JP2001035300A - Push-button switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize switching operation. SOLUTION: A push-button switch is provided with a hollow push button 2, a case 3 for supporting it, a (first) contact 41 disposed in the case 3, and a switching mechanism 6 having a (second) contact 51 disposed so as to face the contact 41 while one end of which is inserted in the hole 2a of the push button 2. A slide block 8 slidable perpendicularly slidable in the pushing direction of the push button 2 is provided in a hole 61a formed in the insertion part 61 of the switching mechanism 6. An inclined surface 8a, which can be engaged with the inclined surface 2b of the hole 2a of the push button 2, is formed on the slide block 8. A coil spring (return spring) 12 to energize the shaft part 62 of the switching mechanism 6 to the push button 2 side is provided on the bottom part 31 of a case 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch, and more particularly, to an ON state from an initial first OFF state and further to a second OFF state as the push amount of the push button increases. Push button switch.

[0002]

2. Description of the Related Art For example, N
When performing a manual operation on a C-controlled machine, an operator often enters a danger zone and performs work. In such a case, in order to avoid an accident during the work due to contact with the machine. A pendant provided with a push button switch called an enable switch (or a deadman switch) is used.

[0003] The pendant is a portable unit capable of teaching a program to a robot or operating the robot by being connected to a control device. As shown in FIG.
Has an input keyboard 120 arranged on the main surface side, and a push button switch (enable switch) 100 arranged on one side surface. Push button switch 1
00 may be arranged on the back side of the pendant 110 in some cases. The pendant 110 has a signal cable 130 connected to a control device (not shown).

A conventional push button switch 100 is shown in FIG.
As shown in FIG. 1, the electronic device includes a push button 101 and a micro switch 102 disposed opposite to the push button 101. Push button 1
The lower surface of the micro switch 01 is provided with a leaf spring 103 extending downward, and the upper surface of the micro switch 102 is provided with a pressing plate 104 having a spring property and an actuator 105. A bent portion 103 is provided at the tip of the leaf spring 103.
a is formed.

When using the push button switch 100, first, a pendant 110 (FIG. 23) incorporating the push button switch 100 is connected to a control panel of a machine to be manually operated via a signal cable 130. . At this time, if the push button switch 100 is in the OFF state, no key is input even if the keyboard 120 of the pendant 110 is operated.

Next, the push button 101 is depressed. Then, as shown in FIG. 21, the bent portion 103a of the leaf spring 103 that moves together with the push button 101 engages with the pressing plate 104 of the microswitch 102, and the pressing plate 1
04 elastically deforms downward and presses the actuator 105. Then, the actuator 105 moves downward, and the contact point inscribed in the micro switch 102 comes into contact, whereby the micro switch 102 is turned on.

[0007] The operator presses down the push button 101 so as to maintain the ON state, while holding the pendant 110.
Key input from the keyboard 120 of the user. At this time, when the operator releases the finger from the push button 101 when the user feels a danger of contact with the movable part of the manually operated machine, the push button 101 returns to the state shown in FIG.
02 turns off and the machine stops.

When the operator feels danger and panics and pushes the push button 101 further, as shown in FIG. 22, the bent portion 103a of the leaf spring 103 is The engagement with the plate 104 is released, and the pressing plate 104 returns to its original position by its restoring force. As a result, the micro switch 102 is turned off, and the machine stops.

As described above, in the push button switch 100, only when the micro switch 102 is in the ON state,
Since the key input from the keyboard 120 of the pendant 110 becomes possible and the manual operation can be performed, the intention of the operator at the time of the manual operation can be clarified, and the safety of the operator can be ensured.

However, in the conventional pushbutton switch, the ON state is maintained by the engagement of the leaf springs, and the OFF state is established by the amount of elastic deformation of each leaf spring being increased and the engagement of the leaf springs being released. , The timing of the transition from the ON state to the OFF state largely depends on the accuracy of each leaf spring.

Therefore, depending on the variation of the leaf spring,
The transition from the ON state to the OFF state immediately or not easily results in unstable operation, and the switching accuracy is not very high.

The present invention has been made in view of such conventional circumstances, and has as its first object to provide a push button switch capable of stabilizing the operation. A second object of the present invention is to allow the contacts to be forcibly opened and transitioned to the OFF state even when the contacts are welded, whereby the operation can be further stabilized. It is to provide a button switch.

[0013]

According to a first aspect of the present invention, there is provided a push-button switch, which changes from an initial first OFF state to an ON state, and further to a second OFF state, as the push amount of the push button increases. A push button switch that moves, comprising a hollow push button, a case supporting the push button, a first contact provided in the case, and one end inserted into the hollow interior of the push button, and A switching mechanism having an end extending into the case and having a second contact arranged at a position facing the first contact, wherein one end of the switching mechanism intersects a pressing direction of the push button. The slide block is provided so as to be slidable in the direction in which the push button is formed, and the slide block is formed with an inclined surface that can engage with an inclined surface formed inside the hollow of the push button. , The said case is characterized by a return spring for urging the other end of the switching mechanism to the push button side.

According to a second aspect of the present invention, there is provided a push button switch according to the first aspect of the present invention, wherein an initial first button is increased as the push amount of the push button increases.
From the OFF state to the ON state, and the second OFF state
A pushbutton switch that shifts to a state, wherein the pushbutton switch is a hollow pushbutton, a case that supports the pushbutton, a first contact provided in the case, and a lower end of the pushbutton can contact, A switching mechanism inserted into the hollow interior of the push button, the other end of which extends into the case, and has a second contact arranged at a position facing the first contact; In
A slide block is provided so as to be slidable in a direction intersecting with the pushing direction of the push button, and the slide block is formed with an inclined surface capable of engaging with an inclined surface formed inside the hollow of the push button. The case has a return spring for urging the other end of the switching mechanism toward the push button, and the lower end of the push button pushes down the first contact point in the second OFF state. It is characterized by that.

According to the first aspect of the present invention, the initial first O
In the FF state, the inclined surface of the slide block is engaged with the inclined surface inside the hollow of the push button. When the push button is pushed in from this state, the switching mechanism moves with the push button via the slide block, and the slide mechanism is moved. Is in contact with the first contact on the case side to be turned on.

When the push button is further depressed from the ON state, the other end of the switching mechanism contacts the bottom of the case,
When the push button is further pushed in from this state, the pressing force acting on the inclined surface of the slide block increases from the inclined surface inside the hollow of the push button, and the slide block slides due to this pressing force. As a result, the engagement between the inclined surface inside the hollow of the push button and the inclined surface of the slide block is released.

On the other hand, at this time, the return spring in the case is contracted, and the biasing force of the return spring acts on the other end of the switching mechanism. Therefore, when the hollow inside of the push button is disengaged from the slide block, the other end of the switching mechanism moves to the push button side by the biasing force of the return spring. As a result, the second contact that moves together with the switching mechanism separates from the first contact and enters the second OFF state.

As described above, according to the first aspect of the present invention, when the inclined surface of the slide block is disengaged from the inclined surface inside the hollow of the push button, the ON state is shifted to the second OFF state. From the ON state
The transition to the OFF state is performed stably, whereby
Operation can be stabilized.

According to the second aspect of the present invention, the initial first OFF state is set.
The transition operation from the state to the ON state is the same as that of the first aspect. When shifting from the ON state to the second OFF state, if the push button is further pressed from the ON state,
Similarly to the first aspect of the present invention, the pressing force acting on the inclined surface of the slide block increases from the inclined surface inside the hollow of the push button, the slide block slides, and the engagement of each inclined surface is released. Then, by the biasing force of the return spring acting on the other end of the switching mechanism, the switching mechanism moves to the push button side, the second contact is separated from the first contact, and the second contact is separated.
In the OFF state.

In the second OFF state,
The lower end of the push button is in contact with the first contact to push down the first contact, and the first contact is forcibly separated from the second contact.

According to the second aspect of the present invention, the second
In the OFF state, not only the second contact is separated from the first contact by the movement of the switching mechanism to the push button side, but also the lower end of the push button pushes down the first contact, so that the first contact becomes the first contact. 2 are separated from the contact point. That is, even if the first contact and the second contact are welded, each contact is forcibly opened. Thereby, the transition from the ON state to the second OFF state is reliably performed, and the operation can be further stabilized.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS < First Embodiment > An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic longitudinal sectional view of a push button switch according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIGS. Fig. 9
FIG. 3 is a schematic diagram showing a relationship between an operation load and an operation stroke of a push button.

As shown in FIG. 1, a push button switch 1
Includes a hollow push button 2, a case 3 supporting the push button 2, a fixed terminal 4 fixed to a bottom 31 of the case 3,
A switching mechanism 6 having a movable terminal 5 disposed above the fixed terminal 4.

The push button 2 has a hole 2a and an inclined surface 2b.
Are formed. A plurality of support shafts 21 projecting downward are provided below the push button 2, and the coil spring 7 is mounted around each support shaft 21.
The upper end of each coil spring 7 is the lower surface 2c of the push button 2.
The lower end is pressed against the bottom surface 31a of the bottom 31. The push button 2 is constantly urged upward by the spring force of the coil spring 7.

The fixed terminal 4 is a substantially T-shaped member in a plan view, which is bent in a substantially U shape in the case 3 (see FIG. 2). (Springiness). At the tip of the bent portion 4a,
A (first) contact 41 is provided.

The upper part of the switching mechanism 6 has a push button 2
The insertion portion 61 is formed with a pair of left and right holes 61a extending in the left-right direction that intersects the pushing direction of the push button 2.

The slide block 8 is slidably inserted into the hole 61a. The slide block 8 has an inclined surface 8a that can be engaged with the inclined surface 2b of the hole 2a of the push button 2. Further, a coil spring 9 for urging the slide block 8 in a direction protruding from the hole 61a is inserted into the hole 61a.

A shaft 62 extending downward is provided below the switching mechanism 6. The movable terminal 5 includes a shaft 6
2 is slidably supported in the vertical direction. The movable terminal 5 is provided with a (second) contact 51. The spring force of the coil spring 10 acts on the upper part of the movable terminal 5. The coil spring 10 has a movable terminal 5
This is to secure a contact pressure when the contact 51 of the fixed terminal 4 comes into contact with the contact 41 of the fixed terminal 4.

The lower part of the shaft part 62 is inserted into a hole 31b formed in the bottom part 31 of the case 3. A coil spring (return spring) 12 is mounted in the hole 31b.
Is constantly biased upward. In the hole 31b, a stopper surface 31c with which the stepped portion 62a of the shaft portion 62 can abut is formed.

A plurality of projections 22 projecting downward are provided below the push button 2. Each projection 22
Are arranged on both sides of the movable terminal 51 at a position facing the fixed terminal 4 (see FIG. 2).

In the initial first OFF state shown in FIG. 1, the push button 2 is arranged at the initial position by the spring force of the coil spring 7, and a gap is formed between the contacts 41 and 51. Also, the inclined surface 8a of the slide block 8
Are engaged with the inclined surface 2b of the hole 2a of the push button 2.

Next, the operation of the push button switch 1 according to the present embodiment will be described with reference to FIGS. When the push button 2 is pushed in from the initial first OFF state shown in FIG. 1, the switching mechanism 6 moves downward together with the push button 2 via the slide block 8 as shown in FIG. The contact 51 of the terminal 5 comes into contact with the contact 41 of the fixed terminal 4 on the case 3 side to be turned on.

In this ON state, a pressing force is exerted on the inclined surface 8a of the slide block 8 from the inclined surface 2b of the hole 2a of the push button 2 so as to immerse the slide block 8 inward. Since the spring force of the coil spring 9 mounted in the hole 61a of the switching mechanism 6 is stronger than this pressing force, the slide block 8 does not sink into the hole 61a.

At this time, a gap t is formed between the stepped portion 62a of the shaft portion 62 of the switching mechanism 6 and the stopper surface 31c in the hole 31b of the bottom portion 31 of the case 3.

When the push button 2 is further depressed from the ON state shown in FIG. 3, as shown in FIG.
While the 1 is in contact with the contact 41 of the fixed terminal 4, the stepped portion 62 a of the shaft portion 62 of the switching mechanism 6 comes into contact with the stopper surface 31 c on the case bottom 31 side, and the gap t becomes zero. Further, at this time, as shown by the broken line in FIG. 4, the protrusion 22 below the push button 2 overlaps the movable terminal 5 in the direction perpendicular to the paper surface.

When the push button 2 is further pushed in from this state, the inclined surface 8 of the slide block 8 is
The pressing force acting on “a” overcomes the spring force of the coil spring 9 in the hole 61a, and as shown in FIG. 5, the slide block 8 slides inward, and the slide block 8 sinks into the hole 61a. Thereby, the engagement between the inclined surface 2b of the push button 2 and the inclined surface 8a of the slide block 8 is released.

On the other hand, at this time, the hole 31 of the case bottom 31 is
The coil spring 12 in b is contracted, and the spring force of the coil spring 12 acts on the stepped portion 62 a of the shaft portion 62. Therefore, when the inclined surface 2b of the push button 2 is disengaged from the inclined surface 8a of the slide block 8, the entire switching mechanism 6 is moved toward the push button 2 by the spring force of the coil spring 12, as shown in FIG. Moving. Thereby, the contact 51 of the movable terminal 5 is separated from the contact 41 of the fixed terminal 4 to be in the second OFF state.

As described above, when the inclined surface 8a of the slide block 8 is disengaged from the inclined surface 2b of the hole 2a of the push button 2, the ON state is shifted to the second OFF state. From the ON state to the second OF
The transition to the F state is performed stably, whereby the operation can be stabilized.

Next, when the push button 2 is further pressed from the second OFF state shown in FIG. 6, as shown in FIG.
The projection 22 below the push button 2 is the bent part 4 of the fixed terminal 4.
a by pressing down the contact 41 while contacting the contact 4a.
1 is forcibly separated from the contact 51 of the movable terminal 5. Thereby, even if the contacts are welded to each other, the contacts 41 and 51 can be forcibly separated from each other, whereby the transition from the ON state to the second OFF state is more reliably performed. Will be done.

It is to be noted that the projection 41 is not provided at the lower part of the push button 2 and the contact 41 of the fixed terminal 4 is
May be pushed down, or the fixed terminal 4
May be provided on the side of the bent portion 4a.

On the other hand, from the state shown in FIG. 5, even if the coil spring 12 is broken and the spring force of the coil spring 12 does not act on the shaft portion 62 of the switching mechanism 6, the push button 2 is pushed in. By
Since the projection 22 under the push button 2 forcibly pushes the contact 41 of the fixed terminal 4 downward, it is possible to reliably shift from the ON state to the second OFF state (see FIG. 8).

Next, the relationship between the operation load applied to the push button 2 and the operation stroke when operating the push button switch 1 will be described with reference to FIG. Note that the circled numbers in the figure correspond to the figure numbers, respectively.

The first first OFF state shown in FIG.
The operation load gradually increases with the increase of the operation stroke until the state moves from the ON state to the state () shown in FIG. Next, from the state () shown in FIG.
When the state shifts to the state (1), the operation stroke hardly increases, and the operation load sharply increases. this is,
This is because a large load is required to immerse the slide block 8 inward.

Next, when shifting from the state () shown in FIG. 5 to the state () shown in FIG. 6, the operating load is sharply reduced. This is because the push button 2 and the slide block 8 are disengaged. When the operator panics and presses the push button 2 strongly during the operation in the ON state, it is preferable that the push button 2 becomes lighter. Can be smoothly shifted to the OFF state. At this time, the operator can obtain a click feeling (operation feeling).

Next, until the state () shown in FIG. 6 shifts to the state () shown in FIG. 7, the operation load gradually increases with the increase of the operation stroke. At this time, the projection 22 of the push button 2 is gradually pushing down the contact 41 of the fixed terminal 4.

As described above, according to the present embodiment, the engagement between the inclined surface 8a of the slide block 8 and the inclined surface 2b of the push button 2 is released, so that the state is shifted from the ON state to the second OFF state. From the ON state.
Is stably transferred to the OFF state, whereby the operation is stabilized.

In the transition from the ON state to the second OFF state, the contact 51 of the movable terminal 5 is changed to the contact 4 of the fixed terminal 4 by the movement of the switching mechanism 6 toward the push button 2.
The contact 41 is separated from the contact 51 as the protrusion 22 of the push button 2 pushes down the contact 41 while moving away from the contact 1. Thus, even if the contacts are welded to each other, the contacts 41 and 51 can be reliably separated from each other. In this way, O
The transition from the N state to the second OFF state is reliably performed,
Operation is more stable.

Further, in this embodiment, since the fixed terminal 4 is formed of a single band-shaped member, the number of parts can be reduced and the structure can be simplified.

< Second Embodiment > Next, a second embodiment of the present invention will be described with reference to FIGS. FIG.
0 is a schematic configuration diagram of a longitudinal section of a push button switch according to a second embodiment of the present invention, FIG. 11 is a sectional view taken along line XI-XI of FIG.
12 and 17 are diagrams for explaining the operation of the push button switch, and FIGS. 18 and 19 are enlarged views of fixed terminals in the push button switch. FIGS. 10 to 17 correspond to FIGS. 1 to 8 of the first embodiment, respectively. In the respective drawings, the same reference numerals as those in the first embodiment denote the same or corresponding parts.

In the second embodiment, only the structure of the fixed terminal is different from that of the first embodiment.
Here, only the fixed terminal portion will be described, and detailed description of the other portions will be omitted.

In FIG. 10 to FIG.
The fixed terminal 40 disposed on one side is mainly composed of a fixing metal 42 fixed to the bottom 31 and a movable metal 43 rotatably supported by the fixing metal 42.

An upright plate 42a extending upward is provided at one end of the fixing bracket 42, and one end 43a of the movable bracket 43 is engaged with the lower end of the upright plate 42a. With this configuration, the movable fitting 43 is vertically rotatable about the lower end of the standing plate portion 42a as a fulcrum.

As shown in FIG. 11 and FIG. 18, regulating plates 42b for regulating the upward movement of the movable fitting 43 are provided at both ends of the standing plate 42a. 10, FIG. 12 to FIG. 17 show a state in which the regulating plate portion 42b is omitted for convenience of illustration.

A coil spring 44 is provided between the upright plate 42a and the movable bracket 43. One end of the coil spring 44 is locked to the standing plate portion 42 a, and the other end is locked to a substantially central portion of the movable fitting 43. Due to the spring force of the coil spring 44, the movable fitting 43 is constantly urged in a direction of turning upward.

As shown in FIG. 11, the movable bracket 43 is a substantially T-shaped member in a plan view.
) Contacts 41 are provided.

In the initial first OFF state shown in FIG. 10, the push button 2 is disposed at the initial position by the spring force of the coil spring 7, and a gap is formed between the contacts 41 and 51. Also, the inclined surface 8 of the slide block 8
a is engaged with the inclined surface 2b of the hole 2a of the push button 2.

When the push button 2 is pushed in from this state, as shown in FIG. 12, the switching mechanism 6 moves downward together with the push button 2 via the slide block 8, and the contact 51 of the movable terminal 5 of the switching mechanism 6 is moved. Fixed terminal 40
And the contact 41 is turned on.

At this time, the inclined surface 8 of the slide block 8
a is applied with a pressing force inward from the inclined surface 2b on the push button 2 side. Since the spring force of the coil spring 9 in the switching mechanism 6 is stronger than this pressing force,
The slide block 8 does not enter the hole 61a.

At this time, the hole 31 in the case bottom 31 is
b, the stepped portion 62a of the shaft portion 62 and the stopper surface 3
1c, a gap t is formed.

When the push button 2 is further depressed from the ON state shown in FIG. 12, the shaft of the switching mechanism 6 is kept in a state where the contact 51 of the movable terminal 5 is in contact with the contact 41 of the fixed terminal 40 as shown in FIG. The stepped portion 62a of the portion 62 abuts against the stopper surface 31c on the case bottom 31 side, and the gap t
Becomes 0. At this time, as shown by the broken line in FIG. 13, the projection 22 below the push button 2 overlaps the movable terminal 5 in the direction perpendicular to the plane of the paper.

When the push button 2 is further pushed in from this state, the inclined surface 8 of the slide block 8 is
a overcomes the spring force of the coil spring 9 in the hole 61a, and the slide block 8 slides inward as shown in FIG.
Is immersed in the hole 61a. Thereby, the engagement between the inclined surface 2b of the push button 2 and the inclined surface 8a of the slide block 8 is released.

On the other hand, at this time, the hole 31 in the case bottom 31 is
The coil spring 12 in b is contracted, and the spring force of the coil spring 12 acts on the stepped portion 62 a of the shaft portion 62. Accordingly, when the inclined surface 2b of the push button 2 is disengaged from the inclined surface 8a of the slide block 8, the entire switching mechanism 6 is moved toward the push button 2 by the spring force of the coil spring 12, as shown in FIG. Moving. As a result, the contact 51 of the movable terminal 5 is
From the contact 41 in the second OFF state.

As described above, when the inclined surface 8a of the slide block 8 is disengaged from the inclined surface 2b of the hole 2a of the push button 2, the ON state is shifted to the second OFF state. Therefore, as in the case of the first embodiment, the transition from the ON state to the second OFF state is performed in a stable manner, whereby the operation can be stabilized.

Next, when the push button 2 is further pushed in from the second OFF state shown in FIG. 15, the projection 22 below the push button 2 contacts the movable fitting 43 of the fixed terminal 40 as shown in FIG. The contact 41 is forcibly released from the contact 51 of the movable terminal 5 by making contact and pushing down the contact 41 (see FIG. 19). Thereby, even if the contacts are welded to each other, the contacts 41 and 51 can be forcibly separated from each other, whereby the transition from the ON state to the second OFF state is more reliably performed. Will be done.

In this case as well, the contact 41 of the fixed terminal 40 may be pushed down at the entire lower end of the push button 2 without providing the projection 22 below the push button 2, or A projection may be provided on the movable bracket 43 side.

On the other hand, even if the coil spring 12 is damaged and the spring force of the coil spring 12 does not act on the shaft portion 62 of the switching mechanism 6 from the state shown in FIG. As a result, the projection 22 under the push button 2 forcibly pushes the contact 41 of the fixed terminal 40 downward, so that the
It is possible to reliably shift from the state to the second OFF state (see FIG. 17).

Also in this case, the relationship between the operation load applied to the push button 2 and the operation stroke when operating the push button switch 1 is the same as that shown in FIG. 9 of the first embodiment. Become.

As described above, according to the present embodiment, the first
Similarly to the case of the embodiment, when the inclined surface 8a of the slide block 8 is disengaged from the inclined surface 2b of the push button 2, the state shifts from the ON state to the second OFF state. , The transition from the ON state to the second OFF state is performed stably, whereby the operation is stabilized.

As in the case of the first embodiment, when shifting from the ON state to the second OFF state,
The contact 51 of the movable terminal 5 is separated from the contact 41 of the fixed terminal 40 by the movement of the switching mechanism 6 to the push button 2 side, and the contact 41 is separated from the contact 51 by the projection 22 of the push button 2 pushing down the contact 41. It has become. Thus, even if the contacts are welded to each other, the contacts 41 and 51 can be reliably separated from each other. In this way, the transition from the ON state to the second OFF state is reliably performed, and the operation is further stabilized.

Further, in the first embodiment, the fixed terminal 4 is formed by bending a steel strip into a substantially U-shape. Therefore, the fixed terminal 4 may vary depending on the material, thickness, etc. of the steel strip. The variation in the degree of bending at the bent portion 4a of the wire 4 becomes large, and it is not easy to keep the quality and performance of the fixed terminal 4 within a desired range. On the contrary,
In the present embodiment, since the spring property of the entire fixed terminal 40 depends on the coil spring 44, it is relatively easy to keep the quality and performance of the fixed terminal 40 within a desired range.

[0071]

As described above, in the push button switch according to the first aspect of the present invention, the engagement between the inclined surface of the slide block and the inclined surface inside the hollow of the push button is disengaged.
Since the transition from the ON state to the second OFF state is performed, the transition from the ON state to the second OFF state is performed stably, thereby providing an effect of stabilizing the operation.

In the pushbutton switch according to the second aspect of the present invention, when shifting from the ON state to the second OFF state, not only does the second contact point separate from the first contact point,
The first contact is separated from the second contact,
That is, each contact is separated from each other.
Therefore, even when the contacts are welded to each other, the contacts 41 and 51 can be forcibly separated from each other, whereby the transition from the ON state to the second OFF state can be performed with certainty. Is further stabilized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a vertical cross section of a push button switch according to a first embodiment of the present invention.

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

FIG. 3 is a diagram for explaining the operation of a push button switch (FIG. 1).

FIG. 4 is a diagram for explaining the operation of a push button switch (FIG. 1).

FIG. 5 is a diagram for explaining the operation of a push button switch (FIG. 1).

FIG. 6 is a diagram for explaining the operation of the push button switch (FIG. 1).

FIG. 7 is a diagram for explaining the operation of the push button switch (FIG. 1).

FIG. 8 is a diagram for explaining the operation of the push button switch (FIG. 1).

FIG. 9 is a schematic diagram showing a relationship between an operation load and an operation stroke of a push button.

FIG. 10 is a schematic vertical cross-sectional configuration diagram of a push button switch according to a second embodiment of the present invention.

FIG. 11 is a sectional view taken along line XI-XI in FIG. 1;

FIG. 12 is a diagram for explaining the operation of the push button switch (FIG. 10).

FIG. 13 is a diagram for explaining the operation of the push button switch (FIG. 10).

FIG. 14 is a diagram for explaining the operation of the push button switch (FIG. 10).

FIG. 15 is a diagram for explaining the operation of the push button switch (FIG. 10).

FIG. 16 is a diagram for explaining the operation of the push button switch (FIG. 10).

FIG. 17 is a diagram for explaining the operation of the push button switch (FIG. 10).

FIG. 18 is an enlarged view of a fixed terminal of the push button switch (FIG. 10).

FIG. 19 is a diagram for explaining the operation of the fixed terminal (FIG. 18).

FIG. 20 is a schematic configuration diagram of a conventional push button switch.

FIG. 21 is a view for explaining the operation of a conventional push button switch.

FIG. 22 is a view for explaining the operation of a conventional push button switch.

FIG. 23 is an overall perspective view of a pendant provided with a conventional push button switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Push button switch 2 Push button 2a Hole 2b Inclined surface 22 Projection part 3 Case 4,40 Fixed terminal 41 (First) contact 5 Movable terminal 51 (Second) contact 6 Switching mechanism 61 Insertion part 62 Shaft part 8 Slide Block 8a Inclined surface 12 Coil spring (return spring)

Claims (2)

[Claims] 1. As the push amount of the push button increases,
A push button switch which is turned on from an initial first OFF state and further shifts to a second OFF state, comprising: a hollow push button; a case supporting the push button; and a case provided in the case. A first contact; a switching mechanism having one end inserted into the hollow interior of the push button, the other end extending into the case, and a second contact arranged at a position facing the first contact; A slide block is provided at one end of the switching mechanism so as to be slidable in a direction intersecting with the pushing direction of the push button, and the slide block has an inclined surface formed inside the hollow of the push button. An inclined surface that can be engaged is formed, and the case is provided with a return spring that biases the other end of the switching mechanism toward the push button. Push-button switch to the butterflies. 2. As the push amount of the push button increases,
A push button switch which is turned on from an initial first OFF state and further shifts to a second OFF state, comprising: a hollow push button; a case supporting the push button; and a case provided in the case; A first contact with which the lower end of the push button can abut, and one end inserted into the hollow interior of the push button, the other end extending into the case, and disposed at a position facing the first contact; A switching mechanism having a second contact point. A slide block is provided at one end of the switching mechanism so as to be slidable in a direction intersecting with a pressing direction of the push button. An inclined surface capable of engaging with an inclined surface formed inside the hollow is formed, and the case is provided with a return member for urging the other end of the switching mechanism toward the push button. Together are provided, in said second OFF state, the lower end of the push button is adapted to push down the first contacts downward,
A push button switch, characterized in that: