JPH0451391Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention relates to push-button switches, etc.
This invention relates to a device having an operating knob that is attached by light press-fitting.

[Prior art] When attaching an operating knob to the end of a shaft or slider member provided in a case, a conventional switch uses a light press-fit via a separate elastic body such as a knob spring or leaf spring. It was common to install it by

[Problem to be solved by the invention] By the way, in the case of the above structure, since a separate elastic body is used, not only does the number of parts increase, but it is also necessary to set the elastic body on the knob or the other side in advance. Because of this, it took a relatively long time to assemble.

Therefore, an object of the present invention is to provide a switch that can eliminate the number of parts and improve ease of assembly.

[Means for Solving the Problems] A switch according to the present invention includes a micro switch fixed in a case, and a switch slidably supported in the case for opening and closing the micro switch, and housed in the case. It includes a valve cover that covers the valve, and a knob attached to the tip of the valve cover, and the following a to d.
It is characterized by having the following.

a. An extending portion is formed at the end of the valve cover on the knob attachment side.

b. The extending portion is formed with a tapered portion and a guide groove that are inclined with respect to the mounting direction of the knob.

c. The knob has a hollow shape that can be fitted around the extension.

d. A guide portion that can be fitted into the guide groove is formed on the inside of the knob and extends in the direction in which the knob is attached.

[Operation of the invention] The switch according to the invention has a tapered part that is inclined with respect to the installation direction of the knob and a guide groove formed in the extending part formed on the valve cover, and a guide groove that is fitted into the guide groove on the inside of the knob. Since a guide part that can be fitted is provided, when the knob is lightly press-fitted in the mounting direction with the guide part inserted into the guide groove, the guide part moves to the back while elastically deforming the tip of the guide groove outward.
Therefore, the elastically deformable portion of the extension is pressed against the inside of the knob, and the knob is attached around the extension.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1 to 4.
This embodiment is an air conditioner switch for an automobile, and a micro switch 2 and valves 3 and 4 are provided in a case 1 that is attached to the body of the automobile. Further, a valve cover 5 that covers the periphery of the valves 3 and 4 is provided inside the case 1. The valve cover 5 is slidable within the case 1, and its inner end 5a is in contact with the pressing portion 2a of the microswitch 2. Further, the inside of the valve cover 5 is divided into two chambers by a partition wall 5b, and the valves 3 and 4 are housed in each chamber.

As shown in FIGS. 2 to 4, the valve cover 5 is integrally formed with an extending portion 6 having a substantially circular cross section. A guide groove 7 is formed in the longitudinal direction on the side of the extension part 6, and as shown in FIG. 3, the upper part of the extension part 6 is formed into a tapered part 6a by the guide groove 7. The guide groove 7 has an inclined surface 7 on the tapered portion 6a side.
a, and when molding, the tip part 7c is smaller than the inner part 7b.
It has a concave shape with little opening on the sides.

Further, an annular projection 8 is provided around the outer surface of the extending portion 6.
are integrally formed. A knob 10 is press-fitted around the extending portion 6.

The knob 10 has a substantially cylindrical cross section with an outer periphery having an inner diameter approximately equal to the maximum outer diameter of the extending portion 6, and a guide portion 11 that enters the guide groove 7 is integrally formed inside the knob 10. The guide portion 11 is a member extending in the mounting direction of the knob 10, while the inclined surface 7a and the tapered portion 6a of the guide groove 7 are arranged obliquely to this mounting direction. Further, as shown in FIG. 3, the guide portion 11 is formed at a position approximately equal to the height of the upper portion of the inner portion 7b, and is configured to slightly interfere with the tip portion 7c.

An annular groove 12 for engaging with the protrusion 8 is formed on the inner wall of the knob 10, and a lens 13 for transmitting light from the bulb 3 or 4 is attached to one end.

Therefore, in FIG. 1, when the knob 10 is pushed to the right in the figure, the valve cover 5 integrated with the knob 10 is pushed in the same direction, and the inner end 5a presses the pressing part 2a, thereby opening the micro switch 2. Open and close the air conditioner and valve 3 to turn on and off. Note that the bulb 4 is for night lighting.

Next, a method of attaching the knob 10 will be explained. first,
In a small assembly state in which the micro switch 2, valve cover 5, etc. are assembled into the case 1 in advance, the extending portion 6 projects outward from the case 1. Therefore, as shown in FIG.
Lightly press in 0. At this time, as shown in FIG.
Since the diameter is slightly smaller than the inner diameter of the knob 10, the tip of the extending portion 6 easily enters into the open end of the knob 10. However, in this state, the guide portion 11 and the tip portion 7c are slightly interfering with each other. Therefore,
When the knob 10 is pushed in the direction of the arrow by shifting it slightly downward so that the tip of the guide part 11 is at the position of the tip part 7c, the guide part 11 is press-fitted into the guide groove 7, and the tapered part 6a is pushed outward in the radial direction. While pushing outward, move towards the inner part 7b. As a result, the tip of the tapered portion 6a is elastically deformed and expanded by the guide portion 11, and the outer diameter increases, causing the knob 1 to expand.
It is pressed against the inner wall surface of 0. Therefore, the two become integrated to the extent that they cannot be easily separated.

Moreover, as shown in FIG. 4, since the protrusion 8 engages into the groove 12, the knob 10 becomes even more difficult to fall off.

[Effects of the invention] The switch according to the invention has a tapered part and a guide groove in the extension part formed at the end of the valve cover, and a knob that is fitted to the outside of this extension part is fitted into the guide groove. Since a matching guide is provided, the knob can be attached to the extension by simply pressing it lightly around the extension to the extent that it will not easily fall off. Therefore, a separate elastic member as in the conventional case can be omitted, so the number of parts can be eliminated, and in addition, ease of assembly can be improved.

[Brief explanation of the drawing]

1 to 4 show an embodiment, FIG. 1 is a vertical cross-sectional view of the switch, FIG. 2 is an explanatory diagram of the main parts,
FIG. 3 is a partial cross-sectional view for explaining how to assemble the main parts, and FIG. 4 is a cross-sectional view of the main parts. Explanation of symbols, 2...Micro switch, 5...
Valve cover, 6... extension part, 7... guide groove,
10...knob, 11...guide section.

Claims (1)

[Scope of Utility Model Registration Claim] A microswitch fixed within a case, a valve cover slidably supported within the case to open and close the microswitch, and covering a valve housed within the case; A switch characterized by comprising a knob attached to the tip of the valve cover, and having the following features a to d. a. An extending portion is formed at the end of the valve cover on the knob attachment side. b. The extending portion is formed with a tapered portion and a guide groove that are inclined with respect to the mounting direction of the knob. c. The knob has a hollow shape that can be fitted around the extension. d. A guide portion that can be fitted into the guide groove is formed on the inside of the knob and extends in the direction in which the knob is attached.