JP3235699B2 - Short pin press-fit terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short pin press-fit terminal, and more particularly to a short pin press-fit terminal having a large short pin holding force by a cap into which a short pin is fitted.

[0002]

2. Description of the Related Art A conventional short pin press-fit terminal will be described with reference to FIG. In FIG. 4, reference numeral 1 denotes a short pin made of a metal material, and 2 denotes a cap made of a synthetic resin insulating material into which the short pin 1 is fitted. Here, the short pin 1 is press-fitted into the cap 2 to form a short pin press-fit terminal. The short pin press-fit terminal is electrically and mechanically connected between the input terminals of the electronic device. It is used to short between children. If the electronic device is operated with a certain input terminal opened, noise may be generated due to this operation. This noise is prevented by short-circuiting the two input terminals with a short pin press-fit terminal. be able to.

[0003] The short pin 1 is formed by punching a conductive sheet metal, and an engagement projection indicated by 13 is formed at an upper intermediate portion on the upper side thereof to constitute a fitting portion. A lower portion is formed with a pair of terminals indicated by 10 to constitute a terminal portion. A groove indicated by 21 into which the short pin 1 is pressed is formed in the cap 2. Reference numeral 22 denotes a wall that forms the groove 21. Cap 2
The width of the groove 21 is formed wider by a than the width of the short pin 1, and the space between the engagement protrusions 13 is wider by b than the width of the groove 21.

When the short pin 1 made of a metal material having such a structure is pressed in the direction of an arrow p and pressed into a cap 2 made of a synthetic resin insulating material, the short pin 1 is positively inserted into the groove 21 and the engagement projection 13 itself. Since the elasticity is not provided, the engaging protrusion 13 is pressed into the groove 21 while shaving off the portion of the wall portion 22 made of the synthetic resin forming the groove 21 as indicated by d in FIG. I do. Here, although the elasticity is not positively applied to the engaging protrusions 13, the wall portion 22 made of a metal material made of a synthetic resin has a slight elasticity. The tip portion can bite into the wall portion 22 forming the groove 21 due to the slight elasticity at the end of the press-fitting.

[0005]

When the short pin 1 is press-fitted into the cap 2 as described above, the engagement projection 13
Is pressed in while shaving off the wall portion 22 forming the groove 21, so that the holding force on the short pin 1 is between the short pins 1 to be manufactured unless the processing dimensional accuracy of the groove 21 and the engagement protrusion 13 is precisely controlled. In this case, variation occurs. As a result, various problems occur in the magnitude of the holding force and its stability. Then, the wall 2 forming the groove 21
6 is cut off by the engagement protrusion 13 to the depth f shown in FIG. 6, so that the depth of the groove 2 biting into the wall portion 22 is only e. In view of the bite depth e itself, since it is extremely small, the relative holding force of the wall portion 22 of the groove 21 to the short pin 1 cannot be increased.

The present invention is to provide a short pin press-fit terminal which has solved the above-mentioned problems.

[0007]

SUMMARY OF THE INVENTION In a short pin press-fit terminal composed of a short pin 1 made of a conductive material and a cap 2 made of an insulating material in which the short pin is fitted and held, the short pin 1 is opposed to a tuning fork. The elastic strip has a fitting portion formed by a pair of elastic strips 12 facing each other and a short-circuit section formed by a contact piece 10 formed integrally with the fitting section, and the elastic strip has an engagement projection 13 formed at an outer intermediate portion thereof. And
The cap 2 is formed at the closed end of the groove corresponding to the groove 21 into which the fitting portion of the short pin 1 is inserted and fitted and the elongated notch 11 formed between the pair of elastic strips 12. A short pin press-fit terminal having the portion 23 was formed.

The tip of the engaging projection 13 constitutes a short pin press-fit terminal formed at an acute angle. Also,
The inside of the distal end portion of the elastic strip 11 is an enlarged portion 14 that expands toward the distal end, and the lower end portions of both sides of the protruding portion 23 are tapered to form a short pin press-fit terminal that is a guide portion 24. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1A and 1B are diagrams illustrating a short pin and a cap to which the short pin is fitted, FIG. 1D illustrates the short pin, FIG. 1B illustrates a view of the cap from below,
(A) is a figure which shows the AA cross section in (b), (c) is a figure which shows CC cross section in (b). FIG. 2 is a diagram illustrating the short pin in detail.

1 and 2, reference numeral 1 denotes a short pin made of a metal material, and reference numeral 2 denotes a cap made of a synthetic resin insulating material into which the short pin 1 is fitted. The short pin 1 can be formed by stamping a conductive sheet metal. Reference numeral 10 denotes a terminal, and a short-circuit portion is formed by a pair of contact pieces 10. Reference numeral 11 denotes an elongated cutout formed at the time of punching, and reference numeral 12 denotes an elastic strip. The elastic strip 12 has an engagement projection indicated by 13 at an outer intermediate portion thereof, and an inner end portion of the elastic strip 12 is an expanding portion 14 which expands toward the tip. The engagement protrusion 13 is configured to gradually increase the width in the direction orthogonal to the length direction of the elastic strip 12 toward the contact piece 10, and has a sharp end at its tip.

The cap 2 has a groove indicated by 21 into which the short pin 1 is press-fitted. Reference numeral 22 denotes a wall that forms the groove 21. Reference numeral 23 denotes a protruding portion formed at the innermost closed end of the groove 21. Both sides of the lower end of the protruding portion 23 are tapered to serve as guide portions indicated by 24.
The width of the protruding portion 23 is configured to be larger by i than the width of the above-described elongated cutout portion 11, that is, the distance between the inner portions of the elastic strip 12.

In the short pin press-fit terminal of the present invention, the short pin formed by punching out the conductive sheet metal has a pair of elastic thin strips opposed to each other in the shape of a tuning fork by forming the thin slits 11 as described above. The elastic strip 12 is fitted into the groove 21,
A configuration is adopted in which the distal end of the elastic strip 12 is press-fitted to the protruding portion 23 formed at the innermost closed end of the groove 21.

Referring to FIG. 3 (a), when the short pin 1 is press-fitted into the cap 2, a pair of elastic strips 12 of the short pin 1 are inserted into the groove 21 of the cap 2 in the direction of the arrow p. At the time of press-fitting, first, the elastic strip 12 is pressed and deformed inward in the direction of arrow j due to the engagement protrusion 13 engaging with the opening end of the groove 21 and being pressed in the direction of arrow p. Therefore, the engagement protrusion 13 is also deformed inward, and the amount of the engagement protrusion 13 shaving off the wall 22 of the groove 21 is greatly reduced as compared with f in the conventional example. As a result, the short pin 1 can be easily pressed into the groove 21. FIG. 3B shows that the press-fitting of the engagement protrusion 13 into the groove 21 progresses so that the tip of the elastic strip 12 reaches the protrusion 23 formed at the innermost closed end of the groove 21, and the expanding part 14 is moved. The state where it contacted the guide part 24 is shown. Then, as shown in FIG. 3 (c), in the final stroke of the press-fitting, the distal end of the elastic strip 12 is formed so that the expanding portion 14 formed thereon is guided by the guiding portion 24 of the projecting portion 23. Press fit. At this time, since the elastic strip 12 is now strongly pressed outward in the direction of arrow k and expanded, the engaging projection 13 is strongly pressed against the wall 22 of the groove 21 and bites deeply into the short pin 1. Can not be permanently removed from the cap 2 and is strongly retained.

[0014]

As described above, the short pin 1 of the short pin press-fitting terminal according to the present invention has the elongated notch 1
1 are formed to form a pair of elastic strips 12 facing each other like a tuning fork. The elastic strips 12 are fitted into the grooves 21 and the protrusions 23 formed at the innermost closed end of the grooves 21. A configuration is adopted in which the distal end portion of the elastic strip 12 is press-fitted. By doing so, the engaging projection 13 engages with the opening end of the groove 21 and the elastic strip 12 is pressed and deformed inward. As a result, the engaging projection 13 is formed of the synthetic resin of the groove 21. The amount of scraping 22 is f
As a result, the short pin 1 can be easily pressed into the cap 2. Then, in the final stroke of the press-fitting, the distal end of the elastic strip 12 is press-fitted into the protruding portion 23. At this time, the elastic strip 12 is strongly pressed outward and expanded, so that the engaging projection 13 is formed in the groove 21. The short pin 1 is deeply pressed against the wall portion 22 made of the synthetic resin of the above, and the short pin 1 never gets out of the cap 2 and is strongly held.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams illustrating an example, in which FIG. 1A is a diagram showing a cross section taken along line AA in FIG. 1B, FIG. 1B is a diagram of the cap viewed from below, and FIG. FIG.
(D) is a diagram showing a short pin.

FIG. 2 is a diagram illustrating an example.

FIG. 3 is a diagram for explaining a press-fitting operation of the embodiment;
(A) is a diagram showing a state where the press-fitting of the press-fitting terminal is started,
(B) is a figure which shows the point where the front-end | tip part of the elastic strip | piece 12 reached the protrusion part 23, (c) is a figure which shows the state by press-fitting.

FIG. 4 is a diagram illustrating a conventional example.

FIG. 5 is a diagram illustrating a press-fitting state of a conventional example.

FIG. 6 is a diagram for explaining a shaved amount and a biting depth in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Short pin 2 Cap 10 Contact piece 11 Slender cutout part 12 Elastic slender piece 13 Engagement projection 14 Expanding part 21 Groove 23 Projection part 24 Guide part

Claims (3)

(57) [Claims] 1. A short pin press-fit terminal comprising a short pin made of a conductive material and a cap made of an insulating material in which the short pin is fitted and held, wherein the short pin is formed by a pair of elastic strips opposed to each other in a tuning fork shape. The elastic strip has an engaging projection formed at an outer middle portion thereof, and the cap has a short pin fitting portion. Characterized in that it has a groove into which is inserted and fitted, and a protruding portion formed at the closed end of the groove corresponding to the elongated notch formed between the pair of elastic strips. Press-fit terminal. 2. The short pin press-fit terminal according to claim 1, wherein the tip of the engagement projection is formed at an acute angle. 3. The short pin press-fit terminal according to claim 1, wherein the inside of the distal end portion of the elastic strip is an expanded portion that expands toward the distal end and the protruding portion. A short pin press-fit terminal, characterized in that both lower ends are tapered on both sides to form guide portions.