JPH0715068Y2 - Slide dip switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of a slide dip switch which is directly attached to a printed circuit board for use.

<Prior Art> A slide dip switch that is directly attached to a printed circuit board to set data and the like has been conventionally known. 4 to 7 show an example of a conventional slide dip switch of this type. As shown in FIG. 4, this switch 1 accommodates a plurality of slide switches S in one case 2 made of synthetic resin in this example, and each switch S is formed on both sides of the case 2. The pair of terminal contact pieces 5, 5'are formed and held in two rows in the longitudinal direction and arranged in a so-called dual line. In the slide hole 4a which is transparently provided in the upper lid 4 of the case 2, the operation protrusion 6a of the knob 6 of each switch S is provided.
When the knob 6 is slid in the direction of arrow B in FIG. 4, the corresponding switch S is turned on, and when it is slid to the opposite side, it is turned off.

FIG. 5 is a sectional view showing a section of one slide switch S taken along the line AA ′ in FIG. The case 2 has a rectangular box-shaped case body 3 with an open top surface,
An upper lid 4 that covers the upper opening of the case body 3 is provided. A part of a pair of elongated terminal contact pieces 5, 5'consisting of a conductive thin metal plate forming one switch S is embedded and fixed by insert molding on the side walls 3a, 3a on both sides of the case body 3. There is. One end of each terminal contact piece 5, 5'extends on the inner bottom surface 3b of the case body 3 to form a pair of fixed contact portions 5a, 5'a facing each other in the width direction of the case body.
The other end of each terminal contact piece 5, 5'is led out to the outside from both side surfaces of the case body 3, and is bent downward at a substantially right angle in the vicinity of the side surface of the case body 3 for terminal connection with a printed circuit board 5b, 5 '.
b. The knob 6 is made of a synthetic resin material having a substantially convex cross section, and the central protrusion is used as an operation protrusion 6a, which is protruded into the slide hole 4a of the upper lid 4 of the case 2 and is made into the case body 3
It is housed slidably in the width direction thereof, that is, in the direction in which the pair of fixed contact portions 5a, 5'a are arranged. A movable contact piece 7 is attached to the lower surface side of the knob 6. The movable contact piece 7 is formed in a mountain shape from an elastic metal plate, the mountain height portion of the central portion thereof is attached to the knob 6, and the free end portions on both sides which incline downward toward the end spread as a pair of fixed contact portions 5a, 5'a. And elastically contact with each other. The peripheral edge of the upper lid 4 is fixed to the upper surface of the case body 3 by means of welding or adhesion, whereby the knob 6 and the movable contact 7 are held in the case body 3.

In FIG. 5, when the knob 6 is slid to the left, both ends of the movable contact piece 7 are fixed contact portions 5a, 5a of the pair of terminal contact pieces 5, 5 '.
The switch S is turned on by making contact with 5'a respectively. When the knob 6 is slid to the right, one end of the movable contact piece 7 remains in contact with the fixed contact portion 5'a.
Since the other end is separated from the fixed contact portion 5a, the switch S is turned off. In this way, a pair of terminal contact pieces 5, 5'and a knob 6
And the movable contact piece 7 constitute one slide switch S.

<Problems to be Solved by the Invention> Such a slide DIP switch 1 is generally mounted on a printed circuit board together with other components, and its terminal portion 5b,
5'b is soldered. After the soldering, the soldered portion is washed to remove dirt on the printed circuit board, for example, soldering flux. However, according to the conventional slide dip switch 1, flux or cleaning liquid enters the inside of the switch from the insert-molded portion between the terminal contact pieces 5 and 5'and the case body 3 during soldering or cleaning thereafter. There was a risk of contact failure of the switch. That is, in the conventional slide switch 1, the terminal contact pieces 5 and 5'are insert-molded on the case body 3 so as to closely adhere between them to prevent flux and cleaning liquid from penetrating into the inside of the switch. However, it is actually difficult to completely adhere them by insert molding, and there is a very small gap between them, and flux and cleaning liquid pass through this gap to the inside of the switch. It was invading. This flux and cleaning liquid should not enter the terminal contact piece.
If the insert length of the 5,5 'with respect to the case body 3 is long, it is possible to stop it in the middle of the insert. However, the conventional slide DIP switch 1
As described above, the terminal contact pieces 5, 5'are attached to the side wall 3a of the case body 3,
The insert length a is as short as the wall thickness of the side wall 3a of the case body 3. For this reason, the invasion of flux and cleaning liquid cannot be stopped by the insert-molded parts of the terminal contact pieces 5, 5 ', and they have penetrated into the inside of the switch, causing contact failure.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a slide dip switch in which there is no risk of flux or cleaning liquid entering the inside of the switch from the insert molding portion of the terminal contact piece into the case.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention has a case made of a synthetic resin and a fixed contact portion at one end exposed to the inner bottom surface of the case so as to face each other, and the other end At least one pair of terminal contact pieces formed by inserting the terminal portion to the outside from the side surface of the case and insert-molding an intermediate portion between the fixed contact portion and the terminal portion into the case, and sliding the inside of the case. In a slide dip switch provided with a knob that is capable of being provided, and a movable contact piece that is attached to the lower surface side of the knob and that connects and disconnects the fixed contacts with each other by its sliding operation,
Each of the pair of terminal contact pieces has its terminal portion led to the outside from the side surface of the case on the side where the fixed contact portion of the other terminal contact piece is located, and the middle portion thereof is inserted into the bottom wall of the case. It is designed to be molded.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The same parts as those of FIGS. . FIG. 1 is A- of FIG.
FIG. 7 is a cross-sectional view corresponding to FIG. 5 taken along the line A ′. In the figure, 10 is a slide dip switch of the present invention, 2 is a case, 3 is a case body, 4 is an upper lid, 6 is a knob, 7 is a movable contact piece, and 8 and 8'are terminal contact pieces. The present invention differs from the conventional one in the shape of the terminal contact pieces 8 and 8'and the embedded fixing structure by insert molding of the terminal contact pieces 8 and 8'into the case body 3. That is, the terminal contact pieces 8, 8'include fixed contact portions 8a, 8'a at one end and the terminal portion 8 at the other end.
b, 8'b, fixed contact portions 8a, 8'a and terminal portions 8b, 8'b
Intermediate portions 8c and 8'c between and are embedded in the bottom wall of the case body 3 by insert molding so as to be parallel in the width direction of the case body 3. The fixed contact portions 8a and 8'a at one ends of the terminal contact pieces 8 and 8'are respectively formed on the inner bottom surface 3b of the case body 3.
The upper end is exposed in the width direction of the case main body 3 to face each other, and the terminal portions 8b and 8'b at the other end are fixed contact portions respectively.
It is led out to the outside from the side surface of the case body 3 on the side opposite to the side where 8a and 8'a are located, and is further bent downward to form a connection terminal portion to the printed circuit board. Where the terminal contact piece 8,
The widths of the fixed contact portions 8a, 8'a and the intermediate portions 8c, 8'c of 8'are
When the intermediate portions 8c, 8'c are embedded in parallel with the bottom wall of the case body 3, the distance between the outer side edges of the fixed contact portions 8a, 8'a and the intermediate portions 8c, 8'c is the width of the movable contact 7. It is formed to have a width slightly smaller than 1/2 of the width of the movable contact 7 so as to be substantially the same as.
By constructing the terminal contact pieces 8 and 8'in this way and insert-molding them into the case body 3, the length a of the insert portion of the terminal contact pieces 8 and 8'with respect to the case body 3 is significantly larger than that of the conventional one. become longer. For this reason, even if flux or cleaning liquid enters the minute gap between the terminal contact pieces 8 and 8'and the case body 3 during soldering or cleaning of the slide dip switch 10, the penetration does not occur. It is blocked in the middle of the insert and does not enter the inside of the switch.

In the case body 3 in which the terminal contact pieces 8 and 8 ′ are insert-molded in this manner, the knob 6 and the movable contact 7 are formed in the same manner as the conventional case.
After assembling, the upper lid 4 is fixed to the upper surface of the case body 3, and the slide dip switch 10 is completed. This slide dip switch 10 is a knob 6 in FIG.
When you slide to the left, both ends of the movable contact piece 7
The fixed contacts 8a, 8'a of the pair of terminal contact pieces 8, 8'are brought into contact with each other, and the switch S is turned on. On the other hand, when the knob 6 is slid to the right, both ends of the movable contact piece 7 are separated from the fixed contact portions 8a and 8'a, so that the switch S is turned off.

<Effect of the Invention> The present invention is configured as described above, but the middle portion of the pair of terminal contact pieces that configure the slide dip switch is embedded in the bottom wall of the case in parallel by insert molding. Since the fixed terminal portion at one end is exposed to the inner bottom surface of the case and arranged oppositely, the terminal portion at the other end is led out to the outside from the side surface of the case opposite to the side where the fixed contact portion is located, respectively. The length of the insert portion of the terminal contact piece with respect to the case can be made significantly longer than that of the conventional one. Therefore, when soldering the slide dip switch to a printed circuit board or during subsequent cleaning, even if flux or cleaning liquid enters the minute gap in the insert part between the terminal contact piece and the case, the insert Since the distance between the parts is long, it is possible to sufficiently prevent the intrusion in the middle of the insert part. Therefore, according to the slide dip switch of the present invention, there is no possibility that flux or cleaning liquid enters the inside of the switch to cause contact failure.

[Brief description of drawings]

FIG. 1 is a sectional view of the slide dip switch of the embodiment of the present invention taken along the line AA 'in FIG. 4, and FIGS. 2 and 3 are partial plan views and partial sectional perspective views of the case body,
FIG. 4 is a plan view, a front view and a side view of the slide dip switch, FIG. 5 is a cross-sectional view of the conventional slide switch taken along the line AA ′ in FIG. 4, and FIGS. 6 and 7 are also cases. It is a partial top view and a partial cross-sectional perspective view of a main body. 2 ... Case, 3 ... Case body, 4 ... Top lid, 6 ...
Knob, 7 ... Movable contact, 8,8 '... Terminal contact, 8a, 8'a
...... Fixed contact part, 8b, 8'b ...... Terminal part, 8c, 8'c ...... Intermediate part, 10 ...... Slide dip switch.

Claims (1)

[Scope of utility model registration request] 1. A case made of a synthetic resin and a fixed contact portion at one end are exposed and exposed at an inner bottom surface of the case so as to face each other, and a terminal portion at the other end is led out to the outside from a side surface of the case. At least one pair of terminal contact pieces formed by insert-molding an intermediate portion between the portion and the terminal portion in the case, a knob slidably provided inside the case, and attached to the lower surface side of the knob, By the slide operation, the above 1
In a slide dip switch including a movable contact piece that connects and disconnects a pair of fixed contacts, each of the pair of terminal contact pieces has its terminal portion located on the side where the fixed contact portion of the other terminal contact piece is located. A slide dip switch, characterized in that it is led out to the outside from the side surface of the case, and an intermediate portion thereof is insert-molded on the bottom wall of the case.