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Sommaire du brevet 2056713 

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L'apparition de différences dans le texte et l'image des Revendications et de l'Abrégé dépend du moment auquel le document est publié. Les textes des Revendications et de l'Abrégé sont affichés :

  • lorsque la demande peut être examinée par le public;
  • lorsque le brevet est émis (délivrance).
(12) Demande de brevet: (11) CA 2056713
(54) Titre français: TIGE DE CONNEXION AJUSTEE A LA PRESSE
(54) Titre anglais: PRESS-FIT CONNECTION PIN
Statut: Morte
Données bibliographiques
(51) Classification internationale des brevets (CIB):
  • H01R 13/04 (2006.01)
  • H01R 4/00 (2006.01)
  • H01R 13/05 (2006.01)
(72) Inventeurs :
  • BOSE, PETER (Allemagne)
(73) Titulaires :
  • BOSE, PETER (Non disponible)
  • THOMAS & BETTS CORPORATION (Etats-Unis d'Amérique)
(71) Demandeurs :
(74) Agent: MACRAE & CO.
(74) Co-agent:
(45) Délivré:
(22) Date de dépôt: 1991-11-29
(41) Mise à la disponibilité du public: 1992-05-30
Licence disponible: S.O.
(25) Langue des documents déposés: Anglais

Traité de coopération en matière de brevets (PCT): Non

(30) Données de priorité de la demande:
Numéro de la demande Pays / territoire Date
G 90 16 257.9 Allemagne 1990-11-29

Abrégés

Abrégé anglais




PRESS-FIT CONNECTION PIN
ABSTRACT:
A connection pin is pressed into through-
metallized bore in a printed circuit board. The connection
pin is preferably of slightly conical external shape and has
a recess which extends in its longitudinal direction and
which is open at one side. The provision of the recess
makes the press-in portion of the pin somewhat resilient.
The press-in portion is divided into a plurality of portions
of different external shapes. In spite of a high level of
resiliency and a sufficiently high pressing pressure,
metallization and tinning of the board bores are not scraped
off and the formation of cuttings is prevented.

Revendications

Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.


-8-

I CLAIM
1. A connection pin for insertion to a through-
metallized bore in a printed circuit board comprising, in
sequential order, a connection portion, a press-in portion,
a transition region and an introduction portion, said
introduction portion adapted to be inserted initially into
said through-metallized bore, said transition region
comprising three distinct sections, a first section
adjoining said press-in portion of decreasing outer
dimension, a second section adjoining said first section of
substantially constant outer dimension and a third section
of decreasing outer dimension adjoining said second section
and said introduction portion.
2. A connection pin according to claim 1, wherein
said press-in portion comprises an outer dimension gradually
decreasing in a direction toward the transition region.
3. A connection pin according to claim 2, wherein
said press-in portion has a generally cylindrical outer
configuration.
4. A connection pin according to claim 3, wherein
said outer configuration of said press-in portion tapers
downwardly toward said transition region approximately 0.5
degrees.
5. A connection pin according to claim 2, wherein
said press-in portion is generally of C-shaped cross-
section, defined by a pair of end limbs with a recess
extending therebetween.
6. A connection pin according to claim 3, wherein
said introduction portion is of cross-section different from
the cross-section of said press-in portion.
7. A connection pin according to claim 6, wherein
said cross-section of said introduction portion is
substantially rectangular.
8. A connection pin for insertion into a through-
metallized bore in a printed circuit board comprising an
introduction portion which decreases towards its tip, a




-9-

press-in portion which can be inserted with a press fit into
the bore and which is of a substantially cylindrical
external shape, and a recess which is provided in the press-
fit portion and extends in the longitudinal direction
thereof and is open at one side, said press-in portion
having an outside diameter which slightly decreases
conically in a downward direction toward its lower end into
a transition region, the transition region having a first
portion of decreasing outside diameter, an adjoining second
portion of constant outside diameter and an adjoining third
portion of a diameter which decreases to the outside
diameter of the introduction portion.
9. A connection pin according to claim 8, wherein the
outside diameter of the press-in portion has a conicity of
0.5 degrees.
10. A connection pin according to claim 8, wherein the
press-in portion is of C-shaped cross-section.
11. A connection pin according to claim 10, wherein
the C-shape has limbs, the ends of which embrace the recess
and which are rounded off.
12. A connection pin according to claim 11, wherein
the limbs of the C-shape are of a wall thickness which
increases towards their ends.
13. A connection pin according to claim 12, wherein
the inward and outward sides of the ends of the limbs of the
C-shape extend slightly outwardly with an increase in wall
thickness.
14. In combination:
a printed circuit board having a through-
metallized bore; and
a connection pin received in said bore in press-
fit manner, said connection pin comprising an elongate
press-in portion having an outer wall of generally
cylindrical configuration, said press-in portion outer wall
engaging said metallized bore at spaced upper and lower
longitudinal locations adjacent the opposed upper and lower


-10-

surfaces of said board, said press-in portion intermediate
said locations including a weakened portion contracted
inwardly of said press-in portion and spaced from said
metalliæed bore.
15. The combination according to claim 14, wherein
said press-in portion o said connection pin is of generally
C-shaped cross-section.
16. The combination according to claim 15, wherein
said C-shaped cross-section is defined by limbs, the ends of
which are of wall thickness greater than the center of said
C-shaped section.
17. The combination according to claim 14, wherein the
outer wall of said press-in portion is adapted to engage the
metallized bore in point contact.
18. The combination according to claim 17, wherein the
weakened portion of said press-in portion is adapted to
engage the metallized bore in point contacts, fewer in
number than the point contacts at either of said spaced
upper and lower locations.
19. The combination according to claim 18, wherein the
outer wall of said press-in portion engages said metallized
bore at the upper and lower locations in three contact
points and the weakened portion of said press-in portions
engages said metallized bore at two contact points.

Description

Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.


2~7~3

?.E- 3 71 PATENT

PRESS-FIT CONNECTION PIN

1 FIELD OF THE INVENTION:
The invention concerns a connection pin for
insertion into a through-metallized bore in a printed
circuit board.
BACKGROUND OF THE INVENTION:
Connection pins of the press-fit kind are known
for what is referred to as the solder-free connection
procedure. In a known connection pin (German patent
specification No. 2,937,883) the pxess-in portion is
~0 cylindrical and the introduction portion is conicalO That
means that the outside diameter of that known connection pin
increases to its full dimension without a transition in the
plane between the introduction and the pr~ss-in portions.
That further means that, when the connection pin is pressed
into the bore in a printed circuit board, the connection pin
suddenly enlarges the bore as soon as its press-in portion
reaches the upper edge of the bore. The compacting effect
on the material of the printed circuit board, which occurs
in that situation, does not cause any further risk. It
~0 happens, howev~r, that the metallization of the bore may be
scraped off and fine cuttings or slivers formed. Some time
afterwards, such slivers may come out of the bore and give
rise to unacceptable short-circuits. There is also the
danger of the conductive layers or conductor tracks in a
`25 multi-layer printed circuit board being deformed. The
recess which is provided in the known connection pin in the
press-in portion thereof does not in any way alter that
situation. It enhances the resiliency of the press-in
portion and permits the limhs deining same to move towards
each other when the press-in portion is pressed into the
bore. However, it does not have any influence on the
resiliency of the connection pin in the plane thereof
between the introduction and the press-in portions. The

2~713


1 connection pin remains stiff there. In a further known
connection pin ~U.S. Patent No. 4,776,807) the press-in
portion has three protrusions which are spaced around its
periphery. As a result it no longer bears against the
inside of the bore, with the entire periphery of the press-
in portion, but only along three vertical extending lines.
The risk of cuttings being ~ormed and the danger of
excessiv~ deformation of the material of the printed circuit
board may still occur.
SUMMARY OF THE INVENTION:
Taking that state of the art as its basic starting
point, the invention is based on the problem of designing a
connection pin so that, when it is pushed into a printed
circuit board, cuttings are not scraped off the
metallization of the bore, nor is the material of the
printed circuit board excessively deformed. In a connection
pin of the kind set forth in the openin~ part of this
specification, in accordance with the invention, the
solution to that problem is achieved in that the press-in
portion is preferably of an outside diameter which slightly
decreases conically in a downward direction. At the lower
end of the press-in portion there is a transition region to
the introduction portion. The transition region has a first
portion of decreasing outside diameter, an adjoining second
portion of constant outside diameter, and an adjoining third
portion of a diameter which decreases to the outside
diameter of the introduction portion. The result oE such
configuration of the press-in portion is that, when the
press-in portion is pushed into the printed circuit board,
the material thereof is only gradually compressed and thus
uniformly deformed. In that way the inner layers and
conductor tracks of multi-layer printed circuit boards tend
not to be damaged. The same purpose is served by the
transition region bet~een the introduction and the press-in
portions. With its three portions with first an increasing

20~7~3


1 outside diameter, then a uniform outside diameter and
finally an increasing outside diameter, as viewed in the
direction from the introduction up to the press-in portion,
it further provides that, after initial compacting, during
the insertion o~ the second portion with a uniform outside
diameter, the material of the printed circuit board settles
and experiences further compacting only upon insertion of
the further portion with an outside diameter which again
increases. Such gradual expansion of the bore of the
printed circuit board also means that the metallization
thereof is treated carefully. The metallization is
gradually pressed radially outwardly into the material of
the printed circuit board, without cuttings being formed in
that situation. That means that the material surrounding
the bore, and the metallization thereof, are only compacted
when the COnneGtiOn pin is pressed into position, without
being deformed or forming cuttings.
The outside diameter of the press-in portion
desirably has a conicity of 0.5. The press-in portion
itself is of C-shaped cross-section. The ends of the limbs
of the C-shape, which embrace the recess, are rounded of~.
Desirably they are rounded off both on their inward and on
their outward sides. That avoids excessive pressing
pressures which could occur at ends which converge in a
point~ That arrangement likewise prevents cuttings from
being scraped off the metallization upon a rotary movement
of the connection pin.
The limbs of the C-shape are of a wall thickness
which increases towards their ends. In that axrangement the
inward and outward sides of the ends of the limbs of the C-
shape both desirably e~tend slightly outwardly with an
increase in wall thickness. That means that the C-shape is
narrower and is thus particularly flexible in its central
region between its two limbs. That enhances the resiliency
of the press-in portion when it is pushed into the printed
circuit board.

20~7~3
-4--

1 BRIEF DESCRIPTION OF THE DRAWINGS:
The invention will now be described in further
detail by way of the example of the embodiment illustrated
in the drawing in which:
Figure 1 is a perspective view of ~he cOnneCtiOD
pin.
Figure 2 is a view in longitudinal section of part
of the connection pin r taken along section line II - II in
Fig. 1.
Figure 3 is a side view of the lower xegion of the
connection pin of FigO 2.
Figure 4 is a view in longitudinal section showing
the lower region of the connection pin inserted into a part
of a printed circuit board.
Figure 5 is a view in cross-section taken along
section line V - V in Fig. 4.
Figure 6 is a view in cross-section tak~n along
section line VI - VI in Fig. 4.
Figure 7 is a view in cross-section taken along
section line VII - VII in Fig. 4.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS:
Figure 1 shows the connection pin with its
connection portion 12, its press-in portion 14 and a
transition region 16 comprising first, second and third
portions 1~, 20 and 22, and with its introduction portion
24. The introduction portion 24 is divided into a square
portion 26 and a tip 28. A recess 30 is disposed within the
press-in portion 14, recess 30 having an upper portion 32
and a lower portion 34. The shape of those two portions 32
and 34 corresponds to the shape of the outside walls
enclosing them.
As illustrated, the press-in portion 14 is of
substantially C-shape. The two limbs of the C-shape are
identified by~reference numeral 36 in Figs. 5 through 7.
The ends 38 thereof have rounded configurations 40 at their
outward sides and rounded configurations 42 at their inward

2~6~3
--5--

1 sides. The printed circuit board, into the numerous bores
in which connection pins are pressed, is seen in part in
Figs. 4 through 7 and is identified by reference numeral 44.
The bore for receiving the connection pin 12 is identified
by reference numeral 46. Metallization 48 is provided on
the inside wall thereof. The press-in portion 14 does not
bear a~ainst the metallization 48 or the bore 46 with the
whole of its outside wall, but only at some locations. The
contact points are identified by reference numeral 50.
The connection pin is made from a square starting
metallic material with a cross-section of for example 1 mm~.
In the final condition the outside diameter of the press-in
portion 14 is more than the inside diameter of a bore 46.
The connection pins may be urged into the
lS metallized bores in a printed circuit board by a robot under
the control of a computer, with a force of about 10 kg.
Firstly, the tip 28 and then the square portion 26 pass into
the bore 46. The latter is still not touched. In the
further movement of the connection pin, the third portion 22
then encounters, with its diameter which increases in an
upward direction, the top edge of the bore 46. The bore 46
is gradually enlarged in the further movement of the
connection pin. The second portion 20 then passes with its
uniform diameter into the boxe 46. In further movement, the
material of the printed circuit board can settle and is not
subjected to further deformation. Finally, the first
portion 18 passes with its diameter which increases again,
into the bore 46. The bore 46 is further enlarged. When
the upper end of the first portion 18 reaches the upper edge
of the bore 46, the speed at which the latter is enlarged
has reached a maximum. In Eurther movement of the
connection pin the press-in portion 14 passes into the bore
46. The conicity of 0.5 of the outside wall thereof is
below the conicity of the first portion 18. Therefore, when
3S the press-in portion 14 is passed into the bore 46, the bore

2 ~ 3
o

l is enlarged over a longer period of time, but to a lesser
degree per unit of time. That means ~hat the material of
the printed circuit board including the conductor tracks or
conductive layers disposed therein is neither damaged nor
irregularly deformed. When the press-in portion 14 is
pressed into the bore 46, the limbs 36 of the C-shape also
move towards each other. That also provides careful
- treatment for the material of the printed circuit board 44
and the metallization 4~.
- Figures 4 through 7 show how the press-in portion
14 bears against the inside o~ the bore 46 or the
metallization 48 thereof. As a result of the thickening at
the ends 38 of the limbs 36 of the C-shape and the resulting
relative weakening in the central region which joins the
limbs, the press-in portion 14 contracts radially inwardly
approximately at the halfway position in the height of the
bore 46. Figure 4 shows this condition. The press-in
portion 14 bears against the metallization 48 of the bore 4~
only a short distance below the upper edge and a short
distance above the lower edge of the bore. Figur~ 4 also
shows this condition. The press-in portion 14 is
constricted at its center. That phenomenon is referred to
as a guitar effect. In the two planes in which the press-
in portion 14 bears against the metallization 4~, there is
no line contact but only point contact. Figure 4 and in
particular Figures 5 and 7 show this situation. The press-
in portion 14 only bears against the metallization 46 at
three contact points 50. At the halfway position in terms
of the height of the bore 46, because of the guitar effect,
it even bears against the metallization 48 only at two
contact points 50. That is clearly shown in ~igure 6.
However, the contact of the press-in portion 14 at three
respective contact points 50 in a lower plane and an upper
plane respectively is sufficient for the entire connection
pin to be held in the bore 46 in such a way that it cannot
tilt or turn~ In that respect it is to be noted that the

2~6~13
-7-

1 two ends 38 of the limbs 36 are urged constantly outwardly
against the metallization 48 as a result of the resiliency
of the press-in portion 14.
The true scope of the invention is set forth in
the claims appended hereto.

Dessin représentatif
Une figure unique qui représente un dessin illustrant l'invention.
États administratifs

Pour une meilleure compréhension de l'état de la demande ou brevet qui figure sur cette page, la rubrique Mise en garde , et les descriptions de Brevet , États administratifs , Taxes périodiques et Historique des paiements devraient être consultées.

États administratifs

Titre Date
Date de délivrance prévu Non disponible
(22) Dépôt 1991-11-29
(41) Mise à la disponibilité du public 1992-05-30
Demande morte 1994-05-29

Historique d'abandonnement

Il n'y a pas d'historique d'abandonnement

Historique des paiements

Type de taxes Anniversaire Échéance Montant payé Date payée
Le dépôt d'une demande de brevet 0,00 $ 1991-11-29
Enregistrement de documents 0,00 $ 1993-04-15
Titulaires au dossier

Les titulaires actuels et antérieures au dossier sont affichés en ordre alphabétique.

Titulaires actuels au dossier
BOSE, PETER
THOMAS & BETTS CORPORATION
Titulaires antérieures au dossier
S.O.
Les propriétaires antérieurs qui ne figurent pas dans la liste des « Propriétaires au dossier » apparaîtront dans d'autres documents au dossier.
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Description du
Document 
Date
(yyyy-mm-dd) 
Nombre de pages   Taille de l'image (Ko) 
Dessins représentatifs 1999-07-08 1 10
Description 1992-05-30 7 317
Dessins 1992-05-30 2 68
Revendications 1992-05-30 3 132
Abrégé 1992-05-30 1 19
Page couverture 1992-05-30 1 15