EP0105044B1 - Elektrischer Stift zum Gebrauch in gedruckten Schaltungsplatten - Google Patents

Elektrischer Stift zum Gebrauch in gedruckten Schaltungsplatten Download PDF

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Publication number
EP0105044B1
EP0105044B1 EP19830870089 EP83870089A EP0105044B1 EP 0105044 B1 EP0105044 B1 EP 0105044B1 EP 19830870089 EP19830870089 EP 19830870089 EP 83870089 A EP83870089 A EP 83870089A EP 0105044 B1 EP0105044 B1 EP 0105044B1
Authority
EP
European Patent Office
Prior art keywords
legs
pin
leg
contact pin
hole
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
Application number
EP19830870089
Other languages
English (en)
French (fr)
Other versions
EP0105044A1 (de
Inventor
Marcel Verbruggen
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.)
Burndy Electra NV
Original Assignee
Burndy Electra NV
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 BE0/208920A external-priority patent/BE894258A/nl
Application filed by Burndy Electra NV filed Critical Burndy Electra NV
Publication of EP0105044A1 publication Critical patent/EP0105044A1/de
Application granted granted Critical
Publication of EP0105044B1 publication Critical patent/EP0105044B1/de
Expired 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

Definitions

  • This invention relates to electrical terminal pins to be mounted through apertures of a base of a printed circuit board and which project from each side of the base board to serve as electrical terminal elements on which connectors may be plugged or to which wire leads may be wrapped (wire-wrap).
  • the mounting section of said pins is adapted to be resiliently deformed upon insertion such as shown for example in U.S. patent 3,783,433 issued on January 1st, 1974.
  • a split two- legged pin of that kind when inserted, normally takes an unsymmetrical cross-sectional shape which causes the pin to be twisted and possibly misaligned.
  • Pins also have been manufactured having three resilient legs such as described in U.S. patent 4,066,326 issued January 3, 1978 (equivalent to FR-A-2 287 827).
  • each leg or fin has a transverse width of about 1/3 of the square transverse cross-section of the pin.
  • the transverse width or thickness of the three fins is consequently identical.
  • outer legs are flared and diverge from one another to provide for uniform spacing of the contact areas of the legs with the hole (page 2, lines 32-34 and Figures 8, 9 and 14).
  • the legs present in this case a symmetrical configuration upon insertion of the pin in a hole of a printed board, only three contact points are obtained and the legs do not act on each other in order to obtain a permanent reaction force.
  • the purpose of the present invention is to develop an improved contact pin in which the amount of mechanical and electrical contact points is increased and in which the resilient legs are acting on each other in order to obtain a permanent reaction force upon insertion of the pin in a hole of a substrate.
  • Another purpose of the present invention is also to provide an improved contact pin which diminishes the stresses between each contact point and the inner wall of the hole in a printed circuit so as to obtain less damage corresponding to equal insertion forces.
  • Still another purpose of the invention is to provide a contact pin which is soldered in a printed circuit with or without addition of tin.
  • the present invention is characterized in that the central portion of the pin presents a configuration in which the outer edges of the two outer legs are lying on the locus of a circle centered on the longitudinal axis of the pin while the inner leg lies within said locus in such a manner that upon insertion of the pin in a circular hole, the edges extending outwardly of the outer legs come first into contact with the periphery of the hole creating a torque-moment in each contact point so that the outer legs are twisted and bent towards one another about the inner leg so as to obtain a configuration inclined to each other, the contact of the inner leg with the periphery of the hole, which due to said configuration occurs later on, producing a normal radial force towards the center of the pin so that the inner leg is displaced to engage by and between the two outer legs in the manner of a wedge.
  • the cross section of the outer legs is cut out so as to be less thick than the central leg to improve the bending towards each other while the extremities of the three legs remain connected with the body of the pin.
  • one extremity of the inner leg is cut-away from the pin-body.
  • the outer edges or surfaces of the resilient legs which realize the contact with the inner wall of the hole in the printed circuit, are provided with a controlled wave-shape configuration which creates a cold welding effect between the conductive tinlayers of the pin and the hole.
  • the electrical contact pin generally designated 10 consists of two outer sections 11, 12 for the connection of electrical components and a central or mounting section 13 adapted for securing the pin 10 into a circular aperture or hole 15 of a printed circuit board 14.
  • One of the ends of said central section 13 has an enlarged cross-sectional area thus forming a shoulder 16.
  • the pin 10 has two through cuts 17, 18 extending parallel to one another and parallel to the longitudinal axis of the pin thus forming three resilient leg portions 19, 20 and 21.
  • both outer legs 19 and 21 are bent in the same direction while the inner leg 20 is bent in opposite direction this giving a cross-section such as shown in figure 3, said cross-section being made along the line AA in figure 2.
  • both outer legs 19 and 21 are made smaller in cross-section than the central leg 20 to facilitate their twisting and bending towards one another about the central leg 20 upon insertion into the hole 15 (figure 6) so as to assume configuration in which they are inclined to each other with the inner leg 20 engaged by and between the two outer legs 19, 21 in the manner of a wedge.
  • This figure 6 shows clearly how six areas of contacts are obtained between the pin 10 and hole wall 15.
  • the central leg portion 20 has one end thereof cut away from the pinbody 10.
  • the outer edges or surfaces of the resilient legs which realize the contact with the inner wall of the hole in the printed circuit, may be provided with a controlled wave-shaped configuration 22 such as shown in figures 5, 9, 11 and 13.
  • the built up tin material will create after a while a so-called “cold welding" in the wave-shape configuration which will increase extraction force.
  • said pin is provided in two particular embodiments.
  • the mounting portion of the pin is covered with a thick tin-lead (5 to 10p) coating; in this case, the contact pins provided in a printed circuit board are soldered by addition of heat, with or without applying extra solder. Because of the large contact area between the pin and the hole, tin-lead material is peeled of during insertion and only the solder material on the free side walls of the pin and inner walls of the hole can reflow together during solder-process.
  • the thickness of the tin-lead coating on the mounting portion of the pins is less important (1 to 3p) so to obtain a dry connection with the holes in a printed circuit-board.
  • the burrs or peels produced during the insertion operation are smaller in this case than in the previous one, but they could be separated from the pin when shaking the panel and this could give rise to undesired short-circuitings.
  • the purpose of the embodiment of figures 13 and 14 is to prevent formation of said peeling and besides still to improve the solder connection between the layers of the pin and the hole of a printed circuit board.
  • this central portion is cut twice in 17 and 18 over a certain distance of its length in order to create three resiliently displacable legs 19, 20 and 21.
  • the outer side 30 of the central leg 20 is provided with a lengthwise and centrally disposed depression or groove 32.
  • said depression 32 in the outer side 30 of the pin causes a slight waving of the side walls, the strength of which is increased by local compression of material in the waved outer side 30 of central leg 20.
  • the side walls of the central leg 20 are conically shaped in 36 towards the inner side 34 in order to improve further the wedge like action of central leg 20 between the two outer legs 19, 21.
  • the optimum ratio has also been established between the width M of the central leg 20 and the width B of each of the outer legs 19, 21.
  • the value of this ratio should be mainly situated between 1,05 and 1,2 and should preferably be 1,13 with a pin material thickness D of 0,63 mm and an overall width of the mounting section of 1,05 mm.
  • the rounded outer edges R2 should have a larger radius than the rounded edges R1 disposed at the inner side of the outer legs.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Multi-Conductor Connections (AREA)

Claims (10)

1. Elektrischer Kontaktstift (10) für gedruckte Schaltungen mit einem zentralen Teil (13) zur federnden Stiftbefestigung in einem kreisförmigen Loch der gedruckten Schaltung, bei dem der zentrale Teil zur Bildung dreier federnder Schenkel (19,20,21) zwei Längsdurchschnitte (17, 18) aufweist, die äußern Schenkel (19, 21) in Richtung parallel zur Ebene der Schnitte gebogen sind und bei dem der innere Schenkel (20) in der Gegenrichtung gebogen ist, dadurch gekennzeichnet, daß der zentrale Teil (13) des Stiftes (10) eine Form besitzt, bei der die Außenränder der äußeren Schenkel (19,21) auf einem Ortskreis mit der Längsachse des Stiftes (10) als Mittelpunkt liegen, während der innere Schenkel derart in der Ortskurve liegt, daß beim Einsetzen des Stiftes (10) in das kreisförmige Loch (15) die nach außen gerichteten Ränder der äußeren Schenkel (19, 21) zuerst mit dem Lochumfang in Kontakt gelangen, wodurch in jedem Kontaktpunkt ein Torsionsmoment erzeugt wird, so daß die äußeren Schenkel (19, 21) zur Realisierung einer zueinander geneigten Form verdreht und um den inneren Schenkel (20) aufeinander zu gebogen werden, und daß der Kontakt des inneren Schenkels (20) mit dem Umfang des Loches (15) auf Grund der später entstehenden Form eine gegen die Stiftmitte gerichtete senkrechte Radialkraft erzeugt, so daß dere innere Schenkel (20) derart verschoben wird, daß die beiden äußeren Schenkel (19, 21) ihn keilförmig zwischen sich erfassen.
2. Elektrischer Kontaktstift nach Anspruch 1, dadurch gekennzeichnet, daß die Durchschnitte (17, 18) so ausgebildet sind, daß die äußeren Schenkel (19,21) dünner als der zentrale Schenkel (20) sind, um beim Einsetzen des Stiftes (10) in ein Loch (15) einer gedruckten Schaltung das Verdrehen und das Aufeinanderzubiegen der äußeren Schenkel (19, 21) verbessert wird.
3. Elektrischer Kontaktstift nach Anspruch 1, dadurch gekennzeichnet, daß die drei federnden Schenkel (19, 20, 21) mit ihren Enden mit dem Stiftkörper (10) verbunden sind.
4. Elektrischer Kontaktstift nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß ein Ende des inneren Schenkels (20) vom Stiftkörper (10) abgeschnitten ist.
5. Elektrischer Kontaktstift nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß die Außenränder bzw. -flächen der federnden Schenkel, welche die Kontaktbereiche für das Ineingrifftreten mit der Innenseite eines Lochs (15) in einer gedruckten Schaltung bilden, eine wellenförmige Konfiguration (22) aufweisen, so daß zwischen dem Zinn-Blei-Überzug des Stiftes und dem Loch ein "Kaltverschweißen" auftritt.
6. Elektrischer Kontaktstift nach Anspruch 1, dadurch gekennzeichnet, daß die Außenseite (30) des zentralen Schenkels mit einer in Längsrichtung und zentral angeordneten Kerbe bzw. Nut (32) versehen ist.
7. Elektrischer Kontaktstift nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis zwischen der Breite (M) des zentralen Schenkels (20) und der Breite (B) jedes Außenschenkels (19 oder 21) im wesentlichen zwischen 1,05 und 1,2 liegt.
8. Elektrischer Kontaktstift nach Anspruch 7, dadurch gekennzeichnet, daß das Verhältnis zwischen den Breiten (M/B) der Schenkel bei einer Stiftmaterialdicke (D) von 0,63 mm gleich 1,13 ist.
9. Elektrischer Kontaktstift nach Anspruch 1, dadurch gekennzeichnet, daß die Seitenwände des zentralen Schenkels (20) gegen die Innenseite (34) konisch geformt (36) sind, um die keilförmige Wirkung des zentralen Schenkels (20) zu verbessern.
10. Elektrischer Kontaktstift nach Anspruch 1, dadurch gekennzeichnet, daß die abgerundeten Außenränder (R2) der Schenkel (19, 21) einen größeren Radius als die abgerundeten Innenränder (R1) dieser Schenkel (19, 21) besitzen.
EP19830870089 1982-08-31 1983-08-31 Elektrischer Stift zum Gebrauch in gedruckten Schaltungsplatten Expired EP0105044B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
BE208920 1982-08-31
BE0/208920A BE894258A (nl) 1982-08-31 1982-08-31 Elektrische kontaktpen voor gedrukte schakelingen
BE210658 1983-04-29
BE210658 1983-04-29

Publications (2)

Publication Number Publication Date
EP0105044A1 EP0105044A1 (de) 1984-04-04
EP0105044B1 true EP0105044B1 (de) 1986-10-29

Family

ID=25653283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830870089 Expired EP0105044B1 (de) 1982-08-31 1983-08-31 Elektrischer Stift zum Gebrauch in gedruckten Schaltungsplatten

Country Status (3)

Country Link
EP (1) EP0105044B1 (de)
DE (1) DE3367305D1 (de)
FI (1) FI833096A (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691979A (en) * 1983-08-04 1987-09-08 Manda R & D Compliant press-fit electrical contact
EP0141492A3 (de) * 1983-10-24 1985-07-03 Microdot Inc. Kontaktstift für elektrische Leiterplatte
GB8416723D0 (en) * 1984-06-30 1984-08-01 Smiths Industries Plc Electrical contact elements
AT386699B (de) * 1985-02-27 1988-09-26 Neumayer Karl Kontaktstift
DE3537164C1 (de) * 1985-10-18 1987-01-08 Leonhardy Gmbh Anschlussstift fuer Ioetfreie Anschlusstechniken
EP0225400B1 (de) * 1985-12-11 1991-02-27 Burndy Electra N.V. Kontaktstift
GB2186124A (en) * 1986-01-30 1987-08-05 Plessey Co Plc Contact pin
US4735587A (en) * 1986-02-12 1988-04-05 Specialty Electronics, Inc. Pin header with board retention tail
DE3801352A1 (de) * 1988-01-19 1989-07-27 Standard Elektrik Lorenz Ag Leiterplatte
EP0367866B1 (de) * 1988-11-07 1991-09-25 Burndy Electra N.V. Kontaktstift
US5035656A (en) * 1990-05-15 1991-07-30 E. I. Du Pont De Nemours And Company Connector, circuit board contact element and retention portion
US7377823B2 (en) 2005-05-23 2008-05-27 J.S.T. Corporation Press-fit pin
JP2008091610A (ja) * 2006-10-02 2008-04-17 Sumitomo Wiring Syst Ltd プリント基板
DE102008064590B3 (de) * 2008-12-19 2010-07-15 Tyco Electronics Amp Gmbh Kontaktanordnung zur Verbindung mit einer polygonalen Buchse

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1132614B (de) * 1960-09-29 1962-07-05 Ft Products Ltd Anschlussstecker
NL130848C (de) * 1964-02-27
US3783433A (en) * 1971-01-18 1974-01-01 Litton Systems Inc Solderless electrical connection system
JPS5163460A (en) * 1974-10-10 1976-06-01 Du Pont Kairobanpin oyobi hoho

Also Published As

Publication number Publication date
DE3367305D1 (en) 1986-12-04
EP0105044A1 (de) 1984-04-04
FI833096A0 (fi) 1983-08-31
FI833096A (fi) 1984-03-01

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