JPH04163879A - Contact pin fixing method - Google Patents

Abstract

PURPOSE:To increase the mounting strength, stabilize. and enhance the quality by pressure fitting a contact pin into a hole in a mold, performing a heating process, and thereby welding the inner side face of the hole to the knurled part of the pin. CONSTITUTION:The peripheral surface of a contact pin 3 in its middle part is subjected to a knurling process 12 and formation of grooves 11, and a flange 13 is formed below it. To fix this pin 3 to a mold 2, pressure fitting is made from below an insert hole 10 until the flange 13 runs against the undersurface of the mold 2, and then the pin 3 is heated. When the inner side face of the hole 10 melts and fills the grooves 11, heat is radiated, and thereby the inner side face of the hole 10 is welded strongly to the knurled part 12 of the pin 3. This gives an enhanced mounting strength of the contact pin 3 to lead to enhancement of the quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a contact pin fixing method that improves the attachment strength of the contact pin.

[Prior Art] Conventionally, this type of contact pin has been fixed by knurling the outer circumferential surface of the contact pin to form a groove, press-fitting the contact pin into an insertion hole of a mold, and then inserting a groove into the inner surface of the insertion hole. The knurling process of the contact pin was pressed into place.

[Problem H to be solved by the invention] In the conventional contact pin fixing method described above, when the contact pin is press-fitted into the insertion hole of the mold, the knurled part of the contact pin cuts the inner surface of the insertion hole. Therefore, the fixation of the contact pin sometimes became unstable.

Therefore, a technical problem arises that must be solved in order to stabilize the fixation of the contact pin that is press-fitted into the insertion hole of the mold, and it is an object of the present invention to solve this problem.

[Means for Solving the Problems] The present invention has been proposed to achieve the above object, and includes knurling the outer peripheral surface of the contact pin and press-fitting the cough contact pin into the insertion hole of the mold. It is an object of the present invention to provide a method for fixing a contact pin to be attached, which is characterized in that the contact pin is press-fitted into an insertion hole of a mold and heated.

[Operation] In this invention, a contact pin is press-fitted into an insertion hole of a mold and heated. The inner surface of the insertion hole is melted by the heat of the contact pin, then hardens and welded to the outer peripheral surface of the contact pin.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7 of the attached drawings.

In the figure, reference numeral 1 denotes a connector unit that is attached to a computer or the like, and is formed so that a cable socket (not shown) or the like can be connected from the top surface of the connector unit 1. Contact pins 3, 3, . . . are fixed to the mold 2 of the connector unit 1, and the lower ends of the contact pins 3, 3, . Note that 5 in the figure is an LED mounted on the circuit board 4. Further, 6 is a connector attached to the circuit board 4, and the connector 6 connects the circuit board 4 and other components.

As shown in FIGS. 2 and 3, on both left and right sides of the mold 2, there are elongated fitting holes 7 into which the protruding parts of the socket are fitted.
7 is drilled. A protruding portion 8.8.8.8 is formed along the shape of the fitting hole 7 inside the fitting hole 7.8. The protruding portions 8, 8° 8.8 have connection holes 9, 9...
are formed, and small-diameter insertion holes 10, 10, .
has been opened.

Further, as shown in FIGS. 4 and 5, the contact pin 3 is knurled on the outer peripheral surface of the intermediate portion to form a groove 11.1.
1... are carved, and a flange portion 13 is formed below the knurled portion 12.

When fixing the contact pin 3 to the mold 2, the contact pin 3 is press-fitted into the insertion hole 1° from below the mold 2 until the flange 13 comes into contact with the lower surface of the mold 2. At this time, as shown in FIG. 6, the upper part of the contact pin 3 is exposed in the connection hole 9, and the knurled portion 12 is brought into contact with the inner surface of the insertion hole 10. After that, the contact pin 3 is heated. Therefore, the inner surface of the insertion hole 10 is melted by the heat of the contact pin 3. Then, as the heat is radiated, the inner surface of the insertion hole 10 hardens. Since the inner surface of the insertion hole 10 is melted and hardened, the inner surface of the insertion hole 10 hardens along the groove 11 of the contact pin knurled portion 12, as shown in FIG. Weld to 12.

Note that this invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that this invention extends to such modifications.

C Effects of the Invention: As detailed in the above embodiment, the contact pin is press-fitted into the insertion hole of the mold and heated, so that the inner surface of the insertion hole is welded to the knurled part of the contact pin. .

Therefore, it is an invention that exhibits remarkable effects such as improving the mounting strength of the contact pin and contributing to an improvement in 8.

[Brief explanation of the drawing]

Figure 1 is a front view of the connector unit, Figure 2 is a plan view of the mold, Figure 3 is a cutaway front view of the same part, Figure 4 is a front view of the contact pin, and Figure 5 is a cross section of the main part of the knurled part. 6 is an enlarged sectional view of the main part showing a state in which the contact pin is fixed in the insertion hole, and FIG. 7 is an enlarged sectional view of the main part showing a state in which the inside of the insertion hole is welded to the knurling part. 3 Contact pin 10 Insertion hole 12 Knurled part patent Applicant Mitsumi Electric Co., Ltd. Agent Patent attorney Takashi Hayashi Kiji: +--1', l i Fig. 4 Fig. 6 9/12 Low left processing part

Claims (1)

[Claims] A method for fixing a contact pin in which the outer circumferential surface of the contact pin is knurled and the contact pin is press-fitted into an insertion hole of a mold, the contact pin being press-fitted into the insertion hole of the mold and heated. How to fix contact pins.