JP2009170331A - Connection terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low contact pressure type connection terminal which can be inserted/pulled into/out of a through-hole of a printed circuit board repeatedly. <P>SOLUTION: The connection terminal includes a square cylinder part 7 formed by applying punching/bending work to one metal plate, and a pair of elastic pieces 9 elongating frontward from the front ends of a pair of opposed side wall portions of the square cylinder part in the state of facing each other. The pair of elastic pieces 9 have parallel parts 13 whose intermediate portions in the elongating direction are pushed against the inner face of the through-hole 23. On the front sides of the parallel parts, front tapered portions 15 are formed where a space between the elastic pieces are gradually narrowed and whose front ends 17 contact each other. Between each of the parallel parts 13 and the square cylinder part 7, arch-curved portions 19 are formed which are approximately arch-curved inside. The parallel parts 13 of the elastic pieces 9 are formed in sectionally circular shape. In the sections of the arch-curved portions 19 near the square cylinder parts 7, reinforced plate portions 25 are formed in sectionally L-shape which are bent to the side of the bottom plate portions of the square cylinder parts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connection terminal that can be repeatedly inserted into and removed from a through hole of a printed circuit board.

  As a connection terminal that is inserted into a through hole of a printed circuit board to obtain an electrical connection with the inner surface of the through hole, a press-fit terminal as described in Patent Document 1, for example, is known. In this press-fit terminal, the tip end side (board insertion side) of the terminal is composed of a tip insertion portion that penetrates the through hole and a contact insertion portion that contacts the inner surface of the through hole, and the tip insertion portion is divided into two parts. The tip portion is formed so as to be inclined inward as it goes to the tip side. Therefore, when the connecting terminal is inserted into the through-hole while the inclined surface of the tip of the connecting terminal is guided to the edge of the through-hole, the tip-inserting portion is easily bent. Can be lowered. Further, when the insertion of the contact insertion portion is completed, the contact insertion portion comes into contact with the inner surface of the through hole with a high contact load, thereby ensuring connection reliability.

JP 2005-174654 A

  A conventional press-fit terminal is manufactured by punching and molding a metal square with a mold or the like, and is very hard. Therefore, the diameter of the circumscribed circle is set larger than the inner diameter of the through hole, and the through hole is formed. This is a method of connecting by shaving, and basically a permanent connection in a press-fit state rather than insertion. In other words, the conventional press-fit terminal is press-fitted into the through hole in the plastic deformation region beyond the elastic deformation region, so if it is pulled out after being inserted into the through hole, it should be reinserted and used repeatedly. It was something that could not be done. Also, the printed circuit board side cannot be reused because the through hole is damaged.

  In view of the above problems, an object of the present invention is to provide a connection terminal that can be repeatedly inserted into and removed from a through hole of a printed circuit board.

In order to achieve this object, the connection terminal according to the present invention is a connection terminal that can be repeatedly inserted into and removed from the through hole of the printed circuit board,
At least a square tube portion formed by processing from a single metal plate and a pair of elastic pieces extending toward the front in a state of facing each other from the front end sides of a pair of opposing side wall portions of the square tube portion Have
The pair of elastic pieces is a parallel part in which the intermediate part in the extending direction is pressed against the inner surface of the through hole, and the tip of the pair of elastic pieces is a tapered part where the distance between the elastic pieces gradually narrows from the parallel part. Are in contact with each other.

  In the connection terminal according to the present invention, it is preferable that a space between the parallel portion and the rectangular tube portion is an arcuate curved portion that is bent inwardly in an arcuate shape.

  In the connection terminal according to the present invention, the portion of the arcuate curved portion near the square tube portion has a reinforcing plate portion bent toward the bottom plate portion of the square tube portion, and has an L-shaped cross section. It is preferable.

  Moreover, the connection terminal which concerns on this invention WHEREIN: It is preferable that the parallel part of a pair of said elastic piece is formed in cross-sectional arc shape.

  The connection terminal according to the present invention has a tapered shape in which the tip is parallel to the middle parallel part of the pair of elastic pieces facing each other, and is in contact with each other at the tip. Therefore, when an external force is applied in the direction in which the parallel portions approach each other, both the tapered portion and the arcuate curved portion are elastically deformed, and the distance between the parallel portions is reduced while being in a parallel state. For this reason, when it is inserted into the through hole of the printed circuit board, the entire length of the parallel part comes into contact with the inner surface of the through hole with a substantially uniform contact pressure, and a good contact state can be obtained even with a low contact pressure. it can. Therefore, since the contact pressure with the inner surface of the through hole can be set low and evenly, the elastic piece does not undergo plastic deformation when inserted into the through hole, and can be repeatedly inserted and removed, and the through hole may be damaged. There are few.

Also, if the portions of the pair of elastic pieces near the square tube portion of the bow-shaped curved portion are bent into an L-shaped cross section, the rigidity of the portions increases, so that the extending direction of the elastic pieces becomes stable and faces each other. It is possible to prevent the pair of elastic pieces from being inclined or displaced in either direction.
Furthermore, if the parallel portion of the elastic piece is formed in a circular arc shape in cross section, the parallel portion is less likely to be elastically deformed, so that the entire length of the parallel portion can be brought into contact with the inner surface of the through hole with a more uniform contact pressure.

  1 and 2 show an embodiment of a connection terminal according to the present invention. This connection terminal 1 is formed by punching and bending from a single metal plate, and as shown in FIG. 1, in order from the rear end side, an insulation barrel portion 3, a wire barrel portion 5, a rectangular tube portion. 7 and a pair of elastic pieces 9 are integrally provided. The insulation barrel part 3 and the wire barrel part 5 are parts for crimping the insulated wires. On the upper surface side of the rectangular tube portion 7, a seam 11 of the edge of the metal plate is formed. The structure of the insulation barrel part 3, the wire barrel part 5, and the square cylinder part 7 is the same as that of the conventional general connection terminal.

  The connection terminal 1 is characterized by a configuration of a pair of elastic pieces 9. That is, as shown in FIG. 2, the pair of elastic pieces 9 are formed so as to extend toward the front in a state of facing each other from the front end sides of the both side wall portions of the rectangular tube portion 7. A parallel portion 13 having a wider interval than the other portions is provided at an intermediate portion in the extending direction of the pair of elastic pieces 9, and a tapered portion 15 in which the interval between the elastic pieces 9 gradually narrows beyond the parallel portion 13. The pair of elastic pieces 9 are in contact with each other at the tip 17. Moreover, between the parallel part 13 and the square cylinder part 7 of the elastic piece 9, it becomes the arch-shaped curved part 19 bent in the shape of a bow inside.

  The parallel portion 13 of the pair of elastic pieces 9 is formed in an arc shape in cross section as shown in FIG. 2C, and is difficult to bend (not easily elastically deformed). On the other hand, at least a part of the tip-side tapered portion 15 and the rear-end-side arcuate curved portion 19 is formed in a flat plate shape, and is easily bent (easily elastically deformed). The curvature radius of the outer surface of the parallel portion 13 is set to be the same as or slightly larger than the curvature radius of the inner surface of the through hole 23 of the printed circuit board 21. Further, the outer surface interval P of the parallel portion 13 is set to be slightly larger than the inner diameter D of the through hole 23. For example, when D = 1.1 mm, P = 1.3 mm is preferable. Thus, when the elastic piece 9 is inserted into the through hole 23 as shown in FIG. 2B, it is pressed against the inner surface of the through hole 23.

  Further, in this embodiment, the elastic piece 9 has a reinforcing plate portion 25 that is bent toward the bottom plate portion side of the rectangular tube portion 7 at the portion near the rectangular tube portion 7 of the arcuate curved portion 19. The portion 25 is formed in an L-shaped cross section that rises from the back side to the front side in FIG.

  Since this connection terminal 1 is configured as described above, when an external force is applied in the direction in which the intermediate parallel portion 13 is brought close to each other, as shown by a two-dot chain line in FIG. Both the recess 15 and the arcuate curved portion 19 on the rear end side are elastically deformed, and the interval between the intermediate parallel portions 13 is narrowed while being in a parallel state. For this reason, when the elastic piece 9 is inserted into the through hole 23 of the printed circuit board 21 as shown in FIG. 2B, the entire length of the intermediate parallel portion 13 contacts the inner surface of the through hole 23 with a substantially uniform contact pressure. Thus, a good contact state can be obtained even at a low contact pressure. Accordingly, since the contact pressure with the inner surface of the through hole can be set low, the elastic piece 9 is not plastically deformed when inserted into the through hole, and can be repeatedly inserted and removed, and the risk of damaging the through hole is small.

  On the other hand, as shown in FIG. 3B, in the connection terminal of the type in which the tip of the elastic piece 9 is open, even when the parallel portion 13 is provided in the middle, when the external force is received, the parallel portion 13 However, when inserted into the through hole, the entire length of the parallel portion 13 cannot contact the inner surface of the through hole with a substantially uniform contact pressure. For this reason, a good contact state cannot be obtained with a low contact pressure.

  In this embodiment, the portion of the elastic piece 9 near the square tube portion 7 of the arcuate curved portion 19 (the portion of the base of the elastic piece 9) is bent into an L-shaped cross section. It becomes high, the extension direction of the elastic piece 9 is stabilized, and it is possible to prevent the pair of elastic pieces 9 facing each other from being inclined or displaced.

  Furthermore, since the parallel part 13 in the middle of the elastic piece 9 is formed in an arc shape in cross section, the parallel part 13 becomes difficult to elastically deform, and the entire length of the parallel part 13 is applied to the inner surface of the through hole 23 with a more uniform contact pressure. Can be contacted.

  FIG. 4 shows an example of a usage state of the connection terminal according to the present invention. This example is a case where a large number of connection terminals 1 configured as described above are incorporated in the connector housing 27 in a fixed arrangement and connected to a large number of through holes of the printed circuit board 21 at a time. Since the connection terminal 1 has a low contact pressure with the inner surface of the through hole, the connection terminal 1 can be inserted and removed even when a large number of connection terminals 1 are connected together.

The perspective view which shows one Embodiment of the connecting terminal which concerns on this invention. (A) is the state before inserting the connection terminal of FIG. 1 into the through hole of the printed circuit board, (B) is a front view showing the state after insertion, and (C) is the CC line of (A). Sectional drawing. (A) is an explanatory view showing the elastic deformation state of the connection terminal according to the present invention, and (B) is an explanatory view showing the elastic deformation state of the connection terminal having an open end. Sectional drawing which shows an example of the use condition of the connecting terminal which concerns on this invention.

Explanation of symbols

1: connection terminal, 3: insulation barrel part, 5: wire barrel part,
7: Square cylinder part, 9: Elastic piece, 13: Parallel part, 15: Tip part, 17: Tip of elastic piece 9, 19: Arched curved part, 21: Printed circuit board, 23: Through hole.

Claims (4)

A connection terminal that can be repeatedly inserted into and removed from the through hole of the printed circuit board,
A pair of rectangular tube portions (7) formed by processing from a single metal plate and a pair extending from the front end sides of a pair of opposing side wall portions of the square tube portion (7) to face each other. And at least an elastic piece (9).
The pair of elastic pieces (9) is a parallel part (13) in which the intermediate part in the extending direction is pressed against the inner surface of the through hole, and the point from which the distance between the elastic pieces gradually narrows from the parallel part. Connection terminal characterized in that it is a part (15) and is in contact with each other at the tip (17).   2. The connection terminal according to claim 1, wherein a space between the parallel part (13) and the rectangular tube part (7) is an arcuate curved part (19) bent inwardly in an arcuate shape.   The portion of the arcuate curved portion (19) near the square tube portion (7) has a reinforcing plate portion (25) bent toward the bottom plate portion of the square tube portion, and has an L-shaped cross section. The connection terminal according to claim 1 or 2.   The connection terminal according to any one of claims 1 to 3, wherein the parallel portion (13) of the pair of elastic pieces (9) is formed in a circular arc shape in cross section.

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