JPS5814582Y2 - Electrical component holding structure - Google Patents

Description

[Detailed Description of the Invention] This invention is used for small coils such as intermediate frequency transformers and other small electrical parts, and particularly relates to a holding structure for electrical parts having a cylindrical terminal pin that prevents removal.

A conventional cylindrical terminal pin is connected to a substrate 11 as shown in FIG.
When the terminal pin 13 is inserted into the terminal insertion hole 12 formed in the terminal insertion hole 12, a crushed part 14 is formed by crushing the middle part of the terminal pin 13 to prevent the terminal pin 13 from being removed.
4 was made slightly larger than the diameter of the terminal insertion hole 12, the terminal pin 13 was pushed into the terminal insertion hole 12, and the crushed portion 14 was positioned at an intermediate position.

Or, as shown in Fig. 2, crush the terminal pin 13 with the crushed portion 1.
Two terminal pins 4 a and 14 b were made, and the crushed portions 14 a and 14 b of the terminal pin 13 passed through the insertion hole 12 were positioned at both ends of the insertion hole 12 so that the board 11 was held therebetween.

As described above, the conventional crushed portion 14 for preventing removal is simply flattened a part of the terminal pin, and its width W varies relatively widely.On the other hand, the terminal insertion hole 12 Because the diameter of the terminal pins varies, the terminal pins may be inserted too loosely or too tightly, resulting in poor yields.

Particularly in devices that automatically insert terminal pins onto the board, if there is a slight misalignment between the terminal pins 13 and the terminal insertion holes 12, problems such as self-insertion becoming difficult or the orientation of the terminals changing may occur. there were.

From this point of view, it is more convenient to make the diameter of the terminal insertion hole 12 somewhat thicker.

However, if the terminal insertion hole 12 is made larger, there is a risk that the terminal pin 13 will become too loose and fall out, as described above, and it has not been possible to provide sufficient margin for the terminal insertion hole 12.

Therefore, when the terminal pins are automatically inserted into the insertion holes, the yield is poor.

In order to solve these problems, this invention prevents the terminal pin from being pulled out and allows the width of the bulging part to be elastically deformed to prevent variations in the precision of the diameter of the terminal insertion hole and misalignment between the terminal pin and the insertion hole. To provide a terminal pin for an electrical component which is capable of absorbing a large amount of water and also has a reliable function of preventing removal.

For example, as shown in the drawings from FIG. 3 onwards, in this invention, a crack 16 with a width sufficiently small compared to the diameter of the cylindrical terminal pin is formed in the middle part of the cylindrical terminal pin along the longitudinal direction of the terminal pin 13. The parts on both sides of the crack 16 are bent outward in opposite directions to form bulges 17 and 1.
It is considered to be 8.

These bulging portions are curved outward along the forming surface of the crack 16 so as to separate from each other at their intermediate portions.

Therefore, these bulges are configured to be elastically deflectable at right angles to the longitudinal direction of the pin 13.

The bulging portions 17 and 18 for preventing extraction may be curved to both sides after the crack 16 is formed, or may be formed simultaneously with the formation of the crack.

The width W1 between the outer sides of the mutually distant parts of the bulges 17 and 18 is made larger than the diameter of the terminal pin insertion hole 12 through which the bulges are inserted.

When this terminal pin is inserted into the terminal insertion hole 12 of the board, the width of the bulge 17, 18 is elastically reduced to the width W2 of the diameter of the terminal insertion hole 12 as shown in FIG. 7 due to its elasticity.
In the case of FIG. 1, the coil C is held at an intermediate position of the terminal insertion hole 12, and more specifically, as shown in FIG. It is held elastically by the projections 17,18.

In the case of FIG. 2, it is pushed out and elastically restored to Wl again, specifically at the end position of the terminal insertion hole 12 formed in the substrate 11 as shown in FIG. ,
For example, the coil C is held elastically by a portion of the retaining bulge 17,18.

In this manner, in the terminal pin of this invention, the width of the bulging portions 17 and 18 that prevent the pin from being pulled out can be elastically changed, and the variation in the width is determined by taking into account the variation in the diameter of the terminal insertion hole. If the width is selected, it can be elastically reduced during insertion, so it will not be too loose or too tight, and the variation in error will be absorbed, resulting in a better yield.

In particular, when automatically inserting a terminal pin into an insertion hole, even if the diameter of the insertion hole is made relatively large, it will not become too loose and will act to prevent the terminal pin from being removed. Even if the terminal pin is slightly misaligned, the terminal pin can be easily inserted into the insertion hole.

Furthermore, due to the elastic action of the bulge during insertion, the insertion can be made relatively smoothly under appropriate frictional resistance, and the insertion force can be equalized.

Further, in conventional terminal pins, the crushed portion is flat and thin, so it is easy to break at this position, but the terminal pin according to the present invention does not have such a problem, and has a high yield in this respect as well.

In the figure, this invention is applied to a terminal pin having a circular cross-section, but the cross-sectional shape may also be square.

Further, this invention is applied only when inserting a terminal pin into a wiring board, etc., and a conventional terminal having a crushed portion may be used as a terminal to be embedded in a board.

[Brief explanation of drawings]

1 and 2 are diagrams showing the relationship between a conventional terminal pin and a board, respectively, FIG. 3 is a front view showing an example of the terminal pin according to this invention, FIG. 4 is a side view thereof, and FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 3, FIG. 6 is a perspective view of the cut terminal in FIG. 5, and FIG. 8 and 9 are diagrams showing a state in which an electrical component is held and attached to a board by terminal pins of the electrical component according to this invention. 13: terminal pin, 16: crack, 17, 18: bulge to prevent removal.

Claims (1)

[Scope of utility model registration request] In an electrical component holding structure in which an electrical component is held on the board by inserting a terminal pin into a terminal insertion hole formed in a board, the terminal pin is formed in a cylindrical shape, and a middle portion of the cylindrical pin is provided. A crack with a width sufficiently small compared to the diameter of the cylindrical pin is formed along the longitudinal direction, and parts on both sides of the crack are bent outward to form a bulge to prevent the pin from being pulled out. The retaining bulge can be elastically deflected at right angles to the longitudinal direction, and when the electrical component is held and attached to the board, the retaining bulge extends in the longitudinal direction of the cylindrical pin. An electrical component holding structure configured to elastically contract in a direction perpendicular to the terminal insertion hole so that at least a portion thereof elastically engages with the inner circumferential surface of the terminal insertion hole.