WO2003030306A1 - Press fit pin - Google Patents
Press fit pin Download PDFInfo
- Publication number
- WO2003030306A1 WO2003030306A1 PCT/US2002/031266 US0231266W WO03030306A1 WO 2003030306 A1 WO2003030306 A1 WO 2003030306A1 US 0231266 W US0231266 W US 0231266W WO 03030306 A1 WO03030306 A1 WO 03030306A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- press
- fit pin
- press fit
- hole
- regions
- Prior art date
Links
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 present invention relates to a press fit pin having a press-fitted region to be press-fitted to a conductive through hole of a printed circuit board or other circuit substrate.
- This press fit pin is designed so that, when the press-fitted region is press-fitted to the conductive through hole, outer corner portions of the outer surfaces of the beam-like regions are contacted (pressure-contacted) with the inner wall of the thorough hole while the connection region is deformed.
- the cross-sectional shape of the press fitted region is formed into an M-shape by the beam-like regions and the connection region (see Japanese Patent Examined Publication No. Sho 60-23471).
- the press fit pin of this type is obtained by punching a thin metal plate with die and a punch into a predetermined pin shape, and at the same time molding it into a predetermined cross- sectional shape.
- sharpened portions must be provided both in the die and the punch, which correspond to a portion of a downwardly oriented V-shaped valley in the upper central portion thereof, and portions of upwardly oriented V-shaped valleys in the outer lower side thereof, but these shape portions are liable to be damaged during processing of the press fit pin, and thus the punch and die are lowered in durability.
- a connection region 301 for two beam-like regions 300 and 300 is constructed by a central planar portion 302 extending in a direction substantially perpendicular to the beam-like regions 300 as viewed in a cross-section, and by oblique 303 and 303 extending obliquely outwardly from respective sides of the planar portion 302 and continuous to the respective beam-like regions 300.
- the press fit pin of the related art as shown in Fig. 9 is not so large in deformable capability of the beam-like regions 300, and an adaptable through hole diameter is limited to a small range.
- An object of the present invention is to provide a press fit pin, which can increase the holding force of the press fit pin with respect to a maximum hole diameter of a mating through hole to which the press fit pin is to be inserted, and at the same time that can suppress the stress concentration and the increase of the required insertion force with respect to a minimum hole diameter of the mating through hole, thereby being adaptable to the hole diameters of the conductive through holes in a wider range in comparison with the related art.
- a press fit pin of the present invention adopts the following structure. It has a press-fitted region to be press-fitted and connected to a conductive through hole of a printed circuit board.
- the press-fitted region is formed into substantially an M- shape in cross-section, which has two beam-like regions extending substantially in parallel, and a connection region connecting the beam-like regions in a deformable manner.
- the connection region is formed into such an arcuate shape in cross-section that an upper surface corresponding to a valley side of the M-shape is a concave surface and an opposite lower surface is a convex surface. A part of the upper surface is partially located in the lower surface side with respect to a straight line connecting left and right inner side continuous portions where the lower surface of the connection region and the inner surfaces of the two beam-like regions are continuous to each other.
- the connection region can be deformed easily. Therefore, a dimension between press-fitted portions on the outer surfaces of the two beam-like regions can be set sufficiently large. This makes it possible to increase the holding force of the press fit pin upon its insertion into a through hole with the maximum hole diameter, as well as to suppress the stress concentration on the press fit pin and the increase of the insertion force for the press fit pin in the case of its insertion into a through hole with the minimum hole diameter.
- the most concaved portion at the center of the upper surface corresponding to the valley side of the M-shape is located in the lower surface side with respect to the straight line connecting the left and right inner side continuous portions.
- the two beam-like regions are reduced in thickness so that they can be elastically deformed when press-fitted to the conductive through hole.
- the beam-like regions can be elastically deformed more easily due to the reduced thickness of the beam-like regions.
- each of the beam-like regions is configured such that the stress concentration stemming from the large deformation of the press-fitted region can be dispersed, and that the increase of the insertion force can be suppressed at the same time.
- the radius of curvature of the outer surface of each of the two beam-like regions is set larger than the radius of curvature of the inner wall surface of the conductive through hole.
- each of the two beam-like regions may be substantially equal in radius of curvature to the inner wall surface of the conductive through hole.
- the two beam-like regions are formed such that, when the press-fitted region is press-fitted to the conductive through hole, the outer surfaces of the beam-like regions are pressure-contacted with the inner wall surface of the conductive through hole while the connection region is deformed.
- both of the inner side continuous portions where the inner surfaces of the two beam-like regions and the lower surface of the connection region are continuous to each other is formed as a curved surface.
- most part of the surface of the press- fitted region is formed by the curved surface.
- FIG. 1 is a plane view of a press fit pin according to the present invention
- FIG. 2 is a front view of the press fit pin according to the present invention
- FIG. 3 an enlarged sectional view of a press-fitted region of the press fit pin according to the present invention
- FIG. 4 is an enlarged plane view of a base plate portion and a press-fitted region of the press fit pin according to the present invention
- FIG. 5 is a sectional view taken along a line V-V of Fig. 4;
- FIG. 6 is a partial sectional view showing a relationship between the press fit pin according to the present invention and a printed circuit board having conductive through hole;
- FIG. 7 is a sectional view showing an elastically deformed state of the press-fitted region of the press fit pin according to the present invention with respect to a minimum hole diameter;
- FIG. 8 is a sectional view showing an elastically deformed state of the press-fitted region of the press fit pin according to the present invention with respect to a maximum hole diameter
- FIG. 9 is an enlarged sectional view of a press-fitted region of a press fit pin in a related art.
- a press fit pin 1 shown in these drawings is obtained by punching a thin metal plate with a punch and a die (not shown) and molding it. More specifically, a plurality of press fit pins 1 are manufactured such that they are arranged in parallel on one side of a carrier 2 at given intervals with interconnection bars 3 interposed between them, as shown in Figs. 1 and 2.
- the press fit pin 1 has such a structure that a first pin 5 straightly extends from one side of a rectangular base plate portion 4, and a second pin 7 straightly extends, via a press-fitted region 6 to be press-fitted and connected to a conductive through hole 20 of a printed circuit board B, from the other side of the base plate portion 4. Accordingly, the press fit pin 1 includes the first pin 5, the base plate portion 4, the press-fitted region 6 and the second pin 7 that are concentric to each another.
- the cross-sectional shape of the press-fitted region 6 is shown in Fig. 3. That is, the press- fitted region 6 has such a shape that substantially parallel two beam-like regions 8 are made continuous to a deformable connection region 9.
- the press-fitted region 6 is designed such that, at this time, at least outer corner portions 8a of the respective outer surfaces 81 of the beam-like regions 8 are pressure-contacted with the inner wall surface 21. Accordingly, each of the outer corner portions 8a is formed in an arcuate shape in cross-section. In the outer surface 81 of each beam-like region 8, an outer surface portion between the outer corner portions 8a is formed as a planar surface.
- a feature of this press fit pin 1 resides in the structure of the press-fitted region. As shown in Fig. 3, it is formed in an M-shape in cross-section by the two beam-like regions 8 and the connection region 9.
- the connection region 9 is formed into an arcuate bent portion in cross- section, that has a concave upper surface 9a corresponding to a valley side of the M-shape, and a convex lower surface 9b opposite therefrom. Further, a part of the upper surface 9a is positioned on the lower surface 9b side with respect to a straight line L that connects left and right inner side continuous portions 12 where the lower surface 9b of the connection region 9 and inner surfaces 8b and 8b of the two beam-like regions 8 are continuous to each other.
- connection region 9 can be easily and uniformly deformed elastically.
- the two beam-like regions 8 are reduced in thickness so that they can be elastically deformed when press-fitted to the conductive through hole 20.
- the beam-like regions 8 can be elastically deformed more easily because of the reduced thickness of the beam-like regions 8.
- each of the beam-like regions 8 is configured such that the stress concentration stemming from large deformation of the beam-like regions 8 can be dispersed, and that the increase of the required insertion force can be suppressed at the same time.
- the radius of curvature of the outer surface 81 of each beam-like region 8 is larger than the radius of curvature of the inner wall surface 21 of the conductive through hole 20.
- each beam-like region 8 can be thus effectively brought into tight contact with the inner wall surface 21 of the conductive through hole 20. That is, by pressure-contacting the outer surfaces 81 with the inner wall surface 21 of the conductive through hole 20 while elastically deforming the beam-like regions 8, the holding force of the press fit pin can be increased. To fully exhibit this holding force, a diagonal dimension among the outer corner portions 8a serving as the press-fitted portions must be set to be larger than a hole diameter (the maximum hole diameter) of the conductive through hole 20.
- each beam-like region 8 may be substantially equal in radius of curvature to the inner wall surface 21 of the conductive through hole 20.
- the outer surface 81 of the beam-like region 8 can be tightly contacted with the inner wall surface 21 of the conductive through hole 20 substantially uniformly. This can effectively disperse the stress concentration stemming from large deformation over the entire beam-like region.
- the two-beam-like regions 8 are so constructed that, when the press- fitted region 6 is press-fitted to the conductive through hole 20, as shown in Figs. 7 and 8, mainly the connection region 9 is deformed, while the beam-like regions 8 are also (slightly) deformed so that the outer surfaces 81 of the beam-like regions 8 are pressure-contacted with the inner wall surface 21 of the conductive through hole 20.
- connection region 9 in the case of a conductive through hole 20 having the maximum hole diameter (for example, 0.8mm), mainly the connection region 9 is deformed, and the beam-like regions 8 are also deformed a little so that the outer surfaces 81 are pressure-contacted with the inner wall surface 21 , thereby providing a sufficient holding force.
- the connection region 9 in case of a conductive through hole 20 having the minimum hole diameter (for example, 0.65mm), the connection region 9 is largely deformed, and the entire beam-like regions 8 are also deformed slightly so that the outer surfaces 81 are pressure- contacted with the inner wall surface 21. Therefore the stress is dispersed, while the increase of the required insertion force is suppressed.
- Each of the inner side continuous portions 12 where the inner surfaces 8b of the two beamlike regions 8 and the lower surface 9b of the connection region 9 are continuous to each other is formed as a curved surface. Consequently, most part of the surface of the press-fitted region 6 is formed by the curved surface. This makes it possible to elastically deform the entire press-fitted region 9 substantially uniformly without any partial nonuniformity when the press-fitted region 6 is elastically deformed. Accordingly, also in view of this point, it is possible to enhance the effects of increasing the holding force of the press fit pin, dispersing the stress, reducing the insertion force required, etc.
- Figs. 4 and 5 show, in an enlarged manner, a portion of the press fit pin 1 from the base plate portion 4 to the press-fitted region 6.
- the base plate portion 4 is formed with two dimples (protrusions) 4a protruded from the surface thereof.
- a plurality of lances 4b are formed in edge portions of the base plate 4, which are, for example, to bite into terminal mounting holes of a housing of a connector to mount the press fit pin 1.
- the contact pressures of the outer corner portions 8 a (at four locations) of the beam- like regions 8 against the inner wall of the conductive through hole can be made substantially uniform.
- the obtained insertion force and holding force both fully satisfy the respective target performances such that the insertion force in case of the minimum hole diameter, 0.65mm, is smaller than a desired value, and the holding force in case of the maximum hole diameter, 0.8mm, is larger than a desired value.
Landscapes
- Coupling Device And Connection With Printed Circuit (AREA)
- Multi-Conductor Connections (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/488,717 US6984135B2 (en) | 2001-10-01 | 2002-10-01 | Press fit pin |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-305505 | 2001-10-01 | ||
JP2001305505A JP2003123888A (ja) | 2001-10-01 | 2001-10-01 | プレスフィットピン |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003030306A1 true WO2003030306A1 (en) | 2003-04-10 |
Family
ID=19125284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/031266 WO2003030306A1 (en) | 2001-10-01 | 2002-10-01 | Press fit pin |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP2003123888A (ja) |
CN (1) | CN100499271C (ja) |
TW (1) | TW542468U (ja) |
WO (1) | WO2003030306A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3535074A1 (de) * | 1985-09-27 | 1987-04-09 | Siemens Ag | Kontaktelemente mit einpresszonen |
US4762498A (en) * | 1982-03-20 | 1988-08-09 | Harting Elektronik Gmbh | Pin-shaped contact element to be connected in conductor plate bores |
US4854900A (en) * | 1982-01-19 | 1989-08-08 | Amphenol Corporation | Press fit pin |
US5738550A (en) * | 1994-03-04 | 1998-04-14 | Fujitsu Limited | Press-fit pin fitting in a miniaturized through hole formed in a circuit board |
US6231402B1 (en) * | 1998-04-14 | 2001-05-15 | Nec Corporation | Press-in contact and manufacturing method thereof |
-
2001
- 2001-10-01 JP JP2001305505A patent/JP2003123888A/ja active Pending
-
2002
- 2002-10-01 WO PCT/US2002/031266 patent/WO2003030306A1/en active Application Filing
- 2002-10-01 CN CNB02819280XA patent/CN100499271C/zh not_active Expired - Fee Related
- 2002-10-01 TW TW091215536U patent/TW542468U/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4854900A (en) * | 1982-01-19 | 1989-08-08 | Amphenol Corporation | Press fit pin |
US4762498A (en) * | 1982-03-20 | 1988-08-09 | Harting Elektronik Gmbh | Pin-shaped contact element to be connected in conductor plate bores |
DE3535074A1 (de) * | 1985-09-27 | 1987-04-09 | Siemens Ag | Kontaktelemente mit einpresszonen |
US5738550A (en) * | 1994-03-04 | 1998-04-14 | Fujitsu Limited | Press-fit pin fitting in a miniaturized through hole formed in a circuit board |
US6231402B1 (en) * | 1998-04-14 | 2001-05-15 | Nec Corporation | Press-in contact and manufacturing method thereof |
Also Published As
Publication number | Publication date |
---|---|
CN1561564A (zh) | 2005-01-05 |
CN100499271C (zh) | 2009-06-10 |
JP2003123888A (ja) | 2003-04-25 |
TW542468U (en) | 2003-07-11 |
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