JPH037852Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a push button switch that is attached to a keyboard and used as a keyboard switch.

(b) Prior Art When a large number of the above-mentioned push button switches are mounted on a board, such as in a full keyboard, the switches are mounted by automatic soldering. In this soldering process, the terminal portion of the board is immersed in solder flux.

(c) Problems to be solved by the invention When automatic soldering is used as described above, the structure of the push button switch is such that the terminal of the switch unit extends downward from the through hole formed at the bottom of the switch case. If the terminals of the switch are immersed in solder flux as described above, the solder flux will infiltrate into the interior through the gap between the through hole of the switch case and the terminal due to capillary action.

On the other hand, there is a plunger that moves up and down inside the switch case, and if the solder flux adheres to this plunger, the vertical sliding of the plunger is deteriorated, resulting in a problem that the operability of the plunger is deteriorated.

The object of this invention is to provide a push button switch that prevents solder flux from entering the sliding portion of the plunger and allows smooth sliding of the plunger.

(d) Means for Solving the Problems This invention is characterized in that it is a push button switch in which a partition wall is formed at the bottom of the switch case between the plunger and the switch unit.

(E) Function The push button switch of this invention has a partition wall that prevents solder flux from penetrating into the plunger portion, even though solder flux enters the inside of the switch case due to capillary action from between the terminal of the switch unit and the switch case. Cut off.

(f) Effect of the invention According to this invention, although solder flux infiltrates into the switch case from between the terminal of the switch unit and the switch case due to capillary action, it is prevented from infiltrating into the plunger part by the partition wall. This reliably prevents solder flux from deteriorating the vertical sliding of the plunger, and maintains smooth sliding.

(g) Example of the invention An example of the invention will be described below in detail based on the drawings.

The drawings show a push button switch, and in FIGS. 1 to 4, the push button switch 11 is composed of a key top 12, a switch cover 13, a plunger 14, a spring 15, a switch case 16, an operating piece 17, and a switch unit 18. It is structured as follows.

The aforementioned switch case 16 has a concave storage section 19.
A receiving portion 20 for the spring 15 is provided protruding from the center bottom of the inside. Furthermore, guide rails 21 are integrally formed on opposing sides of the interior to guide the vertical movement of the plunger 14 by contacting its four corners, and the upper ends of these guide rails are connected to the openings 24 of the switch cover 13, which will be described later. It extends to the top surface. Also, on the side of the plunger 14, there is a protrusion 22 for regulating the upward movement of the plunger 14.
is formed.

The aforementioned plunger 14 has a receiving recess 23 for the spring 15 formed on its bottom surface, and the spring 15 is interposed between this receiving recess 23 and the aforementioned receiving portion 20.

The above-mentioned switch cover 13 has an opening 24 formed in the upper center thereof, and at the four corners of this opening 24, stealth holes 24a are formed for extending the upper ends of the above-mentioned guide rails 21 to the upper surface. ing.

Also, locking pieces 25, 25 extending downward are formed in series on opposite side edges, and these locking pieces 2
5 and 25 are formed with locking holes 26 and 26, and when the locking holes 26 and 26 are forcefully fitted into the locking protrusions 27 and 27 formed on the outer surface of the switch case 16, they are mutually connected. When locked, the switch cover 13 is fixed to the switch unit 18.

The rim of the opening 24 of the switch cover 13 is provided with the protrusions 22, 22 of the plunger 14.
A regulating edge 28, 2 facing and abutting against the head of the
8, and these regulating edges 28, 28 prevent the plunger 14 from coming off.

The upper half of the plunger 14 is provided to protrude from the opening 24 of the switch cover 13, and a mounting hole 29 for the key top 12 is formed in the upper surface of the plunger 14. The section 30 is fitted. And key top 1
2, the plunger 14 is moved up and down.

Inside the switch case 16 on one side of the aforementioned plunger 14, a partition wall 31 whose upper end extends to approximately the middle position of the switch case 16 is connected to the bottom thereof, and between this partition wall 31 and the side wall, the above-mentioned switch unit is connected. 18 are arranged.

The aforementioned operation piece 17 is made of an elastic plate spring material, and has a locking part 32 on its upper part that is locked to the upper part of the switch unit 18, and also extends in an inclined shape toward the plunger 14 side. A bifurcated movable piece 3 that is in contact with the opposite lower edge of the plunger 14
3, and a protrusion 34 is formed on the back side thereof. This operation piece 17 is the plunger 14.
When the plunger 14 moves downward, the movable piece 33 is pressed down, and the protrusion 34 is moved outward. In other words, the vertical movement of the plunger 14 is converted into a lateral movement, and this lateral movement causes the protrusion 34 to move outward. 34 operates an operating section 38 of the switch unit 18, which will be described later.

As shown in FIG. 4, the switch unit 18 described above has a unit case 35 and a unit cover 36.
As a result, a unit body 37 having an enclosed structure is formed, and this unit body 37 is made of a resin material.
The operation section 38 is formed by cutting out both sides and the upper three sides of the operation section 38 so as to be connected to each other so as to be restored by utilizing the elasticity of the material.

The above-mentioned unit case 35 has three terminals 3.
9, 40, and 40 are formed as inserts, and the central terminal 39 has a connecting portion 41 exposed at the center inside the unit case 35, and the lower end of the movable contact 42 is caulked to this connecting portion 41. Fixed. Further, the left and right terminals 40, 40 are connected at the upper part inside the unit case 35, and
A fixed contact 43 is exposed at a position facing the upper end side contact portion of the movable contact 42 described above, and the movable contact 42 and the fixed contact 43 are usually separated,
When the aforementioned operating section 38 is pressed down inside the unit, the movable contact 42 is moved to the fixed contact 43.
can be contacted.

The unit case 35 and unit cover 36 are fitted and fixed as appropriate.

Further, when the switch unit 18 is housed in the partition wall 31 of the switch case 16, the three terminals 39, 40, 40 extending downward protrude downward through the through hole 44 formed at the bottom of the switch case 16. , and the operation section 3 of the switch unit 18
8 is stored facing the plunger 14 side.

Push button switch 11 configured in this way
Since the plunger 14 is urged upward by the spring 15, the key top 12 is normally positioned upward as shown in FIG.

Then, when the key top 12 is pressed down, the plunger 14 is guided by the guide rails 21 and lowered, and the lower edge of the plunger 14 facing the operation piece 17 presses down the movable piece 33 of the operation piece 17, which moves it to the switch unit. With this movement, the protrusion 34 of the movable piece 33 is moved to the switch unit 1 side.
8, and this operation pushes down the internal movable contact 42, and this movable contact 42 contacts the fixed contact 43 to operate the switch.

In the push button switch 11 described above, when the terminals of the switch unit 18 are immersed in solder flux for automatic soldering, the through holes 44 of the switch case 16 and the terminals 39, 40, 40
Even if the water between the
Infiltration into the 4th side is prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is an exploded perspective view of a push button switch, Fig. 2 is a vertical sectional view thereof, Fig. 3 is an exploded perspective view of the switch unit, and Fig. 4 shows the operating state. FIG. DESCRIPTION OF SYMBOLS 11...Push button switch, 13...Switch cover, 15...Spring, 16...Switch case, 17...Operation piece, 18...Switch unit, 19...Storage part, 22...Protrusion, 24...
...Opening portion, 28...Regulation edge, 31...Partition wall, 3
9, 40...Terminal, 44...Through hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A switch case having a concave storage portion; a plunger that is housed in the storage portion of the switch case and can be slid up and down, and has a protrusion formed on the side surface for regulating the upward movement position; a spring that urges the plunger upward; an opening that covers the upper surface of the switch case and that allows the upper part of the plunger to protrude; a switch cover that engages to restrict the upward movement position of the plunger; an operating piece that is housed on one side of the plunger in the switch case and converts vertical movement of the plunger into lateral movement; The switch is housed on one side of the operating piece and has a terminal extending downward through the switch case through hole, and is operated by lateral movement of the operating piece based on the vertical movement of the plunger. A push-button switch, comprising: a push-button switch; and a partition wall formed at the bottom of a switch case between the plunger and the switch unit.