US3680027A - Ignition cable - Google Patents

Ignition cable Download PDF

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Publication number
US3680027A
US3680027A US135044A US3680027DA US3680027A US 3680027 A US3680027 A US 3680027A US 135044 A US135044 A US 135044A US 3680027D A US3680027D A US 3680027DA US 3680027 A US3680027 A US 3680027A
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cable
insulation
core
rubber
conductive
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US135044A
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Joseph Michael Vitale
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CAROL CABLE COMPANY Inc A CORP OF
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Avnet Inc
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Assigned to CAROL CABLE COMPANY, INC., A CORP. OF DE reassignment CAROL CABLE COMPANY, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AVNET, INC., A NY CORP.
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0063—Ignition cables

Definitions

  • One usual construction of automobile ignition cable includes a central conductive core of glass filaments bonded together with conductive rubber, surrounded with one or more layers of rubber insulation. Such cables are connected to terminals by stripping the insulation from a length of the conductive core, bending back the stripped portion of the core, and then crimping the terminal tightly in position engaging the bent'over portion.
  • Principal objects of the present invention include providing a cable which has all the desirable characteristics, i.e., airtight interface, suppression of interference and ease of stripping, of prior art constructions, but which does not require either the inclusion of any extra and special releasing" layer between the core and insulation, or impregnation of the core fibers with conductive particles.
  • Other objects include providing such a cable that is less expensive to manufacture than are existing constructions and which may be constructed using conventional equipment.
  • the invention features an ignition cable including a central conductive core directly and tightly engaged by a layer of surrounding insulation, the core comprising a plurality of flexible fibers bonded together with conductive rubber which defines the outer core surface, and the adjacent surfaces of the conductive rubber and surrounding insulation being relatively nonadherent.
  • a second aspect features a core which is free from impregnating conductive particles and consists essentially of the flexible fibers and bonding conductive rubber layer.
  • a conductive silicone dispersion of conductivity matching that of the graphite-impregnated fibers bonding the fibers together and insulation comprising a layer of synthetic, hi-dielectric rubber surrounded by braided glass reinforcement, which is in turn surrounded by an outer jacket of synthetic rubber.
  • the cable generally designated 10
  • a layer 16 of insulating rubber typically a hi-dielectric styrene butadiene rubber, is extruded directly over the outer cylindrical surface of conductive layer 14 so that the adjacent surfaces of the two layers, outer surface of conductive layer 14, and inner layer of insulating layer 16, tightly engage each other in an airtight manner.
  • a glass fiber overbraid l8 and an insulating rubber outer jacket 20 preferably are applied over insulation layer 16.
  • glass fibers 12 are rendered conductive by impregnation with conductive graphite particles, and the conductivity of the silicone dispersion is matched to that of the graphite-impregnated fibers so that both layer 14 and impregnated fibers 12 have a conductivity in the range of 3,000 to 7,000 ohms per foot.
  • the fibers 12, the impregnating graphite, and the bonding silicone dispersion of layer 14 together form the conductive core of cable 10.
  • the core fibers 12 are free from impregnating conductive particles, and the conductive cable core is formed by fibers l2 and layer 14 alone.
  • a length of the insulation namely layers l6, l8, and 20 is stripped to expose the interior core, so that the stripped core portion may be bent back over the insulating outer layer and attached to a terminal.
  • the adjacent surfaces of the core and insulation are in tight engagement, the material of the inner layer of insulation, layer 16, does not adhere to the material of the outer layer of the core, layer 14, thereby facilitating stripping of the insulation.
  • An ignition cable comprising:
  • said core comprising a plurality of flexible fibers bonded together with a conductive silicone dispersion rubber, said conductive rubber defining the outer surface of said core,
  • said insulation including a layer of insulating rubber defining the inner surface of said insulation, there being no intervening layer intermediate the inner surface of said insulation and the outer surface of said core whereby said surfaces directly engage each other, and directly engaging said outer surface of said core,
  • the conductive silicone dispersion rubber defining the outer surface of said core and the insulating rubber defining the inner surface of said insulation being relatively nonadherent whereby stripping of said insulation from said core is facilitated.
  • the cable of claim 1 wherein the insulation includes at least two layers of insulation and a layer of reinforcing braid intermediate said layers of insulation.
  • the cable of claim 12 wherein the conductivity of said conductive rubber is in the range of 3,000 to 7,000 ohms per foot.
  • the cable of claim 12 wherein said insulation includes at 17.
  • the cable of claim 16 wherein the inner one of said least two layers f insulation and a layer f i f i b id layers of insulation is a hi-dielectric styrene butadine rubber. intermediate said layers of insulation. 18.
  • the cable of claim 17 wherein the interface between 16.
  • the cable of claim wherein the inner one of said said surfacesis substantially airtight layers of insulation isasynthetic, hi-dielectric rubber. 5

Abstract

An ignition cable having an interior conductive core directly and tightly engaged by surrounding insulation, the engaged layers of the core and insulation being of material that are relatively nonadherent.

Description

O United States Patent 1151 3,680,027 Vitale 1451 July 25, 1972 IGNITION CABLE 2,601,337 6/1952 .lohannsen ..174 110 5 3,191,005 6/1965 Cox ..l74/120R [72] Cransmm 3,284,751 11/1966 Barker... ..174/102 so [73] Assignee: Avnet,lnc., New York, N.Y. 3,382,574 5/1968 Chadwick ..252/511 X [211 APPL 135,0 Insulation Directory No. 8 June/July 1969, Lake Publishing, Libert ville I11. .205- 206 RIted.S.A1|t D Y PP e l U pp ca on an Silicones Tech. Data Book 5- 35 Gen. Electric 7/69 p. 4. [63] Continuation-impart of Ser. No. 121,859, March 8,
1971 abandmed' Primary Examiner-E. A. Goldberg 52 u.s.c| ..338/2l4,338/66, 174/110 5,
174/120 SC 1 51 rm. c1 ..H0lc 3/00 1 1 ABSTRAQT [58] FieldotSearch ..338/66,214, 210; 174/1 10S,
174/120 R, 120 AR, 120 SC, 1 17 R, 102 5C; An ignition cable having an interior conductive core directly 252/511; 161/406; 117/6 and tightly engaged by surrounding insulation, the engaged layers of the core and insulation being of material that are [56] References Cited relatively nonadherent.
UNITED STATES PATENTS 18 Claims, 1 Drawing Figure 2,526,483 10/1950 Ingmanson ..174/117 R IGNITION CABLE This invention relates to ignition cables. This application is a continuation-in-part of my copending application, Ser. No. 121,859 filed Mar. 8, 1971 now abandoned.
One usual construction of automobile ignition cable includes a central conductive core of glass filaments bonded together with conductive rubber, surrounded with one or more layers of rubber insulation. Such cables are connected to terminals by stripping the insulation from a length of the conductive core, bending back the stripped portion of the core, and then crimping the terminal tightly in position engaging the bent'over portion.
Providing a cable construction which provides the required substantially airtight core-to-insulation interface and, at the same time, permits relatively easy stripping, has presented a major problem. In the past, it has been possible to solve this problem only by either sacrificing the highly desirable tight interface, or by providing an extra, otherwise superfluous, layer of some type of special releasing agent" between the core and insulation. A second problem, providing a core of the necessary conductivity, has required impregnation of the core fibers with conductive particles such as graphite. One typical construction is shown in US. Pat. No. 2,284,751 to Barker, wherein the glass core fibers are impregnated with conductive graphite particles and a releasing layer, of conductive graphite which must be uniformly distributed and which affects the overall conductivity of the cable, is provided between the core and insulation.
Principal objects of the present invention include providing a cable which has all the desirable characteristics, i.e., airtight interface, suppression of interference and ease of stripping, of prior art constructions, but which does not require either the inclusion of any extra and special releasing" layer between the core and insulation, or impregnation of the core fibers with conductive particles. Other objects include providing such a cable that is less expensive to manufacture than are existing constructions and which may be constructed using conventional equipment.
In one aspect, the invention features an ignition cable including a central conductive core directly and tightly engaged by a layer of surrounding insulation, the core comprising a plurality of flexible fibers bonded together with conductive rubber which defines the outer core surface, and the adjacent surfaces of the conductive rubber and surrounding insulation being relatively nonadherent. A second aspect features a core which is free from impregnating conductive particles and consists essentially of the flexible fibers and bonding conductive rubber layer. In preferred embodiments which include both aspects, there is featured a conductive silicone dispersion of conductivity matching that of the graphite-impregnated fibers bonding the fibers together and insulation comprising a layer of synthetic, hi-dielectric rubber surrounded by braided glass reinforcement, which is in turn surrounded by an outer jacket of synthetic rubber.
Other objects, features and advantages will appear from the following detailed description of preferred embodiments of the invention, taken together with the annexed drawing. The single view is a perspective, partially in section, of a flexible ignition cable constructed in accord with the present invention.
The cable, generally designated 10, has at its center a pluality of individual elements 12 of glass fibers impregnated and bonded together with a layer 14 of a conductive silicone dispersion rubber (sold by Dow Corning Corp). A layer 16 of insulating rubber, typically a hi-dielectric styrene butadiene rubber, is extruded directly over the outer cylindrical surface of conductive layer 14 so that the adjacent surfaces of the two layers, outer surface of conductive layer 14, and inner layer of insulating layer 16, tightly engage each other in an airtight manner. To increase the overall cable strength, a glass fiber overbraid l8 and an insulating rubber outer jacket 20 preferably are applied over insulation layer 16.
In a first preferred embodiment, glass fibers 12 are rendered conductive by impregnation with conductive graphite particles, and the conductivity of the silicone dispersion is matched to that of the graphite-impregnated fibers so that both layer 14 and impregnated fibers 12 have a conductivity in the range of 3,000 to 7,000 ohms per foot. in this first embodiment, the fibers 12, the impregnating graphite, and the bonding silicone dispersion of layer 14 together form the conductive core of cable 10.
In a second preferred embodiment, the core fibers 12 are free from impregnating conductive particles, and the conductive cable core is formed by fibers l2 and layer 14 alone.
In using cables of either embodiment, a length of the insulation, namely layers l6, l8, and 20, is stripped to expose the interior core, so that the stripped core portion may be bent back over the insulating outer layer and attached to a terminal. Although the adjacent surfaces of the core and insulation are in tight engagement, the material of the inner layer of insulation, layer 16, does not adhere to the material of the outer layer of the core, layer 14, thereby facilitating stripping of the insulation.
Other embodiments within the scope of the following claims will occur to those skilled in the art.
What is claimed is:
1. An ignition cable comprising:
a core; and,
insulation surrounding and tightly engaging said core,
said core comprising a plurality of flexible fibers bonded together with a conductive silicone dispersion rubber, said conductive rubber defining the outer surface of said core,
said insulation including a layer of insulating rubber defining the inner surface of said insulation, there being no intervening layer intermediate the inner surface of said insulation and the outer surface of said core whereby said surfaces directly engage each other, and directly engaging said outer surface of said core,
the conductive silicone dispersion rubber defining the outer surface of said core and the insulating rubber defining the inner surface of said insulation being relatively nonadherent whereby stripping of said insulation from said core is facilitated.
2. The cable of claim 1 wherein the interface between said surfaces is substantially airtight.
3. The cable of claim 1 wherein said core includes discrete particles of conductive graphite impregnating said fibers.
4. The cable of claim 3 wherein the conductivity of said conductive rubber and of said fibers impregnated with graphite are each in the range of 3,000 to 7,000 ohms per foot.
5. The cable of claim 1 wherein said insulating rubber layer is synthetic, hi-dielectric rubber and, the interface between said surfaces is substantially airtight.
6. The cable of claim 1 wherein the conductivity of said conductive rubber is in the range of 3,000 to 7,000 ohms per foot.
7. The cable of claim 1 wherein the insulation includes at least two layers of insulation and a layer of reinforcing braid intermediate said layers of insulation.
8. The cable of claim 7 wherein said conductive rubber has a conductivity matching the conductivity of the other portions of said core.
9. The cable of claim 8 wherein the inner one of said layers of insulation is a synthetic, hi-dielectric rubber.
10. The cable of claim 8 wherein the inner one of said layers of insulation is a hi-dielectric styrene butadine rubber.
11. The cable of claim 10 wherein the interface between said surfaces is substantially airtight,
12. The cable of claim 1 wherein said core is free from conductive particles impregnating said fibers and consists essentially of said fibers and said conductive rubber.
13. The cable of claim 12 wherein the interface between said surfaces is substantially airtight.
14. The cable of claim 12 wherein the conductivity of said conductive rubber is in the range of 3,000 to 7,000 ohms per foot.
15. The cable of claim 12 wherein said insulation includes at 17. The cable of claim 16 wherein the inner one of said least two layers f insulation and a layer f i f i b id layers of insulation is a hi-dielectric styrene butadine rubber. intermediate said layers of insulation. 18. The cable of claim 17 wherein the interface between 16. The cable of claim wherein the inner one of said said surfacesis substantially airtight layers of insulation isasynthetic, hi-dielectric rubber. 5

Claims (18)

1. An ignition cable comprising: a core; and, insulation surrounding and tightly engaging said core, said core comprising a plurality of flexible fibers bonded together with a conductive silicone dispersion rubber, said conductive rubber defining the outer surface of said core, said insulation including a layer of insulating rubber defining the inner surface of said insulation, there being no intervening layer intermediate the inner surface of said insulation and the outer surface of said core whereby said surfaces directly engage each other, and directly engaging said outer surface of said core, the conductive silicone dispersion rubber defining the outer surface of said core and the insulating rubber defining the inner surface of said insulation being relatively nonadherent whereby stripping of said insulation from said core is facilitated.
2. The cable of claim 1 wherein the interface between said surfaces is substantially airtight.
3. The cable of claim 1 wherein said core includes discrete particles of conductive graphite impregnating said fibers.
4. The cable of claim 3 wherein the conductivity of said conductive rubber and of said fibers impregnated with graphite are each in the range of 3,000 to 7,000 ohms per foot.
5. The cable of claim 1 wherein said insulating rubber layer is synthetic, hi-dielectric rubber and, the interface between said surfaces is substantially airtight.
6. The Cable of claim 1 wherein the conductivity of said conductive rubber is in the range of 3,000 to 7,000 ohms per foot.
7. The cable of claim 1 wherein the insulation includes at least two layers of insulation and a layer of reinforcing braid intermediate said layers of insulation.
8. The cable of claim 7 wherein said conductive rubber has a conductivity matching the conductivity of the other portions of said core.
9. The cable of claim 8 wherein the inner one of said layers of insulation is a synthetic, hi-dielectric rubber.
10. The cable of claim 8 wherein the inner one of said layers of insulation is a hi-dielectric styrene butadine rubber.
11. The cable of claim 10 wherein the interface between said surfaces is substantially airtight.
12. The cable of claim 1 wherein said core is free from conductive particles impregnating said fibers and consists essentially of said fibers and said conductive rubber.
13. The cable of claim 12 wherein the interface between said surfaces is substantially airtight.
14. The cable of claim 12 wherein the conductivity of said conductive rubber is in the range of 3,000 to 7,000 ohms per foot.
15. The cable of claim 12 wherein said insulation includes at least two layers of insulation and a layer of reinforcing braid intermediate said layers of insulation.
16. The cable of claim 15 wherein the inner one of said layers of insulation is a synthetic, hi-dielectric rubber.
17. The cable of claim 16 wherein the inner one of said layers of insulation is a hi-dielectric styrene butadine rubber.
18. The cable of claim 17 wherein the interface between said surfaces is substantially airtight.
US135044A 1971-04-19 1971-04-19 Ignition cable Expired - Lifetime US3680027A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792409A (en) * 1973-04-02 1974-02-12 Ransburg Corp Electrostatic hand gun cable
FR2232045A1 (en) * 1973-05-29 1974-12-27 Acheson Ind Inc
US4250075A (en) * 1979-02-05 1981-02-10 Dow Corning Corporation Electrically conductive polydiorganosiloxanes
US4369423A (en) * 1980-08-20 1983-01-18 Holtzberg Matthew W Composite automobile ignition cable
US4431982A (en) * 1979-02-05 1984-02-14 Dow Corning Corporation Electrically conductive polydiorganosiloxanes
US4704596A (en) * 1986-11-19 1987-11-03 Essex Group, Inc. Extrusion coated ignition wire
FR2645333A1 (en) * 1989-04-04 1990-10-05 Prestolite Wire Corp IGNITION CABLE AND METHOD FOR MANUFACTURING THE SAME
FR2660827A1 (en) * 1990-04-16 1991-10-18 Prestolite Wire Corp COIL IGNITION CABLE AND METHOD FOR MANUFACTURING THE SAME.
US5397860A (en) * 1993-10-29 1995-03-14 Splitfire, Inc. Multiple-core electrical ignition system cable
US5523534A (en) * 1993-06-28 1996-06-04 Vital Connections, Inc. Shielded carbon lead for medical electrodes
US6054028A (en) * 1996-06-07 2000-04-25 Raychem Corporation Ignition cables
US20040194996A1 (en) * 2003-04-07 2004-10-07 Floyd Ysbrand Shielded electrical wire construction and method of manufacture
US20070235012A1 (en) * 2005-04-04 2007-10-11 Lam Luk Mui J Ignition Apparatus
CN104715816A (en) * 2015-02-28 2015-06-17 安徽江淮电缆集团有限公司 Environment friendly armored and insulated light weight cable

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2526483A (en) * 1949-04-26 1950-10-17 Whitney Blake Co Method of minimizing adhesion between rubber insulation layers of electric conductors and the resultant article
US2601337A (en) * 1949-02-17 1952-06-24 Gen Electric Method for improving the adhesion of organopolysiloxanes to solid surfaces
US3191005A (en) * 1962-10-01 1965-06-22 John L Cox Electric circuit arrangement
US3284751A (en) * 1963-10-11 1966-11-08 Eltra Corp Resistor ignition lead
US3382574A (en) * 1964-11-10 1968-05-14 Air Reduction Method of making an electrical resistor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2601337A (en) * 1949-02-17 1952-06-24 Gen Electric Method for improving the adhesion of organopolysiloxanes to solid surfaces
US2526483A (en) * 1949-04-26 1950-10-17 Whitney Blake Co Method of minimizing adhesion between rubber insulation layers of electric conductors and the resultant article
US3191005A (en) * 1962-10-01 1965-06-22 John L Cox Electric circuit arrangement
US3284751A (en) * 1963-10-11 1966-11-08 Eltra Corp Resistor ignition lead
US3382574A (en) * 1964-11-10 1968-05-14 Air Reduction Method of making an electrical resistor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Insulation Directory No. 8 June/July 1969, Lake Publishing, Libertyville, Ill. pp. 205 206 *
Silicones Tech. Data Book 5 35 Gen. Electric 7/69 p. 4. *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792409A (en) * 1973-04-02 1974-02-12 Ransburg Corp Electrostatic hand gun cable
FR2232045A1 (en) * 1973-05-29 1974-12-27 Acheson Ind Inc
US4250075A (en) * 1979-02-05 1981-02-10 Dow Corning Corporation Electrically conductive polydiorganosiloxanes
US4431982A (en) * 1979-02-05 1984-02-14 Dow Corning Corporation Electrically conductive polydiorganosiloxanes
US4369423A (en) * 1980-08-20 1983-01-18 Holtzberg Matthew W Composite automobile ignition cable
US4704596A (en) * 1986-11-19 1987-11-03 Essex Group, Inc. Extrusion coated ignition wire
FR2645333A1 (en) * 1989-04-04 1990-10-05 Prestolite Wire Corp IGNITION CABLE AND METHOD FOR MANUFACTURING THE SAME
US5034719A (en) * 1989-04-04 1991-07-23 Prestolite Wire Corporation Radio frequency interference suppression ignition cable having a semiconductive polyolefin conductive core
FR2660827A1 (en) * 1990-04-16 1991-10-18 Prestolite Wire Corp COIL IGNITION CABLE AND METHOD FOR MANUFACTURING THE SAME.
US5523534A (en) * 1993-06-28 1996-06-04 Vital Connections, Inc. Shielded carbon lead for medical electrodes
WO1995012205A1 (en) * 1993-10-29 1995-05-04 Splitfire, Inc. Improved multiple-core electrical ignition system cable
US5397860A (en) * 1993-10-29 1995-03-14 Splitfire, Inc. Multiple-core electrical ignition system cable
US6054028A (en) * 1996-06-07 2000-04-25 Raychem Corporation Ignition cables
US20040194996A1 (en) * 2003-04-07 2004-10-07 Floyd Ysbrand Shielded electrical wire construction and method of manufacture
US20040200634A1 (en) * 2003-04-07 2004-10-14 Midcon Cables Co., Llc Shielded electrical wire construction and method of manufacture
US20070235012A1 (en) * 2005-04-04 2007-10-11 Lam Luk Mui J Ignition Apparatus
US7665451B2 (en) * 2005-04-04 2010-02-23 Joe Luk Mui Lam Ignition apparatus
US20100108043A1 (en) * 2005-04-04 2010-05-06 Luk Mui Joe Lam Ignition apparatus
US7819109B2 (en) * 2005-04-04 2010-10-26 Lam Luk Mui Joe Ignition apparatus
EP1872374B1 (en) * 2005-04-04 2017-05-17 Luk Mui Joe Lam Ignition apparatus
CN104715816A (en) * 2015-02-28 2015-06-17 安徽江淮电缆集团有限公司 Environment friendly armored and insulated light weight cable

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