JPS6033538Y2 - push button switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push button switch, and in particular, it is an object of the present invention to provide a push button switch that is thin and has good sliding action.

Conventionally, this type of push button switch has a prismatic stem inserted into a hole 1a of a box-shaped casing 1 made of an insulating material and containing a stem return spring, a switch mechanism, etc. (not shown), as shown in FIG. 2 is movably attached to the stem 2, and the cylindrical portion 3a of the key top 3 is press-fitted into the upper end of the stem 2, so that the key top 3 is attached to the stem 2. Upon opening, the stem 2 moves upward and downward while performing a sliding motion using the hole 1a of the housing 1 as a guide, thereby switching the contacts.

However, in the above conventional method, the key top 3 and the stem 2
is installed by press-fitting the cylindrical part 3a of the key top 3 into the outer periphery of the tip of the stem 2. Therefore, the stem 2 has a key that protrudes further outward from the part where the stem 2 slides with the hole 1a. A part 2a for attaching the top 3 is required, and as a result, the pushbutton switch becomes larger in the vertical direction, making it impossible to achieve a thin profile. , it becomes necessary to make the stem 2 even longer, and not only can it not be made thinner, but also the stem 2 is generally formed into a relatively thin prismatic shape in order to reduce the size. When the key top 3 is pressed from the direction of the arrow A1 or arrow B in the figure, the sliding movement of the stem 2 is poor and the operating feel is poor.

The present invention is intended to solve the above-mentioned drawbacks of the conventional technology and to securely attach the key top.The present invention will be explained below based on the embodiment shown in FIGS. 2 and 3. Reference numeral 10 denotes a box-shaped casing made of an insulating material containing a stem return spring, a switch mechanism, etc. (not shown), 10a a rectangular hole provided in the casing 10, and 11 a hole 10 in the casing 10.
The stem is movably attached to an insulating material such as polyacetal and has an overall thick hollow prismatic shape, and has an outer circumferential wall 11a and a pair of inner walls 11b formed within the outer circumferential wall 11a. , a cavity 11c formed between the outer peripheral wall 11a and the inner wall 11b, a hollow part lid located at the center of the stem 11 and surrounded by the pair of inner walls 11b and the outer peripheral wall 11a, and a hollow part 11d. The stem 11 has a convex portion 11e provided on the pair of inner walls 11b so as to extend to the side, and the stem 11 has a thick and wide overall shape by forming the pair of inner walls 11b1, a gap 11c, and a hollow portion 11d. It is the property of

Reference numeral 12 denotes a key top made of an insulating material such as ABS resin, and the key top includes a pressing surface 12a, a protrusion 12c provided at the center of the lower surface 12b opposite to the pressing surface 12a, and The protrusion 12c of the key top 12 is formed to have approximately the same size as the hollow portion lid of the stem 11.

To attach the key top 12 to the stem 11, first, the protrusion 12c of the key top 12 is inserted into the hollow part 11d of the stem 11, and the waist protrusion 12c is inserted into the protrusion lie on the inner wall 11b.
bring it into contact with.

Next, when the key top 12 is pushed further, the inner wall 11b
is bent toward the gap 11C by the adjacent gap 11c, the upper end of the stem 11 comes into contact with the lower surface 12b of the key top 12, and the protrusion 11e of the stem 11 sinks into the protrusion 12c of the key top 12 ( creep phenomenon)
This completes the installation of the key top 12.

When attaching the key top 12, even if the fitting between the protrusion 12c and the protrusion 11e is tight and the inner wall 11b is bent, it can escape through the gap 11c.
It is possible to eliminate the influence on the outer peripheral wall 11a that slides with the hole 10a.

Furthermore, as shown in FIG. 4, if a groove 11f is provided between a portion of the outer peripheral wall 11a and the inner wall 11b, the influence of the deflection of the inner wall 11b on the outer peripheral wall 11a can be further reduced.

Next, in the push button switch configured as described above,
Press the pressing surface 12a of the key top 12 against the stem return spring (
(not shown), the stem 11 slides and moves downward using the hole 10a of the housing 10 as a guide.
Turn on the contact.

When the pressure is released, the stem 11 and key top 12 return to their original positions by the stem return spring, and the contact is turned off.
c is within the outer peripheral wall 11a of the stem 11, so the stem 1
Since the stem 11 is thick and wide, the hole 1 of the stem 11 can be used as a sliding surface up to the upper end of the stem 11.
0a is large, and the sliding movement of the stem 11 is good even when pressed from the direction of arrow A or B in FIG. 2.

That is, according to the present invention, the key top 12 and the stem 11 are connected by inserting the protrusion 12c of the key top 12 into the hollow portion 11d provided in the outer peripheral wall 11a of the stem 11. Because of this, the part 2a for attaching the key top 3 that protrudes outward from the stem 2 in the past is no longer necessary, and the stem 1 can be made smaller and thinner in the vertical direction.
1 is such that a gap 11c is provided between the inner wall 11b and the outer peripheral wall 11a so that the deflection of the inner wall 11b when the protrusion 12c of the key top 12 is inserted escapes through the gap 11c. In addition to being able to eliminate the influence on the wall 11a and making the sliding movement of the stem 11 smooth, the above-mentioned structure allows the stem 11 to be made thick and wide as a whole, so that the hole in the casing 10 of the stem 11 can be made thicker and wider. The support for the key top 10a is increased, the sliding movement of the stem 11 is improved, and the projection 12c of the key top 12 is fitted into the projection lie of the stem 11. The scale should be mounted firmly, or the protrusion 11e should be attached to the stem 11.
Since it is provided on the inner wall 11b of the outer circumferential wall 11b, there is an effect that the influence of deflection on the outer peripheral wall 11a can be eliminated.

In the above embodiment, it goes without saying that the protrusion 12c may be provided with a protrusion, or both the protrusion 12c and the inner wall 11b may be provided with a protrusion.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the main part of a conventional push-button switch, Figures 2 to 4 are related to the present invention, Figure 2 is a cross-sectional view of the main part of a push-button switch, and Figure 3 is a cross-sectional view of the main part of a push-button switch with the key top removed. Partially cut away perspective view, FIG. 4 is a partially cutaway perspective view showing another embodiment. 10... Housing, 10a... Hole, 11.
... Stem, lla ... Outer wall, llb
...Inner wall, llc...Gap, lld
...Hollow part, lie...Convex part, 12.
...Key top, 12c...protrusion.

Claims (1)

[Scope of utility model registration request] The stem slidably attached to the hole in the housing includes an inner wall provided within the outer peripheral wall, a gap provided between the inner wall and the outer peripheral wall, and a hollow portion provided between the inner walls. , the key top has a protrusion, the protrusion is provided on at least one of the inner wall of the stem and the protrusion of the key top, and the protrusion of the key top is fitted into the inner wall of the stem. A push button switch.