JP4299165B2 - Push button switch - Google Patents

Description

  The present invention relates to a pushbutton switch, and more particularly to a pushbutton switch that includes a pair of pushbuttons and that locks the other pushbutton so that the other pushbutton cannot be pushed by a push operation of one pushbutton.

  As a prior art of this type of push button switch, a push button switch using a seesaw type stop plate disclosed in Japanese Patent No. 2668601 is known.

  The principle of the pushbutton switch using the seesaw type stop plate will be described in detail. As shown in FIG. 17 (1), a seesaw type stop plate 101 is disposed between a pair of push buttons 100A and 100B. For example, when the push button 100B is pushed in, as shown in FIG. 17 (2), the stop plate 101 rotates in the direction of the arrow around the axis, and the push button 100A is locked so that the push operation cannot be performed. Conversely, when the push button 100A is pushed in, the stop plate 101 rotates about the axis in the direction opposite to the arrow direction, and the push button 100B is locked so that the push operation cannot be performed. In this way, the pushbutton switch using the seesaw-type stop plate is locked so that the seesaw-type stop plate can be rotated by pressing one of the pushbuttons and the other pushbutton cannot be pressed. It is comprised so that.

Japanese Patent No. 2668601

However, the push button switch described in Patent Document 1 has the following problems.
(1) With a seesaw-type stop plate, there is no contact surface with the body on the lower side where the stop plate is raised, so the pressing force received from the push button is applied to the fulcrum of the stop plate. The plate may be damaged.

  (2) In addition, the seesaw type stop plate requires a clearance of about half of the button full stroke between the push button and the stop plate. As shown in FIG. When you press simultaneously, you can press the button halfway. In that case, the NC contact that is immediately cut off operates before the lock is activated.

  The present invention has been devised in view of the above circumstances, and its purpose is to prevent breakage of the stop plate due to the push-button pressing operation and to allow clearance between the push button and the stop plate. In other words, a push button switch is provided which is made small so that both push buttons cannot be pushed in at the same time to prevent malfunction of contact opening and closing.

  In order to achieve the above object, the invention according to claim 1 of the present invention is such that two push buttons, the first push button and the second push button, are incorporated in the casing, and each push button includes an operation piece for performing a push operation. And an operating shaft for opening and closing the contacts, and a push-button that locks the other push button so that it cannot be pushed by pushing one of the first and second push buttons. In the button switch, the first protrusion and the second protrusion, which are juxtaposed on the operation piece back surfaces of the first and second push buttons, respectively, and the positions of the first protrusion and the second protrusion on the second push button are arranged. The first and second protrusions are disposed at positions where the operation pieces of the first push button are rotated by 180 degrees around the central axis thereof, and the first protrusion and the second protrusion, 1 and 2 pushbuttons A first stop plate disposed behind the operation piece and extending across the first push button and the second push button, wherein the first through hole is associated with the first protrusion of the first push button. And a second through hole related to the second protrusion of the second push button, supported by the bottom surface of the casing, and movable in a direction orthogonal to the push button pushing direction, A second stop plate disposed behind the operation pieces of the first and second push buttons and extending between the first push button and the second push button; A second through hole related to the protrusion and a first through hole related to the first protrusion of the second push button are supported on the bottom surface of the casing and moved in a direction orthogonal to the push direction of the push button. A free second stopper plate and the first stopper plate on the second push button side along the orthogonal direction. And a second urging means for urging the second stop plate from the first push button side toward the second push button side along the orthogonal direction. And a biasing means, wherein the first protrusion has a blocking surface that abuts against the surface of the stopper plate to prevent insertion of the first through hole, and the second protrusion is formed on the peripheral edge of the second through hole of the stopper plate. When the first push button is pushed in, the inclined surface of the second protrusion provided on the first push button hits the peripheral edge of the second through hole of the second stop plate. In contact therewith, against the urging force of the second urging means, the blocking surface of the first protrusion provided on the second push button comes into contact with the surface of the second stopper plate, and the first protrusion projects into the first through hole. When the second stopper plate is moved to the position where the insertion is blocked to prevent the second push button from being pushed, and the second push button is pushed, The inclined surface of the second protrusion provided in the push button is in contact with the peripheral edge of the second through hole of the first stopper plate, and the first push button is provided in the second push button against the urging force of the first urging means. The first blocking plate is moved to a position where the blocking surface of the protrusion abuts against the surface of the first locking plate to prevent the insertion of the first protrusion into the first through hole, and the first push button is prevented from being pushed in. It is characterized by doing.

  As described above, since both the first stopper plate and the second stopper plate are supported on the bottom surface of the casing, it is possible to prevent the stopper plate from being damaged due to the pressing operation of the push button. In addition, since the clearance between the push button and the stop plate is made as small as possible, it is not possible to push in both push buttons at the same time, and as a result, it is possible to prevent a malfunction of the contact opening / closing.

  The invention according to claim 2 is the push button switch according to claim 1, wherein the first protrusion is fitted into the first through hole at the tip of the first protrusion when the push button is not pushed. The guide part which guides insertion to the 1st through-hole of this is formed.

  With the above configuration, the push button can be pushed in smoothly.

  The invention according to claim 3 is the pushbutton switch according to claim 1 or 2, wherein the blocking surface of the first protrusion of the first pushbutton is directed toward the biasing direction of the first biasing means. The first stop plate surface area with which the blocking surface abuts is an inclined surface corresponding to the inclination of the blocking surface, and the blocking surface of the first protrusion of the second push button is The second stop plate surface area in contact with the blocking surface is an inclined surface corresponding to the inclination of the blocking surface while being inclined toward the urging direction of the second urging means. It is characterized by.

  With the above configuration, the first push button and the second push button can be locked smoothly, and the locked state can be made complete.

  The invention according to claim 4 is the push button switch according to any one of claims 1 to 3, wherein the inclined surface of the second protrusion is inclined more than the first inclined surface and the first inclined surface. The second inclined surface having a large diameter is formed in this order from the distal end to the proximal end side.

  With the above configuration, it is possible to increase the moving distance of the stopper plate in the initial stage of the push button pushing operation, and to reduce the pushing force of the push button in the subsequent stage, thereby achieving a smooth push operation. .

  According to the present invention, it is possible to prevent damage to the stopper plate due to the pushing operation of the push button and to make the clearance between the push button and the retaining plate as small as possible so that both the push buttons cannot be pushed simultaneously. In this way, it is possible to prevent malfunctions of contact opening / closing.

  Hereinafter, a pushbutton switch according to the present invention will be described in detail based on embodiments. Note that the present invention is not limited to the following embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing the overall configuration of the pushbutton switch according to the first embodiment. The push button switch 1 includes an operation unit 3 having two push buttons, a first push button 2A and a second push button 2B, a contact unit 7 having an NC contact 4, a lead plate 5, an electrode terminal 6, and the like, It is comprised from the connection part 8 which connects the operation part 3 and the contact part 7. FIG. The NC contact 4, lead plate 5, and electrode terminal 6 are related to the first push button 2A, and the NC contact, lead plate, and electrode terminal related to the second push button 2B are not shown in the figure. 1 on the near side. The components of the pushbutton switch are basically made of synthetic resin except for springs, contacts, terminals, and the like.

  2 is a cross-sectional view showing the configuration of the operation unit of the pushbutton switch, FIG. 3 is a front view of the operation unit, FIG. 4 is an internal front view of the operation unit, and FIG. 5 is an arrow A in FIG. -A sectional view, FIG. 6 is an exploded perspective view of the operating portion, FIG. 7 is a perspective view of the operating piece of the push button as viewed from the rear side, and FIG. 8 is a sectional view taken along the line BB in FIG. FIG. 9 is a cross-sectional view taken along the line CC in FIG. 4 is drawn with the buttons and the lens of the operation unit omitted, and FIG. 8A is a cross-sectional view in a state where neither of the push buttons 2A and 2B is pushed, and FIG. 2) is a cross-sectional view of the push button 2A being pushed in. 9 (1) to 9 (6) are cross-sectional views at each stage from the state where the push button 2A is not pushed in to the state where the pushing is completed. Push buttons 2A, 2B and a lens 11 are incorporated on the front side of the casing 10 of the operation unit 3, and a longitudinal first stop plate 12 and the push buttons 2A, 2B and the lens 11 on the back side. A second stop plate 13 (see FIGS. 4 and 6) is disposed. The lens 11 is disposed between the first push button 2A and the second push button 2B, and a light emitter 14 such as an LED is disposed behind the lens 11 (right side in FIG. 2) (see FIG. 1). The light from the light emitter 14 is guided to the surface side through the lens 11. When the light emitter 14 is not used, the lens 11 uses an opaque cover.

  As shown in FIG. 6, the first push button 2 </ b> A has a flat operation piece 15 a and an operation shaft 16 a extending from the lower center portion of the operation piece 15 a to the rear side (right side in FIG. 2). The first protrusion 20A and the second protrusion 21A having different shapes are juxtaposed in the left-right direction on the back surface of the operation piece 15a. The operation shaft 16a is slidably inserted into a shaft hole 10b formed in the casing bottom surface 10a, and a contact opening / closing operation is performed at a tip portion thereof. A return coil spring 22a of the first push button 2A is interposed between the operation piece 15a and the casing bottom surface 10a.

  Similarly to the first push button 2A, the second push button 2B also extends to the rear side (right side in FIG. 2) from the upper central portion of the flat operation piece 15b and the operation piece 15b, as shown in FIG. And a return coil spring 22b of the second push button 2B is interposed between the operation piece 15b and the casing bottom surface 10a. Further, the first protrusion 20B and the second protrusion 20B are provided on the back surface of the operation piece 15b. The protrusions 21B are juxtaposed in the left-right direction. However, the arrangement of the first protrusion and the second protrusion is reversed between the first push button 2A and the second push button 2B. That is, the first push button 2A and the second push button 2B are arranged in the casing in a state in which one push button is rotated 180 degrees around the center axis of the other push button. When the first push button 2A is viewed from the front side, the first protrusion 20A is formed on the left side and the second protrusion 21A is formed on the right side, while when the second push button 2B is viewed from the front side. A second protrusion 21B is formed on the left side and a first protrusion 20B is formed on the right side. The first protrusion 20A of the first push button 2A and the second protrusion 21B of the second push button 2B are arranged to face each other. The second protrusion 21A of 2A and the first protrusion 20B of the second push button 2B are arranged to face each other.

  As shown in FIGS. 8 and 9, the first protrusions 20 </ b> A and 20 </ b> B are formed in a stepped shape having guide portions 23 a and 23 b at the tips. The step surfaces of the first protrusions 20A and 20B constitute blocking surfaces 26a and 26b that come into contact with the surfaces of the stop plates 12 and 13 and prevent the insertion of the first through holes 32A and 32B. The blocking surfaces 26a and 26b are inclined surfaces as clearly shown in FIGS.

  On the other hand, as shown in FIGS. 8 and 9, the second protrusions 21A and 21B are inclined surfaces 27a and 27b that function as cam surfaces that contact the edges of the second through holes 33A and 33B and move the stopper plate. have. The inclined surface 27a is formed on the upper end surface of the second protrusion 21A, and includes a first inclined surface 28a and a second inclined surface 29a having different inclination angles from the distal end portion toward the proximal end portion. On the other hand, the inclined surface 27b is formed on the lower end surface of the second protrusion 21B, and includes a first inclined surface 28b and a second inclined surface 29b having different inclination angles from the distal end portion toward the proximal end portion. The first inclined surfaces 28a and 28b have an inclination angle of, for example, about 35 degrees, and the second inclined surfaces 29a and 29b have an inclination angle larger than that of the first inclined surfaces 28a and 28b. In this way, by providing two inclined surfaces with different inclination angles, the movement distance of the stop plate acts greatly at the initial stage of the push button pushing operation described later, and the push button pushing force is reduced at the subsequent stage. Therefore, a smooth pushing operation can be achieved.

  The first stop plate 12 and the second stop plate 13 are arranged in parallel to each other, are supported by the bottom surface 10a of the casing, and are within a plane substantially perpendicular to the pressing direction of the push button and of the first push button. The first protrusion 20A and the second protrusion 21B of the second push button are movable along a straight line connecting the second protrusion 21B. The first stop plate 12 is urged in the arrow direction N1 by the coil spring 30, and the second stop plate 13 is urged in the arrow direction N2 by the coil spring 31. A first through hole 32A related to the first protrusion 20A is formed on the upper end side of the first stop plate 12, and a second hole related to the second protrusion 21B is formed on the lower end side of the first stop plate 12. A through hole 33B is formed. On the other hand, a second through hole 33A related to the second protrusion 21A of the first push button 2A is formed on the upper end portion side of the second stop plate 13, and a second through hole 33A is formed on the lower end portion side of the second stop plate 13. A first through hole 32B related to the first protrusion 20B of the push button 2B is formed.

The guide portions 23a and 23b of the first protrusions 20A and 20B are fitted in the first through holes 32A and 32B when not pushed, and when the push button is pressed, the first protrusions 20A and 20B are It serves to guide the through holes 32A and 32B. Thereby, pushing operation of a pushbutton can be performed smoothly.
The first stop plate 12 surface area 35 (see FIG. 8) with which the blocking surface 26a of the first protrusion 20A abuts is an inclined surface corresponding to the inclination of the blocking surface 26a, and the blocking of the first protrusion 20B. The surface area 36 (see FIG. 9) of the second stopper plate 13 with which the surface 26b abuts is an inclined surface corresponding to the inclination of the blocking surface 26b. With such a configuration, the push-button pressing operation can be completely locked.

(Push button switch operation)
Next, the operation of the push button switch configured as described above will be described.
(1) When only the push button 2A is pushed In the state where neither of the push buttons 2A and 2B is pushed, as shown in FIGS. 8 (1) and 9 (1), each of the push buttons 2A and 2B The first protrusions 20A and 20B can be inserted into the first through holes 32A and 32B of the first and second stopper plates, respectively. When the first push button 2A is pushed in such a state, the first protrusion 20A is inserted into the first through hole 32A. At this time, in the second protrusion 21 </ b> A of the first push button 2 </ b> A, the first inclined surface 28 a comes into contact with the peripheral edge portion of the second through hole 33 </ b> A of the second stopper plate 13, and the second stopper plate 13 is moved to the spring of the spring 31. It is moved upward against the force (see FIGS. 9 (2) to (4)).

  Next, the second inclined surface 29 a comes into contact with the peripheral edge of the second through hole 33 </ b> A of the second stop plate, and moves the second stop plate 13 upward against the spring force of the spring 31. When the vicinity of the rear end of the second inclined surface 29a reaches a position where it comes into contact with the peripheral edge of the second through-hole 33A (see FIG. 9 (5)), the blocking surface 26b of the first protrusion 20B of the second push button becomes the first. The second stopper plate 13 comes out of the first through hole 32b and comes into contact with the surface region 36 of the second stopper plate 13 (see FIG. 9 (6)). That is, the second stopper plate 13 has been moved to a position that prevents the first protrusion 20B from being inserted into the first through hole 32B. Thereby, pushing of the 2nd pushbutton 2B will be in a locked state. At this time, since the back surface of the second stopper plate 13 is in contact with the casing bottom surface 10a, the pressing force of the second push button 2B is received by the casing bottom surface 10a, and the stopper plate is damaged as in the conventional example. This can be prevented.

(2) When only the push button 2B is pushed When both the push buttons 2A and 2B are not pushed and only the second push button 2B is pushed, the first protrusion 20B is formed in the first through hole 32B. It will be inserted into. At this time, in the second protrusion 21 </ b> B of the second push button, the first inclined surface 28 b comes into contact with the peripheral edge portion of the second through hole 33 </ b> B of the first stop plate 12, and the first stop plate 12 is made to have a spring force of the spring 30. Move it down against

  Next, the second inclined surface 29 b comes into contact with the peripheral edge portion of the second through hole 33 </ b> B of the first stopper plate 12, and moves the first stopper plate 12 downward against the spring force of the spring 30. When the vicinity of the rear end of the second inclined surface 29b reaches a position where it abuts on the peripheral edge of the second through hole 33B, the blocking surface 26a of the first protrusion 20A of the first push button causes the first penetration of the first stopper plate 12 It will come off from the hole 32A and will be in the state which contacts the surface area | region 35 of the 1st stopper plate 12. FIG. That is, the first stopper plate 12 has been moved to a position that prevents the first protrusion 20A from being inserted into the first through hole 32A. Thereby, pushing of the 1st pushbutton is made into a locked state. At this time, since the back surface of the first stopper plate 12 is in contact with the casing bottom surface 10a, the pressing force of the first push button is received by the casing bottom surface 10a, and the stopper plate is damaged as in the conventional example. Can be prevented.

(3) When both push buttons 2A and 2B are pushed in at the same time When both push buttons 2A and 2B are pushed in at the same time, the push button 2A is pushed and the state shown in FIG. 11 (1) to FIG. Thus, the blocking surface 26b of the first protrusion 20B comes into contact with the second stopper plate 13. On the other hand, when the push button 2B is pushed, the state immediately changes from the state shown in FIG. 10 (1) to the state shown in FIG. 10 (2), and the blocking surface 26a of the first protrusion 20A comes into contact with the first stop plate 12. Thus, since both push buttons 2A and 2B hit the stop plates 12 and 13 with a slight stroke of the push button, both cannot be pushed in. Accordingly, it is possible to prevent a malfunction that the NC contact opens due to being able to push in about half the stroke of the push button as in the conventional example.

(Embodiment 2)
12 is an internal front view of the operation part of the pushbutton switch according to the second embodiment, FIG. 13 is a sectional view taken along the line DD of FIG. 12, and FIG. 14 is an internal front view of the operation part when the pushbutton is locked. FIG. 15 is an internal front view of the operation unit when the push button lock is released. 13 (1) is a cross-sectional view when the push button is not operated, and FIG. 13 (2) is a cross-sectional view when the push button is locked, and FIG. 13 (3) is a push-button. It is sectional drawing at the time of lock release in which the lock of the button was cancelled | released. The pushbutton switch according to the second embodiment is a self-holding type switch. When one pushbutton is pushed, the pushbutton switch is held, and the other pushbutton is pushed to release the push-holding state. There is a need. This self-holding type switch is used, for example, as a push button switch having two push buttons for starting and stopping operation.

  The second embodiment is similar to the first embodiment, and corresponding portions are denoted by the same reference numerals and detailed description thereof is omitted. In the second embodiment, one stop plate 40 is used instead of the two stop plates 12 and 13 used in the first embodiment. As shown in FIG. 13, a step surface 41 is formed on the lower inner surface of the first through hole 32A of the stop plate 40, and the step surface 41 is formed on the engagement surface 42 of the first protrusion 20A when locked. It is designed to be locked.

  Next, the operation of the push button switch according to Embodiment 2 will be described. First, when the push button 2A is not operated, the guide portion 23a of the first protrusion 20A is fitted in the first through hole 32A as shown in FIG. 13 (1). In such a state, when the push button 2A is pushed in and the guide portion 23a of the first protrusion 20A exceeds the lower edge surface 43 of the first through hole 32A, as shown in FIG. Due to the spring force of the spring 30, the step surface 41 is locked to the locking surface 42 of the first protrusion 20 </ b> A. As a result, the push button 2A is locked.

  When the push button 2A is unlocked, when the push button 2B is pushed in, the inclined surface 27b of the second protrusion 21B comes into contact with the lower edge of the second through hole 33B as shown in FIG. The stop plate 40 moves downward against the spring force of the spring 30 by the inclined surface 27b of 21B. Thereby, the lock of the push button 2A is released, and the push button 2A is returned to the original state by the return spring 22a.

  Thus, in the second embodiment, a self-holding type push button switch can be easily realized by using the stop plate 40 instead of the stop plates 11 and 12.

(Embodiment 3)
FIG. 16 is a cross-sectional view of the pushbutton switch according to the third embodiment. The third embodiment is a self-holding pushbutton switch similar to the second embodiment. However, in the third embodiment, when either one of the push buttons 2A and 2B is held by itself, the lock is released by pushing the other push button. Different from Form 2. With reference to FIG. 16, the structure of the pushbutton switch of this Embodiment 3 is demonstrated. This push button switch basically uses two retaining plates 12 and 13 as in the push button switch of the first embodiment. However, a step surface 41 similar to that of the second embodiment is formed in the first through holes 32A and 32B of the stop plates 12 and 13.

  Next, the operation of the push button switch configured as described above will be described. When the first push button 2A is pushed in, as shown in FIG. 16 (1), the first protrusion 20A is fitted into the first through hole 32A, and the first push button 2A is locked. Next, when the second push button 2B is pushed in, as shown in FIG. 16 (2), the inclined surface 27b of the second protrusion 21B comes into contact with the lower edge portion of the second through-hole 33B to move the first stopper plate 12. The first push button 2A is unlocked.

  Then, when the first push button 2A is returned to the original state by the return spring 22a, as shown in FIG. 16 (3), the second protrusion 21A is in a state in which the tip thereof is in contact with the second through hole 33A. Therefore, the stop plate 13 is moved downward by the spring force of the spring 31, the first protrusion 20B is fitted into the first through hole 32B, and the second push button 2B is locked.

  Thus, when one of the push buttons 2A and 2B is held by itself, the lock can be released by pushing the other push button.

(Other matters)
In the embodiment described above, the blocking surfaces 26a and 26b of the first protrusion are inclined surfaces, and the stop plate surface regions 35 and 36 with which the blocking surfaces 26a and 26b abut are inclined surfaces corresponding to the inclination of the blocking surface. However, the blocking surfaces 26a and 26b may be flat surfaces, and the surface regions 35 and 36 of the stop plate may be flat surfaces correspondingly.

  In the above embodiment, the first protrusion guide portions 23a and 23b are provided to smoothly insert the first protrusions 20A and 20B into the first through holes 32A and 32B. Even if 23a and 23b are not provided, the effects of the present invention can be sufficiently achieved.

  Furthermore, in the above-described embodiment, the inclined surfaces 27a and 27b of the second protrusions are constituted by the first inclined surfaces 28a and 28b and the second inclined surfaces 29a and 29b, but may be constituted by one inclined surface. The effect of the present invention can be sufficiently achieved.

  The present invention can be applied to a pushbutton switch.

It is sectional drawing which shows the whole structure of the pushbutton switch which concerns on this Embodiment 1. FIG. It is sectional drawing which shows the structure of the operation part of the pushbutton switch which concerns on this Embodiment 1. FIG. FIG. 3 is a front view of an operation unit according to the first embodiment. FIG. 3 is an internal front view of an operation unit according to the first embodiment. It is arrow AA sectional drawing of FIG. FIG. 3 is an exploded perspective view of an operation unit according to the first embodiment. It is the perspective view which looked at the operation piece of the pushbutton from the back side. It is arrow BB sectional drawing of FIG. FIG. 4 is a cross-sectional view taken along the line CC in FIG. 3. FIG. 4 is a cross-sectional view taken along the line BB in FIG. 3 when both of the push buttons 2A and 2B are pushed in simultaneously. FIG. 4 is a cross-sectional view taken along the line CC in FIG. 3 when both of the push buttons 2A and 2B are pushed in simultaneously. FIG. 10 is an internal front view of an operation unit according to the second embodiment. It is arrow DD sectional drawing of FIG. It is an internal front view at the time of locking of the pushbutton of the operation part which concerns on this Embodiment 2. FIG. It is an internal front view at the time of lock release of the pushbutton of the operation part which concerns on this Embodiment 2. FIG. FIG. 10 is a cross-sectional view of an operation unit according to the third embodiment. It is a figure for demonstrating the principle of a prior art example.

Explanation of symbols

1: Push button switch 2A: First push button 2B: Second push button 10: Casing 10a: Bottom surface of casing 12: First stop plate 13: Second stop plate 20A, 20B: First protrusion
21A, 21B: second protrusions 23a, 23b: guide portions 26a, 26b: blocking surfaces 27a, 27b: inclined surfaces 28a, 28b: first inclined surfaces 29a, 29b: second inclined surfaces 30, 31: springs 32A, 32B: First through hole 33A, 33B: second through hole
35, 36: Surface area of the stop plate abutting against the blocking surface

Claims (4)

Two push buttons, a first push button and a second push button, are incorporated in the casing, and each push button includes an operation piece for performing a push operation and an operation shaft for performing a contact opening / closing operation. In the pushbutton switch that locks the pushbutton so that the pushbutton cannot be pushed by pushing one of the pushbuttons.
A first projection and a second projection arranged in parallel on the back of the operation piece of each of the first and second push buttons, wherein the positions of the first projection and the second projection on the second push button Such first protrusion and second protrusion, which are the arrangement positions of the first protrusion and the second protrusion in a state in which the operation piece of the button is rotated by 180 degrees around the central axis;
A first stop plate disposed behind the operation pieces of the first and second push buttons and extending between the first push button and the second push button; A first through hole related to the protrusion and a second through hole related to the second protrusion of the second push button are supported on the bottom surface of the casing and moved in a direction orthogonal to the push direction of the push button. A free first stop plate;
A second stop plate disposed behind the operation pieces of the first and second push buttons and extending between the first push button and the second push button; A second through hole related to the protrusion and a first through hole related to the first protrusion of the second push button are supported on the bottom surface of the casing and moved in a direction orthogonal to the push direction of the push button. A free second stop plate,
First urging means for urging the first stop plate from the second push button side toward the first push button side along the orthogonal direction;
Second urging means for urging the second stopper plate from the first push button side toward the second push button side along the orthogonal direction;
With
The first protrusion has a blocking surface that abuts against the surface of the stopper plate to prevent the insertion of the first through hole, and the second protrusion contacts the peripheral edge of the second through hole of the stopper plate to move the stopper plate. Has a surface,
When the first push button is pushed in, the inclined surface of the second protrusion provided on the first push button comes into contact with the peripheral edge of the second through hole of the second stopper plate and resists the biasing force of the second biasing means. Then, the second stopper plate is moved to a position where the blocking surface of the first protrusion provided on the second push button comes into contact with the surface of the second stopper plate and prevents the insertion of the first protrusion into the first through hole. , Blocking the push of the second push button,
When the second push button is pushed in, the inclined surface of the second protrusion provided on the second push button comes into contact with the peripheral edge of the second through hole of the first stopper plate and resists the biasing force of the first biasing means. Then, the first stopper plate is moved to a position where the blocking surface of the first protrusion provided on the second push button abuts the surface of the first stopper plate and prevents the insertion of the first protrusion into the first through hole. A push button switch characterized in that the push of the first push button is blocked.   The leading end of the first protrusion is formed with a guide portion that fits into the first through hole and guides the insertion of the first protrusion into the first through hole when the push button is not pushed. The pushbutton switch according to 1. The blocking surface of the first protrusion of the first push button is inclined toward the urging direction of the first urging means, and the first stop plate surface area with which the blocking surface abuts is the blocking surface. It is an inclined surface corresponding to the inclination of the surface,
The blocking surface of the first protrusion of the second push button is inclined toward the urging direction of the second urging means, and the second stop plate surface area with which the blocking surface abuts is the blocking surface. The pushbutton switch according to claim 1, wherein the pushbutton switch has an inclined surface corresponding to the inclination of the surface.   The inclined surface of the second protrusion is formed with a first inclined surface and a second inclined surface having a larger inclination angle than the first inclined surface in this order from the distal end toward the proximal end side. The pushbutton switch according to any one of 1 to 3.