WO1996033523A1 - Contact autodenudant avec soulagement de tension - Google Patents

Contact autodenudant avec soulagement de tension Download PDF

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Publication number
WO1996033523A1
WO1996033523A1 PCT/US1996/005041 US9605041W WO9633523A1 WO 1996033523 A1 WO1996033523 A1 WO 1996033523A1 US 9605041 W US9605041 W US 9605041W WO 9633523 A1 WO9633523 A1 WO 9633523A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
section
housing
conductor
strain relief
Prior art date
Application number
PCT/US1996/005041
Other languages
English (en)
Inventor
John M. Myer
Original Assignee
The Whitaker Corporation
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
Priority claimed from US08/426,308 external-priority patent/US5624273A/en
Application filed by The Whitaker Corporation filed Critical The Whitaker Corporation
Publication of WO1996033523A1 publication Critical patent/WO1996033523A1/fr

Links

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
    • 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
    • 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
    • H01R13/02—Contact members
    • H01R13/10—Sockets for co-operation with pins or blades
    • H01R13/11—Resilient sockets
    • 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
    • H01R13/40—Securing contact members in or to a base or case; Insulating of contact members
    • H01R13/42—Securing in a demountable manner
    • H01R13/428—Securing in a demountable manner by resilient locking means on the contact members; by locking means on resilient contact members
    • H01R13/434—Securing in a demountable manner by resilient locking means on the contact members; by locking means on resilient contact members by separate resilient locking means on contact member, e.g. retainer collar or ring around contact member
    • 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
    • H01R4/242—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 being plates having a single slot
    • H01R4/2425—Flat plates, e.g. multi-layered flat plates
    • H01R4/2429—Flat plates, e.g. multi-layered flat plates mounted in an insulating base
    • H01R4/2433—Flat plates, e.g. multi-layered flat plates mounted in an insulating base one part of the base being movable to push the cable into the slot

Definitions

  • the present invention relates to an electrical contact having a termination section for contact with a further electrical contact, and including an insulation displacement type (IDC) termination section for electrical termination with a conductor, whereby the conductor is relieved of strain adjacent the IDC section.
  • IDC insulation displacement type
  • Strain relief features of electrical connectors provide a means of isolating the electrical termination of a conductor with a termination section of a contact from the deleterious effects of forces acting on the conductor which would otherwise tend to reduce the contact normal force between the termination section and the conductor.
  • Such strain relief is particularly useful where an electrical termination is subject to harsh conditions, for example, the conditions associated with use in an automotive environment where vibration and/or tensile forces will be acting on the conductor. Strain relief members are designed to suppress these forces.
  • the electrical termination comprises an IDC-type termination, as compared to a crimp-type terminal, the IDC termination section must be carefully isolated from such forces.
  • strain relief techniques employ the use of plastic housing material adjacent to the contact to frictionally engage the conductor and thereby suppress vibration or tensile forces acting on the conductor.
  • Such use of the housing material for strain relief purposes has several disadvantages, for example: relaxation of the material may occur due to temperature cycling, resulting in a loosened strain relief section; strain induced breakage of the housing material; and the amount of material required to perform the strain relieving function consumes a considerable amount of space, thereby making the connector housing bulky.
  • US-A-4493523 A prior electrical connector which typifies the foregoing problems is disclosed in US-A-4493523.
  • This conventional device comprises a housing of insulating material adapted to accommodate an electrical terminal, and includes a plastic strain relief member integral with the housing which is adapted to frictionally engage the wire terminated to the terminal.
  • the strain relief member is subject to relaxation due to temperature cycling; strain induced breakage of the housing material; and the amount of material required to perform the strain relieving function, and the space required to allow deflection of the strain relief member, consume a considerable amount of space, thereby making the connector housing bulky.
  • the present invention overcomes the foregoing problems by providing an electrical contact having a termination section for contact with a further electrical contact, an IDC termination section for electrical termination with a conductor, the conductor is relieved of strain adjacent the IDC section, and the contact advantageously includes an integral strain relief section extending therefrom for strain relieving engagement with the conductor.
  • This integral contact section as compared to the above-mentioned use of the housing material, is not subject to a high degree of temperature relaxation, is mechanically strong, and is compact. More particularly, the integral strain relief section comprises a stamped metal extension of the contact.
  • the strain relief section includes a wire gripping portion and a flexible bend, the wire gripping portion is rotatable about the flexible bend for strain relieving engagement with the conductor.
  • the strain relief section includes an overstress leg for delimiting the rotation of the wire gripping portion.
  • the termination section includes a deflectable stop member which extends generally transversely of an edge of the termination section, and generally transversely of a shoulder of the housing, whereby the edge and the shoulder are advantageously aligned to apply shear forces to the stop member in retaining the contact in the housing.
  • Pig. 1 shows an isometric view of the electrical contact according to the present invention.
  • Fig. 2 shows a top view of the electrical contact of Fig. 1.
  • Fig. 3 shows a side cross sectional view of the electrical contact of Fig. 2 taken along line 3-3.
  • Fig. 4 shows a front elevational view of the electrical contact of Fig. 1.
  • Fig. 5 shows an isometric view of a second embodiment of the present invention.
  • Fig. 6 shows a cross sectional view of an electrical connector assembly according to the present invention.
  • Fig. 7 shows a cross sectional view of a second embodiment of an electrical connector assembly according to the present invention.
  • Fig. 1 shows an electrical contact 10 having a contact section 20, an IDC section 30, and a strain relief section 40.
  • Contact section 20 includes: a base portion 22 with overstress 22a; walls 24 having edges 24a and shoulders 24b with one wall 24 having a hole 21 formed therein; an inner top portion 25 with a locking tab 25a; a resilient leg 26 for engaging a further electrical component (e.g. a tab or pin contact) ; a resiliently deflectable stop member 27 with bends 27a, a stop leg 27b, and a plate 27c; an edge 28b and an outer top portion 28 having a tab aperture 28a for receiving locking tab 25a; and a resilient off-set portion 29 formed on the bottom of contact section 20 for connection to an electrical connector housing.
  • a further electrical component e.g. a tab or pin contact
  • IDC section 30 includes a base portion 32 with upstanding walls 34 formed thereon, which walls include IDC blades 36 for receiving, stripping the insulation from a portion of, and terminating an electrical conductor. Stiffening gussets 33 are formed between base section 32 and walls 34 for increasing the contact force generated by the walls 34. Additionally, IDC section 30 includes a boot 38 for uplifting and supporting the wire to be terminated to a more centralized and contact force maintaining location between blades 36.
  • Strain relief section 40 includes a base portion 42 with a bend 44 extending therefrom. Bend 44 is connected to an intermediate portion 45, and intermediate portion 45 is connected to a generally arcuate wire gripping portion 46.
  • the radius of bend 44 is advantageously greater than the radius of bend 46 for flexibility of intermediate portion 45 and portion 46 about bend 44, but it is contemplated that other radii may be used.
  • Wire gripping portion 46 includes serrations 46a for engaging a wire, as will be described below.
  • Strain relief section 40 further includes an overstress leg 48 having an edge 48a for engagement with base portion 42 when and if edge 48a is deflected that far. Strain relief section 40 comprises three angles: angle ⁇ , defined by base portion 42 and intermediate portion 45; angle ⁇ , defined by intermediate portion 45 and overstress leg 48; and angle ⁇ , defined by base portion 42 and overstress leg 48.
  • FIG. 2 a top view of the electrical contact 10 of Fig. 1 is shown. This view shows locking tab 25a of inner top portion 25 protruding through tab aperture 28a of outer top portion 28 thereby effectively interlocking inner top portion 25 to outer top portion 28. Additionally, boot 38 is shown laterally aligned with blades 36 of IDC section 30 for uplifting a wire to be terminated in the IDC section 30.
  • Fig. 3 a cross sectional view of the electrical contact of Fig. 1 taken along line 3-3 of Fig. 2 is shown.
  • Fig. 3 provides a good view of overstress stop 23 of contact section 20, which stop is aligned for engagement with resilient leg 26 when a tab or pin contact is inserted into the contact section 20.
  • Stop 23 will, if necessary, engage the end of resilient leg 26 thereby preventing overstress of the resilient leg 26.
  • Fig. 3 also shows: bends 27a of stop member 27; plate 27c aligned for engagement with edge 28b of outer top portion 28, as will be further described below; offset portion 29 which is formed into base portion 22; edges 24a of wall 24; overstress 22a for preventing overstress of stop member 27; and angles ⁇ , ⁇ , and ⁇ .
  • a front elevational view of the contact 10 is shown depicting the various parts of contact section 20.
  • Fig. 5 shows a second embodiment 10' of the present invention.
  • Electrical contact 10' includes a contact section 20, an IDC section 30, and a strain relief section 40, which sections are similar or identical to that of electrical contact 10 as described above.
  • electrical contact 10' includes a "wrap around" strain relief member 50 comprising gripping tabs 54 and 55.
  • Tabs 54 and 55 are crimpable tabs adapted for crimpable engagement with the insulation of a wire to be terminated in the electrical contact 10' .
  • an electrical connector assembly 80 which includes a housing 60, a stuffer 70, and the electrical contact 10 having a wire terminated therein disposed within the housing 60 and stuffer 70.
  • Housing 60 includes a recess for receiving contact 10 and a shoulder 62 disposed adjacent to stop member 27 of contact section 20 when the stop member is disposed within an aperture 68 of housing 60.
  • a recess 64 is formed in a lower portion of housing 60 for accommodating offset portion 29 of contact section 20 when the contact 10 is disposed within the housing 60.
  • Stuffer 70 is hingeably attached to housing 60 by hinge 66, but it is contemplated that stuffer 70 can be formed as wholly separate from housing 60.
  • Stuffer 70 includes a front ram 72, a middle ram 73, a rear ram 74 with edge 74a and nose 74b, a frictional retention surface 76, and a wire guide 78.
  • assembly of the electrical contact assembly 10 is accomplished by inserting electrical contact 10 into housing 60 so that offset portion 29 of contact section 20 registers with recess 64, and stop leg 27 is located adjacent to shoulder 62.
  • a wire 12 is then placed over the IDC walls 34 in axial alignment with blades 36 of IDC section 30.
  • cover 70 is rotated about hinge 66, and rams 72-74 pressingly engage wire 12, thereby stuffing wire 12 into electrical engagement with IDC section 30 between walls 34 and blades 36 thereof.
  • front ram 72 engages a front surface of wire 12
  • middle ram 73 engages a portion of the wire 12 within IDC section 30, and edge 74a of rear ram 74 engages an axially opposing surface of wire 12.
  • nose 74b which downwardly protrudes from rear ram 74, pushes a respective portion of wire 12 into engagement base portion 42.
  • Boot 38 maintains a centerline of wire 12 relatively higher than a centerline of the respective portion of wire 12 adjacent to nose 74b.
  • wire 12 is poised for frictional engagement with serrations 46a of wire gripping portion 46 and overstress leg 48 of strain relief section 40, and is arranged for frictional engagement with retention surface 76 of stuffer 70.
  • wire 12 comprises a series of contortious bends, and thereby is conformed to a torturous path within assembly 80.
  • a tensile force vector F when it is applied to wire 12, will cause strain relief section 40 to deflect, resulting in an increase in angle ⁇ (see Fig. 3) , and thereby defining an eccentric arc ⁇ as shown in the drawing.
  • the effective distance between wire gripping portion 46 and retention section surface 76 will decrease. The decrease in distance will result in a squeezing effect, i.e. a greater magnitude in gripping force will be applied to the wire 12 by retention surface 76 of stuffer 70 and wire gripping portion 46.
  • the tensile force F acting on the wire terminated in the IDC is converted to use in increasing the frictional retention forces which tend to resist the tensile forces, thereby creating a "Chinese finger” effect, and which conversion prevents the transmission of tensile forces to the contact termination section 30.
  • the tensile force transmitted to wire 12 by force vector F will cause a force to be applied generally to contact 10.
  • bend 44 of strain relief section 40 will not abut the housing 60 but, rather, the force transmitted to electrical contact 10 will be borne by edges 24a and shoulders 24b of walls 24 of contact section 20, which edges and shoulders engage a portion of front ram 72 of stuffer 70, and bend 44 may bear against wire guide 78.
  • wire 12 is more firmly gripped between wire gripping portion 46 and retention surface 76, no forces will be transmitted to the IDC section 30, thereby advantageously preserving the electrical continuity between walls 34 of IDC section 30 and the conductive core inside wire 12.
  • any force vector F which tends to separate the contact 10 from housing 60 will result in a shearing force being applied to stop member 27.
  • Force vector F will tend to shift electrical contact 10 relatively to the right as shown in Fig. 6 (with the housing 60 remaining stationery) .
  • Stop leg 27b of stop member 27 will thus engage shoulder 62 of housing 60.
  • stop member 27 will be resiliently deflected towards and will forcibly engage edge 28b of outer top portion 28 of contact section 20.
  • a shearing force is imparted to stop member 27 by engagement of edge 28b with stop member 27 on a lower side, and the shoulder 62 of housing 60 engaging stop member 27 on an upper side.
  • assembly 80' essentially incorporates electrical contact 10' into housing 60 with a stuffer 70 similar to the embodiment of Fig. 6.
  • the rear ram 74 has been modified to a rear ram 74' with a truncated lower surface.
  • Truncating the lower surf ce of rear ram 74' creates space for wrap around strain relief member 50 with gripping tabs 54 and 55 for firmly capturing the wire 12 thereby obviating the need for a further gripping portion such as, for example, the nose 74b of rear ram 74 of the embodiment of Fig. 6.
  • stuffer 70 is shown hinged to housing 60 by a hinge 66, it is contemplated that stuffer 70 can be a wholly separate member.
  • receptacle contacts 10 and 10' have been disclosed, it is contemplated that the present invention can be adapted for use with any IDC contact including pin, tab, or other interconnection systems.
  • boot 38 can take the form of a mere tab.
  • the housing 60 and stuffer 70 can be modified to include a plurality of electrical contacts 10 and/or 10' for mass termination of a plurality of wires 12. It is also contemplated that the stuffer 70 can be modified to eliminate the middle ram 73 and still satisfactorily perform its wire stuffing function.
  • the ideal engineering materials for the electrical contacts disclosed above will comprise metals having high strength, high conductivity, and a low cost. For example, such metals as copper, brass, bronze, beryllium copper, copper alloys, steel, nickel, aluminum, and zinc. Additionally, it is preferred that the above described contacts comprise a stamped and formed contact. However, other methods may be used to form the contact as well. It is further desired that the electrical contacts will be coated or plated for corrosion resistance.
  • a coating comprising tin, tin low lead, tin lead, nickel, gold, silver, copper, zinc, or palladium. It is further contemplated that the electrical contacts will be plated by, for example, an electro-deposition process.
  • the housing 60 and stuffer 70 can be formed of any suitable dielectric plastic or other dielectric material.

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  • Connector Housings Or Holding Contact Members (AREA)

Abstract

Cette invention concerne un ensemble contact électrique (80) qui comporte un contact électrique (10) ayant une section de contact (20), une section autodénudante (30) et une section de soulagement de tension (40) du fil. Le contact électrique (10) est placé dans un boîtier diélectrique (60) pourvu d'un élément rotatif d'aide au bourrage (70) qui sert à pousser le fil (12) et à le faire entrer en contact avec la section autodénudante (30). Le vecteur de force F est une force séparatrice qui sert à provoquer la déviation de la section de soulagement de tension (40) qui, de ce fait, assure une prise plus ferme du fil (12) entre une partie de serrage de maintien (46) et une surface de maintien (76) de l'élément d'aide au bourrage (70). Toute force séparatrice provoque l'entrée en contact d'un élément d'arrêt (27) de la section de contact (20) avec l'épaulement (62) du boîtier (60), ce qui produit une action de cisaillement lors de l'entrée en contact d'un bord (28b) avec l'élément d'arrêt (27).
PCT/US1996/005041 1995-04-21 1996-04-11 Contact autodenudant avec soulagement de tension WO1996033523A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US42632895A 1995-04-21 1995-04-21
US08/426,328 1995-04-21
US08/426,308 US5624273A (en) 1995-04-21 1995-04-21 Insulation displacement contact with strain relief
US08/426,308 1995-04-21

Publications (1)

Publication Number Publication Date
WO1996033523A1 true WO1996033523A1 (fr) 1996-10-24

Family

ID=27027004

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/005041 WO1996033523A1 (fr) 1995-04-21 1996-04-11 Contact autodenudant avec soulagement de tension

Country Status (1)

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WO (1) WO1996033523A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851534A2 (fr) * 1996-12-26 1998-07-01 Yazaki Corporation Borne de connexion à pression
GB2321562A (en) * 1997-01-09 1998-07-29 Yazaki Corp Ultrasonic welding terminal and joint
EP1801916A1 (fr) 2003-05-20 2007-06-27 Saip & Schyller S.P.A. Corps d'une unité de support de contact pour support/prise de connexion électrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4344665A (en) * 1980-10-31 1982-08-17 Amp Incorporated Connector for mass terminating individual conductors
US4493523A (en) * 1983-10-18 1985-01-15 Challenger Circle F, Inc. Adaptive strain relief for wiring devices
DE8615615U1 (de) * 1986-06-10 1986-07-31 Grote & Hartmann Gmbh & Co Kg, 5600 Wuppertal Kontakt mit Schneidklemmanschluß
EP0433625A1 (fr) * 1989-12-21 1991-06-26 Telenorma Gmbh Douille de contact élastique pour connexion enfichable de brins de câbles et de fils électriques
JPH06111860A (ja) * 1992-09-25 1994-04-22 Yazaki Corp 圧接端子及び該端子を用いたコネクタ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4344665A (en) * 1980-10-31 1982-08-17 Amp Incorporated Connector for mass terminating individual conductors
US4493523A (en) * 1983-10-18 1985-01-15 Challenger Circle F, Inc. Adaptive strain relief for wiring devices
DE8615615U1 (de) * 1986-06-10 1986-07-31 Grote & Hartmann Gmbh & Co Kg, 5600 Wuppertal Kontakt mit Schneidklemmanschluß
EP0433625A1 (fr) * 1989-12-21 1991-06-26 Telenorma Gmbh Douille de contact élastique pour connexion enfichable de brins de câbles et de fils électriques
JPH06111860A (ja) * 1992-09-25 1994-04-22 Yazaki Corp 圧接端子及び該端子を用いたコネクタ
US5427544A (en) * 1992-09-25 1995-06-27 Yazaki Corporation Press-connecting terminal and connector using same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851534A2 (fr) * 1996-12-26 1998-07-01 Yazaki Corporation Borne de connexion à pression
EP0851534A3 (fr) * 1996-12-26 1999-06-16 Yazaki Corporation Borne de connexion à pression
US5964612A (en) * 1996-12-26 1999-10-12 Yazaki Corporation Pressure connecting terminal
GB2321562A (en) * 1997-01-09 1998-07-29 Yazaki Corp Ultrasonic welding terminal and joint
GB2321562B (en) * 1997-01-09 1999-08-04 Yazaki Corp Ultrasonic welding terminal
US6099364A (en) * 1997-01-09 2000-08-08 Yazaki Corporation Ultrasonic welding terminal
EP1801916A1 (fr) 2003-05-20 2007-06-27 Saip & Schyller S.P.A. Corps d'une unité de support de contact pour support/prise de connexion électrique

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