EP0089491B1 - Pin-shaped contact element to be mounted in the drill holes of a circuit board - Google Patents

Pin-shaped contact element to be mounted in the drill holes of a circuit board Download PDF

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Publication number
EP0089491B1
EP0089491B1 EP83101505A EP83101505A EP0089491B1 EP 0089491 B1 EP0089491 B1 EP 0089491B1 EP 83101505 A EP83101505 A EP 83101505A EP 83101505 A EP83101505 A EP 83101505A EP 0089491 B1 EP0089491 B1 EP 0089491B1
Authority
EP
European Patent Office
Prior art keywords
contact element
pin
connecting web
shaped contact
approximately
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
EP83101505A
Other languages
German (de)
French (fr)
Other versions
EP0089491A2 (en
EP0089491A3 (en
Inventor
Dietmar Dipl.-Kaufmann Harting
Hans Dipl.-Ing. Nagel
Wolfgang Dipl.-Ing. Brauer
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.)
Harting Electronics GmbH and Co KG
Original Assignee
Harting Electronics GmbH and Co KG
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 Harting Electronics GmbH and Co KG filed Critical Harting Electronics GmbH and Co KG
Priority to AT83101505T priority Critical patent/ATE34252T1/en
Publication of EP0089491A2 publication Critical patent/EP0089491A2/en
Publication of EP0089491A3 publication Critical patent/EP0089491A3/en
Application granted granted Critical
Publication of EP0089491B1 publication Critical patent/EP0089491B1/en
Expired legal-status Critical Current

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    • 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
    • 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

Definitions

  • the invention relates to a pin-shaped contact element for fastening in printed circuit board bores, preferably in metallized bores, with a fastening section which has two mutually movable, parallel side parts and the side parts are connected to one another by a spring-elastic, wavy connecting web.
  • the limbs of the web should preferably have an angle of approximately 45 ° to the side parts and enclose an angle of approximately 90 ° to one another.
  • the connecting web between the two side parts can also be W-shaped.
  • the connection (introduction) of the connecting web to the side parts is carried out on the end face on the inner surface of the side parts.
  • the known press-in pin is, on the whole, satisfactorily suitable for being pressed once into a metallized circuit board bore.
  • severe damage to the metallization often occurs by cutting into the edges, unless extremely tightly tolerated and coordinated bore and pin dimensions are provided, which are outside of economically producible and generally for such Contact pins and PCB holes are within the usual tolerances.
  • the present invention is based on the object to provide a pin-shaped contact element for pressing into metallized printed circuit board holes, the tolerance limits with regard to the hole and press-fit area dimensions are substantially increased, which has a uniform contact pressure of all contacting edges in the hole and in which the Possibility is given to press contact elements into the bore without damage and substantial irreversible deformation of the bore wall and also to be able to remove them again from the bore in order, for. B. for repair purposes to enable the problem-free exchange of contact elements.
  • a contact element inserted into the same hole should also have a vibration-proof, gas-tight long-term contact, making use of the tolerances that are common today in production technology.
  • a pin-shaped contact element with a highly elastic press-in area has been created, which can be used in printed circuit board bores with widely differing diameters, it also ensuring that the bore metallization is not damaged in an inadmissible manner or is deformed so that an exchange of possibly defective contact elements is easily possible.
  • vibration-proof, gas-tight contacting between the contact element and metallization is achieved via four contact zones.
  • the highly elastic press-in area not only makes it possible to remove contact elements from a hole and press a new contact element into the same hole, but it is also possible, if appropriate, to reinsert a contact element that was previously used in a hole.
  • Another advantage of the invention is that the press-in forces required to press in such a contact element are exerted are extremely low, which in turn gives the possibility of pressing a large number of contact elements together with a corresponding associated insulating body into a printed circuit board.
  • the fastening section is adjoined at the top in general by a pin, socket or fork contact, not shown here, as well as mounting and fastening devices for an insulating body.
  • the contact element ends in a chamfered insertion tip or continues in the form of a rectangular connection post for wire winding technology. This area is also not shown here in order to limit the drawings to the essentials of the invention, namely the fastening section 1.
  • the fastening section can be produced in a particularly advantageous manner from round as well as rectangular starting material.
  • the side parts are shaped in one stamping process.
  • the fastening section with the insertion bevel 4 merges into the lower contact element region 5.
  • the outer edges 8 of the side parts 3 come into intimate contact with the bore wall and the elastic suspension of the connecting web 9 in connection with a certain elasticity of the transitions of the side parts in the upper or lower contact element area causes a constant pressure force of the edges against the bore wall.
  • Contact elements of this type can be used in bores with widely differing diameters, in each case reliable holding and contacting with the metallized bore walls being achieved.
  • the bores are those whose different diameters are due, on the one hand, to manufacturing tolerances and, on the other hand, to the different structure of the bore metallization. These diameter tolerances are usually in the range of + 5% ... + 8% without having to use particularly complex and costly production processes.
  • a fastening section 1 of a contact element is shown, which can be produced in a particularly advantageous manner from round as well as rectangular starting material.
  • an enlarged image scale was chosen in FIGS. 2 and 3.
  • the material of the contact pin of this embodiment is provided in the fastening section 1 with opposing impressions, so that on the one hand the parallel side parts 3 are formed and on the other hand a wavy connecting web 9 is formed here between the two side parts.
  • the connecting web has three bends (deflections) 10, the “neutral fiber” 11 merging into the respective side part 3 at an angle a of 45 °.
  • the bends are designed in such a way that tangents applied to the neutral fiber form an angle ⁇ of 90 °.
  • the connecting web is integrally formed on the side surface of the respective side part, whereby the parallelism of the side parts to one another is favorably influenced when the contact pin is pressed into a bore and a largely uniform edge pressure of all contact edges 8 in the bore is achieved.
  • the transitions from the material of the connecting web to the respective side part are provided with curves 12, 12 ', since such a transition can be produced more economically on the one hand than a sharp-edged transition and, on the other hand, such a smooth transition has a favorable effect on the angular stability when pressed in out.
  • the thickness corresponds to b of the connecting web about 1/3 of the thickness a of the side parts, has the self-resilient during lateral compression properties. Furthermore, the outer edges 8 of the side webs 3, which come into contact with the bore wall when inserted, are rounded in order to largely avoid damage to the bore wall.
  • FIG. 3 shows a modified fastening section of a contact element in cross section.
  • the essential dimensions and dimensions correspond to the fastening section shown in FIG. 2 and explained in more detail above.
  • the “neutral fiber” 11 of the connecting web 9 when entering the respective Se ' ' Part 3 runs at right angles to this.
  • the tangents of the bends 10 form an angle y of 45 ° in each case.
  • FIG. 4 shows the use of a contact element according to a fastening section.
  • Fig. 2 shown in a circuit board bore 13. 4 shows the use in a bore with a maximum diameter, while FIG. 5 shows the use in a bore with a minimum diameter.
  • the wall of the bore 13 of the circuit board 14 is provided with a copper metallization 15 and a tin support 16.
  • the edges 8 of the side parts 3 come into intimate contact with the metallization of the bore wall when the fastening section is pressed in, the edges 8 penetrating into the relatively soft tin layer 16.
  • the tin material 17 pushed away is closely attached to the contact areas of the side parts and guarantees a gas-tight seal of the contact point to the surrounding atmosphere.
  • the wavy, resilient connecting web 9 has in this case (largest bore diameter) been compressed only slightly, but care has been taken by appropriate design of the initial dimensions according to FIG. 2 that the spring force of the connecting web is sufficient to ensure perfect long-term contact of the side parts to achieve with the bore wall.
  • FIG. 5 shows, for example, how the spring-elastic connecting web 9 deforms when the fastening section is pressed into a printed circuit board bore 13 with a minimal diameter. It can be seen that the corrugated connecting web is largely compressed here, the side parts 3 being pressed against the bore wall with greater force. Although a certain small amount of irreversible, plastic deformation can occur during the extensive deformation of the connecting web, a large amount of resilient deformation remains, which ensures the resilient pressing of the edges of the side parts onto the bore wall. Due to the rounding of the edges 8 of the side parts, it is also ensured here that the edges do not damage the metallization and only deform to a small extent.

Abstract

A pin-shaped contact element to be connected or fastened in a metallized conductor plate bore has a fastening portion with two sidepieces which are movable towards each other and which are connected to each other by a resilient, undulating connecting bridge, the edges of the side pieces which come into contact with the bore walls and the juncture between the bridge and the side pieces being rounded.

Description

Die Erfindung betrifft ein stiftförmiges Kontaktelement zur Befestigung in Leiterplatten-Bohrungen, vorzugsweise im metallisierten Bohrungen, mit einem Befestigungsabschnitt, der zwei gegeneinander bewegliche, parallele Seitenteile aufweist und wobei die Seitenteile durch einen federelastischen, wellenförmigen Verbindungssteg miteinander verbunden sind.The invention relates to a pin-shaped contact element for fastening in printed circuit board bores, preferably in metallized bores, with a fastening section which has two mutually movable, parallel side parts and the side parts are connected to one another by a spring-elastic, wavy connecting web.

Ganz allgemein ist es für Kontaktelemente, die in metallisierte Leiterplatten-Bohrungen eingedrückt werden und dabei mit der Bohrungswandung in elektrischen Kontakt gelangen, erforderlich, dass diese Kontaktelemente zum einen in Bohrungen mit unterschiedlichen Durchmessern eingesetzt werden können, wobei die elektrische Kontaktgabe mit der Bohrungswandung in jedem Falle ausreichend sein muss, und zum anderen ist ein Auswechseln von gegebenenfalls defekten Kontaktelementen zu Reparaturzwecken erforderlich. Dabei muss sichergestellt sein, dass die Metallisierung der Leiterplatten-Bohrung beim Einpressen von Kontaktelementen nicht in unzulässiger Weise deformiert und beschädigt wird. Bei einem bekannten stiftförmigen Kontaktelement der eingangs angegebenen Art (DE-U-8 105 896) ist der die beiden Seitenteile des Befestigungsabschnittes miteinander verbindende, verformbare Verbindungssteg teils plastisch, teils elastisch verformbar. Bei diesem bekannten Einpressstift ist der Querschnitt des Befestigungsabschnittes M-, N- oder X-förmig ausgebildet.In very general terms, it is necessary for contact elements that are pressed into metallized printed circuit board bores and thereby come into electrical contact with the bore wall that these contact elements can be used in bores with different diameters, the electrical contact with the bore wall in each If it has to be sufficient, and on the other hand it is necessary to replace any defective contact elements for repair purposes. It must be ensured that the metallization of the PCB hole is not deformed and damaged in an inadmissible manner when pressing in contact elements. In a known pin-shaped contact element of the type specified at the beginning (DE-U-8 105 896), the deformable connecting web connecting the two side parts of the fastening section to one another is partly plastically, partly elastically deformable. In this known press-in pin, the cross section of the fastening section is M-shaped, N-shaped or X-shaped.

Bei der M-förmigen Ausbildung sollen vorzugsweise die Schenkel des Steges einen Winkel von etwa 45° zu den Seitenteilen aufweisen und zueinander einen Winkel von etwa 90° einschliessen. Weiterhin kann der Verbindungssteg zwischen den beiden Seitenteilen auch W-förmig ausgebildet sein. Bei dem bekannten Einpressstift ist vorgesehen, dass die Anbindung (Einleitung) des Verbindungssteges an die Seitenteile (im Querschnitt gesehen) endseitig auf der Innenfläche der Seitenteile erfolgt.In the case of the M-shaped design, the limbs of the web should preferably have an angle of approximately 45 ° to the side parts and enclose an angle of approximately 90 ° to one another. Furthermore, the connecting web between the two side parts can also be W-shaped. In the known press-in pin, it is provided that the connection (introduction) of the connecting web to the side parts (viewed in cross section) is carried out on the end face on the inner surface of the side parts.

Der bekannte Einpressstift ist zum einmaligen Einpressen in eine metallisierte Leiterplatten-Bohrung im grossen und ganzen zufriedenstellend geeignet. Jedoch treten aufgrund der scharfkantigen Ausbildung der Berührungskanten der Seitenteile zur Bohrungsmetallisierung oftmals starke Beschädigungen der Metallisierung durch Einschneiden der Kanten in diese auf, wenn nicht äusserst eng tolerierte und aufeinander abgestimmte Bohrungs- und Stiftabmessungen vorgesehen werden, die ausserhalb von wirtschaftlich zu fertigenden und allgemein für derartige Kontaktstifte und Leiterplatten-Bohrungen üblichen Toleranzen liegen.The known press-in pin is, on the whole, satisfactorily suitable for being pressed once into a metallized circuit board bore. However, due to the sharp-edged design of the contact edges of the side parts for bore metallization, severe damage to the metallization often occurs by cutting into the edges, unless extremely tightly tolerated and coordinated bore and pin dimensions are provided, which are outside of economically producible and generally for such Contact pins and PCB holes are within the usual tolerances.

Daneben treten bei der bekannten Einpressstift-Ausbildung ungleichmässige Kantenbelastungen der Kontaktierungs-Kanten in der Bohrung durch die endseitige Befestigung des Verbindungssteges an den Seitenteilen auf, was wiederum zu Verdreh- und Kippneigungen des einzupressenden Stiftes führt. Durch die insgesamt gesehen hervorgerufenen irreversiblen Beschädigungen und Deformierungen der Bohrungs-Metallisierung ist ein Auswechseln, d.h. Entfernen eines Stiftes aus einer Bohrung und Einfügen eines neuen Stiftes in die gleiche Bohrung, oftmals nicht zufriedenstellend möglich. Hier treten häufig Kontaktierungsprobleme, gerade im Hinblick auf die erforderliche gasdichte, rüttelsichere Langzeitkontaktierung auf.In addition, in the known press-in pin design, uneven edge loads on the contacting edges in the bore occur due to the end fastening of the connecting web on the side parts, which in turn leads to twisting and tilting tendencies of the pin to be pressed in. Due to the irreversible damage and deformation of the bore metallization caused overall, a replacement, i.e. Removing a pin from a hole and inserting a new pin into the same hole, often unsatisfactorily possible. Contacting problems often arise here, especially with regard to the required gas-tight, vibration-proof long-term contacting.

Der vorliegenden Erfindung liegt nunmehr die Aufgabe zugrunde, ein stiftförmiges Kontaktelement zum Einpressen in metallisierte Leiterplatten-Bohrungen zu schaffen, dessen Toleranzgrenzen hinsichtlich der Bohrungs- und Einpressbereichs-Abmessungen wesentlich vergrössert sind, das einen gleichmässigen Kontaktdruck aller Kontaktierungskanten in der Bohrung aufweist und bei dem die Möglichkeit gegeben ist, Kontaktelemente ohne Beschädigung und wesentliche irreversible Deformation der Bohrungswandung in die Bohrung einzupressen und auch wieder aus der Bohrung entfernen zu können, um z. B. zu Reparaturzwecken den problemlosen Austausch von Kontaktelementen zu ermöglichen. Dabei soll auch ein in die gleiche Bohrung eingesetztes Kontaktelement unter Ausnutzung der fertigungstechnisch heute üblichen Toleranzen eine rüttelsichere, gasdichte Langzeitkontaktgabe aufweisen.The present invention is based on the object to provide a pin-shaped contact element for pressing into metallized printed circuit board holes, the tolerance limits with regard to the hole and press-fit area dimensions are substantially increased, which has a uniform contact pressure of all contacting edges in the hole and in which the Possibility is given to press contact elements into the bore without damage and substantial irreversible deformation of the bore wall and also to be able to remove them again from the bore in order, for. B. for repair purposes to enable the problem-free exchange of contact elements. In this case, a contact element inserted into the same hole should also have a vibration-proof, gas-tight long-term contact, making use of the tolerances that are common today in production technology.

Es hat sich nun gezeigt, dass sich diese Aufgabe in technisch fortschrittlicher Weise dadurch lösen lässt, dass der Verbindungssteg jeweils etwa auf der Mitte der inneren Fläche der Seitenteile angesetzt ist, dass die Übergänge vom Verbindungssteg zum jeweiligen Seitenteil mit Verrundungen versehen sind und dass die mit den Bohrungswandungen der Leiterplatte in Kontakt tretenden Kanten der Seitenteile mit Rundungen versehen sind.It has now been shown that this task can be achieved in a technically progressive manner in that the connecting web is positioned approximately in the middle of the inner surface of the side parts, that the transitions from the connecting web to the respective side part are provided with roundings and that with the bore walls of the printed circuit board contacting edges of the side parts are provided with curves.

Weitere vorteilhafte Ausbildungen des erfindungsgemässen Kontaktelementes sind in den Ansprüchen 2-5 angegeben.Further advantageous developments of the contact element according to the invention are specified in claims 2-5.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass ein stiftförmiges Kontaktelement mit einem hochelastischen Einpressbereich geschaffen wurde, das in Leiterplatten-Bohrungen mit stark unterschiedlichen Durchmessern eingesetzt werden kann, wobei darüber hinaus sichergestellt ist, dass die Bohrungs- Metallisierung nicht in unzulässiger Weise beschädigt bzw. deformiert wird, so dass ein Auswechseln eventuell defekter Kontaktelemente ohne weiteres möglich ist. Es wird in jedem Falle ein vibrationssichere, gasdichte Kontaktierung zwischen Kontaktelement und Metallisierung über vier Kontaktzonen erzielt. Darüber hinaus ist es durch den hochelastischen Einpressbereich nicht nur möglich, Kontaktelemente aus einer Bohrung zu entfernen und ein neues Kontaktelement in die gleiche Bohrung einzupressen, sondern es kann ggf. auch ein bereits vorher benutztes Kontaktelement erneut in eine Bohrung eingesetzt werden.The advantages achieved by the invention consist in particular in the fact that a pin-shaped contact element with a highly elastic press-in area has been created, which can be used in printed circuit board bores with widely differing diameters, it also ensuring that the bore metallization is not damaged in an inadmissible manner or is deformed so that an exchange of possibly defective contact elements is easily possible. In any case, vibration-proof, gas-tight contacting between the contact element and metallization is achieved via four contact zones. In addition, the highly elastic press-in area not only makes it possible to remove contact elements from a hole and press a new contact element into the same hole, but it is also possible, if appropriate, to reinsert a contact element that was previously used in a hole.

Ein weiterer Vorteil der Erfindung besteht darin, dass die zum Einpressen eines derartigen Kontaktelementes erforderlichen Einpresskräfte äusserst gering sind, wodurch wiederum die Möglichkeit gegeben ist, eine Vielzahl von Kontaktelementen gemeinsam mit einem entsprechenden zugehörigen lsolierkörper in eine Leiterplatte einzupressen.Another advantage of the invention is that the press-in forces required to press in such a contact element are exerted are extremely low, which in turn gives the possibility of pressing a large number of contact elements together with a corresponding associated insulating body into a printed circuit board.

Im folgenden wird die Erfindung anhand von lediglich Ausführungsbeispiele darstellenden Zeichnungen erläutert.In the following, the invention will be explained with reference to drawings that show exemplary embodiments only.

Es zeigen:

  • Fig. 1 die Ansicht des Befestigungsabschnittes eines Kontaktelementes,
  • Fig. 2 die Ansicht des Befestigungsabschnittes des Kontaktelementes gem. Fig. 1 im Schnitt entlang der Linie 2-2 in vergrösserter Darstellung,
  • Fig. 3 die Ansicht des Querschnittes eines abgewandelten Befestigungsabschnittes in vergrösserter Darstellung,
  • Fig. 4 den Querschnitt eines in eine Leiterplattenbohrung maximalen Durchmessers eingesetzten Kontaktelementes gem. Fig. 1, in vergrösserter Darstellung, und
  • Fig. 5 den Querschnitt eines in eine Leiterplattenbohrung minimalen Durchmessers eingesetzten Kontaktelementes gem. Fig. 1, in vergrösserter Darstellung.
Show it:
  • 1 is a view of the fastening section of a contact element,
  • Fig. 2 shows the view of the mounting portion of the contact element acc. 1 in section along the line 2-2 in an enlarged view,
  • 3 is an enlarged view of the cross section of a modified fastening section,
  • Fig. 4 shows the cross section of a contact element inserted into a circuit board hole of maximum diameter according to. Fig. 1, in an enlarged view, and
  • 5 shows the cross section of a contact element inserted into a circuit board bore with a minimum diameter in accordance with FIG. Fig. 1, in an enlarged view.

In der Fig. 1 ist der Befestigungsabschnitt 1 eines stiftförmigen Kontaktelementes 2 dargestellt.1 shows the fastening section 1 of a pin-shaped contact element 2.

An den Befestigungsabschnitt schliesst sich nach oben hin im allgemeinen ein hier nicht näher dargestellter Stift-, Buchsen- oder Gabelkontakt, sowie Halterungs- und Befestigungs-Einrichtungen für einen Isolierkörper an. Nach unten hin endet das Kontaktelement in einer angeschrägten Einführungsspitze oder setzt sich in Form eines rechteckigen Anschlusspfostens für Drahtwickel-Technik fort. Auch dieser Bereich ist hier nicht näher dargestellt, um die Zeichnungen auf das wesentliche der Erfindung, nämlich den Befestigungsabschnitt 1 zu beschränken.The fastening section is adjoined at the top in general by a pin, socket or fork contact, not shown here, as well as mounting and fastening devices for an insulating body. At the bottom, the contact element ends in a chamfered insertion tip or continues in the form of a rectangular connection post for wire winding technology. This area is also not shown here in order to limit the drawings to the essentials of the invention, namely the fastening section 1.

Der Befestigungsabschnitt kann auf besonders vorteilhafte Weise aus rundem wie auch rechtekkigem Ausgangsmaterial hergestellt werden. Die Formung der Seitenteile erfolgt dabei in einem Prägevorgang. Zur Erleichterung des Einführens des Befestigungsabschnittes in eine Leiterplatten-bohrung geht der Befestigungsabschnitt mit der Einführschräge 4 in den unteren Kontaktelementbereich 5 über. Beim Einsetzen (Einpressen) des Befestigungsabschnittes in eine Leiterplattenbohrung mit geringerem Durchmesser als dem Durchmesser des Umkreises 7 des Befestigungsabschnittes treten die äusseren Kanten 8 der Seitenteile 3 in innigen Kontakt mit der Bohrungswandung und die elastische Federung des Verbindungssteges 9 in Verbindung mit einer gewissen Elastizität der Übergänge der Seitenteile in den oberen bzw. unteren Kontaktelementbereich bewirkt eine konstante Andruckkraft der Kanten an die Bohrungswandung. Derartige Kontaktelemente können in Bohrungen mit stark unterschiedlichen Durchmessern eingesetzt werden, wobei in jedem Falle eine sichere Halterung und Kontaktgabe zu den metallisierten Bohrungswandungen erzielt wird.The fastening section can be produced in a particularly advantageous manner from round as well as rectangular starting material. The side parts are shaped in one stamping process. In order to facilitate the insertion of the fastening section into a printed circuit board bore, the fastening section with the insertion bevel 4 merges into the lower contact element region 5. When inserting (pressing) the fastening section into a circuit board bore with a smaller diameter than the diameter of the circumference 7 of the fastening section, the outer edges 8 of the side parts 3 come into intimate contact with the bore wall and the elastic suspension of the connecting web 9 in connection with a certain elasticity of the transitions of the side parts in the upper or lower contact element area causes a constant pressure force of the edges against the bore wall. Contact elements of this type can be used in bores with widely differing diameters, in each case reliable holding and contacting with the metallized bore walls being achieved.

Der Vollständigkeit halber sei hier noch erwähnt, dass es sich bei den Bohrungen um solche handelt, deren unterschiedliche Durchmesser zum einen durch Herstellungstoleranzen und zum anderen durch unterschiedlichen Aufbau der Bohrungsmetallisierung begründet sind. Dabei liegen diese Durchmessertoleranzen, ohne besonders aufwendige und kostspielige Herstellungsverfahren anwenden zu müssen, üblicherweise im Bereich von + 5% ... + 8%.For the sake of completeness, it should also be mentioned here that the bores are those whose different diameters are due, on the one hand, to manufacturing tolerances and, on the other hand, to the different structure of the bore metallization. These diameter tolerances are usually in the range of + 5% ... + 8% without having to use particularly complex and costly production processes.

In den Fig. 1, 2 und 3 ist ein Befestigungsabschnitt 1 eines Kontaktelementes dargestellt, der auf besonders vorteilhafte Weise aus rundem wie auch rechteckigem Ausgangsmaterial hergestellt werden kann. Zur Verdeutlichung der Einzelheiten wurde bei den Fig. 2 und 3 ein vergrösserter Abbildungsmassstab gewählt.1, 2 and 3, a fastening section 1 of a contact element is shown, which can be produced in a particularly advantageous manner from round as well as rectangular starting material. In order to clarify the details, an enlarged image scale was chosen in FIGS. 2 and 3.

Im folgenden wird zunächst die Ausbildung des Befestigungsabschnittes gemäss Fig. 2 näher erläutert. Das Material des Kontaktstiftes dieser Ausführungsform ist im Befestigungsabschnitt 1 mit gegenüberliegenden Einprägungen versehen, so dass zum einen die parallelen Seitenteile 3 geformt werden und zum anderen ist hier ein wellenförmiger Verbindungssteg 9 zwischen den beiden Seitenteilen ausgebildet. Der Verbindungssteg weist dabei drei Umbiegungen (Umlenkungen) 10 auf, wobei die «neutrale Faser» 11 unter einem Winkel a von 45° in das jeweilige Seitenteil 3 übergeht. Die Umbiegungen sind derart gestaltet, dass hierbei an die neutrale Faser angelegte Tangenten einen Winkel β von 90° einschliessen.In the following, the design of the fastening section according to FIG. 2 is first explained in more detail. The material of the contact pin of this embodiment is provided in the fastening section 1 with opposing impressions, so that on the one hand the parallel side parts 3 are formed and on the other hand a wavy connecting web 9 is formed here between the two side parts. The connecting web has three bends (deflections) 10, the “neutral fiber” 11 merging into the respective side part 3 at an angle a of 45 °. The bends are designed in such a way that tangents applied to the neutral fiber form an angle β of 90 °.

Weiterhin ist der Verbindungssteg mittig auf der Seitenfläche des jeweiligen Seitenteiles angeformt, wodurch die Parallelität der Seitenteile zueinander beim Eindrücken des Kontaktstiftes in eine Bohrung günstig beeinflusst wird und ein weitgehend gleichmässiger Kantendruck aller Berührungskanten 8 in der Bohrung erzielt wird. Die Übergänge vom Material des Verbindungssteges zum jeweiligen Seitenteil sind mit Rundungen 12, 12' versehen, da sich ein derartiger Übergang zum einen fertigungstechnisch günstiger herstellen lässt als ein scharfkantiger Übergang und zum anderen wirkt sich ein derartiger gleitender Übergang günstig für die Winkel-Stabilität beim Einpressen aus. Durch geeignete Wahl des Stiftmaterials und entsprechend dünne Ausbildung des Verbindungssteges, vorzugsweise entspricht die Stärke b des Verbindungssteges etwa 1/3 der Dikke a der Seitenteile, weist dieser beim seitlichen Zusammendrücken selbst federelastische Eigenschaften auf. Weiterhin sind die äusseren Kanten 8 der Seitenstege 3, die beim Einsetzen mit der Bohrungswandung in Berührung gelangen, abgerundet, um eine Beschädigung der Bohrungswandung weitgehend zu vermeiden.Furthermore, the connecting web is integrally formed on the side surface of the respective side part, whereby the parallelism of the side parts to one another is favorably influenced when the contact pin is pressed into a bore and a largely uniform edge pressure of all contact edges 8 in the bore is achieved. The transitions from the material of the connecting web to the respective side part are provided with curves 12, 12 ', since such a transition can be produced more economically on the one hand than a sharp-edged transition and, on the other hand, such a smooth transition has a favorable effect on the angular stability when pressed in out. By suitable choice of the pin material and correspondingly thin formation of the connecting web, preferably the thickness corresponds to b of the connecting web about 1/3 of the thickness a of the side parts, has the self-resilient during lateral compression properties. Furthermore, the outer edges 8 of the side webs 3, which come into contact with the bore wall when inserted, are rounded in order to largely avoid damage to the bore wall.

In der Fig. 3 ist ein abgewandelter Befestigungsabschnitt eines Kontaktelementes im Querschnitt dargestellt. Die wesentlichen Abmessungen und Dimensionierungen entsprechen dem in der Fig. 2 dargestellten und vorstehend näher erläuterten Befestigungsabschnitt. Jedoch ist hier vorgesehen, dass die «neutrale Faser» 11 des Verbindungssteges 9 beim Eintritt in das jeweqige Se'' tenteil 3 rechtwinklig zu diesem verläuft. Weiterhin ist hierbei vorgesehen, dass die Tangenten der Umbiegungen 10 einen Winkel y von jeweils 45° einschliessen. Um ein gleichmässiges Einpressen des Befestigungsabschnittes in eine Bohrung zu gewährleisten und ein Verkanten des Befestigungsabschnittes durch ungleichmässiges aufeinanderzu bewegen der Enden der Seitenteile (Kippneigung aufeinanderzu) zu verhindern und um somit einen gleichmässigen Kantendruck aller vier Berührungskanten 8 an die Bohrungswandung zu erzielen, ist bei dieser Ausführung, abweichend von der Einleitung des Verbindungssteges in das jeweilige Seitenteil gem. Fig. 2 vorgesehen, dass die Einleitung des Verbindungssteges in das Seitenteil 3 versetzt zur Mitte des jeweiligen Seitenteiles erfolgt, und zwar soweit, dass der innere Umkehrpunkt 18 der mittleren Umbiegung in etwa die querverlaufende Mittellinie 19 tangiert.3 shows a modified fastening section of a contact element in cross section. The essential dimensions and dimensions correspond to the fastening section shown in FIG. 2 and explained in more detail above. However, it is provided here that the “neutral fiber” 11 of the connecting web 9 when entering the respective Se ' ' Part 3 runs at right angles to this. It is also provided here that the tangents of the bends 10 form an angle y of 45 ° in each case. In this embodiment, in order to ensure a uniform pressing of the fastening section into a bore and to prevent the fastening section from tilting by unevenly moving the ends of the side parts towards one another (tilting tendency towards one another) and thus to achieve a uniform edge pressure of all four contact edges 8 on the wall of the hole , deviating from the introduction of the connecting web into the respective side part acc. Fig. 2 provided that the introduction of the connecting web into the side part 3 takes place offset to the center of the respective side part, to the extent that the inner reversal point 18 of the middle bend affects approximately the transverse center line 19.

Mit dieser Ausbildung des Befestigungsabschnittes wird ein noch weicheres Federungsverhalten des Verbindungssteges erzielt und auch die Kippneigung der Enden der Seitenteile aufeinanderzu beim Einpressen in eine Bohrung ist vollständig eliminiert.With this design of the fastening section, an even softer suspension behavior of the connecting web is achieved and the tendency of the ends of the side parts to tilt toward one another when pressed into a bore is completely eliminated.

In den Fig. 4 und 5 ist der Einsatz eines Kontaktelementes mit einem Befestigungsabschnitt gem. Fig. 2 in einer Leiterplatten-Bohrung 13 dargestellt. Dabei zeigt die Fig. 4 den Einsatz in eine Bohrung mit maximalem Durchmesser, während die Fig. 5 den Einsatz in eine Bohrung minimalen Durchmessers zeigt. Zur besseren Verdeutlichung wurde auch bei diesen Abbildungen ein vergrösserter Massstab gewählt. Die Wandung der Bohrung 13 der Leiterplatte 14 ist mit einer Kupfer-Metallisierung 15 und einer Zinnauflage 16 versehen.4 and 5, the use of a contact element according to a fastening section. Fig. 2 shown in a circuit board bore 13. 4 shows the use in a bore with a maximum diameter, while FIG. 5 shows the use in a bore with a minimum diameter. For better clarification, an enlarged scale has also been chosen for these illustrations. The wall of the bore 13 of the circuit board 14 is provided with a copper metallization 15 and a tin support 16.

Wie in Fig. 4 gezeigt, gelangen die Kanten 8 der Seitenteile 3 beim Einpressen des Befestigungsabschnittes in innigen Kontakt mit der Metallisierung der Bohrungswandung, wobei die Kanten 8 in die relativ weiche Zinnschicht 16 eindringen. Das weggedrückte Zinnmaterial 17 lagert sich dabei eng an die Kontaktbereiche der Seitenteile an ud gewährleistet hier einen gasdichten Abschluss der Kontaktstelle zur umgebenden Atmosphäre.As shown in FIG. 4, the edges 8 of the side parts 3 come into intimate contact with the metallization of the bore wall when the fastening section is pressed in, the edges 8 penetrating into the relatively soft tin layer 16. The tin material 17 pushed away is closely attached to the contact areas of the side parts and guarantees a gas-tight seal of the contact point to the surrounding atmosphere.

Der wellenförmige, federnde Verbindungssteg 9 ist in diesem Falle (grösster Bohrungsdurchmesser) nur geringfügig zusammengedrückt worden, jedoch ist durch entsprechende Ausbildung der Ausgangsabmessungen gemäss Fig. 2 dafür Sorge getragen, dass die Federkraft des Verbindungssteges ausreichend ist, um einen einwandfreien Langzeit-Kontakt der Seitenteile mit der Bohrungswandung zu erzielen.The wavy, resilient connecting web 9 has in this case (largest bore diameter) been compressed only slightly, but care has been taken by appropriate design of the initial dimensions according to FIG. 2 that the spring force of the connecting web is sufficient to ensure perfect long-term contact of the side parts to achieve with the bore wall.

In der Fig. 5 ist beispielsweise dargestellt, wie sich der federelastische Verbindungssteg 9 beim Einpressen des Befestigungsabschnittes in eine Leiterplatten-Bohrung 13 mit minimalem Durchmesser verformt. Man erkennt, dass hier der wellenförmige Verbindungssteg weitgehend zusammengedrückt ist, wobei die Seitenteile 3 hierbei mit grösserer Kraft gegen die Bohrungswandung gepresst werden. Obgleich bei der weitgehenden Verformung des Verbindungssteges ein gewisser geringer Anteil irreversibler, plastischer Verformung auftreten kann, bleibt noch ein grosser Anteil federelastischer Verformung bestehen, der das federnde Anpressen der Kanten der Seitenteile an die Bohrungswandung gewährleistet. Aufgrund der Abrundungen der Kanten 8 der Seitenteile ist auch hierbei sichergestellt, dass die Kanten die Metallisierung nicht beschädigen und nur in geringem Masse verformen.5 shows, for example, how the spring-elastic connecting web 9 deforms when the fastening section is pressed into a printed circuit board bore 13 with a minimal diameter. It can be seen that the corrugated connecting web is largely compressed here, the side parts 3 being pressed against the bore wall with greater force. Although a certain small amount of irreversible, plastic deformation can occur during the extensive deformation of the connecting web, a large amount of resilient deformation remains, which ensures the resilient pressing of the edges of the side parts onto the bore wall. Due to the rounding of the edges 8 of the side parts, it is also ensured here that the edges do not damage the metallization and only deform to a small extent.

Bei der erfindungsgemäss hochelastischen Ausbildung des Befestigungsabschnittes ist es ohne weiteres möglich, ein Kontaktelement wieder aus der Bohrung zu entfernen und ein neues Kontaktelement, gegebenenfalls das gleiche, oder ein bereits vorher benutztes Kontaktelement in die gleiche Bohrung einzusetzen.In the case of the highly elastic design of the fastening section according to the invention, it is readily possible to remove a contact element from the bore and to insert a new contact element, possibly the same, or a previously used contact element in the same bore.

Claims (6)

1. Pin-shaped contact element for mounting in holes in printed circuit boards, preferably in metallized holes, this contact element comprising a mounting section (1) that possesses two parallel side portions (3) which can move towards each other, and which are interconnected by a wavy connecting web (9) that exhibits spring-like resilience, characterized in that the connecting web (9) is joined to the inner surfaces of the side portions
(3) at approximately the mid-point of each of these surfaces, in that the transitions between the connecting web and the respective side portions are provided with rounded fillets (12, 12'), and in that those edges (8) of the side portions (3) which enter into contact with the walls (15, 16) of the holes in the circuit board (14) are rounded off.
2. Pin-shaped contact element according to Claim 1, characterized in that the thickness (b) of the material constituting the connecting web (9) corresponds to approximately 1/3 of the thickness (a) of the material constituting the side portions (3).
3. Pin-shaped contact element according to Claim 1 or 2, characterized in that the neutral fibre (11) of the connecting web (9) runs at an angle (a) of approximately 45° at the point where it enters each side portion (3), and in that the tangents drawn at the bends (10) in each case enclose an angle (β) of approximately 90°.
4. Pin-shaped contact element according to any one of the preceding Claims, characterized in that the neutral fibre (11) of the connecting web (9) runs at approximately right-angles to each of the side portions at the points where it enters them, and in that the tangents drawn at the bends in each case enclose an angle (y) of approximately 45°.
5. Pin-shaped contact element according to Claim 4, characterized in that the inner reversal point (18) of the central bend touches the transverse centreline (19) and, in addition, the neutral fibre (11) of the connecting web (9) is designed to enter the side portion (3) at a position which is offset from the mid-point of the inner surface of the side portion.
EP83101505A 1982-03-20 1983-02-17 Pin-shaped contact element to be mounted in the drill holes of a circuit board Expired EP0089491B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83101505T ATE34252T1 (en) 1982-03-20 1983-02-17 PIN-SHAPED CONTACT ELEMENT FOR MOUNTING IN PCB HOLES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3210348A DE3210348C1 (en) 1982-03-20 1982-03-20 Pin-shaped contact element for fastening in PCB holes
DE3210348 1982-03-20

Publications (3)

Publication Number Publication Date
EP0089491A2 EP0089491A2 (en) 1983-09-28
EP0089491A3 EP0089491A3 (en) 1985-07-31
EP0089491B1 true EP0089491B1 (en) 1988-05-11

Family

ID=6158890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101505A Expired EP0089491B1 (en) 1982-03-20 1983-02-17 Pin-shaped contact element to be mounted in the drill holes of a circuit board

Country Status (5)

Country Link
US (1) US4762498A (en)
EP (1) EP0089491B1 (en)
JP (3) JPS598037B2 (en)
AT (1) ATE34252T1 (en)
DE (2) DE3210348C1 (en)

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DE3831508C2 (en) * 1988-09-16 1997-02-13 Thomas & Betts Gmbh & Co Kg Elastic press-in pin for solderless connections
DE3832497C1 (en) * 1988-09-22 1989-04-20 Krone Ag, 1000 Berlin, De
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Also Published As

Publication number Publication date
JPS6249872U (en) 1987-03-27
JPH046131Y2 (en) 1992-02-20
JPS6249873U (en) 1987-03-27
EP0089491A2 (en) 1983-09-28
JPH0316219Y2 (en) 1991-04-08
DE3376603D1 (en) 1988-06-16
JPS598037B2 (en) 1984-02-22
JPS58172881A (en) 1983-10-11
US4762498A (en) 1988-08-09
ATE34252T1 (en) 1988-05-15
EP0089491A3 (en) 1985-07-31
DE3210348C1 (en) 1983-08-11

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