JP3438839B2 - Push button switch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternate type push button switch that can be used in various electronic devices and the like.

[0002]

2. Description of the Related Art An alternate type push button switch, commonly referred to as a push switch, is driven by a push button, as shown in the prior art, for example, in U.S. Pat. No. 4,740,661 issued to this applicant. A drive pin rotationally drives a converter having a push rod urged to the outside by a spring, and the push rod of the converter rotationally drives a movable contact piece supporting the movable contact piece to move the movable contact piece. It has a complicated structure in which the common contact piece connected to is selectively conducted to either of the two fixed contact pieces. Therefore, the assembly of the switch is troublesome. Further, since the movable contact piece and the fixed contact piece are always in contact with each other at the same portion, there is a problem that dust adheres to the contact piece during a long-term use and a contact failure easily occurs, and the operation reliability is low. .

In order to solve the problem, the applicant of the present invention proposed an alternate type push button switch (Japanese Patent Application No. 4-32642) on May 19, 1992. In the push button switch proposed earlier, its vertical section is shown in FIG.
2, the bottom opening of the insulating case 13 is closed by the bottom plate 14, and the contact pieces 15, 16 and 17 are led out as terminals through the bottom plate 14. As shown in FIG. ing. A movable contact piece support 19 is provided on the bottom plate 14.
However, an elastic movable contact which is arranged in a seesaw manner with a lower end portion of a protrusion formed in the center of the lower surface as a fulcrum and is bent in an inverted U shape in a receiving groove 19S formed in the lower surface of the movable contact piece support 19. The piece 18 is attached and held. When the movable contact piece support 19 moves in a seesaw manner, the movable contact piece 18 also rotates while being in elastic contact with the common contact piece 15 protruding inside the bottom plate 14, and both ends of the movable contact piece slide with the fixed contact pieces. Contact and dissociate.

The movable contact piece support 19 is formed with a mountain having an apex at the center of its upper surface, and the slopes 19 of the mountains have opposite slopes.
A and 19B form a sliding guide passage for the tip of the pin 21. Climbing slopes 19A extending from the bottom of those slopes to both ends of the movable contact piece support 19 respectively.
A and 19BB are formed as collision surfaces. The movable contact piece support 19 is a side wall 1 that sandwiches the slopes 19A and 19B in the width direction.
A recess 19R is formed at the center of the 9W (see FIG. 2) in the longitudinal direction. A spring receiving plate 22 is disposed on the movable contact piece support 19, and triangular plate-like support protrusions 2 are formed on the lower surface of the spring receiving plate 22 so as to face each other with a space therebetween.
2T is formed and engages with the concave portion 19R of the movable contact piece support, and enables the seesaw movement of the spring receiving plate 22.

The pin 21 is arranged so as to pass through the slit 22A formed in the spring receiving plate 22, and the flange 21A formed at the upper end of the pin 21 has the push button 12 housed in the push button housing portion 11 of the insulating case 13. The upper end of the truncated cone coil spring 23 elastically presses and supports the bottom surface (the most recessed portion) of the pin receiving hole 12A formed on the back side of the. The upper end of the spring receiving plate 22 fixedly holds the lower end of the coil spring 23.

When the push button 12 is projected to the outermost side,
The lower end of the pin 21 opposes either one of the slopes 19A and 19B (for example, 19B) formed on the movable contact piece support 19 with a space. By pushing down the push button 12, the lower end of the pin 21 comes into contact with the one slope 19B,
It slides down and collides against the collision surface 19BB to invert the inclination of the movable contact piece support body 19, and the inclination of the spring receiving plate 22 is also inverted at the same time, so that the movable contact piece 18 and the fixed contact pieces 16 and 17 are inverted. The contact state with is changed. Push button 1
When 2 is released, the movable contact piece support 19 is moved by the spring receiving plate 22.
While the tilt direction of the push button 1 is held, the push button 1
2 and the pin 21 return, and the lower end of the pin 21 is the other slope 1
It faces 9A with a space.

In this conventional example, the spring receiving plate 22 is constructed so that it can swing freely, so that the spring receiving plate 22 not only supports the lower end of the spring 23 on its upper surface, but also has a movable contact piece. It also functions as a diverter that can switch the direction of the seesaw movement of the support 19. According to this structure, every time the push button 12 is pressed, the pin 21 is alternately engaged directly with the slopes 19A and 19B formed on the movable contact piece support 19, and the tip of the pin 21 is fixed by the slopes 19A and 19B. Collision surface 19AA on the end side of the movable contact piece support 19, 1
9BB, the movable contact piece support 19 and the movable contact piece 18 are moved in a seesaw motion by applying a pressing force to the end of the movable contact piece support 19. Moving piece 1 by this seesaw movement
8 alternately connects the common contact piece 15 to the fixed contact pieces 16 and 17 to perform an alternate operation.

[0008]

The feature of the push button switch proposed above is that the spring receiving plate 22 is provided with the spring 2.
3 and a structure for giving a bistable effect to the movable contact piece support body 19 and a structure for directly driving the movable contact piece support body 19 by the lower end of the pin 21 are provided independently of each other.

In this way, the spring receiving plate 22 is structured so as to be swingable, and the biasing force of the repulsion spring 23 is applied to the movable contact piece support 19 via the spring receiving plate 22 to perform a seesaw motion. A downward force (a direction toward the bottom plate 14) can be applied to the movable contact piece support 19. The downward contact force allows the movable contact piece 18 to perform a bistable seesaw operation.

Further, due to the structure of the movable contact piece 18, the movable contact piece 18 slides with respect to the fixed contact pieces 16 and 17 every time it comes in contact with and separates from the fixed contact pieces 16 and 17, so that a so-called self-cleaning operation is performed. As a result, contact failure of the contacts is unlikely to occur for a long period of time, and there is an advantage that the reliability of the contacts can be improved. By the way, in the previously proposed push button switch, the push button 12, the pin 21, the coil spring 23, and the spring receiving plate 22 are sequentially inserted into the insulating case 13 with the bottom opening of the insulating case 13 facing upward during assembly, and then the movable contact is moved. The movable contact piece 18 is supported by the piece support 19 and is then inserted. Finally, the bottom plate 14 covers the bottom opening to complete the assembly.

However, the spring receiving plate 22 is not positioned so as to be freely swingable in the insulating case 13, and the spring receiving plate 22 may not be incorporated into the coil spring 23 in a proper posture. In this respect, there is a drawback that assembly is troublesome. Therefore, an object of the present invention is to provide a push button switch which is easy to assemble.

[0012]

According to the present invention, a pin accommodating hole is formed in the lower end surface of a push button having a lower part inserted into the push button accommodating portion, and the upper end of the pin is elastically pinned by a coil spring. The movable contact piece support, which holds the movable contact piece in the switch accommodating portion that is integral with the push button accommodating portion by the lower end of the pin, performs a seesaw motion to thereby move between the two fixed contact pieces and the common contact piece. In the push button switch that switches between conduction, a spring receiving plate that fixes the lower end of the spring is provided in the switch housing so that it can slide up and down, and the spring receiving plates at both ends of the spring receiving plate are always in a posture parallel to the bottom plate. The legs for maintaining are formed so as to extend downward. A converter means is provided between the lower surface of the spring receiving plate and the upper surface of the movable contact piece support, and the repulsive force of the coil spring received by the spring receiving plate is applied to the movable contact piece support by the converter means, and its inclination is Hold bistable.

[0013]

According to this structure, since the movement of the spring receiving plate can be limited to simply moving up and down, the posture can always be maintained in a posture parallel to the bottom plate. Therefore, the spring receiving plate can be assembled in a fixed posture when assembled in the insulating case, so that the assembly can be reliably carried out.
The advantage is that the assembly work can be significantly reduced.

[0014]

3 to 10 show the structure of a first embodiment of a push button switch according to the present invention. In FIG. 3 to FIG. 10, parts corresponding to those in FIG. 1 and FIG. The insulating case 13 is a box-shaped switch accommodating portion 10 made of an insulating resin material, and a cylindrical pushing member integrally formed on the upper surface of the switch accommodating portion 10 with an internal space in common, as described in the related art. Button housing 1
1 and 1. The inner diameter of the push button housing 11 is smaller than the inner side of the switch housing 10. Push button 12
Has a pin receiving hole 12A formed at the center of its lower end surface,
A pin 21 and a truncated cone-shaped coil spring 23 are housed in the pin housing hole 12A. Therefore, the push button 12 is pushed upward in the drawing by the repulsive force of the spring 23, and the flange portion 21A formed at the tip of the pin 21 is pressed by the spring 23 into the bottom surface of the pin receiving hole 12A (hole 1 in the drawing).
2A looks like the ceiling surface of hole 12A because it is upside down, but the most recessed part of the hole is pressed against the bottom or bottom regardless of the orientation of the hole)
Since it is pressed onto the upper part of A, the pin 21 is swingably supported.

In the present invention, the rectangular spring receiving plate 22 formed of an insulating material for fixedly supporting the lower end of the spring 23 is accommodated in the switch accommodating portion 10 so as to be slidable on its inner wall surface. A pair of legs protruding from both ends of the spring receiving plate 22 in the direction toward the bottom plate 14 and sliding on the inner wall surface of the switch housing 10 to maintain the posture of the spring receiving plate 22 in a state parallel to the bottom plate 14. The portion 22B is integrally formed. 5 and 6 show a detailed structure of the spring receiving plate 22. A slit 22A through which the pin 21 is inserted is formed in the longitudinal direction at substantially the center of the rectangular spring receiving plate 22. Spring support plate 2
A pair of protrusions 22C are formed on the upper surface of 2 so as to face each other with the slit 22A interposed therebetween. A spring 23 is attached to the protrusion 22C.
The lower end of the spring 23 is engaged to prevent displacement of the spring 23.
A protrusion 22D is formed outside the lower end of the leg 22B. The protrusion 22D has the push button 12 at the uppermost position, and when the spring receiving plate 22 is inserted into the switch accommodating portion 10 in a state where the pressing force against the spring 23 is minimum, the elasticity of the leg portion 22B causes the switch accommodating portion 10 to move. It is provided in order to prevent the spring receiving plate 22 from coming out of the switch accommodating portion 10 due to the repulsive force of the spring 23.

As shown in FIG. 6, engaging V-grooves 22E are formed on the lower surface of the spring receiving plate 22 in a direction traversing the slits 22A, and both ends of the engaging V-grooves 22E are protruded downward so as to face each other. The piece 22F is formed. Projection piece 22F
6 are formed so as to project inwardly from each other and extend parallel to the lower surface of the spring receiving plate 22 along the lower end of
As shown by the dotted line, the converter 24 can be attached. As shown in FIG. 7, the converter 24 is an elongated plate piece 2.
4C and arms 24D that extend at right angles from the vicinity of both ends thereof, and a recess 24A is formed between these arms 24D. Protrusions 24 protruding outward from each other from the tips of the arms 24D.
B is formed. The tip of the arm 24D of the conversion element 24 is engaged with the engagement V groove 22E of the spring receiving plate 22, and the protrusion 24B.
Engage with the protrusion 22G formed on the spring receiving plate 22, and the conversion element 24 engages with the engaging V groove 22E below the spring receiving plate 22.
Can be mounted swingably around. In this way, since the conversion element 24 can be attached to the spring receiving plate 22 in advance, the work of assembling the push button switch is facilitated. By selecting the opening angle of the engaging V-shaped groove 22E to a predetermined angle, the swing range of the converter 24 is limited to a necessary minimum, thereby the movable contact piece support 19 with respect to the lower end of the converter 24 is assembled. The position of the engagement groove 19C described later is easily adjusted.

As shown in FIG. 8, the movable contact piece support 19 is formed of an insulating material in a block shape, and has stepped portions 19S projecting from the lower portions of the two opposite side surfaces thereof in a direction perpendicular to these side surfaces. There is. A short shaft 19G that protrudes from these side surfaces and serves as a center of rotation is formed in the lower central portion of the two side surfaces that face each other at a right angle to the side surface on which the step portion 19S of the support body 19 is formed. Parallel accommodating grooves 19E and 19F for mounting the two movable contact pieces 18 on the lower end surface are formed passing both step portions 19S. The upper surface of the support body 19 has slopes 19A and 19B having peaks having peaks extending in a direction perpendicular to the receiving grooves in the center, and collision slopes having opposite slopes forming V valleys with the slopes on both sides of the slopes. 19AA and 19BB are formed. These points are similar to those of the prior art of FIGS. In the present invention, the sidewalls 19W projecting upward beyond the peaks of the ridges are formed at both ends in the extending direction of the V valleys, and further, the engaging grooves 19C penetrating both side walls 19W through the peaks of the ridges. Are formed.

The lower edge of the plate piece 24C of the converter 24 is shown in FIG.
Is engaged with the engaging groove 19C formed in the upper part of the movable contact piece support 19 shown in FIG.
The repulsive force of the spring 23 received via the movable contact piece support 1
It is given to the fulcrum 19D of 9 and the fixed contact piece 16 or 17 on the falling side. The sliding direction of the pin 21 is guided by the inclined surfaces 19A and 19B on opposite sides of the engaging groove 19C which are opposite to each other, and the movable contact piece support 19 is moved in a seesaw motion each time the push button 12 is pressed.

A housing groove 19 on the lower surface of the movable contact piece support 19.
The movable contact pieces 18 shown in FIG. 9 are attached to E and 19F, respectively. The movable contact piece 18 is made of an elastic metal plate and has two elongated contact pieces 18A and 18B facing each other with a space therebetween.
And has a structure in which they are connected by a connecting portion 18C at an intermediate portion of their upper edges. The center lower ends of the contact pieces 18A and 18B project downward and serve as a common contact portion 18D that elastically sandwiches the common contact piece 15 (FIG. 10). Contact piece 18
Lower ends of A and 18B, which are separated from each other (referred to as free ends) 18AE and 18BE, are outwardly bent to form a guide 18F. The guide 18F guides the fixed contact piece 16 and 17 (FIG. 10) is sandwiched between the free ends 18AE and 18BE. The two movable contact pieces 18 have two intermediate portions between the two receiving grooves 1 of the support body 19.
9E and 19F are respectively attached to the free ends 18AE and 1
8BE has lower edges thereof extending at the height of the upper surface of the stepped portion 19S of the support 19 and further protruding from the tip position of the stepped portion 19S. The movable contact piece 18 is accommodated in the housing groove 19E, 1 by engaging a protrusion 18G formed on the lower part of the root of the free end portion 18AE, 18BE so as to project outward and engaging with the upper surface of the step portion 19S.
It is kept in 9F.

As shown in FIG. 10, a rectangular bottom plate 14
On the upper surface of the trapezoidal bearing plate 14A at the center of its long side
Are formed to project. A bearing recess 14C is formed at the center of the top surface 14B of the bearing plate 14A. This recess 14C
Receives the semicircular shaft 19G (FIG. 8) formed on the movable contact piece support 19 and supports the fulcrum 19D on the bottom surface of the recess 14C,
The movable armature support 19 is allowed to move in a seesaw motion. In addition,
A groove 14D is formed on the peripheral side surface of the bottom plate 14. The groove 14D is provided to prevent flux from entering the switch accommodating portion 10 when it is mounted on a printed circuit board, temporarily fixed to the printed circuit board, immersed in a solder bath, and soldered. is there. Further, protrusions 14E are formed at appropriate places on the peripheral side surface of the bottom plate 14, and these protrusions 14E are engaged with the holes formed in the insulating case 13 to prevent the protrusions from coming off.

With the above structure, the push button 12
In the state of FIG.
4, and the axis of the pin 21 is stable in the direction intersecting the rotation axis of the movable contact piece support 19, as shown by the broken line in FIG. In this state, pin 21
Of the movable contact piece 18 faces the inclined surface 19A or 19B on the side where the free end portion of the movable contact piece 18 is separated from the fixed contact piece with a space. Now, the movable contact piece 18 and the movable contact piece support 19 are shown in FIG.
Assuming that the posture is in the upper right direction opposite to the state shown by the solid line, the tip of the pin 21 is engaged with the sloped surface 19B by pressing the push button 12, and the tip of the pin 21 is
It slides on 9B and moves to the right, abuts against a substantially orthogonal collision surface 19BB formed at the lower end of the sloped surface 19B, and applies a pressing force. By this pressing force, a clockwise operating force is applied to the movable contact piece support 19, and the movable contact piece support 19 rotates clockwise about the fulcrum 19D. When the movable contact piece support 19 passes through its horizontal posture, the converter 24 is in a vertically standing state. At this time, the spring receiving plate 22 moves to the uppermost position. If this state shifts to the right-downward attitude even slightly, the movable contact piece support 19 is rapidly rotated clockwise by the biasing force of the spring 23 received through the converter 24, and the movable contact piece support 19 is moved to the right end. The part rotates until it abuts the bottom plate 14, stops at the abutting position, and becomes the state shown by the solid line in FIG. At this time, the two movable ends 18AE and 18BE of the movable contact piece 18 sandwich and contact the fixed contact piece 17, and the common contact piece 15 and the fixed contact piece 17 are switched to a conductive state.

When the pressing operation force applied to the push button 12 is released in the state of FIG. 3, the push button 12 returns upward due to the repulsive force of the spring 23. At this time, the tip of the pin 21 moves up the slope 19B and returns to the position of the recess 24A of the diverter 24. When the push button 12 is pressed in this state, the tip of the pin 21 is inclined 1
9A, guided by the inclined surface 19A, the tip of the pin 21 is moved to the left and abut against the collision surface 19AA. When the push button 12 is further pressed in this state, the movable contact piece support 19 starts rotating in the counterclockwise direction. When the movable contact piece support 19 shifts slightly to the left downward attitude from the horizontal attitude, the movable contact piece support 19 rapidly rotates due to the biasing force of the spring 23 and is inverted to the left downward attitude. At this time, the movable contact piece 18 and the two free end portions 18AE facing each other are
The fixed contact piece 16 is sandwiched between 8BE, and the fixed contact piece 16 and the common contact piece 15 are switched to a conductive state.

In the first embodiment shown in FIGS. 3 and 4, the spring contact plate 22 which receives the repulsive force of the spring is inclined to the movable contact piece support member 19 through the swingable converter 24. Although a case where a pressing force for holding bistable is given is shown, the vertical cross section of the embodiment in the case of omitting the converter 24 and directly pressing the movable contact piece support body 19 with the spring receiving plate 22 is shown. FIG. 11 shows a cross section taken along line XII-XII of FIG.
Shown in. This second embodiment is different from the first embodiment of FIGS. 3 and 4 except that the converter 24 is omitted and the lower surface of the spring receiving plate 22 and the upper surface of the movable contact piece support 19 are slidably deformed with respect to each other. This is the same as the first embodiment. Therefore, description of the configuration and operation common to these two embodiments will be omitted, and only different points will be described in detail.

In the second embodiment, the spring receiving plate 22 has, as its cross section in the width direction shown in FIG. 13, a protruding piece for engaging the converter in FIG. 6 on the lower surface of the rectangular plate portion. 22F and the engaging groove 22E are not formed, and the lower surface thereof is flat. Further, as shown in FIG. 14 corresponding to FIG. 8 of the first embodiment, the movable contact piece support 19 does not have an engaging groove 19C that engages with the converter 24 in FIG. Formed on the upper ends of the two side walls 19W perpendicular to the rotation axis of the movable contact piece support body 19 are mountain-shaped sliding protrusions 19T which are the highest peaks in the center of the side walls 19W sandwiching the slopes 19A and 19B through which the tips of 21 pass. The apex of the sliding protrusion 19T is in sliding contact with the lower surface of the spring receiving plate 22. The other parts of the movable contact piece support 19 are the same as in FIG. Due to the repulsive force of the spring 23, the lower surface of the spring receiving plate 22 is always kept in contact with the apex of the sliding protrusion 19T of the movable contact piece support 19 as shown in FIG. Movable contact piece support 1 by pin 21
As the inclination of 9 is reversed, the apex of the sliding protrusion 19T pushes up the spring receiving plate 22 and exceeds the center line XII-XII, and the downward repulsive force of the spring 23 received via the spring receiving plate 22 causes Upon receiving the rotational couple (moment) in the reversing direction of the sliding protrusion 19T, the reversing of the movable contact piece support body 19 is completed. The tip of the pin 21 slides down the slope of the movable contact piece support 19 on the opposite side to the above, collides with the collision surface, and the inclination is maintained in that state.

FIG. 15 shows a third embodiment which is a modification of the embodiment of FIG. 3, and the corresponding parts are designated by the same reference numerals. In this embodiment, a pair of legs 12B extending downward in parallel with the central axis from a diametrically opposite position of the lower end of the cylindrical push button 12 in FIG. 3 are integrally formed.
An engaging projection 12C is formed on the outer side of the lower end of the spring receiving plate 2
The two slits 22A are expanded to the same extent as the lower diameter of the push button 12, and a pair of legs of the push button is deformed so as to be inserted and engaged with the slit 22A. When inserting the pair of legs 12B into the slit 22A, the legs 12B are elastically bent inwardly and inserted into each other, and after the insertion, the engagement protrusions 12C are engaged with both ends of the slit 22A. It is said that they will not come off. In this example, the lower surface side engaging recesses 22H of the spring receiving plate 22 are formed at both ends of the slit 22A so that the legs 12B do not project too much downward from the lower surface of the spring receiving plate 22, and engage with the engaging protrusions 12C of the legs 12B. To meet.

According to this embodiment, the pin 21 and the spring 23 are inserted into the pin accommodating hole 12A of the push button 12 which is turned upside down, and then the pair of legs 12B are bent inward, so that the spring receiving plate 22 is formed. 22C is engaged with the end of the coil spring 23, inserted into the slit 22A of the spring receiving plate 22 against the repulsive force of the spring, and the engaging protrusion 12C of the leg 12B and the engaging recess 22H of the spring receiving plate 22 are inserted. Engage and. As a result, the push button 12, the pin 21, the spring 23, and the spring receiving plate 22 to which the switching element 24 is attached are preliminarily coupled to each other to form a subassembly, which can be easily handled. The combined subassembly is mounted on the case 13, and the common contact piece 15 and the fixed contact piece 16 or 17 are elastically moved by the movable contact piece 18 of the movable contact piece support 19 to which the movable contact piece 18 is attached in advance. By sandwiching it, the movable contact piece support 19 is attached to the bottom plate 14, and the bottom plate 14 covers the bottom opening of the case 13 in which the above-described subassembly is incorporated. At this time, the converter 24 is tilted in the direction corresponding to the preset tilt of the movable contact piece support 19 at an angle defined by the engagement V groove 22E. As described above, in this embodiment, the push button 12, the pin 21, the spring 23, the spring receiving plate 22.
Since it is sufficient to mount the switching element 24 and the switching element 24 on the case 13 as subassemblies that have been coupled to each other in advance, the work is easy. In this case, it is not necessary to provide the projection 22D shown in FIGS. 3 and 5 on the leg 22B of the spring receiving plate 22. Absent.

FIG. 16 shows a fourth embodiment in which the second embodiment of FIG. 11 is modified in the same manner as the case of FIG. 15, and the same reference numerals are given to corresponding parts. That is, the movable contact piece support 19
Has a projection 19T formed on the upper surface thereof and is configured to be slidably engaged with the lower surface of the spring receiving plate 22 so that the movable contact piece support 19 also serves as a converter. However, in this example, arc-shaped protrusions 22F are formed on both side edges of the lower surface of the spring receiving plate 22 at positions similar to the protrusions 22F shown in FIGS. 5 and 6, and are movable with the arc-shaped peripheral surfaces. Contact piece support 19
Bistability of the movable contact piece support body 19 is enhanced by sliding the two projections 19T. Further, similarly to the embodiment of FIG. 15, the leg 12B is extended downward from the lower end of the push button 12 and inserted into the slit 22A of the spring receiving plate 22,
The engagement protrusion 12C and the engagement recess 22H are engaged at both ends of the slit. The configuration and operation of the other parts are the same as those described in the embodiment of FIGS. 11 and 15,
The description is omitted. The assembling procedure of this embodiment is the same as that of the case of FIG. 15, but the assembling becomes easier because the converter 24 is not provided independently. Although the pair of legs 12B of the push button 12 is inserted into the slit 22A of the spring receiving plate 22 in the embodiments of FIGS. 15 and 16, the spring receiving plate 22 has a through hole for insertion engagement separately from the slit 22A. However, they may be insert-engaged with them.

[0028]

As described above, in the first and third embodiments of the present invention, the leg portions 22B extending downward from both ends of the spring receiving plate 22 are formed, and these leg portions 22B form the spring receiving plate. The posture of 22 is maintained in a posture parallel to the bottom plate 14, and the contact state of the movable contact piece support 19 is bistable by the converter 24 which receives the repulsive force of the spring 23 through the lower surface of the spring receiving plate 22. Since it is held, the posture of the spring receiving plate 22 during assembly is fixed (the bottom plate 14
It can be installed only in a posture parallel to. As a result, assembly is facilitated and mass production is facilitated. On the other hand, the upper end of the movable contact piece support 19 is projected,
According to the second and fourth embodiments in which the movable contact piece support 19 is also slidably in contact with the lower surface of the spring receiving plate 22 and also serves as the converter, the number of parts is reduced and the assembly is further facilitated. It will be easier.

Further, as in the first and second embodiments, the projection 22D is formed at the lower end of the leg portion 22B formed on the spring receiving plate 22.
And the protrusion 22D is pressed against the inner wall of the switch accommodating portion 10 by utilizing the elasticity of the leg portion 22B.
Since the structure of temporarily fixing the position of 2 is adopted, it is possible to temporarily fix the state in which the push button 12, the pin 21, the repulsion spring 23, and the spring receiving plate 22 are assembled in the push button housing portion 11 and the switch housing portion 10. . As a result, there is an advantage that the assembling work can be performed more easily.

Alternatively, as in the third and fourth embodiments, a pair of legs 12B is formed extending downward from the lower end of the push button 12 and is inserted into and engaged with the slit 22A of the spring receiving plate 22. As a result, the assembly work can be facilitated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view for explaining an example of a conventional push button switch.

FIG. 2 is a vertical sectional view taken along line II-II in FIG.

FIG. 3 is a vertical sectional view showing the first embodiment of the push button switch according to the present invention with the push button 12 pushed down.

FIG. 4 is a vertical cross-sectional view taken along line IV-IV in the state where the push button 12 is returned to the upper position in FIG.

5 is a perspective view for explaining the structure of a spring receiving plate 22 used in the embodiment of FIG.

6 is a cross-sectional view for explaining a detailed structure of a spring receiving plate 22 used in the embodiment of FIG.

7 is a front view for explaining the structure of a converter 24 used in the embodiment of FIG.

8 is a perspective view for explaining the structure of a movable contact piece support body 19 used in the embodiment of FIG.

9 is a perspective view for explaining the structure of a movable contact piece 18 used in the embodiment of FIG.

10 is a perspective view for explaining the structure of the bottom plate 14 used in the embodiment of FIG.

FIG. 11 is a vertical sectional view showing a second embodiment of the push button switch according to the present invention in a state where the push button 12 is pushed down.

12 is a vertical sectional view taken along the line XII-XII in the state where the push button 12 is returned to the upper position in FIG.

13 is a sectional view for explaining the structure of a spring receiving plate 22 used in the embodiment of FIG.

14 is a movable contact piece support 19 used in the embodiment of FIG.
3 is a perspective view for explaining the structure of FIG.

FIG. 15 is a vertical sectional view showing a third embodiment of the push button switch according to the present invention, which is a modification of the embodiment of FIG. 3, in a state where the push button 12 is returned upward.

16 is a vertical sectional view showing a fourth embodiment of the push button switch according to the present invention, which is a modification of the embodiment of FIG. 11, in a state in which the push button 12 is returned upward.

[Explanation of symbols]

10 Box-shaped switch housing 11 Cylindrical push button housing 12 push button 12A pin receiving hole 12B leg 12C engagement protrusion 13 Insulation case 14 Bottom plate 15 common armature 16,17 Fixed contact piece 18 Elastic movable contact piece 19 Movable contact piece support 19A, 19B slope 19AA, 19BB Collision surface 19C engagement groove 19D fulcrum 19T sliding protrusion 19W side wall 21 pin 22 Spring support plate 22A slit 22B leg 22C protrusion 22D protrusion 22EV groove 22F projecting piece 22G ridge 22H engagement recess 23 Coil spring 24 convertor 24A recess 24B protrusion 24C strip 24D arm

Claims (10)

(57) [Claims] 1. (a) A box-shaped switch accommodating portion having an opening on the bottom surface, and a push button accommodating portion integrally formed on the switch accommodating portion so as to share an internal space and having an upper surface opening on the upper surface. (B) has a tip portion that is slidably accommodated in the push button accommodating portion and protrudes forward and backward from the upper surface opening, and has a pin accommodating hole in the lower end surface. A push button, and (c) a bottom plate that closes the bottom opening of the insulating case, and a common contact piece that is fixed through the center of the length direction, and both sides of the common contact piece in the length direction. A bottom plate provided with first and second fixed contact pieces that are fixed through at a distance; and (d) rotatable in contact with the common contact piece protruding inside the bottom plate. A movable contact piece and (e) an insulator, and straddles the movable contact piece. To hold it and form peaks on the upper surface
And a second slope, and third and fourth slopes extending from the lowermost ends of the first and second slopes in directions opposite to each other and away from each other, and are formed on the bottom plate around the rotation axis. A movable contact piece support movably supported, and (f) one end of which is inserted into the pin receiving hole formed on the lower end surface of the push button and the other end of which is formed on the movable contact piece support. By facing the opposite one of the first and second slopes and pressing the push button, the other end slides on one of the facing first and second slopes. Selecting the movable contact piece from the first and second fixed contact pieces by colliding with the corresponding one of the third and fourth inclined surfaces of the movable contact piece support to move the movable contact piece support in a seesaw motion. The pin that switches the physical contact state, and It is composed of a plate-shaped body of a non-shaped shape, and a slit for allowing the pin to swingably move in the longitudinal direction of the plate-shaped body is formed at substantially the center of the plate-shaped body. From the spring receiving plate having a pair of legs that respectively project toward the bottom surface along the inner wall surface of the switch accommodating portion, and (h) is provided so as to surround the outer periphery of the pin, and one end of which is located in the pin accommodating hole. When inserted, the one end of the pin is brought into pressure contact with the bottom surface of the pin accommodating hole, and the other end is fixed to the upper surface of the spring receiving plate to give the push button a restoring force for the pressing operation, and at the same time, the spring receiving plate. A coil spring that applies downward pressure contact force to (i) the upper end swingably engages the lower surface of the spring receiving plate,
A push-button switch comprising: a lower end engaging with the movable contact piece support, and a converter means for holding the inclination of the movable contact piece support in a bistable state. 2. The diverter means is swingably engaged with a first engaging groove formed on a lower surface of the spring receiving plate and parallel to a direction of a rotation axis of the movable contact piece support. Has an upper end and a lower end that swingably engages with a second engaging groove formed along the peak of the mountain formed by the first and second slopes on the upper surface of the movable contact piece support. The pushbutton switch according to claim 1, wherein the pushbutton switch is a plate-shaped converter, and a recess through which the lower end of the pin passes is formed at the center of the upper end of the converter. 3. A pair of projecting pieces projecting downward from both ends of the first engaging groove on the lower surface of the spring receiving plate and facing each other, and projecting inwardly facing each other at the lower end portions of the pair of projecting pieces. , A protrusion formed in parallel with the lower surface, engaging protrusions protruding outward from each other are formed at upper ends of both ends of the converter, and the engaging protrusion engages with the protrusion. The push button switch according to claim 2, wherein the switch is held so as to be swingable. 4. A box-shaped switch having an opening on the bottom surface thereof.
Sharing the internal space with the accommodating part and the switch accommodating part
Push button housing that is integrally formed and has an upper surface opening
An insulating case including a container, and (b) the push button housing is slidably accommodated in the upper surface.
It has a tip that protrudes forward and backward from the opening and
A push button with a pin receiving hole formed on the end face, and (c) a bottom plate that closes the bottom opening of the insulating case.
There is a common contact piece fixed through the center of the length.
And on both sides of the common contact piece in the length direction,
A first and a second fixed contact piece which are fixed by penetrating through
The bottom plate that is mounted on the bottom plate, and (d) the common contact piece that protrudes inside the bottom plate.
A movable contact piece that can be rotated while touching it, and (e) formed of an insulating material, straddling the movable contact piece.
The first of the opposite slopes that holds it and forms a mountain on the upper surface
And the second slope, and from the lowest end of these first and second slopes
A third and a third that extend in a direction away from each other with a reverse slope to them
4 slopes and the first and second slopes sandwiched between them
The top of the two angled sidewalls is the highest peak in the center
A mountain-shaped sliding protrusion is formed, and this sliding protrusion
It is configured to make sliding contact with the lower surface of the plate, and
A movable contact supported so that the seesaw can move around the rotation axis.
A piece support, the pin yield of (f) one end of which is formed on the lower end surface of the push button
Is inserted into the through hole and the other end is formed on the movable contact piece support.
And one of the above-mentioned first and second slopes which are in opposite directions to each other
By facing and pressing the push button,
Slide on one of the first and second slopes with opposite ends
Corresponding to the third and fourth slopes of the movable contact piece support.
The movable armature support to move in a seesaw motion.
Select the movable contact piece from the first and second fixed contact pieces.
A pin to convert the contact state, (g) substantially equal shape within the plane shape of the switch housing portion
The spring receiving plate composed of a plate-shaped body, and (h) is provided so as to surround the outer periphery of the pin, one end of which is the pin.
It is inserted into the receiving hole and the one end of the pin is inserted into the pin.
Pressure contact with the bottom surface of the through hole, and the other end on the top surface of the spring receiving plate .
It is fixed and gives the above push button a restoring force for pressing operation
In addition, it is a coil that applies downward pressure contact force to the spring receiving plate.
A push button switch characterized by comprising a spring . 5. The push button switch according to claim 4, wherein an arcuate projecting piece is formed at the center of the lower surface of the spring receiving plate and slides on the engaging projecting portion of the movable contact piece support. 6. The push button according to claim 2, wherein the pair of the leg portions of the spring receiving plate have side protrusions, which are elastically in contact with the inner wall surface of the switch accommodating portion, on the outer sides of their lower end portions. switch. 7. The push button extends downward from both ends of its lower surface, and a pair of legs having engaging projections at its lower end are integrally formed, and the push button is inserted into a through engaging hole formed in the spring receiving plate. The push button switch according to claim 2, which is engaged. 8. The movable contact piece is constituted by an elastic metal plate having two elongated contact piece portions facing each other with a space therebetween and connected to each other at an intermediate portion, and both ends of the movable contact piece. 2. The push button switch according to claim 1, wherein one of the first and second fixed contact pieces is elastically sandwiched between the facing contact piece portions in the section. 9. The push button switch according to claim 8, wherein an intermediate portion of the movable contact piece is mounted and held in a housing groove formed on a lower surface of the movable contact piece support. 10. A bearing portion is formed so as to project to the center of each of both side edges of the bottom plate, and the movable contact piece support is supported by the bearing portion so as to be capable of seesaw movement.
The push button switch according to claim 1, wherein the common contact piece is supported by the bottom plate in parallel with the bearing portion, and the central portion of the movable contact piece is constantly elastically contacted with the common contact piece.