JPS61138475A - Electric contact pin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrical contact pin, and more particularly to an electrical contact pin having an intermediate mounting portion for mechanically securing and electrically connecting to a through-hole portion of a printed circuit board.

[Conventional technology]

Conventionally, as shown in FIGS. 4A and 4B, this electrical contact pin has a tip 1, an insertion taper s2, and an intermediate mounting portion 3 that is fitted and fixed into a through-hole portion of a printed circuit board.
Triangular grooves 4 are provided on the two opposite corners adjacent to the diagonal corner portions 5 of the intermediate mounting portion 30, extending to a position past the insertion taper portion 2. These grooves 4 are alternately arranged facing each other. A chamfer 6 is formed on the diagonal corner of the intermediate attachment part 3 that is different from the corner part 5.

[Problem that the invention seeks to solve]

In such a conventional electrical contact pin, as shown in FIG. 4C, the corner portion 5 of the intermediate mounting portion 3 has elasticity in the diagonal direction due to the function of the groove portion 4, so that the inner diameter of the through-hole portion 23 into which it is inserted is It has become possible to deal with differences to some extent. However, the inner diameter of the through-hole portion of printed circuit boards for high-density mounting, such as those used in computers, is usually 0.8 mm.
However, other electronic devices still require through-holes with large inner diameters, such as 1.1 mm in diameter, so through-holes over a wider range are required. There is a need for an electrical contact pin that can accommodate different hole inner diameters. However, in the conventional electrical contact pin as described above, there is a limit to the range of the inner diameter of the through-hole part that can absorb the contact force with the through-hole part and the diagonal displacement of the corner part 5 of the intermediate mounting part 3. This resulted in the disadvantage that two types of electrical contact pins, one for small diameter and one for large diameter, had to be prepared.

In addition, the groove portion 4 is extended at a position past the insertion taper portion 2 at 1 so that the insertion taper portion 2 that first contacts the through-hole portion 23 also has elasticity in its diagonal direction. The wall thickness between the insertion taper part 2 and the groove part 4 is thin, and there is a drawback that it is easy to break when external force is applied.

Further, the groove portion 4 of the electrical contact pin constructed in this way is usually formed by pressing only once, but since the dimensional accuracy is not good with that method, it is difficult to obtain the necessary dimensions.
There was a drawback that the insertion force into the through hole, contact performance, and retention force varied depending on the completed electrical contact pin.

[Means for solving problems]

The electrical contact pin of the present invention has a tip portion that is inserted into a through-hole portion of a printed circuit board, an intermediate attachment portion that contacts and is fixed to the through-hole portion, and a diameter that extends from the tip portion to the intermediate attachment portion. an electrical contact pin having an insertion taper portion having an inclined surface provided to increase the diameter of the electrical contact pin; A groove provided to the middle of the insertion taper part, an expanded groove in which the opening width of at least a part of the groove is widened, and a diagonal corner different from the diagonal corner adjacent to the groove. It is characterized by having a chamfer provided therein.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIGS. 1A and 1B, which show an embodiment of the present invention, the electrical contact pin 31 of the present invention has a tip 7 that is connected to a through-hole portion of a printed circuit board, and a tip portion 7 that contacts the through-hole portion. and an insertion tapered portion 8 having an inclined surface whose diameter increases from the distal end portion 7 toward the intermediate attachment portion 9. Diagonal corner part 1 from the intermediate mounting part 9 to the middle of the insertion taper part 8
On two opposing surfaces adjacent to 2, alternately opposing grooves 1
0 is provided, and a part of the center of the groove 10 is an expanded groove 11 having an opening wider than the groove 10. Moreover, a chamfer 13 is provided on a diagonal corner portion of the intermediate attachment portion 9 that is different from the corner portion 12 . The expansion groove 11 provided in a part of the groove 10 expands the range of diagonal displacement of the intermediate attachment part 9, so that a wider range of through-hole inner diameters can be accommodated. Furthermore, since the groove portion 10 is provided only up to the middle of the insertion taper portion 8, if the position where the insertion taper portion 8 first contacts the through-hole portion is a position where the groove portion 10 is not provided, the insertion taper portion 8 does not have sufficient elasticity and may damage the through-hole section. In order to prevent this, the facing portion 14 is provided in the matcher taper portion 8 so that the position where it first comes into contact with the through hole portion is at a position where it has flexibility due to the action of the groove portion 10. However, this imposition part 14 is
If the portion of the insertion tapered portion 8 that first comes into contact with the through-hole portion has sufficient elasticity, it is not necessary to provide it.

To obtain the electrical contact pin 31 as described above, first the second A
A groove 10 is formed by pressing the two opposing surfaces of the electrical contact pin with a coin punch 15 as shown in the figure, and then a part of the groove 10 is completely spanned with an expansion punch 16 as shown in FIG. 2B. One possible method is to perform expansion processing. Forming the expanded groove portion 11 by pressing twice in this manner has the advantage that the necessary diagonal dimensions can be obtained with high precision.

In addition, if the same printed circuit board 20 has through-holes 21 and 22 of different diameters as shown in FIG. Groove 1 with coining punch 15
0 is formed, and in the subsequent second step, for example, a counter and a press processing machine are connected, and the electric contact bottle in which the groove portion 10 is formed is selectively expanded into an expansion hole according to the inner diameter of the corresponding through-hole portion. The electric contact bottle 30 having only the groove part 10 shouldering the electric contact bottle 30 and the electric contact bottle 3 having the enlarged groove part 11 are formed by pressing with the groove 16 to form the expanded groove part 11.
1 can be mixed on the same carrier 17.

Further, the insertion taper part 80 and the surfaced part 14 are arranged so that the outer diameter on the diagonal of the insertion taper m8 at that position is approximately equal to the inner diameter of the through-hole part 21 having the minimum inner diameter, or is slightly smaller than 7'L. If provided, no damage will be caused to the through-hole portion of any inner diameter during insertion.

〔Effect of the invention〕

As explained above, in the present invention, at least a part of the groove provided in the intermediate attachment part of the electrical contact bottle is an expanded groove having an opening width wider than this groove, and the intermediate attachment part makes contact with the through-hole part of the printed board. By increasing the outer diameter of the diagonal corner portions, it is possible to obtain an electrical contact bottle that can be used with a single type of through-hole portion having a wide range of inner diameters.

[Brief explanation of the drawing]

FIG. 1A is a perspective view of one embodiment of the present invention, and FIG. 1B is a perspective view of an embodiment of the present invention.
A sectional view of the intermediate attachment part in Figure A, Figure 2A and Figure 2
Figure B is a perspective view of a coining punch and an expansion punch, respectively. Figure 3 is a plan view showing an electric contact pin connected by a carrier and a printed circuit board having through holes of different diameters. Figure 4A is a conventional electric contact pin. Perspective view of 4th
Figure B is a cross-sectional view of the intermediate mounting portion in Figure 4A, and Figure 4C is a cross-sectional view of the electrical contact bottle of Figure 4A inserted into the through-hole portion of the printed circuit board. 1...Tip part, 2...Insertion taper part, 3...Intermediate mounting part, 4...Groove part, 5
... Corner part, 6 ... Chamfer, 7.
...Tip part, 8...Insertion taper part, 9
......Intermediate mounting part, 10...Groove part, 11
...Expansion groove part, 12...Corner part,
13... Chamfer, 14... Imposed part, 1
5... Coining punch, 16... Expansion punch, 17... Carrier, 20...
- Printed circuit board, 21, 22, 23... Through-hole section, 30.31... Electrical contact bottle. Figure 1A Figure IB

Claims (2)

[Claims] (1) A distal end portion to be inserted into a through-hole portion of a printed circuit board, an intermediate mounting portion that contacts and is fixed to the through-hole portion, and a diameter increasing from the distal end portion toward the intermediate mounting portion. In the electrical contact pin, the insertion tapered portion has an intermediate insertion tapered portion adjacent to a diagonal corner portion of the intermediate attachment portion on at least two opposing surfaces of the intermediate attachment portion. an expanded groove in which the opening width of at least a portion of the groove is widened, and a chamfer provided in a diagonal corner different from the diagonal corner adjacent to the groove. An electrical contact pin characterized by: (2) The electrical contact pin according to claim 1, characterized in that a surfaced portion is provided with an outer diameter that is equal to or less than the inner diameter of the minimum diameter through-hole portion inserted into the insertion taper portion. electrical contact pins.