US3813645A - Spark plug terminal - Google Patents

Spark plug terminal Download PDF

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Publication number
US3813645A
US3813645A US00225581A US22558172A US3813645A US 3813645 A US3813645 A US 3813645A US 00225581 A US00225581 A US 00225581A US 22558172 A US22558172 A US 22558172A US 3813645 A US3813645 A US 3813645A
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US
United States
Prior art keywords
indentation
terminal
terminal according
face
included angle
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
US00225581A
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English (en)
Inventor
H Elliott
S Grebik
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.)
Lear Corp EEDS and Interiors
Original Assignee
Essex International Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Essex International Inc filed Critical Essex International Inc
Priority to US00225581A priority Critical patent/US3813645A/en
Priority to IT19885/73A priority patent/IT978691B/it
Priority to GB593073A priority patent/GB1405726A/en
Priority to DE2306136A priority patent/DE2306136C3/de
Priority to CA163,475A priority patent/CA979505A/en
Priority to FR7304785A priority patent/FR2171420B1/fr
Priority to ES411504A priority patent/ES411504A1/es
Priority to JP48017390A priority patent/JPS51244B2/ja
Priority to ES421118A priority patent/ES421118A1/es
Application granted granted Critical
Publication of US3813645A publication Critical patent/US3813645A/en
Assigned to UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF DE reassignment UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ESSEX GROUP, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/20—Coupling parts carrying sockets, clips or analogous contacts and secured only to wire or cable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
    • H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2101/00—One pole

Definitions

  • ABSTRACT A spark plug terminal having an initially tubular body portion between its ends is provided with an axially elongated indentation in one side thereof, the maximum depth of the groove being such that the inner surface of the indentation bears against the inner sur face of the diametrically opposed side of the body portion and the width of the indentation being such that the sides of the latter engage the corresponding sides of the body portion.
  • the body portion may remain axially straight or it may be bent between its ends to form an elbow, the direction of bending being such that the groove is at the inside of the elbow.
  • One end of the terminal is provided with means for attaching it to a conductor and the opposite end of the terminal is provided with means for connecting it to the electrode of a spark plug.
  • a sleeve or boot of dielectric material is assembled with the terminal.
  • the invention disclosed herein relates to spark plug terminals and to their method of manufacture, and more particularly to spark plug terminals having improved structural and electrical characteristics and which are more easily and inexpensively produced than spark plug terminals currently in use.
  • spark plug terminals be longer than those previously in use so as to assist in conducting heat away from the well in which a spark plug is located.
  • Most of the spark plug terminals utilized on automotive vehicle engines require that the terminal be bent between its ends so as to facilitate connection of the ignition wires to the spark plug electrodes.
  • the terminals Conventionally, the terminals have parts of their bodies cut away to facilitate the bending of the terminals. The cutting away of the terminals for this purpose weakens the terminals, and the adverse effect of such weakening is magnified in the longer terminals presently required.
  • a spark plug terminal constructed in accordance with the invention overcomes the disadvantages referred to above by making it unnecessary to cut a terminal body to enable it to be bent, thereby avoiding the formation of sharp points or burrs and avoiding weakening of the terminal, both structurally and electrically.
  • Such a terminal when bent. is bent about a large radius, as compared to the radii of conventional terminals, thereby making it possible to assemble an axially straight di-electric sleeve with the terminal without subjecting the sleeve to undue physical stress.
  • An object of this invention is to provide a spark plug terminal which need not be cut to enable its being bent, thereby avoiding the formation of sharp points and avoiding the structural and electrical weakening of the terminal.
  • Another object of the invention is to provide a spark plug terminal which can be bent about a relatively large radius, as compared to the radii of conventional termirials, so as to enable axially straight dielectric boots or sleeves to be assembled on the tenninal without subjecting the boot to undue physical stress.
  • a further object of the invention is to provide a method of manufacturing a terminal of the'kind described.
  • FIG. 1 is a top plan view of a spark plug terminal constructed in accordance with the invention and illustrating the terminal prior to its being bent;
  • FIG. 2 is a bottom plan view of the terminal shown in FIG. 1;
  • FIG. 3 is an end elevational view of the terminal shown in FIG. 1 as viewed from the right-hand end thereof;
  • FIG. 4 is a view partly in side elevation and partly in section of a terminal fitted into a forming die and illustrating the first stage of a three-stage terminal bending operation
  • FIG. 5 is a vertical sectional view taken on the line 5-5 of FIG. 4;
  • FIG. 6 is a bottom plan view of a terminal illustrating its appearance following the initial bending operation
  • FIG. 7 is a view similar to FIG. 4, but illustrating the second stage of the three-stage bending process
  • FIG. 8 is a vertical sectional view taken on the line 8-8 of FIG. 7;
  • FIG. 9 is a bottom plan view ofa terminal illustrating its configuration following the completion of the second stage of the bending process
  • FIG. 10 is a view similar to FIG. 7, but illustrating the third stage of the bending process to obtain a bent terminal forming an included angle of about 130;
  • FIG. 11 is a vertical sectional view taken on the line llll of FIG. 10;
  • FIG. 12 is a side elevational view of a terminal illustrating its configuration following the third stage of the bending process, one end of the terminal being crimped to a conductor;
  • FIG. 13 is a fragmentary, isometric view of the terminal shown in FIG. 12 and particularly illustrating the inside of the elbow formed by the bending process;
  • FIG. 14 is a view similar to FIG. 12, but illustrating a terminal bent to fomi an included angle of about 1 10 and enclosed within a dielectric boot;
  • FIG. 15 is a side elevational view of a terminal bent to form an included angle of about FIG. 16 is a side elevational view of a slightly modified terminal.
  • FIG. 17 is a sectional view taken on the line 17-17 of FIG. 16.
  • a spark plug terminal constructed according to the invention is formed from a blank of electrically conductive metal having at one end a flange which may be rolled into a substantially U-shaped connector 1 for crimping onto the end of an insulated spark plug wire 2 (FIG. 12). At its opposite end the blank has a flange which may be rolled to form a spark plug electrode socket 3.
  • the confronting ends of the flange meet to form a split seam 4 and may be provided with interlocking fingers (not shown) as is conventional and which underlie a generally C-shaped spring clip 5 having a projection 6 adjacent each end thereof which extends through correspondingly spaced openings 7 (FIG. 12) formed in the flange so as to enable the projections to provide yieldable gripping means for the electrode (not shown) of a spark plug.
  • the blank from which the terminal is formed is notched at opposite ends of the body 8 as at 10 and 11 to enable flexure of the connector 1 and the socket 3 without causing corresponding flexure of the body 8.
  • the terminal shown in FIGS. 1, 2 and 3 is axially straight, i.e., not bent between its ends, and it may be used in this condition if desired. It is preferred, however, that the terminal be bent between the ends of the body portion 8 so as to facilitate its bridging the distance between the conductor 2 and the spark plug electrode.
  • Apparatus for bending the terminal comprises a first stage die 12 having a base 13 provided with a semicircular, axially extending groove 14 therein, the depth of the groove corresponding to half the outside diameter of the body portion 8.
  • the die 12 also includes an upper or cover member 15 having an axially extending, semicircular groove 16 in its lower surface which mates with the groove 14 and forms a cylindrical cavity for the reception of the body portion 8.
  • the die cover 15 has an axially extending slot 17 which communicates with the groove 16 along the longitudinal center line of the latter, the length of the slot 17 corresponding substantially to the length of the body portion 8. To condition the die for use, the cover 15 is removed, a terminal is fitted into the groove 14 with the seam 9 lowermost, and the cover 15 is replaced.
  • a first stage forming punch 18 which may be supported on the reciprocable platen (not shown) of a press or the like.
  • the punch has a depending tongue 19 of such size as to fit freely within the slot 17 and of such height as to correspond substantially to the distance from the base 14 to the upper surface of the cover 15.
  • the tongue has a lower surface 20 which is arcuate both longitudinally and transversely.
  • the longitudinal radius of the surface 20 corresponds to one-half the width of the tongue, so as to form a smooth curve from one side to the other of the tongue, and the transverse radius of the surface 20 corresponds to one-half the thickness of the tongue so as to form a smooth curve from one face to the other of the tongue.
  • the thickness of the tongue 19 is substantially less than the diameter of the body portion 8.
  • the wall thickness of the body portion 8 is 0.020 inch, and if the inside diameter of the body portion is 0.250 inch, the thickness of the tongue 19 may be 0.070 inch, or approximately 0.28 times the inside diameter of the body portion.
  • Movement of the punch 18 into and out of the die 12 results in an axial indentation 21 being formed in that wall of the body portion 8 which is opposite the seam 9.
  • the indentation 21 is arcuate from end to end and has a maximum depth such that the inner surface of the indentation tangentially engages the inner surface of the seamed side of the body portion, but the side walls of the indentation 21 are spaced from the sides of the nondeformed portion of the body 8 as is shown in FIG. 5.
  • the indented terminal is transferred to a second stage die 22 having a base 23 provided with a longitudinally extending groove 24 in its upper surface.
  • the base 23 of the die 22 is identical in all respects to the base 13 of the die 12.
  • the die 22 includes a cover 25 having an axial groove 26 complementary to and overlying the groove 24.
  • the cover 25 has an axially extending slot 27 in communication with the groove 26.
  • the axial length of the slot 27 corresponds to the length of the slot 17, but the width of the slot 27 is considerably greater than the width of the slot 17 so as to enable it to accommodate a tongue 28 of a punch 29, the punch 29 corresponding to the punch 18 except for the width of the tongue.
  • the lower surface of the tongue 28 is arcuate longitudinally and transversely.
  • the longitudinal arc corresponds to the longitudinal arc on which the surface 20 of the tongue 19 is formed and the transverse arc of the tongue 28 forms a smooth curve from one face to the other of the tongue.
  • the width of the tongue 28 corresponds substantially to the inside diameter of the body portion 8, less two wall thicknesses thereof. Thus, if the inside diameter of the body 8 is 0.250 inch, and if the wall thickness of the body is 0.020 inch, then the thickness ofthe tongue 28 may be 0.210 inch. It is preferred, however, to form the tongue 28 to a width slightly less than that specified above so as to allow for some tolerance in the wall thickness of the body 8. Normally a tolerance of 0.002 inch will be sufficient and, if this tolerance is provided, the width of the tongue 28 will be 0.208 inch, rather than 0.210 inch.
  • Movement of the tongue 28 into and out of the die 22 causes the side walls of the indentation 21 in the body 8 to be expanded into engagement with the side walls of the nondeformed portion of the body, as is indicated in FIG. 8, so as to produce a wider indentation 30.
  • the width of the indentation 30 corresponds substantially to the inside diameter of the body 8, less two wall thicknesses.
  • the terminal is transferred to a third die 31 having a base 32 provided with a generally V-shaped groove 33 in its upper surface, the diameter of the groove corresponding substantially to the original diameter of the body 8.
  • the terminal is placed in the groove 33 with the indentation 30 uppermost.
  • the groove 33 has its lowest point at the center of the die member 32 and those portions of the groove on opposite sides of the lowest point diverge upwardly uniformly. In the embodiment shown in FIG.
  • the die 31 also includes a cover 34 having an axially extending slot 35 therein overlying the groove 33 and of such length as to accommodate a punch tongue 36 having an arcuate lower surface 37.
  • the thickness of the tongue corresponds to the width of the indentation 30, but its axial width is less than that of either of the tongues 19 or 28.
  • the axial width of the tongue 36 should be such as to enable the arc of the surface 37 to be formed on a radius corresponding to that on which the body 8 is to be bent and without stressing the opposite ends of the indentation 30. The axial width of the tongue 36, therefore, will vary depending upon the degree of bending to be imparted to the terminal body 8.
  • the length of the tongue 36 is such as to enable it to move into the die 31 a distance sufficient to engage the base of the indentation 30 and deform or bend the body 8 to conform to the V-shaped configuration of the groove 33.
  • the opposite ends of the body portion form an included angle of 130.
  • FIG. 14 discloses a terminal having an included angle of 1 between the opposite ends of the body and the terminal shown in FIG. 15 has an included angle of 90 between the opposite ends of the body, but in both instances the radius of the elbow corresponds to the radius on which the elbow 38 is formed. It will be understood that the bending of the terminals such as those disclosed in FIGS. 14 and 15 necessitates substitution for the die 31 of other dies in which the terminal accommodating grooves are configured to form the desired included angle.
  • the terminal disclosed in FIGS. 16 and 17 is the same as those previously described except that the indentation is formed in one side of the body portion 8 which is spaced only 90 from the seam 9, rather than in the side which is diametrically opposite the seam.
  • any of the terminals herein disclosed may be sheathed in a boot or sleeve 39, formed of dielectric material such as silicone rubber, which initially is axially straight, but which has sufficient resiliency to be slid over the terminal and conform to the angular configuration thereof. Due to the relatively large radius of the elbow 38, as compared to the diameter of the body 8, a silicone rubber sleeve may conform to the configuration of the terminal without being subjected to significant pinching at the inside of the elbow or significant tension at the outside of the elbow.
  • An electrical terminal comprising an uninterrupted tubular, electrically conductive body and connector means at opposite ends of said body for connection to electrical terminals, said connector means being notched adjacent the opposite ends of said body, said body being deformed radially inwardly thereof between its ends and from one side of said body toward the opposite side thereof to form an elongate, axially arcuate indentation of less width than the diametral dimension of said body, said indentation having a bottom and opposed sides, the bottom of said indentation at its deepest point being in face to face engagement with the opposite side of said body and the opposed sides of said indentation at said deepest point being in face to face engagement with the respective adjacent sides of said body, whereby the entire deformed wall portion of said indentation at the deepest point thereof is in face to face engagement with the entireundeformed wall portion of said body at said point.
  • a terminal according to claim 1 wherein said indentation is arcuate transversely of said body.
  • a terminal according to claim 1 wherein said body is bent between its ends to form an elbow, said indentation being at the inside of the elbow.
  • a terminal according to claim 1 wherein said body is substantially cylindrical in cross-section except for said indentation.
  • a method of making an electrical terminal having between its ends a cylindrical, elongate body formed of electrically conductive material, aid method comprising deforming one side of said body between its ends radially inwardly of said body toward the opposite side thereof to form an elongate, axially arcuate indentation having a predetermined radius such that the deepest point of said indentation is in face to face engagement with the opposite side of said body, said indentation being of such width that at said deepest point thereof the opposed sides of said indentation are in face to face engagement with the respective ajdacent sides of said body; and bending said body at said deepest point of said indentation about a radius less than said predetermined radius to form an elbow between the ends of said body, the direction of bending said body being such that said indentation is at the inside of said elbow.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Spark Plugs (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
US00225581A 1972-02-11 1972-02-11 Spark plug terminal Expired - Lifetime US3813645A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US00225581A US3813645A (en) 1972-02-11 1972-02-11 Spark plug terminal
IT19885/73A IT978691B (it) 1972-02-11 1973-01-31 Terminale per candela
GB593073A GB1405726A (en) 1972-02-11 1973-02-07 Spark plug terminal
CA163,475A CA979505A (en) 1972-02-11 1973-02-08 Spark plug terminal
DE2306136A DE2306136C3 (de) 1972-02-11 1973-02-08 Elektrische Verbindungsklemme für Zündkerzenkabel sowie Herstellungsverfahren dafür
FR7304785A FR2171420B1 (de) 1972-02-11 1973-02-09
ES411504A ES411504A1 (es) 1972-02-11 1973-02-10 Un dispositivo terminal electrico.
JP48017390A JPS51244B2 (de) 1972-02-11 1973-02-12
ES421118A ES421118A1 (es) 1972-02-11 1973-12-04 Un metodo de fabricar un terminal electrico.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00225581A US3813645A (en) 1972-02-11 1972-02-11 Spark plug terminal

Publications (1)

Publication Number Publication Date
US3813645A true US3813645A (en) 1974-05-28

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ID=22845438

Family Applications (1)

Application Number Title Priority Date Filing Date
US00225581A Expired - Lifetime US3813645A (en) 1972-02-11 1972-02-11 Spark plug terminal

Country Status (8)

Country Link
US (1) US3813645A (de)
JP (1) JPS51244B2 (de)
CA (1) CA979505A (de)
DE (1) DE2306136C3 (de)
ES (2) ES411504A1 (de)
FR (1) FR2171420B1 (de)
GB (1) GB1405726A (de)
IT (1) IT978691B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009924A (en) * 1976-03-18 1977-03-01 General Motors Corporation Spark plug connector assembly
US4209221A (en) * 1978-09-27 1980-06-24 General Motors Corporation Two-piece socket terminal
US5114361A (en) * 1989-09-11 1992-05-19 Siemens Aktiengesellschaft Arresting mechanism/lock for coaxial plug connectors
US6000976A (en) * 1993-11-30 1999-12-14 Yazaki Corporation Terminal for passing through waterproof rubber plug and method of producing terminal
US20040067685A1 (en) * 2002-10-04 2004-04-08 Special Mine Services Panel-mount connector for an electrical cable
US20060044728A1 (en) * 2004-07-28 2006-03-02 Kim Jun-Ho Secondary protective element for secondary battery
US20100087106A1 (en) * 2008-10-07 2010-04-08 Fci Americas Technology, Inc. Modifiable electrical connector lug

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3380657D1 (en) * 1982-04-30 1989-11-02 Prestolite Wire Corp Ignition wire terminal
FR2538174B1 (fr) * 1982-12-16 1985-06-28 Electricfil Embout connecteur pour cable electrique
US4797115A (en) * 1987-11-13 1989-01-10 Prestolite Wire Corporation Angled boot for angled spark plug cable terminals
DE202007005264U1 (de) * 2007-04-10 2008-08-14 Weidmüller Interface GmbH & Co. KG Schirmhülse
CN101885015B (zh) * 2010-04-26 2011-12-21 晋西工业集团有限责任公司 一种金属棒料异形环状成形模具及成形方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285275A (en) * 1942-06-02 Bent tube section and a method of
US2511806A (en) * 1950-06-13 Electrical connector
US2553083A (en) * 1948-05-01 1951-05-15 Essex Wire Corp Sleeve type elbow terminal
GB1025186A (en) * 1962-11-20 1966-04-06 Gunnar Ingemansson Improvements in connectors for electrical cables and wires
US3335392A (en) * 1965-07-19 1967-08-08 Essex Wire Corp Terminal construction
DE1910179A1 (de) * 1968-03-01 1969-11-13 Lucas Industries Ltd Stecker-Anschlusseinrichtung
US3597723A (en) * 1970-05-01 1971-08-03 Microdot Inc Spark plug terminal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563761A (en) * 1945-09-20 1951-08-07 Bendix Aviat Corp Socket connector having an indented solder wall
US2648827A (en) * 1952-01-19 1953-08-11 Fred G Krueger Electrical socket connector formed by alternate bands

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285275A (en) * 1942-06-02 Bent tube section and a method of
US2511806A (en) * 1950-06-13 Electrical connector
US2553083A (en) * 1948-05-01 1951-05-15 Essex Wire Corp Sleeve type elbow terminal
GB1025186A (en) * 1962-11-20 1966-04-06 Gunnar Ingemansson Improvements in connectors for electrical cables and wires
US3335392A (en) * 1965-07-19 1967-08-08 Essex Wire Corp Terminal construction
DE1910179A1 (de) * 1968-03-01 1969-11-13 Lucas Industries Ltd Stecker-Anschlusseinrichtung
US3597723A (en) * 1970-05-01 1971-08-03 Microdot Inc Spark plug terminal

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009924A (en) * 1976-03-18 1977-03-01 General Motors Corporation Spark plug connector assembly
US4209221A (en) * 1978-09-27 1980-06-24 General Motors Corporation Two-piece socket terminal
US5114361A (en) * 1989-09-11 1992-05-19 Siemens Aktiengesellschaft Arresting mechanism/lock for coaxial plug connectors
US6000976A (en) * 1993-11-30 1999-12-14 Yazaki Corporation Terminal for passing through waterproof rubber plug and method of producing terminal
US20040067685A1 (en) * 2002-10-04 2004-04-08 Special Mine Services Panel-mount connector for an electrical cable
US20060044728A1 (en) * 2004-07-28 2006-03-02 Kim Jun-Ho Secondary protective element for secondary battery
US20100087106A1 (en) * 2008-10-07 2010-04-08 Fci Americas Technology, Inc. Modifiable electrical connector lug
US7955101B2 (en) * 2008-10-07 2011-06-07 Hubbell Incorporated Modifiable electrical connector lug

Also Published As

Publication number Publication date
FR2171420B1 (de) 1977-08-19
DE2306136B2 (de) 1979-03-08
FR2171420A1 (de) 1973-09-21
CA979505A (en) 1975-12-09
ES421118A1 (es) 1976-06-16
DE2306136A1 (de) 1973-08-30
ES411504A1 (es) 1976-02-01
DE2306136C3 (de) 1979-11-15
JPS51244B2 (de) 1976-01-06
JPS4888329A (de) 1973-11-19
GB1405726A (en) 1975-09-10
IT978691B (it) 1974-09-20

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AS Assignment

Owner name: UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ESSEX GROUP, INC.;REEL/FRAME:004933/0578

Effective date: 19880223