JP2005259503A - Press fit terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press fit terminal in which twisting of the terminal at the time of pressing in a through hole is prevented. <P>SOLUTION: The press fit terminal 11 has a pressure contact part 14 of cross-sectionally N shape by coupling the contact parts 15a, 15b on both sides with a coupling part 16 of inclined shape. A twist regulating part which prevents twisting of a prescribed direction acting on the contact parts 15a, 15b accompanying the elastic deformation of the coupling part 16 is provided on the outside of the contact parts 15a, 15b. As a twist regulating part, a groove or a projection of inclined shape is provided on the outside of the contact part 15a, 15b in order to give a rotation force of opposite direction to the twisting direction of the press fit terminal 11, and thereby, twisting acting on the pressure contact part 14 is set off. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a press-fit terminal, and in particular, to prevent the press-fit terminal from being twisted during press-fitting into a through hole.

Conventionally, as a terminal used to establish electrical connection with a contact portion that is inserted into a through hole of a printed circuit board and formed on the inner periphery of the printed circuit board, the contact is made by press-fitting the through hole without soldering. A press-fit terminal that is fixed is known. As an example, the device described in Patent Document 1 is also referred to as an N type as shown in FIGS. 5A and 5B, and the pair of contact portions 2a and 2b are connected in an inclined manner. By bridging at the portion 3, the cross-section is N-shaped (Z-shaped), and bulges outward to be elastically deformable in the radial direction. The press-fit terminal 1 is inserted into the through hole of the printed circuit board while being elastically deformed so that the contact portions 2a and 2b on both sides are closed inward via the connecting portion 3, and the elastic force in the opening direction is inserted. It is pressed against the inner peripheral surface of the through hole by the generated force to prevent it from coming off and to be electrically connected to the contact portion of the through hole.
JP 58-189970 A

  However, the press-fit terminal 1 having the above-described configuration is twisted in the required direction when the press-fit terminal 1 is press-fitted into the through hole because the contact portions 2a and 2b on both sides are bridged by the connecting section 3 having an inclined cross section. Occurs. That is, the contact portions 2a and 2b on both sides have a point-symmetric structure with respect to the center point P of the connecting portion 3, and therefore when the contact portions 2a and 2b are pressed toward the center, the connecting portion 3 Rotates in the A direction with the center point P as a fulcrum to allow this deformation. As a result, circumferential twist associated with the rotation of the press-fit terminal 1 occurs in the through hole, and due to this distortion, the contact pressure of the elastic contact portions 2a and 2b with respect to the through hole becomes insufficient, and the contact reliability There was a risk that the property would be lowered.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a press-fit terminal having a structure in which the press-fit terminal is not twisted when inserted into a through hole.

In order to solve the above-mentioned problem, a press-contact portion that can be brought into electrical contact with a contact portion formed on the inner periphery of the through-hole by being press-fitted into the through-hole of the printed circuit board is provided. A pair of abutting portions bulging on both sides to be in contact with each other, and a connecting portion that connects the abutting portions with an inclined cross section, and the connecting portion when the press contact portion is inserted into the through hole In a press-fit terminal that is elastically deformed so that it folds so that both contact portions are brought into elastic contact with the contact portion,
The outer surface of the contact portion is provided with a twist restricting portion that is pressed against the inner periphery of the contact portion so as to restrict twisting in a required direction that acts on the contact portion in accordance with elastic deformation of the connecting portion. We provide press-fit terminals.

  According to the above configuration, the twist restricting portion provided on the outer surface of the abutting portion is brought into pressure contact with the pressure contact portion on the inner surface of the through hole, thereby preventing the twist generated when the press fit terminal is inserted into the through hole.

The torsion restricting portion comprises a groove portion or a ridge portion formed in the length direction on the outer surface of the press contact portion. When the press contact portion is inserted into the through hole, the contact portion is inward. The pressure contact portion may be tilted in a direction opposite to the twist generated in a predetermined direction as it moves to.
In this way, the torsion restricting portion composed of the groove or the ridge acts to generate a rotational force in the required direction like a screw, so that the direction of rotation of the torsion restricting portion is the torsion direction generated in the press-fit terminal. In the opposite direction, the twist of the press-fit terminal can be canceled.

Further, the torsion restricting portion comprises a protrusion formed in the length direction on the outer surface of the press contact portion, and both contact portions move inward when the press contact portion is inserted into the through hole. Accordingly, a claw portion that can bite into the contact portion by a twist generated in a predetermined direction may be provided.
With this configuration, when the occurrence of torsion starts with the insertion of the press-fit terminal into the through hole, the claw portion of the torsion restricting portion acts to bite into the contact portion on the inner periphery of the through hole. It is possible to prevent the terminal from being twisted.

  As is clear from the above description, according to the press-fit terminal of the present invention, when the press-fit terminal is inserted into the through hole, the elasticity generated in the so-called N-type (Z-type) cross-sectionally symmetrical shape. It is possible to prevent twisting in the required direction during deformation. Thereby, the contact pressure to the inner periphery of the through-hole which the contact part originally has can be ensured, and the electrical connection stability of the press-fit terminal can be maintained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of a press-fit terminal 11 of the present invention. This press-fit terminal 11 is press-fitted into a through hole 22 of a printed circuit board 21 (FIG. 2), and is electrically conductive. It is formed into an elongated rectangular bar shape with a rectangular cross section by pressing a metallic wire. A required conductive path (not shown) is formed on the surface of the printed circuit board 21, and a large number of through holes 22 are formed at required positions of the conductive path. Conductive contact portions 23 are formed over the entire circumference by plating or the like. The press-fit terminal 11 is inserted into the through-hole 22 so that electrical contact with the corresponding conductive path can be obtained through the contact portion 23.

  One end of the press-fit terminal 11 is a terminal connection part (not shown) connected to another terminal or the like, and the other end is a board connection part 12 pressed against the contact part 23 of the printed circuit board 21. The board connection portion 12 is formed with a tapered guide portion 13 for guiding insertion into the through hole 22 at the distal end in the insertion direction, and the depth dimension of the through hole 22 is located at a position in front of the guide portion 13. The pressure contact portion 14 with respect to the through hole rule 22 is formed over a longer region.

  Abutting portions 15 a and 15 b that contact the inner periphery of the through hole 22 at opposite positions are formed on both sides of the pressure contact portion 14. Each contact portion 15a, 15b is formed in a thick strip shape and bulges outward substantially in an arc shape, and is bridged in an inclined manner along the diagonal position on the inner surface of each contact portion 15a, 15b. The thin connecting portions 16 are integrally connected. That is, the connecting portion 16 has a plate shape, and as shown in FIG. 1C, between the one end in the width direction of the other contact portion 15a and the other end in the width direction of the other contact portion 15b. It arrange | positions so that it may connect, Thereby, the cross-sectional shape of the press-contact part 14 is made into N shape. Since the pressure contact portion 14 has such a cross-sectional N shape, when the contact portions 15a and 15b on both sides are pressed inward, that is, toward the center portion, the connection portion 16 is centered on the center point P as shown in FIG. (B) While rotating by twisting in the middle A direction, the dimension between the contact portions 15a and 15b can be elastically reduced by bending at the connecting base portion with each pressure contact portion 14.

  In addition, a plurality of groove portions 17 extending in a direction inclined with respect to the axial direction of the press-fit terminal 11 are formed on the outer surfaces of the contact portions 15 a and 15 b in the press-contact portion 14 as twist restricting portions of the press-fit terminal 11. The inclination direction of the groove portion 17 is the twist in the A direction that occurs when both the contact portions 15a and 15b move in the central direction against the elasticity of the connecting portion 16 when the press contact portion 14 is inserted into the through hole 22. Is set in a direction in which the pressure contact portion 14 can be rotated in the opposite direction (B direction). That is, in this embodiment of FIG. 1 (B), it is made to incline in the right direction from the top to the bottom. A rotational force in the direction is applied.

  In addition, a receiving portion 18 is provided on both sides of the press-fit terminal 11 in front of the press-contact portion 14 in the horizontal direction, and the receiving portion 18 is inserted when the press-fit terminal 11 is inserted into the through hole rule 22. It is used as a jig pad.

  Next, as shown in FIGS. 2A and 2B, in order to insert the press-fit terminal 11 into the through hole 22 of the printed circuit board 21 and electrically connect to the contact portion 23, first, the through hole rule. After positioning the press-fit terminal 11 to be inserted into 22, the receiving portion 18 is mechanically pressed. As a result, the press-fit terminal 11 is inserted into the through hole 22 from the guide portion 13 at the tip, and then the press contact portion 14 is press-fitted while being in contact with the contact portion 23. At this time, the contact portions 15 a and 15 b constituting the pressure contact portion 14 are sequentially pressed toward the center by contact with the contact portion 23. As a result, the contact portions 15a and 15b tend to twist in the A direction with the center point P as the base point as the connecting portion 16 is elastically deformed so as to be folded. On the other hand, since the groove portion 17 formed on the outer surface of the contact portions 15a and 15b gets into the contact portion 23 and tries to rotate the pressure contact portion 14 in the B direction, the rotation in the A direction due to the bending of the connecting portion 16 is canceled out. Will be. As a result, the press-fit terminal 11 as a whole can be secured and maintained in an electrically stable state by securing a sufficient contact pressure without causing twisting with respect to the through hole 22.

FIGS. 3A and 3B show a second embodiment of the press-fit terminal 21, in which a groove 27 to be formed on the outer surface of the contact portions 25 a and 25 b in the press contact portion 24 is given a rotational force to the press contact portion 24. Instead, it is designed to function as a slipper. That is, in FIG. 2A, the groove 27 is a straight groove 27 a parallel to the axial direction of the press-fit terminal 21. Further, in FIG. 2B, a cross groove 27b having a mesh shape is formed by combining slopes having different directions.
As described above, in the second embodiment, the groove portion 27 bites into the contact portion 23 to function as an anti-slip, and thereby, the twist in the A direction when the press contact portion 24 is inserted into the through hole 22 can be regulated. .

  In the first and second embodiments, the groove portions 17 and 27 are used as the twist restricting portions. However, instead of the grooves, protrusions protruding outward are arranged in the same manner as the groove portions 17 and 27. It may be.

4A to 4C show a third embodiment of the press-fit terminal 31. The contact portion 23 of the through hole 22 can be inserted into the outer surface of each contact portion 35a, 35b of the press contact portion 34 as a twist restricting portion. The nail | claw part 37 is protrudingly provided. That is, the protrusions 38 are formed so as to protrude in a bulging manner from the base portion on the opposite side of the contact portion 35a, 35b to the central portion from the outer end surface base on the opposite side to the central portion. Yes. And the nail | claw part 37 is formed in an edge part by cutting off the edge part of this protrusion part 38 in a step shape. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.
The claw portion 37 formed in this way acts so that the contact portion 23 is difficult to be twisted against twisting in the A direction when the press-fit terminal 31 is inserted into the through hole 22. For this reason, the twist of the press-fit terminal 31 at the time of insertion into the through hole 22 can be effectively restricted by the claw portion 37.

  In the above embodiment, the press-fit terminal has a N-shaped (Z-shaped) cross section of the pressure contact portion. However, any press-fit terminal can be deformed so that the contact portion is twisted when inserted into the through hole. Well, the premise configuration is not limited. Further, the number of grooves, protrusions, and claw portions as the twist restricting portion may be one or plural, and the number and shape are not limited as long as the twist of the press contact portion can be restricted.

The press fit terminal of 1st Embodiment of this invention is shown, (A) is a front view, (B) is a side view, (C) is XX sectional drawing. (A) is sectional drawing of the state which inserted and fixed the press fit terminal to the through hole, (B) is a principal part enlarged view of a YY cross section. (A) (B) is a side view of the press fit terminal of 2nd Embodiment. A 3rd embodiment of a press fit terminal is shown, (A) is a front view of an important section, (B) is a ZZ sectional view, and (C) is a sectional view in the state inserted in a through hole. (A) (B) is a figure which shows a prior art example.

Explanation of symbols

P Center points 11, 21, 31 Press-fit terminals 14, 24, 34 Press contact portions 15a, 15b Abutting portion 16 Connecting portions 17, 27 Groove portion (twist restricting portion)
37 Claw (torsion control part)
21 Printed circuit board 22 Through hole 23 Contact part

Claims (3)

A press contact portion that can be brought into electrical contact with a contact portion formed on the inner periphery of the through hole by being press-fitted into the through hole of the printed circuit board, and the press contact portion is provided on both sides to contact the contact portion. It consists of a pair of bulging contact parts and a connection part that connects the contact parts with an inclined cross section, and elastically deforms so that the connection part can be folded when the pressure contact part is inserted into the through hole. In the press-fit terminal in which both contact portions are brought into elastic contact with the contact portion,
The outer surface of the contact portion is provided with a twist restricting portion that is pressed against the inner periphery of the contact portion so as to restrict twisting in a required direction that acts on the contact portion in accordance with elastic deformation of the connecting portion. Press-fit terminal.   The torsion restricting portion comprises a groove or a ridge formed in the length direction on the outer surface of the pressure contact portion, and both the contact portions move inward when the pressure contact portion is inserted into the through hole. The press-fit terminal according to claim 1, wherein the press-fit terminal is inclined in a direction in which the press contact portion is rotated in a direction opposite to a twist generated in a predetermined direction.   The torsion restricting portion comprises a protrusion formed in the length direction on the outer surface of the pressure contact portion, and when the pressure contact portion is inserted into the through hole, both contact portions move inwardly. The press-fit terminal according to claim 1, further comprising a claw portion that can bite into the contact portion by a twist generated in a predetermined direction.

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