US3902154A - Strain relief - Google Patents

Strain relief Download PDF

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Publication number
US3902154A
US3902154A US443730A US44373074A US3902154A US 3902154 A US3902154 A US 3902154A US 443730 A US443730 A US 443730A US 44373074 A US44373074 A US 44373074A US 3902154 A US3902154 A US 3902154A
Authority
US
United States
Prior art keywords
wire
sides
space
termination
tab
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
US443730A
Other languages
English (en)
Inventor
William H Mckee
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.)
Globe Motors Inc
Original Assignee
TRW 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 TRW Inc filed Critical TRW Inc
Priority to US443730A priority Critical patent/US3902154A/en
Priority to GB48672/74A priority patent/GB1490198A/en
Priority to SE7414500A priority patent/SE7414500L/xx
Priority to CA214,229A priority patent/CA1027199A/en
Priority to FR7439074A priority patent/FR2261631A1/fr
Priority to BE151018A priority patent/BE822788A/xx
Priority to NL7415565A priority patent/NL7415565A/xx
Priority to IT30005/74A priority patent/IT1026656B/it
Priority to DK629174A priority patent/DK629174A/da
Priority to JP49137841A priority patent/JPS50114593A/ja
Priority to DE2456977A priority patent/DE2456977C3/de
Priority to NO744355A priority patent/NO744355L/no
Application granted granted Critical
Publication of US3902154A publication Critical patent/US3902154A/en
Assigned to LABINAL COMPONENTS AND SYSTEMS, INC., A DE CORP. reassignment LABINAL COMPONENTS AND SYSTEMS, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TRW INC., A CORP. OF OH
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
    • 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
    • H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
    • H01R4/2445—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives
    • H01R4/2466—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives the contact members having a channel-shaped part, the opposite sidewalls of which comprise insulation-cutting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
    • H01R13/5804—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable comprising a separate cable clamping part
    • H01R13/5808—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable comprising a separate cable clamping part formed by a metallic element crimped around the cable

Definitions

  • a relief wire terminating system with particular regard to a strain relief means provided as an integral part of the system.
  • side walls define a channel for receiving an insulated wire.
  • a tab ex- 339/223 S, 97 R, 97 P, 98, 99 R tends from the top of each wall at an angle, downward References Cited and inward into the space.
  • the tabs terminate in edges UNITED STATES PATENTS defining a wire passing space between them, and
  • the invention relates to wire termination systems. It particularly relates to strain relief means' assoeiate'd with wire termination systems.
  • strain relief means for connectors are .built into the insulators which retain the terminations and/or the contact members. In other cases, strain relief is accomplished by additional hardware such as clamps. These usually operate by squeezing or otherwise gripping the wire and holding it firm at a point to the rear of the point of termination. It is the general desire to avoid the transmittal of forces on the wire or movement of the wire to the point of actual termination.
  • miniaturized high density connectors in fact of miniaturized electrical and electronic components in general, has produced problems in the design of strain relief means strong enough to be able to effec tively take up the strains expected, while being'constructed in the space and of the materials associated with such components. It is apparent that miniaturization means the use of small, thin, and relatively weak items. Yet, in use, the forces imposed on the item s usually are not proportionately reduced.
  • the termination system described herein and particularly the strain relief means eliminate or reduce the majority of these problems while providing an economical form. It is especially useful with high density miniaturized connectors of the type commonly used in cable to-cable and rack and panel installations in telecommunications systems having the above specification. These items are required to be produced in very high volumes with severe criteria for reliability and adherence to specifications as noted above.
  • a wire termination system in particular a strain relief as an integral part of the termination system where an insulated wire is retained in a wire receiving channel between side walls by tabs extending from the upper edge of the side walls angularly downward and converging.
  • the terminal edges of the tabs are spaced apart defining a wire passing space between them for the installation of a wire therethrough and to resist take up strains imposed upon the wire.
  • FIG. 1 is a partial perspective view of a preferred embodiment of the invention.
  • FIG. 2 is a partial side view of a preferred embodiment of the invention.
  • FIG. 3 is a partial top view of a preferred embodiment of the invention.
  • FIG. 4 is a sectional view through line IVIV of FIG. 2 of a preferred embodiment of the invention. 7 v
  • FIG. 5 is a sectional perspective view of a high contact density ribbon type connector employing a preferred embodiment of the invention.
  • FIG. 6 is a perspective view of a high contact density ribbon type contact element employing a preferred embodiment of the invention with wires assembled.
  • strain relief means of the invention is illustrated. as part of the wire receiving or termination portion of a ribbon type contact element employed as shown in FIG. 5 in a high contact density ribbon type connector.
  • the ribbon type contact is formed from a single sheet of metal by punching, bending, forming and otherwise working the sheet into the desired shape.
  • 0.006 inch thick cadmium bronze sheet metal is used.
  • reference numerals having a sub- 0 refer to identical reversed items as are identified by the major numeral. In the discussion, only the major reference numeral will be cited, but it will be understood to also comprehend the sub -a numerals, unless otherwise noted.
  • the wire receiving portion has a channel-like body defined by sides 2, and a bottom 3 into which the wire 4 is fitted.
  • the wire 4 is terminated for electrical contact between the jaws 5, formed-in from the sides 2.
  • a more detailed description of this termination means is contained in co-pending application Ser. No. 443,678 filed Feb. 19, I974.
  • the strain relief means is located to the rear of the termination means and is separated therefrom by a slot 6, in the sides. This separation permits limited resilient flexing of the strain relief means without transmitting movement forwardly to the electrical termination points, as will be more fully explained later.
  • the sides 2 in the strain relief area are spaced so as to easily but firmly receive the insulated wire 4 in the channel.
  • Formed over from the top of the sides 2 are tabs 7. These tabs extend at an angle downward and convergently into the channel.
  • the terminal edges 8 of the tabs are opposed and spaced apart a distance smaller than the wire intended to be received in the channel, defining between them a wire passing space and beneath them a wire receiving space.
  • the wire passing space should be larger than the conductor of the wire but smaller than the outside diameter of the insulation of the wire.
  • Dimples 9 are formed in the sides 2 immediately behind the tabs and substantially proximate to the terminal edges 8. It has been found preferable to form the tabs 7 in contact with the respective dimples 9.
  • the wire passing space between the terminal edges 8 of the tabs 7 is 0.012 inches.
  • the sides 2 are spaced apart 0.038 inch.
  • the dimples 9 extend 0.003 inch into the wire receiving space.
  • the diameter of 24 gauge solid wire is 0.020 inch. Due to the outward movement permitted as described below, the wire passing space after insertion is increased to about 0.023 inches.
  • an insulated wire 4 is positioned over the strain relief portion and with a segment over the electrical termination portion.
  • the wire 4 is then pushed downward into the channel usually by a specially designed apparatus.
  • the wire 4 passes the tabs 7 and especially their terminal edges 8 they are urged to separate somewhat to permit it to pass.
  • the diples 9 prevent collapse of the tabs 7 against the sides 2.
  • the tabs 7 therefore retain their angular orientation convergently downward and into the wire receiving space.
  • the wire is inserted into the channel, its insulative cover deforms elastically somewhat as illustrated in FIG. 4.
  • the terminal edges 8 be able to move apart somewhat to permit the wire to pass.
  • this movement apart should be at least somewhat within the resiliency of the structure, and also should exploit the ability of the elastomeric insulative coating of the wire to deform/This could be achieved, in part, by forming the tabs 7 slightly away from the dimples 9, although it has been found preferable to form the tabs 7 touching the dimples 9. It may also be achieved by permitting slight outward movement of the sides 2 as they reside in the insulator 10 (FIG. 5). In order to prevent this movement and other strains from being transmitted to the termination portions, the slots 6 have been formed in the sides 2.
  • FIG. 2 is a view taken at the section IV-IV shown in FIG. 2. Some deformation of the insulative cover of the wire is seen, indicating the type of snug fit achieved. The tabs 7 are firmly holding the wire in place against upward movement.
  • the ribbon type contact element 11 is shown installed in an insulating high density connector body I0.
  • the sides 2 of the strain relief are supported by ribs 12.
  • the ribs 12 are formed slightly thinner providing a larger opening in order to permit the slight outward movement of the sides as the wire is inserted, as explained above.
  • the fit in the ribs 12 is more intimate since movement there is undesirable.
  • the strain relief means will absorb movements and forces which would degrade or destroy the efficacy of the electrical contact at the termination portion.
  • a strain relief as an integral part of the termination system comprising,
  • a wire passing means extending from the upper portion of at least one of the sides, defining a wire passing space effective to resiliently permit passage through it by movement transverse to its axis, of a wire having a diameter greater than the wire passing space and the wire passing means also defining a wire restraining space below it in the channel for restraining movement out of the channel of a wire inserted in the wire restraining space.
  • wire passing means is a tab extending from the upper edge of at least one side angularly downward into the wire receiving space and toward the other side and terminating to define the wire passing space.
  • a strain relief means as an integral part of the contact element comprising;
  • tab means extending from the upper edge of each side oppositely and convergently into the wire receiving channel at an angle downward and away from their respective sides and terminating to define a wire restraining space below them and a narrowed wire passing space between them; the tab means being effective to resiliently permit passage through the wire passing space of a wire having a diameter greater than the wire passing space, moved transversely of its axis, and to restrain movement out of the channel of a wire inserted into the wire restraining space.
  • the electrical connector of claim 6 further comprising means permitting limited resilient outward movement of the terminal ends of the tab means when a wire is passed downward past them into the wire restraining space.
  • the insulating housing has integral walls adjacent the sides of each contact for locating the contact elements and which walls are spaced slightly away from the contact elements at the area of the sides of the strain relief means in order to permit slight movement of the sides and thereby at least in part the resilient movement of the terminal ends of the tab means.
  • the insulating housing has integral walls adjacent the sides of each contact for locating the contact elements and which walls are spaced slightly away from the contact elements at the area of the sides of the strain relief means in order to permit slight flexing of the sides and thereby at least in part the resilient movement of the terminal ends of the tab means.
  • the electrical connector of claim 10 wherein the contact elements are arranged in at least one row and the walls are defined by ribs separating the contact elements in the row.
  • a ribbon type electrical contact element formed from thin sheet comprising;
  • a termination portion comprising a termination means and a strain relief means and spaced apart facing sides defining a wire receiving channel
  • the termination means comprising at least one pair of wire contacting jaws, the jaws being oppositely positioned and formed-in from the sides and extending into the wire receiving channel;
  • the strain relief means comprising;
  • tab means extending oppositely from the upper edge of each side angularly downward and convergently into the wire receiving channel and terminating to define a wire passing space between them and a wire restraining space below them; the tab means being effective to resiliently permit passage through the wire passing space of a wire having a diameter greater than the wire passing space. moved transversely of its axis, and to restrain movement out of the channel of a wire inserted into the wire restraining space;
  • protuberances in each of the sides extending into the wire receiving channel adjacently behind and toward the tab means in order to limit their outward movement relative to the sides.
  • the contact element of claim 12 further comprising slots in the sides separating the strain relief means from the termination means.
US443730A 1974-02-19 1974-02-19 Strain relief Expired - Lifetime US3902154A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US443730A US3902154A (en) 1974-02-19 1974-02-19 Strain relief
GB48672/74A GB1490198A (en) 1974-02-19 1974-11-11 Electrical termination system
SE7414500A SE7414500L (ja) 1974-02-19 1974-11-19
CA214,229A CA1027199A (en) 1974-02-19 1974-11-20 Termination system incorporating a strain relief for an electrical contact
FR7439074A FR2261631A1 (ja) 1974-02-19 1974-11-28
NL7415565A NL7415565A (nl) 1974-02-19 1974-11-29 Spanningontlastorgaan.
BE151018A BE822788A (fr) 1974-02-19 1974-11-29 Dispositif de branchement de fils comprenant un dispositif de stabilisation
IT30005/74A IT1026656B (it) 1974-02-19 1974-11-29 Mezzi di scarico delle sollecitazioni
DK629174A DK629174A (ja) 1974-02-19 1974-12-03
JP49137841A JPS50114593A (ja) 1974-02-19 1974-12-03
DE2456977A DE2456977C3 (de) 1974-02-19 1974-12-03 Verbinder für eine Anzahl von einzelnen isolierten Leitern
NO744355A NO744355L (ja) 1974-02-19 1974-12-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US443730A US3902154A (en) 1974-02-19 1974-02-19 Strain relief

Publications (1)

Publication Number Publication Date
US3902154A true US3902154A (en) 1975-08-26

Family

ID=23761961

Family Applications (1)

Application Number Title Priority Date Filing Date
US443730A Expired - Lifetime US3902154A (en) 1974-02-19 1974-02-19 Strain relief

Country Status (12)

Country Link
US (1) US3902154A (ja)
JP (1) JPS50114593A (ja)
BE (1) BE822788A (ja)
CA (1) CA1027199A (ja)
DE (1) DE2456977C3 (ja)
DK (1) DK629174A (ja)
FR (1) FR2261631A1 (ja)
GB (1) GB1490198A (ja)
IT (1) IT1026656B (ja)
NL (1) NL7415565A (ja)
NO (1) NO744355L (ja)
SE (1) SE7414500L (ja)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993391A (en) * 1975-09-19 1976-11-23 Itt Industries, Inc. Electrical contact for stripless cable connections
US4159156A (en) * 1976-10-07 1979-06-26 Bunker Ramo Corporation Crimped, insulation-pierce electrical connection and method and apparatus for making the connection
US4168876A (en) * 1978-02-27 1979-09-25 Western Electric Company, Inc. Electrical connector structures for facilitated solder attachment of flat conductors
US4208083A (en) * 1977-03-04 1980-06-17 Trw Inc. Solderless electrical connector
US4264118A (en) * 1978-04-17 1981-04-28 Bunker Ramo Corporation Insulation-pierce and crimp termination and method for effecting same
US4288918A (en) * 1976-10-07 1981-09-15 Bunker Ramo Corporation Method and apparatus for making a crimped, insulation-pierce electrical connection
US4291935A (en) * 1978-03-31 1981-09-29 Socapex Self-stripping contact element for a connector
US4373769A (en) * 1975-08-20 1983-02-15 Allied Corporation Electrical connector including insulation-opening contact
US4392701A (en) * 1980-07-16 1983-07-12 Amp Incorporated Tap connector assembly
WO1983002688A1 (en) * 1982-02-02 1983-08-04 Derek Hayes Electrical coupling device
US4480385A (en) * 1979-10-11 1984-11-06 Allied Corporation Tool and method for terminating electrical conductors in contact members
US4648679A (en) * 1985-11-15 1987-03-10 Allied Corporation Connector assembly for mass termination
US5314351A (en) * 1992-02-25 1994-05-24 Yazaki Corporation Pressure connection terminal
EP1168502A1 (en) * 2000-06-28 2002-01-02 Sumitomo Wiring Systems, Ltd. An insulation-displacement terminal fitting
US6354863B2 (en) * 1999-12-17 2002-03-12 Sumitomo Wiring Systems, Ltd. Insulation-displacement terminal fitting and a production method therefor
US6413116B2 (en) * 1998-08-07 2002-07-02 Entrelec S.A. Insulation-displacement connection piece
US6435899B2 (en) * 2000-02-21 2002-08-20 Sumitomo Wiring Systems, Ltd. Insulation-displacement terminal fitting and production method therefor
US6475018B1 (en) * 2001-05-29 2002-11-05 Yea Yen Huang Terminal for assembling wires of different diameters
US20100304601A1 (en) * 2009-05-26 2010-12-02 Compal Electronics, Inc. Electrical connector and terminal-connecting element thereof

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2436510A2 (fr) * 1978-01-23 1980-04-11 Nozick Jacques Element de contact electrique a connexion auto-denudante
FR2415374A1 (fr) * 1978-01-23 1979-08-17 Nozick Jacques Element de contact electrique a connexion auto-denudante
FR2459581A2 (fr) * 1979-04-10 1981-01-09 Cit Alcatel Connecteur electrique autodenudant pour fil ou cable
FR2461374A2 (fr) * 1979-07-12 1981-01-30 Cit Alcatel Connecteur electrique autodenudant pour fil ou cable
JPS6057066U (ja) * 1983-09-28 1985-04-20 日本端子株式会社 電気接続子
DE3912273A1 (de) * 1989-04-14 1990-10-18 Minnesota Mining & Mfg Verbinder fuer isolierte leiter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668279A (en) * 1950-06-17 1954-02-02 Epstein Hirsch Electrical conductor terminal with strain relieving means
US3824530A (en) * 1972-12-05 1974-07-16 Amp Inc Installation of electrical connectors on wires intermediate the ends thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243757A (en) * 1964-01-20 1966-03-29 Amp Inc Electrical connections
DE1996081U (de) * 1968-03-01 1968-11-07 Siemens Ag Klemmelement zum anschluss isolierter elektrischer leiter.
FR1596623A (ja) * 1968-10-16 1970-06-22
US3760331A (en) * 1969-03-14 1973-09-18 Amp Inc Electrical connecting device for insulated wires
DE2023171B1 (de) * 1970-05-12 1971-08-26 Krone Kg Elektrische Klemmanschlussverbindung
DE7212035U (de) * 1972-03-29 1972-06-29 Siemens Ag Klemmelement zum abisolierfreien Anschluß elektrischer Leiter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668279A (en) * 1950-06-17 1954-02-02 Epstein Hirsch Electrical conductor terminal with strain relieving means
US3824530A (en) * 1972-12-05 1974-07-16 Amp Inc Installation of electrical connectors on wires intermediate the ends thereof

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373769A (en) * 1975-08-20 1983-02-15 Allied Corporation Electrical connector including insulation-opening contact
US3993391A (en) * 1975-09-19 1976-11-23 Itt Industries, Inc. Electrical contact for stripless cable connections
US4159156A (en) * 1976-10-07 1979-06-26 Bunker Ramo Corporation Crimped, insulation-pierce electrical connection and method and apparatus for making the connection
US4288918A (en) * 1976-10-07 1981-09-15 Bunker Ramo Corporation Method and apparatus for making a crimped, insulation-pierce electrical connection
US4208083A (en) * 1977-03-04 1980-06-17 Trw Inc. Solderless electrical connector
US4168876A (en) * 1978-02-27 1979-09-25 Western Electric Company, Inc. Electrical connector structures for facilitated solder attachment of flat conductors
US4291935A (en) * 1978-03-31 1981-09-29 Socapex Self-stripping contact element for a connector
US4264118A (en) * 1978-04-17 1981-04-28 Bunker Ramo Corporation Insulation-pierce and crimp termination and method for effecting same
US4480385A (en) * 1979-10-11 1984-11-06 Allied Corporation Tool and method for terminating electrical conductors in contact members
US4392701A (en) * 1980-07-16 1983-07-12 Amp Incorporated Tap connector assembly
WO1983002688A1 (en) * 1982-02-02 1983-08-04 Derek Hayes Electrical coupling device
US4648679A (en) * 1985-11-15 1987-03-10 Allied Corporation Connector assembly for mass termination
US5314351A (en) * 1992-02-25 1994-05-24 Yazaki Corporation Pressure connection terminal
US6413116B2 (en) * 1998-08-07 2002-07-02 Entrelec S.A. Insulation-displacement connection piece
US6354863B2 (en) * 1999-12-17 2002-03-12 Sumitomo Wiring Systems, Ltd. Insulation-displacement terminal fitting and a production method therefor
US6435899B2 (en) * 2000-02-21 2002-08-20 Sumitomo Wiring Systems, Ltd. Insulation-displacement terminal fitting and production method therefor
EP1168502A1 (en) * 2000-06-28 2002-01-02 Sumitomo Wiring Systems, Ltd. An insulation-displacement terminal fitting
US6475018B1 (en) * 2001-05-29 2002-11-05 Yea Yen Huang Terminal for assembling wires of different diameters
US20100304601A1 (en) * 2009-05-26 2010-12-02 Compal Electronics, Inc. Electrical connector and terminal-connecting element thereof

Also Published As

Publication number Publication date
SE7414500L (ja) 1975-08-20
FR2261631A1 (ja) 1975-09-12
JPS50114593A (ja) 1975-09-08
IT1026656B (it) 1978-10-20
NL7415565A (nl) 1975-08-21
NO744355L (ja) 1975-08-20
DE2456977C3 (de) 1983-03-17
CA1027199A (en) 1978-02-28
DE2456977B2 (de) 1978-06-15
GB1490198A (en) 1977-10-26
DK629174A (ja) 1975-10-27
BE822788A (fr) 1975-03-14
DE2456977A1 (de) 1975-08-28

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AS Assignment

Owner name: LABINAL COMPONENTS AND SYSTEMS, INC., A DE CORP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TRW INC., A CORP. OF OH;REEL/FRAME:004853/0501

Effective date: 19871224

STCF Information on status: patent grant

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