providing electrical connection to the tape without damaging 'other properties of the tape, is significant.
  • Conventional means for removing the insulation from the metal of the tape, spot-welding the metal, and then recoating the denuded area with an insulation is time consuming and can not completely restore the integrity of the tape. Inthe cases where thin metal such as foil is employed in the tape fabrication, the removal of insulation is virtually impossible for production methods.
  • This invention connects the overlapping ends of shielding tapes together by placing between their overlapping ends a strip connector of a metal having good electrical conductivity and having tangs punched substantially perpendicular to each face of the metal strip.
  • the tang length is regulated by the diameter of the punched hole and'the metal thickness. It can, therefore, be designed to penetratethrough various depths of insulation to make contact with the metal of the insulated shielding tapes but not necessarily piercing or breaking the metal.
  • the overlapping ends of the shielding tapes, with the strip connector between them, are held together under heat and pressure which causes the plastic coatings on the tapes to melt andflow around the connector strip, completely encapsulating the connector in the splice overlap and making a hermetically sealed electrical and mechanical connection between the tapes.
  • the connector strip itself can be punched from either polyethylene-coated metal or bare metal. In cases where the shielding tapes have a minimum thickness of plastic coating, it is preferable to use a connector strip made from coated metal so as to insure a hermetic seal.
  • Connectors of this invention inserted in overlapped tape splices have shown a contact resistance of approximately l-, ohms.
  • the connector strips of this invention when used with an 8 milaluminum tape having a 2 mil coating, will withstand high-current application which causes the aluminum tape itself to fuse with no change in the contact resistance of the splice.
  • Heat-sealed overlapped splices with the connectors of this invention when subjected to tensile strength, do not fail at the splice area.
  • the tape itself fractures at an area remote from the splice.
  • FIG. 1 is a diagrammatic view of an. electrical cable having shielding tapes spliced together withla connector element made in accordance with this invention
  • FIG. 2 is an enlarged diagrammatic sectional view taken on the line 2-2 of FIG. 1;
  • FIG. 1 shows a cable having a shielding tape 12 along oneportion of the cable, spliced to'another shielding tape 14 which extends along another portion of the cable.
  • a shielding tape 12 along oneportion of the cable
  • spliced to'another shielding tape 14 which extends along another portion of the cable.
  • the end of the tape 12 is indicated by the reference character 22 and the end of thetape 14 is indicated by the reference character 24.
  • a strip or tape connector hereinafter referred to as a connector element 30.
  • the connector element 30 eittends circumferentially around the outside of the tape 12 and under the overlapping portion of the tape 14.
  • the thicknesses of parts are greatly exaggerated in the drawing and in actual practice the thickness of the shielding tapes 12 and 14, including the plastic coating on the tapes, is between 6 and 16 mils.
  • the connector element 30 is made from sheet metal having a thickness somewhat greater than the thickness of the metal foil of the shielding tapes l2 and 14 in order to obtain tangs of sufficient strength for its intended purpose. In the preferred construction the connector element 30 is made from material having a thickness between 1 and 10 mils.
  • FIG. 4 shows the way in which'the connector element 30 is formed with openings 32 and 34 having metal displaced from the openings bent substantially perpendicular to the rest of the connector element 30 to form tangs 36.
  • Some of the tangs 36 extend upwardly from the body of the connector element 30, as shown around the opening 32; and others of the tangs 36 are bent downwardly, as shown around the opening 34.
  • each of the tapes 36 is substantially equal to the radius of the: opening from which the tangs are displaced.
  • FIG. 5 shows a connector element 304 with an opening 32b having upwardly extending tangs 36a and shows another opening 34a with downwardly extendingtangs 36b.
  • the tangs 360 are long enough to penetrate the coating on the shielding tape which will contact with the upper end of the connector element 30a of FIG. 5 and the tangs 36b are long enough to penetrate a coating which will contact with the lower side of the connector element 30a.
  • FIG. 3 shows the connector element 30 assembled with the shielding tapes l2 and 14.
  • the shielding tape 14 is shown with a thin outer coating of plastic 41, a metal foil strip 42, preferably aluminum, and a lower plastic coating 43 of greater thickness than the outer coating 41.
  • the shielding tape 12 has a thin inner coating 47, a metal foil strip 48 and a thicker inner coating 49.
  • Both of the coatings 43 and 47 which confront the connector 30 are of different thickness and, therefore, the connector 30 has the tangs 36 and 36, which project from its opposite surfaces, of difierent lengths as shown in FIG. 4. 1
  • the connector element is shown 7 with angularly spaced rows 54 of openings 32 and 34. Rows of openings 32, with upwardly extending tangs 36, alternate with rows of openings 34 having downwardly extending tangs 36'.
  • FIG. 3 the left-hand opening 32 is shown with the tangs 36 piercing the plastic coating 43 to contact with the bare metal of the foil 42.
  • the drawing shows the tangs 36 indenting the foil 42 and displacing some of the foil at the indents as indicated by the humps '56 on the side of the foil opposite the tangs. This prevents relative movement of the shielding tape 14 axially with respect to the connector element 30 and also with respect to the other shielding tape 12 which is similarly locked to the connector element 30 by tangs which extend downwardly from the opening 34.
  • This left-hand opening 32 in FIG. 3 has the plastic 43 'of the tape 14 substantially filling the space between the tangs, and this is the condition that exists after the tangs have pierced through the plastic.
  • the plastic that is actually between the tangs 36 of the right-hand opening 32 and the tangs 36' of the opening 34 is broken away to expose the tangs on the far sides of these openings; and to show the way in which those tangs also dent the metal foils 42 and 48, respectively, to increase the area of contact for the electrical connection and to anchor the connector element 30 to the tapes 12 and 14, and thereby splice the tape together.
  • the degree to which the tangs 36 indent the metal foils 42 and 48 is a matter of choice. It depends largely upon the length of the tangs 36 with respect to the thickness of the coatings 43 and 47, and to some extent upon the pressure with which the outer tape 12 is pressed against the connector element 30, and the resulting pressure of the connector element 30 against the tape 14.
  • the tangs must touch the metal foils 42 and 48.
  • the tangs should dent the foils 42 and 48 for a depth at least equal to approximately the thickness of the foil.
  • the foil thickness is about .7 mils. It is desirable to have it within the range of from 0.5 and 8.0 mils.
  • the tangs 36 can be made to pierce openings through the foils 42 and 48, but this is not necessary, and it requires longer tangs and larger holes from which the tangs are displaced.
  • the projections provided by the tangs 36 can be formed in other ways than by displacing them from the body portion of the connector element around theedges of holes punched through the connector element.
  • the coatings 41, 43, 47 and 49 each have a thickness of about 2-9 mils.
  • the plastic coatings are a copolymer of polyethylene with reactive carboxyl groups for providing strong adhesion for the corrosion-preventing coating, and when the coatings are thin, they are homogenous throughout their thickness.
  • the plastic coating on the aluminum foil is thicker than about 4 mils, it is more economical to use the copolymer for a thickness of from 2-4 mils adjacent to the foil and to have the remaining thickness of the plastic coating a polyethylene homopolymer.
  • the connector element 30 need not be made from coated metal when it is to be used with shielding tapes 12 and 14 that have coatings of substantial thickness which can fuse to cover and protect the surfaces of the connector element.
  • the tapes have minimum coating of from 2-4 mils, however, then it is desirable that the connector 30 be made of metal which is itself coated with plastic to protect it from corrosion.
  • the coating is preferably applied before the tangs are struck from the body portion of the connector element so that the points of the tang are uncoated.
  • FIG. 6 is on a substantially enlarged scale so that the coating can be illustrated.
  • a metal body portion 60 of the connector element 30 is sandwiched between plastic coatings 61 and 62 which may be of the same material asused to coat the shielding tapes 12 and 14, or some other plastic-that will bond to the coatings of the shielding tapes.
  • a splice construction for providing electrical conductivimetal strip for protecting the metal strip from corrosion.
  • said splice construction comprising end portions of the tapes overlapping one another and having confronting faces at the overlap, a metal connector element located between the overlapping end portions of the tape, said connector element having a body portion and sharp projections extending in opposite directions from the body portion and penetrating through the plastic coating of the strips and into contact with the metal strip of each of the tapes of the splice construction to provide a continuous electric circuit between the strips of the tapes.
  • the splice construction described in claim 2 characterized by the connector being a metal sheet sandwiched between the overlapping end portions of the tapes, said metal sheet having a plurality of openings extending through it with the metal that is displaced from the openings forming tangs that extend upward from some of the openings around the edges thereof and that extend downward from others of the openings around the edges thereof to provide projections that penetrate the plastic coatings of the tapes, said splice construction being within an electrical cable containing a core including a conductor surrounded by electrical and having one of the tapes wrapped around the insulated conductor as a shield along a part of the length of the cable, and having the other tape wrapped around the length of the conductor as a shield along a different but contiguous part of the length of the cable, the overlapping ends of the tapes making the metal strips in the tapes a continuous circuit along the different parts of the cable, and said tapes being applied to the core as a shield and moisture barrier, the tangs having points on their ends that contact with the strips of
  • the splice construction described in claim 1 characterized by the connector being a different piece of metal from terized by the connector element being a metal sheet having a plurality of openings extending through it with the metal that is displaced from the openings forming tangs that extend upward from some of the openings around the edges thereof and that extend downward from others of the openings around the edges thereof to provide the projections that penetrate the plastic coatings on the tapes that are spliced together.
  • the splice construction described in claim 6 characterized by an electrical cable containing a core including a conductor surrounded by electrical insulation an having one of the tapes wrapped around the insulated conductor as a shield along a part of the length of the cable, and having another tape wrapped around a length of the conductor as a shield along a different but contiguous part of the electrical cable, the overlapping ends of the tapes making the metal strips in the tapes a continuous electric circuit along the different parts of the cable, and said tapes being applied to the core as a shield and moisture barrier therefor.
  • each tape being longitudinally wrapped around the core and the longitudinal edges of the tapes being secured together along seams extending lengthwise of the cable, said connector element extending circumferentially around the cable for substantially the full width of the tapes and having an axial length substantially less than its circumferential extent.
  • the splice construction described in claim 7 characterized by the connector element having the openings in it disposed in a plurality of axially extending rows and a plurality of longitudinally extending rows, alternate openings of each of the rows having their tangs extending in opposite directions from the body of the connector element for contact with a different one of the tapes.
  • the splice construction described in claim 1 characterized by the metal strips and the projections being made of metal of good electrical conductivity, said strips having a thickness of between approximately 4 and .8 mils and the coatings on the strips being of a thickness between approximately 2 and 5 mils.
  • the splice construction described in claim 10 characterized by the metal strips being aluminum, the projections being aluminum, and the coatings on the strips being a copolymer of polyethylene with reactive carboxyl groups that produce a chemical bond of the coating to the aluminum.

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  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Cable Accessories (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
US822370A 1969-05-07 1969-05-07 Splice for laminated tapes Expired - Lifetime US3564116A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82237069A 1969-05-07 1969-05-07

Publications (1)

Publication Number Publication Date
US3564116A true US3564116A (en) 1971-02-16

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Application Number Title Priority Date Filing Date
US822370A Expired - Lifetime US3564116A (en) 1969-05-07 1969-05-07 Splice for laminated tapes

Country Status (7)

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US (1) US3564116A (it)
JP (1) JPS4936754B1 (it)
CH (1) CH524874A (it)
DE (1) DE2021397A1 (it)
ES (1) ES377460A1 (it)
FR (1) FR2042956A5 (it)
GB (1) GB1295624A (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728472A (en) * 1972-03-31 1973-04-17 Gen Cable Corp Mechanical pressure type electrical connections for terminating and connecting metallic cable shields
US4581480A (en) * 1984-09-07 1986-04-08 Northern Telecom Limited Cable splice closure and strain relief
WO1994022181A1 (en) * 1993-03-24 1994-09-29 Telefonaktiebolaget Lm Ericsson An arrangement for establishing electrical contact in joints, and a method of producing the arrangement
US6398596B1 (en) * 1998-12-18 2002-06-04 Allied Bolt, Inc. Ground clamp
US20050224653A1 (en) * 2004-03-25 2005-10-13 Miener Steven J Cushioned grounding clamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2456400A1 (fr) * 1979-05-09 1980-12-05 Sicame Sa Armature de raccordement pour cables isoles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205299A (en) * 1961-03-03 1965-09-07 Hi Shear Corp Conductive connector
US3377422A (en) * 1966-01-26 1968-04-09 Amp Inc Splice assembly to connect cable ends together
US3435126A (en) * 1967-01-04 1969-03-25 Douglas L P Hamilton Means securing a cable sheath to a grounding and supporting member

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205299A (en) * 1961-03-03 1965-09-07 Hi Shear Corp Conductive connector
US3377422A (en) * 1966-01-26 1968-04-09 Amp Inc Splice assembly to connect cable ends together
US3435126A (en) * 1967-01-04 1969-03-25 Douglas L P Hamilton Means securing a cable sheath to a grounding and supporting member

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728472A (en) * 1972-03-31 1973-04-17 Gen Cable Corp Mechanical pressure type electrical connections for terminating and connecting metallic cable shields
US4581480A (en) * 1984-09-07 1986-04-08 Northern Telecom Limited Cable splice closure and strain relief
WO1994022181A1 (en) * 1993-03-24 1994-09-29 Telefonaktiebolaget Lm Ericsson An arrangement for establishing electrical contact in joints, and a method of producing the arrangement
CN1039069C (zh) * 1993-03-24 1998-07-08 艾利森电话股份有限公司 在接合区建立电接触的装置及其制造方法
US6398596B1 (en) * 1998-12-18 2002-06-04 Allied Bolt, Inc. Ground clamp
US20050224653A1 (en) * 2004-03-25 2005-10-13 Miener Steven J Cushioned grounding clamp
US7258304B2 (en) 2004-03-25 2007-08-21 The Boeing Company Cushioned grounding clamp

Also Published As

Publication number Publication date
CH524874A (de) 1972-06-30
ES377460A1 (es) 1972-07-01
DE2021397A1 (de) 1970-11-19
GB1295624A (it) 1972-11-08
FR2042956A5 (it) 1971-02-12
JPS4936754B1 (it) 1974-10-03

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