JPS5925117A - Method of producing pushbutton switch - 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] <Field of the Invention> The present invention relates to a method for manufacturing a pushbutton switch in which a pushbutton to be suppressed is held between a base and a cover attached to the base. .

BACKGROUND OF THE INVENTION An example of this type of pushbutton switch is shown in FIGS. 6 and 7.

The illustrated pushbutton switch 1o has a base 1 which integrally has a terminal 12 electrically connected to a fixed contact 11.
3, a push button 14 to be pressed, a circular dome-shaped reversing spring 15 disposed between the push button 14 and the base 13 and acting as a movable contact; It also includes a cover 16 for holding.

Generally, a notch 15avc formed in the base 13 is fitted into a part of the outer periphery of the cover 16 (in the illustrated example, the center of one side of the rectangular cover 16).

A tongue piece 16a is formed to determine the direction when assembling into the base 13, and a tongue piece 16a is formed to determine the direction when assembled into the base 13.
Positioning protrusions 14b that fit into the fitting holes 13b formed on the base 15 are formed at two locations on the outer periphery of the cup 15. The direction of time is determined. Therefore, it is necessary to carry out the step of assembling the push button 14 and the cover 16 into the base 13 while maintaining their orientation with respect to the base 15 at a predetermined value. On the other hand, since the dome-shaped reversing spring 15 applies a return force to the push button 14 after being pressed, it is assembled into the base 13 with the surface facing the push button 14 protruding. , push button 1
4 is provided with a conical pivot portion 140 that comes into contact with the top of the reversing spring 15, making it difficult to assemble the push button 14 independently onto the reversing spring 15 when it is assembled into the base 13. It is. Therefore, the push button 14 first presses its push operation portion 14d with force/(16 fitting holes 1
s16b and assemble them, and after setting the directionality of the strainer to a predetermined value, it is assembled into the base 13 together with Σσ) force/(-10. The pushbutton switch 10 assembled in this way is shown in Figure 7,
According to this pushbutton switch 10, when the push operation portion 14d of the pushbutton 14 is pushed in against the bias of the reversing spring 15 (see FIG. 6).

Accordingly, when the bar 15 is reversed, the contact is closed, and when the pushing force is released, the push button 14 is returned to its original position together with the reversal bar 15 by the elastic return force of the reversal spring 15. The contacts are opened.

In addition to the above pushbutton switch 10, conventionally, the pushbutton 14 and cover 16 are generally manufactured separately and sent to the assembly process. A parts feeder was commonly used to align the button 14 and cover 16. However, when using a parts feeder, the performance of the parts feeder itself is low, so parts often get clogged, which leads to an additional problem of lowering the operating rate of the entire assembly line. In addition, since the push buttons 14 are generally made of synthetic resin and are layered, the push buttons may come into contact with each other in the parts feeder and be charged with static electricity.
Foreign matter such as dust during static electricity, or foreign objects such as molded parts that fall off from the push buttons 14 due to contact between the push buttons 14 may adhere to the push buttons 14. Since these foreign substances are generally electrical insulators, the push button switch 10
As a result of repeated operations, the oil may adhere between the electrical contacts, and this may cause a fatal defect such as poor oil conduction.

<Object of the Invention> The present invention is directed to integrating a push button into each cover in a continuous cover body made up of a plurality of consecutive covers during resin molding, and removing the cover when or after the cover is assembled into the base. The cover is broken and separated from the continuous body, and the push button is separated from the cover, without using a parts feeder to align the push button and the cover.

Moreover, it is an object of the present invention to provide a method of manufacturing a pushbutton switch that can prevent dust from adhering to the pushbutton before it is assembled into the base, which would cause a deterioration in contact performance.

<Description of Embodiments> The continuous cover body 17 shown in FIG. A cover 16 is formed thereon. In such a continuous cover body 17, one end edge 17a and the other end edge 17bK in the width direction, one side of the cover 16, and the other side opposite to the cover 16 form a connecting portion 170° 17d that connects them. Each is supported through Further, the center part of the cover 16 has a fitting hole 1 into which the pressing operation part 14d of the push button 14 is fitted.
6b, and its four corners have a base 13 (ltll
The fixing protrusion 15C (see Fig. 6) is inserted into the hole 1.
Further, small holes 16d are punched out at two symmetrical locations across the fitting hole portion 16b at the same time as the punched portion 18 is formed.

Next, as shown in FIG.
It is held on the back side of 6. That is, the push button 14 is molded by placing an upper mold and a lower mold for resin molding on the upper and lower sides of the cover 16, respectively, and injecting resin into the inside of the mold. At the same time, the resin also flows into the small hole 16d of the cover 16 to form a rivet portion 19, and the push button 14 is held on the cover 16 by this rivet portion 19.

In this case, a polygonal concave portion 20& is formed on the top surface of the pressing operation @14d that molds the fitting hole portion 16b of the cover 16 into a shape overnight, and a flange portion formed on the back side of the cover 16. At the center of the lower surface of 14a is the above-mentioned reversing spring 15 (sixth
(see figure) A conical pivot part 14c that comes into contact with the top of the
are molded at the same time.

As described above, the continuous cover body 17 includes a plurality of covers 16 each holding a resin-molded push button 14,
Thereafter, it is transported as it is to the vicinity of a base placement part (not shown) in a pushbutton switch assembly line. Then, in the vicinity of the base 15, the cover 1
6 from the cover continuum 17;
By rotating the push button 14 relative to the
A step of separating the push button 14 from the base 13, and a step of accommodating the push button 14 in the base 13 and attaching the cover 16 to the base 13 are performed. Here, when separating the cover 16 from the cover-continuous body 17, the above-mentioned continuous portions 17 (1, 17d) are cut.
9, a polygonal shaft is inserted into the recessed portion 2Q& of the push button 14, and this shaft is rotated.

By rotating the cover 16 about this axis (when the cover 16 is separated from the cover continuous body 17), shearing force is applied to the bed portion 19 of the 11 mentioned above. As a result, the 11 bet part 19 is sheared at the same level A as the back surface of the cup (-16), so the push button 14 is separated from the cover 16.

Furthermore, when attaching the cover 16 to the base 13, fit the four holes 160 of the cover 16 into the four protrusions 13 o (g < see figure b) of the base 15 separately, and in this state, insert the protrusions 130 The cover 16 is fixed to the base 15 by melt-molding the top part of the cover 16 into a brim shape.
6 to the base 13, at the same time pushbutton 1
4 is accommodated in the base 15 yen.

The three steps described above can be performed in any order. For example, in the vicinity of the base 13, first, cover 1
6 from within the hippo continuum.

After obtaining a combination of the cover 16 and the push button 14 as shown in FIG. 3 and attaching the cover 16 to the base 13, the rivet portion 19 is sheared to separate the push button 14 from the cover 16. In addition, the separation of the push button 14 from the cover 16 by shearing the lipo-separating portion 19 can be prevented from happening on the cover 1.
In this embodiment, in order to apply the rotational force for shearing the rivet portion 19 to the push button 14, the operation may be performed immediately before attaching the rivet portion 19 to the base 13. Although a case has been described in which a polygonal recess 201L into which an operating shaft is inserted is formed and this recess 20a is utilized, there are various modifications. For example, as shown in FIG.
b, and it is also possible to fit a wrench of similar shape thereto and rotate it.As shown in FIG. It is also possible to form a notch 20 (l) and engage a bottle for one rotation to rotate it. This is an example in which the shape of the top of the pressing operation portion 14d is non-circular.

<Structure and Effects of the Invention> According to the present invention, the push button is directly molded with resin and integrated into each cover of the series of covers in advance. In addition, the series of covers is useful as a means of transporting the pushbuttons, and it also prevents the pushbuttons from touching each other and being charged with static electricity during transport, improving contact performance. The adhesion of insulating dust and molded particles to the push button, which causes deterioration, is minimized. As a result, there is no need to use a parts feeder, which prevents a decrease in the operating rate of the entire assembly line due to the parts feeder being overfilled, and makes it possible to provide high-quality pushbutton switches. become able to. Furthermore, since no parts feeder is required, equipment costs and running costs are low, and this, combined with the simplification of the assembly process, makes it possible to provide a low-cost pushbutton switch.

[Brief explanation of drawings]

@Figure 1 is a partial perspective view of a series of covers, Figure 2 is an enlarged sectional view of the cover when the push button is molded with resin, and Figure 3 is the cover holding the push button separated from the series of covers. Figure 4) is an enlarged partial perspective view showing a modified example of the shape of the top of the pressing operation part of the push button; Figure 5 is an enlarged partial perspective view showing a modified example of the included package; Figure 6; 7(2) is an exploded view of the pushbutton switch, and No. 7 (2) is a completed view of the same assembly. 10...Push button switch, 13...Base, 14
...Push button, 16...Cover, 17...Cover continuous body, 19...Rivet portion. Figure 6 Figure 7

Claims (1)

[Claims] (1) A method for manufacturing a pushbutton switch in which a pushbutton to be pressed is held between a base and a cover attached to the base, in which a plurality of covers having small holes are integrally continuous. After the step of molding the push button with resin, the push button is held on the back side by the resin injected into the small holes of the cover in the cover continuum, and then the cover is removed from the cover continuum. and the process of separating. By rotating the push button relative to the cover,
separating the push button from the cover by shearing the continuous portion between the push button and the resin injected into the small hole; housing the push button in the base and attaching the cover to the base; A method for manufacturing a pushbutton switch, characterized in that the steps are performed in any order.