JPS62259310A - Push-button switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to the structure of a pushbutton switch.

(Problems with the prior art) The switches used in keyboards, etc., have a function that when you press button 1 for ``Nosukiai'', ``Geki 4th man'', ``Hani 7M'', and ``Departure'', a predetermined stroke sinks. , press the electrode to close an open circuit, or conversely open a closed circuit.

As illustrated in FIG. 8, such a switch has a main body 3.
The shaft 1 for pressing the electrode 4 is inserted into the guide part 21 provided in the
8 is slid to bring the electrodes into contact or to disconnect them. Normally, both the main body and the shaft are made of plastic, and various combinations of plastics are being considered.In such a switch, as shown in Figure 9, when the switch is pressed diagonally (arrow A), Stress is concentrated at the shaft end or guide end (arrow B), making it difficult to slide, and especially the edge of the end may scratch the other party and cause abnormal wear. This causes problems such as malfunction of the key and shortened life due to wear.

However, in reality, there is a strong tendency for pushbutton switches to be pressed diagonally, and there is a strong demand for pushbutton switches that operate without problems even when pressed diagonally.

(Means for Solving Problems) The switch of the present invention has durability against pressure from a diagonal direction.

That is, the present invention has a polygonal prism-shaped movable part that is open downward, and a guide part that has an electrode pressing shaft formed in the center of the main body and has a space inside. However, the guide part is located inside the movable part and outside the electrode pressing shaft, and the gap between the inside of the movable part and the outside of the -t guide part is a sliding part provided at a substantially symmetrical position between the two parts. Part (1
To provide a push button switch, which is characterized in that the minimum gap is the smallest in terms of distance, and the minimum gap is smaller than the minimum gap between the outside of the electrode pressing shaft and the inside of the guide part.

Unexploded F below! A? : An example will be explained with reference to explanatory diagram 1.2. Reference numeral 11 denotes a guide section provided in the switch body 3. The guide portion 11 has a chamber through which a shaft 8 for pressing the electrode 4, which will be described later, passes through.

The movable part 12 has a quadrangular prism shape that is open downward (toward the electrodes), and a shaft 8 for pressing the electrodes is connected to the center of the movable part 12 . In the example shown in FIGS. 1 and 2, the movable portion 12 is in phase with the square key top l.

Further, a part of the inner corner part 25 of the quadrangular prism-shaped movable part and a part of the protruding part 13 of the guide part 11 provided on the main body are adapted to slide. In other words, the sliding portion 14 in the present invention refers to a portion including the portion where sliding occurs and where the gap between the movable portion and the guide portion is the smallest compared to the gap in other portions. In addition, the top 1 and the movable part 12t
- In the example shown in this figure, they are separate parts, but they may be integrated.

The electrode pressing shaft 8 has a predetermined length, and
K is designed to move the electrode 4 attached to the tip. By changing the relative position of the main body 3 and the movable part 12, the circuit 6 can be opened and closed by the action of the electrode 4.

The shaft 8 passes inside the guide portion 11 of the main body. Whereas in the conventional switch, the sliding portion 14 slides between the guide portion 11 and the shaft 8, in the switch of the present invention, the sliding portion 14 slides between the inside of the four corner portions 25 of the movable portion 12 and the guide portion 1.
1 and the outside of a protruding portion 13, and is structured to be slid by a part of this portion. That is, as shown in FIG. 2, the shape of the guide portion 11 in the portion corresponding to the corner portion 25 of the movable portion 12 is made into a protruding shape 13 extending outward. Of course, the gap between the shaft 8 and the inside of the guide portion 11 should be wider 9, so that there is no sliding in this area. Furthermore, from the relationship of key touch, the part corresponding to the inner side of the movable part 12, that is, the part other than the sliding part 14,
It is also preferable that there is no sliding movement between the guide portion 11 and the guide portion 11 .

As a result, in the switch of the present invention, as shown in the example of FIG. The first feature is that the sliding portion 14 is formed at this point. The part of the corner and its vicinity, that is, the sliding iK shadow formation of the present invention.1.If the minimum gap t- between the right kite part and the movable part is tl, then the distance between the inside of the guide part and the outside of the shaft is The relationship with the minimum gap t2 that is formed in the gap is always K tl<t. In the example 2 of FIG. It varies depending on the roundness size K. Now, if the roundness is an arc, the inner roundness of the corner part 25 of the movable part is R1, and the protrusion 13 of the guide part 11 is
If the roundness of the side is R3, then R1,) In the case of R1,
As shown in Figure 3, the minimum gap t is at point T, which is a perpendicular drawn from the center 0 of the roundness on the guide side to the inside edge of the movable part.
, I-give.

In the case of R1>R2, as shown in Fig. 4, the center of each roundness on the protruding part side of the guide part and on the part side of the movable part corner 08.02 t - Extension line of the connected line Upper pressure minimum gap t1
There is.

Although these minimum gaps vary from corner to corner, it is necessary that the largest one among them is still smaller than t2.

Note that 9 in each figure is a spring for returning the push button.

The button return means may be other means such as a leaf spring or rubber. Figure 5.6 shows one claw on the movable part and one on the shaft, respectively.
It is an explanatory diagram of an embodiment in which 0 is added.

For convenience, the present invention has been described only with reference to a push button having a square prism shape, but the present invention is not limited to this shape. Even if the push button corresponds to other polygonal shapes, circles, ellipses, etc., or various shapes close to these, the appropriate shape and number should be symmetrical in response to changes in these shapes. The present invention may include all pushbutton switches that satisfy the relationship 12>11 by combining a guide portion having a protrusion provided thereon and a movable portion. Therefore, in the present invention, the polygonal column shape includes the various shapes described above.

In contrast to forming a sliding part by providing a sliding part, a protruding part is provided inside the movable part at a symmetrical position toward the inner side.
A sliding portion may be provided between the guide portion and a part of the outer surface of the guide portion. In this case as well, the minimum clearance t in the sliding part
The relationship between 1 and t is always 12>1. needs to be set so that it bottoms out.

The relative shapes and positional relationships of the guide part, movable part, and sliding part as described above are the shapes and mutual relationships that can be achieved with the currently known technical level, as long as they meet the purpose of the present invention as a push button switch. You can use all of them as long as they are.

There are four locations, and these can be placed close to the outermost periphery of the pushbutton, so when pressing from the diagonal direction, there is less wobbling, and even if wobbling occurs, there is only one sliding part, so it is easy to slide. The stress received in the area is small.

Therefore, there is less wear on the sliding parts, and the durability of the switch can be dramatically increased.

Furthermore, even if the sliding part were to wear out due to abnormal stress, since the sliding part is on the outside of the guide part, there is no possibility that wear particles would enter the inside of the switch, unlike in conventional switches. There isn't. For the same reason, when using lubricant on the sliding parts, it is possible to prevent the lubricant from entering the inside of the switch and contaminating the contacts.

[Brief explanation of drawings]

1 to 6 are explanatory diagrams of the push button switch of the present invention. Figure 1.2.5.6 shows the structure of the switch of the invention. FIG. 1 is a sectional view taken along a plane including the axis, and FIG. 2 is a sectional view taken at the position shown in FIG. 3 and 4 are explanatory diagrams showing the state of the sliding part. 7 to 9 are schematic diagrams of conventionally known switches. 1. FIG. 9 is an explanatory diagram showing the entire state of stress concentration when pressure is applied in the diagonal direction of the switch metal in FIG. 8. In each figure, 1゛°° key top, 3°° switch off, 4°°.
Electrode, 6... Opposite electrode, 8... Electrode pressing shaft, 9
...Button return spring, 11...Guide section, 12.-
Movable part, 13... Protruding part, 14... Sliding part, 18
... Sliding shaft, 25 ... Corner Partial patent applicant Asahi Kasei Industries Co., Ltd. Figure 1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] The movable part has a polygonal prism shape that is open downward, an electrode pressing shaft formed approximately in the center, and a guide part provided in the main body and has a space inside. and outside the electrode pressing shaft, and the gap between the inside of the movable part and the outside of the guide part is minimum only at the sliding part provided at a substantially symmetrical position between the two parts, and,
A push button switch characterized in that this minimum gap is smaller than the minimum gap between the outside of the electrode pressing shaft and the inside of the guide part.