EP0488487A1 - Press-fit connection pin - Google Patents
Press-fit connection pin Download PDFInfo
- Publication number
- EP0488487A1 EP0488487A1 EP91250319A EP91250319A EP0488487A1 EP 0488487 A1 EP0488487 A1 EP 0488487A1 EP 91250319 A EP91250319 A EP 91250319A EP 91250319 A EP91250319 A EP 91250319A EP 0488487 A1 EP0488487 A1 EP 0488487A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- connection pin
- section
- bore
- pin according
- 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.)
- Granted
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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
Definitions
- the invention concerns a connection pin for insertion into a through-metallized bore in a printed circuit board.
- connection pins of the press-fit kind are known for what is referred to as the solder-free connection procedure.
- a known connection pin German patent specification No. 2,937,883
- the press-in portion is cylindrical and the introduction portion is conical. 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 press-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.
- 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 limbs defining 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 connection pin remains stiff there.
- 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 formed and the danger of excessive deformation of the material of the printed circuit board may still occur.
- connection pin a connection pin of the kind set forth in the opening 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 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 off. 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.
- the inward and outward sides of the ends of the limbs of the C-shape both desirably extend 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.
- 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 18, 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.
- 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 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 against 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.
- connection pin is made from a square starting metallic material with a cross-section of for example 1 mm2. In the final condition the outside diameter of the press-in portion 14 is more than the inside diameter of a bore 46.
- connection pins may be urged into the metallized bores in a printed circuit board by a robot under the control of a computer, with a force of about 10 kg.
- the tip 28 and then the square portion 26 pass into the bore 46. The latter is still not touched.
- 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 bore 46.
- the material of the printed circuit board can settle and is not subjected to further deformation.
- the first portion 18 passes with its diameter which increases again, into the bore 46.
- the bore 46 is further enlarged.
- 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 the press-in portion 14 is passed into the bore 46, the bore is enlarged over a longer period of time, but to a lesser degree per unit of time. That means that the material of the printed circuit board including the conductor tracks or conductive layers disposed therein is neither damaged nor irregularly deformed.
- 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 48.
- Figures 4 through 7 show how the press-in portion 14 bears against the inside of the bore 46 or the metallization 48 thereof.
- 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 46 only a short distance below the upper edge and a short distance above the lower edge of the bore.
- Figure 4 also shows this condition.
- the press-in portion 14 is constricted at its center. That phenomenon is referred to as a guitar effect.
Abstract
Description
- The invention concerns a connection pin for insertion into a through-metallized bore in a printed circuit board.
- 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 press-in portion is cylindrical and the introduction portion is conical. 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 press-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 happens, however, 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 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 limbs defining 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 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 formed and the danger of excessive deformation of the material of the printed circuit board may still occur.
- 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 opening 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 of 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 between the introduction and the press-in portions. With its three portions with first an increasing 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 of 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 connection 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 off. 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 arrangement the inward and outward sides of the ends of the limbs of the C-shape both desirably extend 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.
- 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 the connection pin.
- Figure 2 is a view in longitudinal section of part of the connection pin, taken along section line II - II in Fig. 1.
- Figure 3 is a side view of the lower region of the connection pin of Fig. 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 taken 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.
- Figure 1 shows the connection pin with its
connection portion 12, its press-inportion 14 and atransition region 16 comprising first, second andthird portions introduction portion 24. Theintroduction portion 24 is divided into asquare portion 26 and atip 28. Arecess 30 is disposed within the press-inportion 14, recess 30 having anupper portion 32 and alower portion 34. The shape of those twoportions - As illustrated, the press-in
portion 14 is of substantially C-shape. The two limbs of the C-shape are identified byreference numeral 36 in Figs. 5 through 7. Theends 38 thereof haverounded configurations 40 at their outward sides androunded configurations 42 at their inward 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 byreference numeral 44. The bore for receiving theconnection pin 12 is identified byreference numeral 46.Metallization 48 is provided on the inside wall thereof. The press-inportion 14 does not bear against themetallization 48 or thebore 46 with the whole of its outside wall, but only at some locations. The contact points are identified byreference numeral 50. - The connection pin is made from a square starting metallic material with a cross-section of for example 1 mm². In the final condition the outside diameter of the press-in
portion 14 is more than the inside diameter of abore 46. - The connection pins may be urged into the 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 thesquare portion 26 pass into thebore 46. The latter is still not touched. In the further movement of the connection pin, thethird portion 22 then encounters, with its diameter which increases in an upward direction, the top edge of thebore 46. Thebore 46 is gradually enlarged in the further movement of the connection pin. Thesecond portion 20 then passes with its uniform diameter into thebore 46. In further movement, the material of the printed circuit board can settle and is not subjected to further deformation. Finally, thefirst portion 18 passes with its diameter which increases again, into thebore 46. Thebore 46 is further enlarged. When the upper end of thefirst portion 18 reaches the upper edge of thebore 46, the speed at which the latter is enlarged has reached a maximum. In further movement of the connection pin the press-inportion 14 passes into thebore 46. The conicity of 0.5° of the outside wall thereof is below the conicity of thefirst portion 18. Therefore, when the press-inportion 14 is passed into thebore 46, the bore is enlarged over a longer period of time, but to a lesser degree per unit of time. That means that 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-inportion 14 is pressed into thebore 46, thelimbs 36 of the C-shape also move towards each other. That also provides careful treatment for the material of the printedcircuit board 44 and themetallization 48. - Figures 4 through 7 show how the press-in
portion 14 bears against the inside of thebore 46 or themetallization 48 thereof. As a result of the thickening at theends 38 of thelimbs 36 of the C-shape and the resulting relative weakening in the central region which joins the limbs, the press-inportion 14 contracts radially inwardly approximately at the halfway position in the height of thebore 46. Figure 4 shows this condition. The press-inportion 14 bears against themetallization 48 of thebore 46 only a short distance below the upper edge and a short distance above the lower edge of the bore. Figure 4 also shows this condition. The press-inportion 14 is constricted at its center. That phenomenon is referred to as a guitar effect. In the two planes in which the press-inportion 14 bears against themetallization 48, there is no line contact but only point contact. Figure 4 and in particular Figures 5 and 7 show this situation. The press-inportion 14 only bears against themetallization 46 at three contact points 50. At the halfway position in terms of the height of thebore 46, because of the guitar effect, it even bears against themetallization 48 only at two contact points 50. That is clearly shown in Figure 6. However, the contact of the press-inportion 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 thebore 46 in such a way that it cannot tilt or turn. In that respect it is to be noted that the two ends 38 of thelimbs 36 are urged constantly outwardly against themetallization 48 as a result of the resiliency of the press-inportion 14. - The true scope of the invention is set forth in the claims appended hereto.
Claims (7)
- 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.
- 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.
- A connection pin according to claim 2, wherein said press-in portion has a generally cylindrical outer configuration.
- 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.
- 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.
- 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.
- A connection pin according to claim 6, wherein said cross-section of said introduction portion is substantially rectangular.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9016257U DE9016257U1 (en) | 1990-11-29 | 1990-11-29 | |
DE9016257U | 1990-11-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0488487A1 true EP0488487A1 (en) | 1992-06-03 |
EP0488487B1 EP0488487B1 (en) | 1995-04-05 |
Family
ID=6859828
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91250319A Expired - Lifetime EP0488487B1 (en) | 1990-11-29 | 1991-11-27 | Press-fit connection pin |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0488487B1 (en) |
JP (1) | JP2718585B2 (en) |
AU (1) | AU642555B2 (en) |
CA (1) | CA2056713A1 (en) |
DE (2) | DE9016257U1 (en) |
ES (1) | ES2070422T3 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5599213A (en) * | 1994-01-11 | 1997-02-04 | Itt Cannon Electric Gmbh | Contact spring arrangement |
DE19545481A1 (en) * | 1995-12-06 | 1997-06-12 | Ge Tronic Geislinger Electroni | Electronic device fitted with several HF terminals |
EP1420479A1 (en) * | 2002-11-13 | 2004-05-19 | Tyco Electronics AMP GmbH | Plug connection device |
US6979234B2 (en) | 2002-11-13 | 2005-12-27 | Tyco Electronics Amp Gmbh | Plug connection device |
US9356367B2 (en) | 2014-01-08 | 2016-05-31 | Tyco Electronics Corporation | Electrical connector having compliant contacts and a circuit board assembly including the same |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015200491A1 (en) * | 2015-01-14 | 2016-07-14 | Robert Bosch Gmbh | Press-in contact with a einrollbar formed Einpresszone |
DE102017100724A1 (en) | 2017-01-16 | 2018-07-19 | Ludger Sorig | Electrical press-fit contact element |
WO2021106546A1 (en) * | 2019-11-29 | 2021-06-03 | 株式会社オートネットワーク技術研究所 | Press-fit terminal, substrate with press-fit terminal, and device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986004743A1 (en) * | 1985-02-05 | 1986-08-14 | North American Specialties Corporation | Compliant connector |
EP0225400A1 (en) * | 1985-12-11 | 1987-06-16 | Burndy Electra N.V. | Contact pin |
EP0257746A1 (en) * | 1986-07-10 | 1988-03-02 | Amp Incorporated | Printed circuit board connector |
US4776807A (en) * | 1983-09-06 | 1988-10-11 | Methode Electronics, Inc. | Compliant contact |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU565072B2 (en) * | 1982-05-24 | 1987-09-03 | Amp Incorporated | Contact element |
EP0134094B1 (en) * | 1983-08-15 | 1987-05-27 | AMP INCORPORATED (a New Jersey corporation) | An improved compliant section for circuit board contact elements |
ATE32155T1 (en) * | 1983-09-30 | 1988-02-15 | Siemens Ag | FLAT ASSEMBLY. |
GB8516610D0 (en) * | 1985-07-01 | 1985-08-07 | Bicc Plc | Electrical contact |
CH675929A5 (en) * | 1988-05-06 | 1990-11-15 | Cdm Connectors Dev & Mfg Ag |
-
1990
- 1990-11-29 DE DE9016257U patent/DE9016257U1/de not_active Expired - Lifetime
-
1991
- 1991-11-27 DE DE69108685T patent/DE69108685T2/en not_active Expired - Fee Related
- 1991-11-27 AU AU88198/91A patent/AU642555B2/en not_active Ceased
- 1991-11-27 EP EP91250319A patent/EP0488487B1/en not_active Expired - Lifetime
- 1991-11-27 ES ES91250319T patent/ES2070422T3/en not_active Expired - Lifetime
- 1991-11-29 JP JP3316479A patent/JP2718585B2/en not_active Expired - Fee Related
- 1991-11-29 CA CA002056713A patent/CA2056713A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4776807A (en) * | 1983-09-06 | 1988-10-11 | Methode Electronics, Inc. | Compliant contact |
WO1986004743A1 (en) * | 1985-02-05 | 1986-08-14 | North American Specialties Corporation | Compliant connector |
EP0225400A1 (en) * | 1985-12-11 | 1987-06-16 | Burndy Electra N.V. | Contact pin |
EP0257746A1 (en) * | 1986-07-10 | 1988-03-02 | Amp Incorporated | Printed circuit board connector |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5599213A (en) * | 1994-01-11 | 1997-02-04 | Itt Cannon Electric Gmbh | Contact spring arrangement |
DE19545481A1 (en) * | 1995-12-06 | 1997-06-12 | Ge Tronic Geislinger Electroni | Electronic device fitted with several HF terminals |
EP1420479A1 (en) * | 2002-11-13 | 2004-05-19 | Tyco Electronics AMP GmbH | Plug connection device |
US6979234B2 (en) | 2002-11-13 | 2005-12-27 | Tyco Electronics Amp Gmbh | Plug connection device |
US9356367B2 (en) | 2014-01-08 | 2016-05-31 | Tyco Electronics Corporation | Electrical connector having compliant contacts and a circuit board assembly including the same |
Also Published As
Publication number | Publication date |
---|---|
DE69108685D1 (en) | 1995-05-11 |
AU642555B2 (en) | 1993-10-21 |
ES2070422T3 (en) | 1995-06-01 |
CA2056713A1 (en) | 1992-05-30 |
JP2718585B2 (en) | 1998-02-25 |
AU8819891A (en) | 1992-06-04 |
JPH04269472A (en) | 1992-09-25 |
EP0488487B1 (en) | 1995-04-05 |
DE69108685T2 (en) | 1995-08-17 |
DE9016257U1 (en) | 1991-04-04 |
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