JPS5929313Y2 - push button switch - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a push button switch.

Among the push buttons arranged on the keyboard of cash registers, small electronic calculators with printers, etc., the push buttons that are frequently used (for example, the number button for O, the command buttons for +, 2, etc.) are as follows: Its operation is made larger than other push buttons in order to be able to perform the music.

Figure 1 shows a conventional push button switch.
1b is a large horizontal push button that is frequently used, and 1b is an ordinary push button. The ordinary push button 1b has 2 nail shafts, and the fishing shaft 2 has a bearing plate 3 (generally an equipment case).
It is slidably supported in a bearing hole 4 provided in K.

Reference numeral 5 indicates an elastic movable contact made of conductive rubber or the like attached to the lower end surface of the fishing shaft 2, 6 indicates a circuit board, and 7 indicates this circuit board 6.
The fr fixed contact is formed on the upper side to face the movable contact 5.

On the other hand, the large push button 1a is adjacent to the large push button 1a via two fishing rods 2, 2 which are protruded at the same spacing as the spacing between the bearing holes 4, 4 provided in the bearing plate 3. A movable contact 5, which is supported by two bearing holes 4 and 4 and which contacts and separates from a fixed contact 7 on the circuit board 6, is provided on the lower end surface of one fishing shaft 2 (however, a movable contact 5 is provided on the lower end surface of one of the fishing shafts 2. 2, 2 has a movable contact 5
(Some have a .)

Further, 8 in the figure is a return coil spring, and this spring 8 is provided for each fishing shaft 2, 2.

However, in the above-mentioned conventional push button switch, the entire length of the bearing holes 4 and 4 is formed to have approximately the same shape as the cross section of the fishing shaft 2°2. 1b'(r) There is no particular problem in the case of a 7j push button switch, but a large push button 1 with two fishing rods 2.
If the push button switch is equipped with ak, press the button 1 ak smoothly.
It had the disadvantage that it could not be operated by pressing.

That is, in a push button switch equipped with a push button 1a having two fishing rods 2, 2, when the center part of the push button 1a is pressed, the push button 1ak can be pressed down smoothly;
When the end of the push button 1a is pushed down to R, 5 as indicated by the arrow in the figure, this pushing down force also acts as a force to tilt the push button 1ak, so the push button 1a and the fishing rods 2, 2 are tilted toward the pushing end side. It turns out.

In this case, since there is some degree of play between the fishing shafts 2, 2 and the bearing holes 4.4 due to dimensional tolerances, variations in the distance between the shafts, etc., the fishing shafts 2.2 and the bearing holes 4.4 Tilt within;
When one of the fishing rods 2 hits the upper and lower edges a+b of the bearing hole 4, the push button 1a stops tilting at that point.

The fishing shaft 2 on the side closer to the pressing point is located at the upper and lower edges a of the optical meter bearing hole 4.

If it hits point b, sufficient pushing down force is applied to the fishing shaft 2 on the side closer to this pressing point, so this fishing shaft 2 will be pushed down while being guided by the two points a and b on the upper and lower edges of the bearing hole. Also, since the other fishing shaft 2 is free with respect to the bearing hole 4, the push button 1a can be pressed down smoothly.

However, if the fishing shaft 2 on the side far from the pressing point hits the upper and lower edges a and b of the bearing hole 4 first, this fishing shaft 2 will receive contact resistance with the upper and lower edges a and b of the bearing hole. Since the fishing rod 2 on the side closer to the pressing point is in a free state, the push button 1a tends to tilt further, and this causes the fishing rod 2 on the side farther from the pressing point and the upper and lower edges a of the bearing hole.

As a result, the contact pressure with button b is increased, making it impossible to press down the push button 1ak smoothly.

For this reason, it has conventionally been considered to apply grease to the fishing rods 2, 2, but applying grease causes dirt, and the grease must be reapplied periodically. , which is not very desirable.

This idea was devised in view of the above-mentioned circumstances, and its purpose is to connect the two adjacent bearing holes provided in the two fishing shaft bearing plates protruding below the push button. As a push-button switch, the push-button switch is slidably supported by the push-button switch and has a contact on the underside of at least one of the two fishing shafts that is opened and closed by raising and lowering the fishing shaft. To provide a push button switch which allows the fishing shaft on the side closer to the point to contact the upper and lower edges of a bearing hole first, and which allows the push button to be pressed down smoothly at all times.

An embodiment of this invention will be described below with reference to the drawings.

In Figure 2, 11 is a horizontally long large push button, 12.1
Reference numeral 2 denotes two fishing shafts protruding below the push button 11, 13 a bearing plate, 14, 14 two adjacent bearing holes 15 provided in the bearing plate 13, and 15 a return coil spring. .

16 is a circuit board provided under the bearing plate 13;
7 is an elastic insulating sheet made of rubber or the like provided on the circuit board 16, and 17a is a bulge formed on the elastic insulating sheet 17 so as to rise above the surface of the circuit board 16; are the two fishing rods 12, 12
It is located below one of the fishing rods 12.

Further, a movable contact 18 made of conductive rubber or the like is provided on the lower surface of the bulge 17a, and when the bulge 17a is pressed by the fishing shaft 2, the movable contact 18 is pressed onto the circuit board 16. 19gm of fixed contacts are formed.

On the other hand, two bearing holes 1 provided in the bearing plate 13
4 and 14, as shown in FIG. 3 and FIG. The cross section of the fishing rod 12 degrees 12 from the position slightly lowered from the upper end to the lower opening is formed to be thick,
The fishing shafts 12, 12 are slidably supported in the upper openings of the bearing holes 4, 4, respectively (however, there is some play in these parts due to dimensional tolerances and variations in the distance between the shafts).

Further, the lower portion of the bearing hole 14° 14 excluding the upper opening is not expanded over the entire circumference, but is expanded only in the direction opposite to the other bearing hole 14. It has been expanded to a shifted state.

In other words, the two bearing holes 14, 14 have their hole walls flush with each other over the entire area from the upper opening to the lower opening on the sides that are close to each other, and on the side opposite to this side, the upper opening opens. The expanded portion 14a is expanded except for the expanded portion 14a.

14a serves as a relief against the inclination of the fishing shafts 12, 12.

Therefore, in the push button switch of this embodiment, when the center part of the push button 11 is pressed, the fishing shaft 12 12 is flush with the hole wall that is flush with the upper opening and upper and lower ends of the bearing holes 14, 14. As a result, the push button 11 is smoothly pressed down.

On the other hand, when the end of the push button 11 is pressed, the push button 11 and the fishing rods 12, 12 are tilted and pushed down, but in this case, no matter which end is pressed, as shown in FIGS. 5 and 6. The fishing shaft 12 on the side closer to the pressing point comes into contact with the upper and lower edges a and bK of the bearing hole 14 first.

Note that in FIGS. 5 and 6, arrows indicate the direction of depression.

In this way, the fishing shaft 12 on the side closer to the pressing point first hits the upper and lower edges a and bK of the bearing holes because the lower parts of the two bearing holes 14 and 14 are in the opposite direction from the other bearing hole 14. This is because when the push button 11 is tilted, the lower end of the fishing rod 12 closer to the pressing point is displaced to the side opposite to the expanded portion 14a and hits the lower edge of the bearing hole, causing the upper and lower ends of the bearing hole to move upward and downward. Although it is regulated by the edge ayb, the lower end of the fishing shaft 12 on the side far from the pressing point is displaced toward the expanded portion 14a, so this fishing shaft 12 does not come into contact with the lower edge bK of the bearing hole, and is therefore far from the pressing point. The side fishing shaft 12 is located at the upper and lower edges a of the bearing hole.

It is not regulated by b.

Since a sufficient pushing down force is applied to the fishing shaft 12 on the side closer to the pressing point, this fishing shaft 12 is pushed down while being guided by the upper and lower edges a and b of the bearing hole. Since the shaft 12 is free with respect to the bearing hole 14, the push button 11 can be pressed down smoothly.

In the above embodiment, the movable contact 18 is connected to the elastic insulating sheet 1.
Although the movable contact 18 may be provided at the lower end of the fishing shaft 12 in the same manner as a conventional push button switch, the movable contact 18 and the fixed contact 19 are connected to both the fishing shafts 12, 1.
It may be provided below 2.

Further, in the above embodiment, the expanded portion 14a of the bearing holes 14, 14,
14a is formed at a position slightly lower than the upper end of the bearing holes 14, 14, and the upper opening of the bearing holes 14, 14 has approximately the same shape as the cross section of the fishing shafts 12, 12, As long as the lower opening is expanded in the opposite direction to the other bearing hole 14, an inclined surface may be formed between the lower end edge of the expanded portion 14a and the upper edge of the bearing hole, for example.

Since the push button switch of this invention is as described above, it is supported by two adjacent bearing holes provided in two fishing shaft bearing plates protruding below the push button.
When the end of the push button is pressed, the fishing rod on the side closer to the pressing point always hits the upper and lower edges of the optical meter bearing hole, so that the push button can always be pressed down smoothly.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a conventional push button switch, Fig. 2 is a longitudinal sectional front view showing an embodiment of this invention, and Figs. 3 and 4 are a longitudinal sectional front view and a plan view of a bearing plate. FIGS. 5 and 6 are longitudinal sectional front views of the push button with the end thereof pressed. 11...Push button, 12...Fishing shaft, 13.
...Bearing plate, 14...Bearing hole, 14a.
...Expansion part, 18...Movable contact, 19.
...Fixed contact.

Claims (1)

[Scope of utility model registration request] Two fishing shafts protruding below the push button are slidably supported in two adjacent bearing holes provided in a bearing plate, and the fishing shaft is raised and lowered under at least one of the two fishing shafts. In the push button switch provided with a contact that is opened and opened by
The two bearing holes that support the book button shaft i have upper openings formed to have approximately the same shape as the cross section of the fishing shaft, and lower openings each expanding in the opposite direction to the other bearing hole. A push button switch that is thicker than the cross section of the shaft.