JPH06231647A - Switch device - Google Patents

Abstract

PURPOSE:To provide a switch device of a low cost and a high reliability. CONSTITUTION:A flange 33 having a notch 34 and a projection 35 opposing to the notch 34 are provided to the side surface of an upper case 20, and a check plate 36 having a recess 36a is provided to a lower case 21. By locking the above projection 35 to the recess 36a, the upper case 20 and the lower case 21 are unified, and under such a condition, a holding groove 37 for installing to a substrate 15 is formed with the lower surface of the above flange 33 and the upper surface of the check plate 36. Consequently, the part can be formed without using a slide core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch device mounted on a printed circuit board by utilizing a pair of holding grooves provided in a case body.

[0002]

2. Description of the Related Art A switch device of this type is widely used as a detection switch for detecting a medium of a floppy disk drive (FDD), and an example thereof is shown in FIG. In the figure, reference numeral 1 denotes an upper case having a substantially rectangular shape in plan view, and a space whose lower end is open is defined inside the upper case 1. A pair of cylinders 2 are erected on the upper surface of the upper case 1, and the cylinders 2 are formed with through holes 2a reaching the space. In addition, a pair of flanges 3, 4 extending in the horizontal direction are provided on both side surfaces on the long side of the upper case 1.
And a projection 5 having a taper surface of a lower constriction, respectively, and a holding groove 6 is defined by the lower surface of the upper collar 3 and the upper surface of the lower collar 4. Reference numeral 7 denotes a lower case having a substantially rectangular shape in plan view, and a space having an open upper end is defined inside the lower case 7. Stop plates 8 extending upward are formed on both side surfaces on the long side of the lower case 7, respectively, and the stop plates 8 are formed with recesses 8a whose lower ends are open ends.

The upper case 1 and the lower case 7 are integrated with each other by using the snap action of the stopper plate 8 to lock the projection 5 in the concave portion 8a.
To form. Inside the case body 9, one common contact and two switching contacts (neither is shown) are incorporated, and the external terminals 11, 12, 1 of these respective contacts are incorporated.
Reference numeral 3 projects outward from one side surface of the main body case 9 on the short side. In addition, inside the case body 9, a pair of sliders that can be brought into contact with and separated from the respective contacts, a pair of slider receivers that drive these sliders, and each slider receiver are urged upward. And a pair of return springs (neither of which are shown) are arranged, and the operating elements 13 and 14 which are erected on both slider receivers are provided in the through hole 2a.
And protrudes above the case body 9.

The switch device thus constructed is mounted in the notch 16 formed at one end of the printed circuit board 15 by inserting the printed circuit board 15 into both the holding grooves 6, and the external terminals 11, 12 and 13 are soldered to a land portion (not shown) provided on the back surface of the printed board 15.

[0005]

By the way, in the above-mentioned conventional switch device, the holding groove 6 for attachment to the printed circuit board 15 is defined by the pair of flanges 3 and 4 provided in the upper case 1. , There were the following problems. That is, when the upper case 1 is molded, since the holding groove 6 is orthogonal to the mold opening direction of the mold device, that is, an undercut portion is generated by the holding groove 6, so that the holding groove 6 is formed. It is necessary to use a slide core as the mold structure becomes complicated. In addition, since the slide core is used, not only the shot cycle at the time of molding becomes long, but also the number of cavities is limited, resulting in an increase in cost. In addition, since the slide core portion is long, burrs are likely to occur, which lowers the reliability of the product.

The present invention has been made in view of the circumstances of the prior art as described above, and an object thereof is to provide an inexpensive and highly reliable switch device capable of forming a holding groove without using a slide core. Especially.

[0007]

In order to achieve the above-mentioned object, the present invention has a pair of holding grooves, and a switch device mounted on the printed board by inserting the printed board into these holding grooves. In the first case, a collar having a cutout portion and a protrusion facing the cutout portion are provided in the first case, a stop plate having a recess is provided in the second case, and the protrusion is locked in the recess. The first case and the second case are integrated, and the holding groove is formed by the respective end surfaces of the collar and the stop plate.

[0008]

According to the above means, the first case having the collar and the second case having the stopper plate can be molded without using the slide cores, respectively, and when the two cases are integrated with each other, A retaining groove is formed between the retaining plate and the retaining plate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a perspective view showing a mounting state of a switch device as an embodiment on a printed circuit board, FIG. 2 is an exploded perspective view of the switch device, and FIG. 3 is a sectional view of the switch device.

The switch device shown in these figures has a case body 2 in which an upper case 20 and a lower case 21 are integrated.
2, one common contact 23 and two switching contacts 24 and 25 arranged inside the case main body 22, and a pair of sliders 2 which can be brought into contact with and separated from each of the contacts 23, 24 and 25.
6, 27, a pair of slider receivers 28, 29 for driving these sliders 26, 27, and a pair of return springs 30, 31 for urging the slider receivers 28, 29 upward. It is configured.

The upper case 20 is made of a synthetic resin material,
A pair of tubular portions 32 are erected on the upper surface of the tubular portion 32.
2 is provided with a through hole 32a reaching the inside. Collars 33 are formed on both upper ends of the upper case 20 on the longitudinal side, and the notches 3 are formed substantially in the centers of the collars 33.
4 are formed. Further, projections 35 having a tapered surface with a downward constriction are formed on the lower portions of both side surfaces on the long side of the upper case 20, and these projections 35 are located directly below the cutout portion 34. The lower case 21 is also made of a synthetic resin material, and stopper plates 36 extending upward are formed on both side surfaces of the long side thereof.
A concave portion 36a whose lower end is an open end is formed substantially at the center of 6. The upper case 20 and the lower case 21 are integrated with each other by locking the upper ends of both projections 35 to the upper ends of the recesses 36a by using the snap action of the stopper plate 36 to form the case body 22. To do. Then, in this assembled state, the case body 2
Retaining grooves 37 that extend in the horizontal direction are formed on both side surfaces of No. 2 by the lower surface of the collar 33 and the upper surface of the stopper plate 36, respectively.

Each of the contacts 23, 24, 25 is fitted and fixed in a groove (not shown) formed inside the case body 22, and serves as external terminals 23a, 24a, 25a respectively on the short side of the case body 22. It projects outside from one side. Among these contacts, the common contact 23 is arranged inside the upper case 20 at a position that divides the longitudinal dimension of the case body 22 into two substantially equal parts, and one switching contact 24 is at a position facing one surface of the common contact 24. That is, it is arranged on one wall portion on the short side of the upper case 20, and the other switching contact 25 is located at a position facing the other surface of the common contact 23, that is, the upper case 2.
It is arranged on the other wall portion on the short side of 0. Both of the slider receivers 28 and 29 are housed in the case main body 22 so as to be able to move up and down, and the upper portions of the operators 28a and 29a erected on the slider receivers 28 and 29 have the through holes 32a. To the outside of the upper case 20. Further, the slider 2
Reference numerals 6 and 27 are fixed to the lower surfaces of the slider holders 28 and 29, respectively, and the return springs 30 and 31 are provided between the sliders 26 and 27 and the inner bottom surface of the lower case 21. .

In the switch device thus constructed, by inserting the printed circuit board 15 into both holding grooves 37,
The printed circuit board 15 is mounted in a notch 16 formed at one end thereof, and the external terminals 23a, 24a, 25a are soldered to lands (not shown) on the back surface of the printed circuit board 15. At this time, the printed circuit board 15 is sandwiched between the lower surface of the collar 33 and the upper surface of the stopper plate 36, so that the switch device is securely fixed to the printed circuit board 15 and is highly mounted especially against external force from the vertical direction. Demonstrate strength.

In use, both slider holders 28 and 29 are pushed up by the return springs 30 and 31 when not in operation, and the sliders 26 and 27 are changed over to the switching contacts 24 and 25, respectively.
Since the contact between the switching contact 24 and the common contact 23 is ensured via the one slider 26, the continuity between the switching contact 25 and the common contact 23 is also ensured via the other slider 27. Has been secured. In this state, when the operator 28a is pushed downward against the elastic force of the return spring 30 and the slider receiver 28 is lowered by a predetermined stroke, the slider 26 separates from the switching contact 24 and is changed from on to off. Since the switching is performed, it is possible to determine that the operating element 28a is pushed in by releasing the conduction between the external terminals 23a and 24a. Similarly, when the operator 29a is pushed downward against the elastic force of the return spring 31 to lower the slider receiver 29 by a predetermined stroke, the slider 27 causes the switching contact 2 to move.
Since switching from ON to OFF is performed apart from 5, it is possible to determine that the operating element 29a has been pushed in by releasing conduction between the external terminals 23a and 25a.

In the above-described embodiment, the flange 33 and the protrusion 35 formed on the side surface of the upper case 20 are formed in the notch 34.
Since they are displaced from each other without overlapping with each other, when molding the upper case 20, there is no undercut portion in the mold opening direction, and the upper case 20 is molded without using the slide core. can do. Similarly, since there is no undercut in the lower case 21 in the mold opening direction, the lower case 21 can be molded without using a slide core. Then, in a state where the upper case 20 and the lower case 21 thus formed without using the slide core are integrated, the flange 33 of the upper case 20 and the stopper plate 36 of the lower case 21 are connected to the printed circuit board 15. Since the holding groove 37 for mounting is formed, the shot cycle at the time of molding the component can be shortened, the mold structure can be simplified, the number of cavities can be increased, and the total cost of the switch device can be reduced. You can Further, since the slide core is not required, it is possible to suppress the occurrence of burrs during molding, and it is possible to enhance the reliability of the product.

In the above embodiment, the switch device of the double type in which the two sliders 26, 27 and the like are arranged in the case main body 22 has been described.
It goes without saying that the present invention can be applied to a switch device of a series or more.

[0017]

As described above, according to the present invention,
The flange provided on the first case and the stopper plate provided on the second case form a holding groove for attachment to the printed circuit board, and the first and second cases are molded without using a slide core. Therefore, an inexpensive and highly reliable switch device can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mounting state of a switch device according to an embodiment of the present invention on a printed circuit board.

FIG. 2 is an exploded perspective view of the switch device.

FIG. 3 is a sectional view of the switch device.

FIG. 4 is a perspective view showing a mounting state of a switch device according to a conventional example on a printed circuit board.

[Explanation of symbols]

 15 printed circuit board 16 notch 20 upper case (first case) 21 lower case (second case) 22 case body 23a, 24a, 25a external terminal 33 collar 34 notch portion 35 protrusion 36 stopper plate 36a recess 37 holding groove

Claims (1)

[Claims] 1. A switch device having a pair of holding grooves, wherein the printed circuit board is inserted into the holding grooves to be attached to the printed circuit board, the flange having a notch portion in the first case, and the cutout. A protrusion facing the notch is provided, a stop plate having a recess is provided in the second case, and the protrusion is locked in the recess to integrate the first case and the second case, A switch device, wherein the holding groove is formed by the end faces of the collar and the stop plate.