JPS61101974A - Contact pin for connector - 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 The present invention relates to improvements in contact pins in connectors.

Contact pin a in connector A is...

As shown in Fig. 3, when the connector A is assembled to the body 10, the core wire b of the cord B is connected to the soldered part of the rear end of the connector A by soldering. Since the rear end is thin, it is difficult to apply solder, and this soldering process is troublesome.

In order to solve this problem, as shown in Figure 1,
There is a method of cutting the rear end of the contact pin a into a semi-cylindrical shape to form a solder application surface W, but this means that the solder application surface W is flat and the core wire of code B is cut. Since it is difficult to stabilize the core wire when the connector is placed on the connector, it is difficult to perform secure soldering.
After assembly, the plating process is changed because cutting to form the solder application surface W is not performed and it is difficult to align the solder application surface W in one direction. After finishing, the finished contact pin a is subjected to a process of cutting the solder application surface W, so that the solder application surface W to be formed becomes an unplated surface, and the welded solder becomes so-called immo solder. There is a problem that it becomes easy to peel off. In addition, in order to stably hold the core wire of code B to be soldered in a state of contact,
A hole 20 along the axial direction is bored in the rear end surface of the contact pin a as shown in FIG.
There is also known a method in which a core wire is inserted and solder is applied in this state. This means that the core wire of code B to be soldered will be in a temporary state, and since there is no directionality on the plated surface of the /\ solder, connector A should be plated and finished. body 10
However, when finishing the contact pin a by plating, it is difficult for the plating to adhere to the inner surface of the hole 20, so the hole 2 is used as the solder mounting surface.
In order to solve these problems, the present invention has the following problems: 1) When the inner surface of 0 is not sufficiently plated, and when soldering is carried out, it becomes the aforementioned immoldering state and completely peels off. The solder mounting surface is in a form in which the core wire of cord B that is in contact is stably held, and the solder mounting surface is sufficiently plated to prevent the solder from melting. The purpose is to ensure that welding is performed reliably.

In order to achieve this object, in the present invention, the main body of the contact pin made of a metal bar is provided with a hole at the rear end thereof that extends inward from the rear end surface along the axial direction. At the same time, the outer peripheral surface is plated, and one half of the rear end of the main body of the contact pin, which will become the peripheral wall of the hole, is pushed toward the inner wall of the other half of the hole, and the other half is pushed along the inner wall. The present invention proposes a means for forming a solder application surface by overlapping them.

Next, embodiments will be described in detail with reference to the drawings.

In Fig. 3, 10 is the body of an 8-pin type connector A, a... is the contact pin aligned and assembled to the body 10, B is the contact pin a... and the core wire b.
... is connected to the cord, and C indicates a cover made of synthetic resin and molded into a case shape that can be opened and closed.

The body 10 is made of synthetic resin and is formed separately from the cover C into a prismatic shape as shown in FIG. It is assembled into the inner cavity of cover 〇. The body 10 includes:
When molding it, fitting holes 10b that pass through the front and back (left and right in FIGS. 3 and 4) are aligned and formed at the positions where the contact pins a are assembled. , each contact pin a is assembled by press-fitting into this fitting hole 10b.
... may be integrally insert-molded and held in place during assembly.

The contact pin a is formed by cutting a metal bar 30 as shown in FIG. 5 into predetermined dimensions as shown in FIG. A flange 31 is formed at the part near the right end in Fig. 6), and a hole 32 is formed at the rear end to extend inward along the axial direction from the rear end surface (Fig. 7). (In some cases, the flange 31 and the hole 32 are formed by cutting the material 30), and the knurling part 3 is formed by knurling a portion slightly closer to the front end than the flange 31.
3 (Fig. 8), and further performs plating to plate the outer peripheral surface, thereby forming the contact pin main body 3 whose outer peripheral surface is plated as shown in Fig. 8. Form. And this contact pin main body part 3
As shown in Fig. 11, apply a chisel-shaped punch P whose tip is arcuate in side view as shown in Fig. 1O to the upper surface side of the portion that will become the circumferential wall of the hole 32 at the rear end, and is supported by the die d as shown in FIG. 12, and is pressed by the punch P, thereby converting the half-circumferential portion 32a of the portion that will become the peripheral wall of the hole 3z into the other half-circumferential portion, as shown in FIG. 13. 32b toward the inner wall surface and overlap the inner wall surface to form a semi-cylindrical shape, the inner surface of this semi-cylindrical portion forms the solder mounting surface W, and thereby the solder is applied to the rear end portion. The contact pin a is configured with a serving surface W of .

The work of forming a semi-cylindrical solder mounting surface W on the rear end of the contact pin main body 3 using the punch P is performed with the contact pin main body 3 assembled to the body 10 of the connector A. good. In this case, as shown in FIG. 12, the punches P and the dies d are positioned so as to correspond to the contact pin main body parts 3 that are assembled and aligned in the body 1O, and are integrated in a state in which they are arranged in parallel in multiple series. The main body portions 3 of the contact pins 3 are assembled into the upper and lower mold mounts of a press machine, respectively, and the contact pin main body portions 3 are assembled into the die set.

By supplying the contact pins assembled to O and operating the press device, the contact pin main body parts 3, which are aligned and assembled on the body 10, can be pressed in the upper and lower rows at once. Next, the operation of the contact pin a according to the present invention constructed as described above will be explained.

The contact pin a according to the present invention has a solder application surface W formed on the rear end thereof, as shown in FIG.
When the core wire of cord B to be connected is placed on it, it is shaped to stably hold it so that it does not escape to the side, so that solder placement work can be easily performed.

Since the solder application surface W is formed by pressing the plated contact pin main body 3 while leaving the outer circumferential surface intact, the solder application surface W is formed by pressing the contact pin main body 3, leaving the plated outer peripheral surface as it is. This will be done on the plated area to ensure /\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\....”.

Further, this solder application surface W is a half circumference of the part that becomes the peripheral wall of the hole 32 at the rear end of the contact pin main body 3, which has a hole 32 at the rear end and is plated on the outer peripheral surface. Since the part is formed by pressing with a punch P,
Since the contact pin main body 3 can be formed even after the contact pin main body 3 is assembled to the body 10, it is possible to form the contact pins so that they are aligned in one direction for a large number of contact pins a... that are aligned and assembled to the body lO. It becomes easier.

As explained above, the contact pin a in the connector according to the present invention has a shape that can stably hold the core wire of the cord B in contact with the solder application surface W, and When the plating is sufficiently applied, soldering becomes easier and the soldering becomes more reliable.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the rear half of a contact pin in a conventional connector, FIG. 2 is a perspective view of the rear half of a contact pin in another conventional connector, and FIG. 3 shows a case of a connector in which the present invention can be implemented. FIG. 4 is a side view of the body in an open state, FIG. 5 is a side view of the material of the contact pin according to the present invention, and FIG. 7 is a partially broken side view of the same as the above, FIG. 8 is a partially broken side view of the same as the above after knurling, FIG. 9 is a perspective view of the rear end of the same as the above, and FIG. Fig. 10 is a perspective view of the punch, Fig. 11 is an explanatory view of the pressing process by the same punch, Fig. 12 is an explanatory view of the swivel set to be assembled to the pull device, and Fig. 13 is a perspective view of the rear part of the contact pin according to the present invention. It is. Explanation of drawing symbols A...Connector B...Code a...Contact pin b...Core wire C...Cover d.
...Die P...Punch W...Plate surface lo・
...Body loa...Engaging part 10b...Fitting hole 2o...Hole 3...Contact pin main body part
3o...Bar material 31...Flange 32aΦ32
b...;Half circumference part 33...Knurling part Patent applicant Moji Seisakusho Co., Ltd. Agent Patent attorney Kazu Shinseki Department Figure 1 Figure 2 Figure 4 Prisoner No. 3vlJ

Claims (1)

[Claims] A contact pin main body 3 made of a metal rod has a hole 3 at its rear end that extends inward from the rear end surface along the axial direction.
2 is bored, and the outer circumferential surface is plated, and the half circumferential portion 32a of the rear end of the contact pin main body 3, which becomes the circumferential wall of the hole portion 32, is inserted into the inner half circumferential portion 32b of the other half. A contact pin in a connector, characterized in that it is pushed toward a wall surface and overlapped with the inner wall surface, and the pushed half circumferential portion 32a forms a solder application surface w.