EP0441803B1 - Electrical contact - Google Patents

Electrical contact Download PDF

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Publication number
EP0441803B1
EP0441803B1 EP89911421A EP89911421A EP0441803B1 EP 0441803 B1 EP0441803 B1 EP 0441803B1 EP 89911421 A EP89911421 A EP 89911421A EP 89911421 A EP89911421 A EP 89911421A EP 0441803 B1 EP0441803 B1 EP 0441803B1
Authority
EP
European Patent Office
Prior art keywords
wire
section
contact
electrical
side plates
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
EP89911421A
Other languages
German (de)
French (fr)
Other versions
EP0441803A1 (en
Inventor
Nobuaki Onoue
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.)
Whitaker LLC
Original Assignee
Whitaker LLC
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 Whitaker LLC filed Critical Whitaker LLC
Publication of EP0441803A1 publication Critical patent/EP0441803A1/en
Application granted granted Critical
Publication of EP0441803B1 publication Critical patent/EP0441803B1/en
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
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/51—Fixed connections for rigid printed circuits or like structures
    • H01R12/55—Fixed connections for rigid printed circuits or like structures characterised by the terminals
    • H01R12/58—Fixed connections for rigid printed circuits or like structures characterised by the terminals terminals for insertion into holes
    • H01R12/585—Terminals having a press fit or a compliant portion and a shank passing through a hole in the printed circuit board
    • 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
    • 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

Definitions

  • This invention relates to an electrical contact, more specifically to a contact for electrically connecting an electrical wire to a printed circuit board, according to the preamble of claim 1.
  • an electrical contact In conventional technology to electrically connect an electrical wire to a printed circuit board, an electrical contact is used which is to be soldered after having a contact section inserted into a through-hole of such circuit board.
  • Such type of electrical contact is made of a metal plate by a stamping and forming technique and comprises a holding section for holding the contact in a dielectric housing, an insertion or contact section to be inserted in a through-hole in a circuit board, and a wire-connection section as part of the holding section.
  • An electrical contact of this type is disclosed in EP-A- 0 082 697.
  • such electrical contact is normally soldered when the contact section is inserted in a through-hole in a circuit board. It is inherent that soldering heat is conducted to the wire-connection section, thereby softening or melting the insulation covering the electrical wire connected to the wire-connection section of the electrical contact. This may result in reducing the force to hold the stranded conductors cf the electrical wire to such an extent that the conductors are unstably or improperly connected to the wire-connection section of the electrical contact.
  • such conventional electrical contact has no effective means to overcome such problem.
  • the wire-connection section of such electrical contact may be made from a part of the bottom plate by a stamping and forming technique.
  • the wire-connection section is preferably designed to have a slot for an insulation-displacement connection of an electrical wire therein.
  • the present contact is particularly useful for such contact.
  • the thermal-insulation holes are in communication with the projection-receiving holes to dissipate heat conduction to the wire-connection section.
  • the electrical contact of the present invention as constructed above is soldered after inserting the contact section into a through-hole of a printed circuit board.
  • the heat generated by the soldering operation is effectively dissipated when conducted through the contact section and the holding section to the wire-connection section by the thermal-insulation holes. Consequently, heat conduction to the electrical wire electrically connected in the insulation-displacement slot is effectively dissipated.
  • FR-A- 1 426 290 It is known from FR-A- 1 426 290 to provide an electrical contact with a hole for reducing the thermal conductivity along the contact to prevent solder soldering the contact to a printed circuit board from unsoldering during soldering of an electric conductor to the electrical contact.
  • FIG. 1 is a perspective view of one embodiment of the electrical contact.
  • FIG. 2 is a side elevational view of the electrical contact in FIG. 1
  • FIG. 3 is a top plan view of the electrical contact in FIG. 1.
  • FIG. 4 is a rear elevational view of the electrical contact in FIG. 1.
  • FIG. 5 is a cross-sectional view of the electrical contact along the line 5-5 in FIG. 2 to illustrate an electrical wire connected in the insulation-displacement slot along with the wire insulation being shown by phantom lines.
  • FIG. 6 is a part side view of another embodiment of the electrical contact showing a thermal-dissipating hole.
  • FIG. 7 is a top plan view of a dielectric housing in which the electrical contacts according to this invention are secured.
  • FIG. 8 is an end view of FIG. 7.
  • a contact 1 is made of a metal plate by conventional stamping and forming practices.
  • the contact 1 comprises a holding section 2 for holding the contact in a dielectric housing (see FIG. 7), an insertion or contact section 3 to be inserted into a through-hole in a printed circuit board, and a wire-connection section 4 located in the holding section 2.
  • the holding section 2 is made of a bottom plate 5 bent to form opposed side plates 6 at both side edges thereof.
  • the insertion or contact section 3 is made of a pair of resilient strips or legs 7 extending outwardly from the center portion of the side plates 6.
  • the wire-connection section 4 is formed by upwardly bending a part 5a of the bottom plate 5 and is located between side plates 6.
  • the holding section 2 comprises projection-receiving holes 8 at substantially a center portion of the side plates 6 and thermal-insulation holes 9 are in communication with the holes 8.
  • Engaging projections 10 are formed on both outer surfaces of the side plates 6 adjacent to the base portions of the strips or legs 7 for engaging side surfaces of a housing cavity to hold the contact therein.
  • a pair of wire-holding members 12 are bent inwardly from side plates 6 across bottom plate 5 leaving a gap 11 therebetween.
  • Wire-pressing projections 13 extend inwardly in side plates 6 adjacent the bottom plate 5.
  • the insertion or contact section 3 has staggered stepped portions 14 at substantially center portions of the strips or legs 7 and reenforcing projections 15 extending from the base portions toward the outer ends 16 of the strips 7. Also, an outer end 16 of one strip 7 is hooked over outer end 16 of the other strip 7.
  • the wire-connection section 4 has a wire-connection slot 17 in part 5a at the center portion thereof and projections 18 at both side edges that are disposed in the projection-receiving holes 8.
  • thermal-insulation holes 9′ of the alternative embodiment extend in the longitudinal direction of the contact 1 and are symmetrical, thereby enhancing the thermal-dissipating efficiency.
  • a plurality of contacts 1 are secured in cavities 21 in a housing 20 made of any suitable insulation material such as plastic.
  • Each contact 1 is secured in a respective cavity 21 by inserting the holding section 2 therein so that at least the engaging projections 10 engage with the side surfaces of the cavity.
  • the insertion or contact section 3 extend outwardly from a bottom surface of the housing 20.
  • an electrical wire 30 is electrically connected to each contact 1 of the aforementioned construction. More in detail, the wire 30 is pressed into the slot 17 of the wire-connection section 4 by way of tapered sections 17a at the upper portion for insulation displacement connection. That is, the inner edges of the slot 17 of the wire-connection section 4 penetrate the insulation 31 for electrically connecting the core conductors 32 to the slot edges 17 and the insulation 31 at a slight distance from the insulation displacement connected position of the electrical wire is held in the gap 11 between wire-holding members 12.
  • the contact sections 3 of the electrical contacts 1 electrically connected to respective electrical wires 30 via sections 4 are inserted into through-holes (not shown) in a printed circuit board 40 as shown in FIG. 7 by phantom lines.
  • thermal-insulation holes in the side plates forming the holding section and the wire-connection section exhibit good thermal-dissipation characteristics when the contact is soldered, thereby preventing the insulation of the electrical wire connected to the wire-connection section from softening or melting causing loss of connection force of the stranded wire conductors. Consequently, the unstable or improper electrical connection problem of the conventional electrical contact is effectively solved.
  • This invention is particularly effective to simplify electrical connection is such an instance where the wire-connection section has an insulation-displacement connection slot for making electrical connection of an electrical wire in such slot.
  • thermal-dissipating efficiency to the connected wire is significant because the thermal-insulation holes are formed in a continuous manner with the projection-receiving holes in the side plates of the holding section which receive the projections of the wire-connection section.

Landscapes

  • Multi-Conductor Connections (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Abstract

An electrical contact comprising a holding section (2) formed of opposing side plates (6) bent from a bottom plate (5), a contact section (3) extending outwardly from the holding section (2) for electrical connection with a circuit board, a wire-connection section (4) between the side plates (6) for electrical connection to an insulated electrical wire (30), projections (18) at the sides of the wire-connection section (4) disposed in projection-receiving holes (8) in the side plates (6), and the side plates (6) having thermal-insulation holes (9, 9') adjacent the projection-receiving holes (8) to dissipate heat conducted along the contact section (3) and holding section (2) when the contact section (3) is soldered to the circuit board to obviate the melting or softening of the insulation of the electrical wire (30) in the wire-connection section (4).

Description

  • This invention relates to an electrical contact, more specifically to a contact for electrically connecting an electrical wire to a printed circuit board, according to the preamble of claim 1.
  • In conventional technology to electrically connect an electrical wire to a printed circuit board, an electrical contact is used which is to be soldered after having a contact section inserted into a through-hole of such circuit board.
  • Such type of electrical contact is made of a metal plate by a stamping and forming technique and comprises a holding section for holding the contact in a dielectric housing, an insertion or contact section to be inserted in a through-hole in a circuit board, and a wire-connection section as part of the holding section. An electrical contact of this type is disclosed in EP-A- 0 082 697.
  • As mentioned above, such electrical contact is normally soldered when the contact section is inserted in a through-hole in a circuit board. It is inherent that soldering heat is conducted to the wire-connection section, thereby softening or melting the insulation covering the electrical wire connected to the wire-connection section of the electrical contact. This may result in reducing the force to hold the stranded conductors cf the electrical wire to such an extent that the conductors are unstably or improperly connected to the wire-connection section of the electrical contact. However, such conventional electrical contact has no effective means to overcome such problem.
  • It is, therefore, an object of this invention to provide an electrical contact effectively solving the problem encountered in the conventional electrical contact.
  • The above problem is solved by an electrical contact as defined in claim 1.
  • The wire-connection section of such electrical contact may be made from a part of the bottom plate by a stamping and forming technique.
  • In any mode, the wire-connection section is preferably designed to have a slot for an insulation-displacement connection of an electrical wire therein. The present contact is particularly useful for such contact.
  • According to the present contact, the thermal-insulation holes are in communication with the projection-receiving holes to dissipate heat conduction to the wire-connection section.
  • The electrical contact of the present invention as constructed above is soldered after inserting the contact section into a through-hole of a printed circuit board. The heat generated by the soldering operation is effectively dissipated when conducted through the contact section and the holding section to the wire-connection section by the thermal-insulation holes. Consequently, heat conduction to the electrical wire electrically connected in the insulation-displacement slot is effectively dissipated.
  • It is known from FR-A- 1 426 290 to provide an electrical contact with a hole for reducing the thermal conductivity along the contact to prevent solder soldering the contact to a printed circuit board from unsoldering during soldering of an electric conductor to the electrical contact.
  • The electrical contact according to the present invention is described in detail hereunder by way of example with reference to the following description in conjunction with the accompanying drawings.
  • FIG. 1 is a perspective view of one embodiment of the electrical contact.
  • FIG. 2 is a side elevational view of the electrical contact in FIG. 1
  • FIG. 3 is a top plan view of the electrical contact in FIG. 1.
  • FIG. 4 is a rear elevational view of the electrical contact in FIG. 1.
  • FIG. 5 is a cross-sectional view of the electrical contact along the line 5-5 in FIG. 2 to illustrate an electrical wire connected in the insulation-displacement slot along with the wire insulation being shown by phantom lines.
  • FIG. 6 is a part side view of another embodiment of the electrical contact showing a thermal-dissipating hole.
  • FIG. 7 is a top plan view of a dielectric housing in which the electrical contacts according to this invention are secured.
  • FIG. 8 is an end view of FIG. 7.
  • As shown in FIGS. 1 through 6, a contact 1 is made of a metal plate by conventional stamping and forming practices. The contact 1 comprises a holding section 2 for holding the contact in a dielectric housing (see FIG. 7), an insertion or contact section 3 to be inserted into a through-hole in a printed circuit board, and a wire-connection section 4 located in the holding section 2. The holding section 2 is made of a bottom plate 5 bent to form opposed side plates 6 at both side edges thereof. The insertion or contact section 3 is made of a pair of resilient strips or legs 7 extending outwardly from the center portion of the side plates 6. The wire-connection section 4 is formed by upwardly bending a part 5a of the bottom plate 5 and is located between side plates 6. The holding section 2 comprises projection-receiving holes 8 at substantially a center portion of the side plates 6 and thermal-insulation holes 9 are in communication with the holes 8. Engaging projections 10 are formed on both outer surfaces of the side plates 6 adjacent to the base portions of the strips or legs 7 for engaging side surfaces of a housing cavity to hold the contact therein. A pair of wire-holding members 12 are bent inwardly from side plates 6 across bottom plate 5 leaving a gap 11 therebetween. Wire-pressing projections 13 extend inwardly in side plates 6 adjacent the bottom plate 5.
  • The insertion or contact section 3 has staggered stepped portions 14 at substantially center portions of the strips or legs 7 and reenforcing projections 15 extending from the base portions toward the outer ends 16 of the strips 7. Also, an outer end 16 of one strip 7 is hooked over outer end 16 of the other strip 7. The wire-connection section 4 has a wire-connection slot 17 in part 5a at the center portion thereof and projections 18 at both side edges that are disposed in the projection-receiving holes 8.
  • Shown in FIG. 6 is another embodiment of the thermal-insulation holes 9. The thermal-insulation holes 9′ of the alternative embodiment extend in the longitudinal direction of the contact 1 and are symmetrical, thereby enhancing the thermal-dissipating efficiency.
  • As shown in FIGS. 7 and 8, a plurality of contacts 1 are secured in cavities 21 in a housing 20 made of any suitable insulation material such as plastic. Each contact 1 is secured in a respective cavity 21 by inserting the holding section 2 therein so that at least the engaging projections 10 engage with the side surfaces of the cavity. In the secured condition, the insertion or contact section 3 extend outwardly from a bottom surface of the housing 20.
  • As shown in FIGS. 5, 7 and 8, an electrical wire 30 is electrically connected to each contact 1 of the aforementioned construction. More in detail, the wire 30 is pressed into the slot 17 of the wire-connection section 4 by way of tapered sections 17a at the upper portion for insulation displacement connection. That is, the inner edges of the slot 17 of the wire-connection section 4 penetrate the insulation 31 for electrically connecting the core conductors 32 to the slot edges 17 and the insulation 31 at a slight distance from the insulation displacement connected position of the electrical wire is held in the gap 11 between wire-holding members 12. The contact sections 3 of the electrical contacts 1 electrically connected to respective electrical wires 30 via sections 4 are inserted into through-holes (not shown) in a printed circuit board 40 as shown in FIG. 7 by phantom lines.
  • According to the electrical contact of the present invention, thermal-insulation holes in the side plates forming the holding section and the wire-connection section exhibit good thermal-dissipation characteristics when the contact is soldered, thereby preventing the insulation of the electrical wire connected to the wire-connection section from softening or melting causing loss of connection force of the stranded wire conductors. Consequently, the unstable or improper electrical connection problem of the conventional electrical contact is effectively solved.
  • This invention is particularly effective to simplify electrical connection is such an instance where the wire-connection section has an insulation-displacement connection slot for making electrical connection of an electrical wire in such slot.
  • The thermal-dissipating efficiency to the connected wire is significant because the thermal-insulation holes are formed in a continuous manner with the projection-receiving holes in the side plates of the holding section which receive the projections of the wire-connection section.

Claims (4)

  1. An electrical contact comprising a holding section (2) formed of opposing side plates (6) bent from a bottom plate (5), a contact section (3) extending outwardly from said holding section (2) for electrical connection with a circuit board, a wire-connection section (4) between said side plates (6) for electrical connection to an insulated electrical wire (30) and projections (18) at the sides of said wire-connection section (4) disposed in projection-receiving holes (8) in said side plates (6), characterized in that said side plates (6) have thermal-insulation holes (9, 9′) adjacent said projection-receiving holes (8) to dissipate heat conducted along the contact section (3) and holding section (2) when the contact section (3) is soldered to the circuit board to obviate the melting or softening of the insulation of the electrical wire (30) in the wire-connection section (4) and wherein each of the thermal insulation holes (9, 9′) has an edge which is continous with an edge of one of the projection-receiving holes (8, 8′), whereby heat is dissipated.
  2. An electrical contact as claimed in claim 1, characterized in that the wire-connection section is a part (5a) of the bottom plate (5) and has a slot (17).
  3. An electrical contact as claimed in claim 1, characterized in that wire-holding members (12) are bent inwardly from said side plates (6) across said bottom plate (5) leaving a gap (11) therebetween.
  4. An electrical contact as claimed in claim 1, characterized in that said contact section (3) includes resilient legs (7) having staggered stepped portions (14).
EP89911421A 1988-11-11 1989-10-10 Electrical contact Expired - Lifetime EP0441803B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP147282/88U 1988-11-11
JP1988147282U JPH0548367Y2 (en) 1988-11-11 1988-11-11
PCT/US1989/004322 WO1990005392A1 (en) 1988-11-11 1989-10-10 Electrical contact

Publications (2)

Publication Number Publication Date
EP0441803A1 EP0441803A1 (en) 1991-08-21
EP0441803B1 true EP0441803B1 (en) 1995-03-29

Family

ID=15426682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89911421A Expired - Lifetime EP0441803B1 (en) 1988-11-11 1989-10-10 Electrical contact

Country Status (5)

Country Link
EP (1) EP0441803B1 (en)
JP (1) JPH0548367Y2 (en)
CN (1) CN1043043A (en)
DE (1) DE68921987T2 (en)
WO (1) WO1990005392A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2675953B1 (en) * 1991-04-26 1993-07-02 Entrelec Sa CONNECTION ARRANGEMENT FOR ELECTRIC WIRES AND CONNECTION PIECE FOR SUCH AN ARRANGEMENT.
US5252094A (en) * 1992-11-30 1993-10-12 Molex Incorporated Electrical connector with improved terminal retention
US5374204A (en) * 1993-11-30 1994-12-20 The Whitake Corporation Electrical terminal with compliant pin section
JPH10154535A (en) * 1996-11-26 1998-06-09 Sumitomo Wiring Syst Ltd Pressure contact type terminal metal fitting
DE19713152A1 (en) * 1997-03-27 1998-10-08 Whitaker Corp Electrical contact element
CN101572365B (en) * 2008-04-28 2011-10-05 富士康(昆山)电脑接插件有限公司 Cable connector component
DE102016107482A1 (en) 2016-04-22 2017-10-26 Phoenix Contact Gmbh & Co. Kg plug contact
DE102016118147B4 (en) 2016-09-26 2020-06-04 Lumberg Connect Gmbh Plug contact with insulation displacement fork
DE102018210237A1 (en) * 2018-06-22 2019-12-24 Würth Elektronik eiSos Gmbh & Co. KG Contact for direct connectors and direct connectors

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1160050B (en) * 1962-06-07 1963-12-27 Josef Eisert Device for connecting electrical conductors by soldering
FR1426290A (en) * 1964-12-15 1966-01-28 Radiotechnique Connection lug for electrical circuit carried by an insulating plate
JPS54103561U (en) * 1977-12-29 1979-07-21
JPS5894291U (en) * 1981-12-19 1983-06-25 日本圧着端子製造株式会社 IDC type electrical connector
JPH0323663Y2 (en) * 1985-04-25 1991-05-23

Also Published As

Publication number Publication date
DE68921987T2 (en) 1995-08-03
JPH0267566U (en) 1990-05-22
WO1990005392A1 (en) 1990-05-17
CN1043043A (en) 1990-06-13
DE68921987D1 (en) 1995-05-04
JPH0548367Y2 (en) 1993-12-24
EP0441803A1 (en) 1991-08-21

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