JP2003323832A - Enable switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a low height and space saving of an enable switch, and maintain simultaneity of an enable output switching even if pressed at the end of it. <P>SOLUTION: At the center part of the bottom face of a case of the enabled switch wherein a three-point action of OFF-ON-OFF is possible, an engaging member 12 wherein it is possible to push-in against a driving force, a movable spring 11, and a wire member 22 are installed. A pair of leg parts 23 are formed by folding the wire member, the movable spring is arranged between both of the leg parts, one end of the movable spring 11 is made to be engaged with the engaging member via the wire member, and a driving mechanism 10 is made to be formed by these engaging members, the movable spring 11, and the wire member. A plurality of contact points are installed at both sides of the driving mechanism, and the other end of the movable spring 11 is made to be linked to the contact point, the movable spring 11 is reversed by push-in of the engaging member, and the contact points 29 are made to be conducted, and the contact points are installed so as to be freely opened and separated by reversing in the opposite direction by a further push-in. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch capable of off-on-off three-position operation, and more particularly to an enable switch used for a safety device of equipment such as a teaching pendant of a robot or a machine tool.

When performing a teaching work for making a robot learn a motion, an operator must carry the work while holding a teaching pendant inside a safety fence and approaching a movable part of a machine.

The enable switch allows the robot to be taught only when the switch is on, and when the switch is turned off, the robot stops when abnormal operation of the robot occurs, so that the teaching work can be performed safely. It is one of the means.

Up to now, a push button switch has been used which is turned on while being pushed and turned off when the hand is released. During work, the robot is stopped if the finger is momentarily released or the teaching pendant is released. Had a function called.

However, depending on the teaching operator,
It is conceivable that the button may be pressed in reverse for abnormal robot operation. So, if you release your hand, it will stop,
In addition, the idea that a 3-position enable switch that stops even when pushed in is safer came out.

15 to 20 show a conventional enable switch. This enable switch is base 1
00, a cover 101 attached to the base, and a push button 103 slidably fitted in the opening 102 of the cover 101.

A pair of fixed pieces 104 are attached to the base 100, and these fixed pieces 104 have a curved spring portion 105, and a fixed contact 106 is provided at each tip of the spring portion. Has been.

The central portion of the base 100 is recessed to form a movable plunger holding portion 107, and the lower portion of the movable plunger 108 is slidably fitted to the holding portion 107. This movable plunger 108 has a spring 1
09, it is biased upward in FIG.

The movable plunger 108 is provided with a movable piece holder 110 and a slider holder 111. The movable piece holder 110 holds a movable piece 112, and the movable piece 112 has a holding spring. It is pressed against the upper end surface of the movable plunger 108 by 113.

The movable piece 112 is provided with a movable contact 114. Further, the slider holding portion 111 is provided with a slider holding hole portion 115 formed of a hole extending in a direction perpendicular to the axis line a of the movable plunger 108.

A slider 116 is slidably fitted in these slider holding holes 115, and the slider 1
16 is biased outward by a spring 117. Also,
A slanted surface 116a that slants upward inward is formed at the protruding end of the slider 116 from the holding hole 115.

A small inner diameter portion 118 and a large inner diameter portion 119 are formed on the inner peripheral surface of the push button 103, and a boundary portion between the small inner diameter portion 118 and the large inner diameter portion 119 is upwardly and inwardly. An inclined surface portion 120 that is inclined is provided so as to be engageable with the inclined surface 116a. Also, the cover 101 of the push button 103
The insertion portion is provided with a spring receiving portion 121 protruding outward from the lower end of the peripheral wall of the push button 103, and a pair of forced release pieces 122 hanging from the lower end surface of the peripheral wall.

A return spring 123 is provided between the spring receiving portion 121 of the push button 103 and the base 100. The spring force of the return spring 123 causes the push button 10 to move.
3 is biased upward.

Next, the operation of the above switch device will be described.

When the push button 103 is pushed down from the free position shown in FIG. 15 as shown in FIG. 16, the movable plunger 108 moves the return spring 123 via the slider 116.
The movable contact 114 is pushed down against the fixed contact 10
When the switch 6 is touched, the switch is turned on.

Further, as shown in FIG. 17, the push button 1
When 03 is pushed down, the movable plunger 108 comes into contact with the bottom surface of the movable plunger holding portion 107 and the spring portion 1
Since a reaction force for causing wiping of 05 is applied, the pushing operation of the push button 103 becomes suddenly heavy.

When the push button 103 is further depressed, as shown in FIG. 18, the push button 103 retracts the slider 116 into the slider holding hole portion 115 and disengages the inclined surface portion 120 downward from the inclined surface 116a. Therefore, the push-down operation of the push button 103 is suddenly lightened. In this way, the push button 103 is further lowered, and the forced opening piece 122 pushes down the fixed contact 106 accordingly, so that the fixed contact 103 is forcedly released from the movable contact 114, and the switch device is turned off.

On the other hand, when the slider 116 moves backward, as shown in FIG.
As shown in FIG. 9, since the movable plunger 108 is lifted by the urging force of the spring 109, the slider holding portion 111 contacts the top wall of the push button 103.

Further, when the push button 103 is pushed down, as shown in FIG. 20, the forced separation piece 122 further descends to bend the spring portion 105, and the movable plunger 108 is pushed down to move the movable plunger holding portion. 10
Contact the bottom of 7.

When the pushing of the push button 103 is released, the push button 103 is pushed up by the spring force of the return spring 123, and the switch is returned to the free position state shown in FIG. 15 in the off state.

[0021]

In the above-mentioned conventional switch device, when the push button 103 is pushed from the free position, the movable plunger 108 is pushed down against the return spring 123 via the slider 116, and the movable contact. 114
Touches the fixed contact 106 to turn on the switch, but at the time of switching to this on state, no click feeling is felt and the operator cannot be aware of where the switch is now. It was

Further, in the above-described conventional switch device, the cylindrical push button 103 pushes down the movable contact 114 via the slider 116 and the slider holding portion 111, but the contact portion between the slider 116 and the push button 103 is
Two inclined surface portions 120 formed on the peripheral wall of the push button,
120, the slider 116 does not contact the central portion of the push button top wall.

Therefore, when the push button 103 is pushed to the end, the slider holding portion 111 tilts and descends, so that only one of the two movable contacts 114, 114 may contact the fixed contact 106. However, there is a possibility that the enable outputs may not open and close at the same time.

Further, in the above conventional device, the fixed contact 1
Since the slider holding portion 111 is provided above 06 and a plurality of springs are used, the space efficiency is poor and the number of parts is large.

The present invention has been made in view of the above-mentioned problems, and it is possible to secure the simultaneity in which the enable outputs are simultaneously opened and closed, and to reduce the height and the space.
An object of the present invention is to provide an enable switch capable of providing a switch with redundancy and giving a necessary click feeling.

[0026]

In order to achieve the above object, the present invention provides a contact part drive mechanism in a switch case, and a pair of movable pieces on both sides of the contact part drive mechanism. , One end of each of the movable pieces is provided separately from the fixed contact portion, and the other end is swingably provided on the switch case and cantilevered, and the contact drive mechanism includes: An engaging member that can be pushed against a biasing force through a plunger that is slidably fitted to the switch case and a bent portion that is bent and formed in a substantially U shape are provided on the engaging member. The two legs are engaged with each other and are arranged between the wire member attached to the switch case and the two legs of the wire member, and one end of the wire member is engaged with the bent portion of the wire member and the other end thereof is For connecting members that connect the other ends of the movable pieces A movable spring to be fitted, and by pushing the engaging member through the plunger, the movable spring is reversed in the pushing direction, and the movable contact portion is formed through the connecting member and the movable piece. The wire member is brought into contact with the switch case by moving the fixed contact portion toward the fixed contact portion and bringing the fixed contact portion into contact with the fixed contact portion so as to be in a switch-on state, and further pushing the engaging member through the plunger. Is configured to move relative to the engaging member and disengage from the engaging portion, and the disengagement causes the movable spring to reverse so that the movable contact portion is separated from the fixed contact portion to be in a switch-off state. Cage,
When the pushing force of the engaging member is released from this state,
The wire member is relatively moved with respect to the engaging member by the returning movement of the engaging member due to the urging force so that the wire member can be engaged at the original engaging position.

Therefore, according to the present invention, since the drive mechanism, the movable piece and the contact are provided in a part of the switch case,
Since the parts can be integrated in a predetermined part of the switch case, and these parts are not stacked in the height direction, the height can be shortened, which saves space and height, and enables teaching pendant and When the wire is stored in a storage box used as a safety device for equipment such as machine tools, the wiring is easily routed, and the degree of freedom in designing an operating device in a teaching box, a safety device, or the like is increased.

Further, since a plurality of contacts are made,
It is possible to add redundancy to the switch.

Further, since the movable piece having the movable contact portion is supported in a cantilever manner, it is possible to transmit the reversing force of the movable spring to the movable contact portion in a responsive manner, so that the click feeling at the time of switching on. In addition to being satisfactorily obtained, the trajectory of the operation of the movable contact portion becomes constant, and the simultaneity that the enable outputs are simultaneously opened and closed is secured.

Furthermore, since the movable spring is arranged between both legs of the wire member, the height and space can be further reduced, and the number of springs is one, so that the number of parts can be reduced. Is possible.

Furthermore, when the enable switch is turned on, the movable spring is reversed so that the movable contact portion can contact the fixed contact portion, so that the operator can feel a click when the switch is turned on.

According to the present invention, the inner surface of the switch case is formed into a cylindrical shape, and a pair of support pieces for supporting the movable piece in a cantilever manner is formed on the switch case. It is conceivable to arrange the pair of contact portions so as to form a quadrangle in the central portion of the switch case.

Therefore, according to the present invention, since the supporting piece and the contact are arranged on the switch case as described above, it is easy to make the switch case cylindrical.

Further, according to the present invention, the tip end portion of the engaging member extends toward the central side of the switch case, and the extending portion is brought into contact with the plunger to receive the pushing force of the plunger. It is conceivable to form a part.

Therefore, according to the present invention, since the pressure receiving portion is located in the center of the switch case, even if the operation plunger is pushed, the operation plunger always comes into contact with the pressure receiving portion, so that the engaging member is inclined. It is possible to lower without moving, thus ensuring the simultaneity that the enable outputs are simultaneously opened and closed.

Furthermore, according to the present invention, it is conceivable that a projecting piece for forcibly disengaging the contact portion is provided so as to project from the other end of the movable piece so that a part of the plunger can be engaged.

Therefore, according to the present invention, even if the contact may be welded, the plunger forcibly pushes the protrusion, so that the movable contact is reliably separated from the fixed contact and the switch is operated. Safety is ensured because it is turned off.

Still further, according to the present invention, the connecting member is
The movable spring has a protrusion engaged with the movable spring, is located between the other ends of the pair of movable pieces, is connected to the other ends, and is displaced by reversing the movable spring to have the movable contact portion. It is conceivable to provide the movable piece so as to be swingable.

Therefore, since the present invention has the connecting member, the reversing force of the movable spring is transmitted to the movable piece smoothly and surely.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an enable switch according to the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 9, the enable switch 1 includes a drive mechanism 10, a contact 29 and a movable piece 3.
A plunger 50 is slidably fitted into a bottomed tubular switch case 40 accommodating 3 and the like.

The drive mechanism 10 has a movable spring 11, an engaging member 12 and a wire member 22 as main constituent elements. These will be sequentially described below.

The movable spring 11 is composed of a coil spring, and is located at the center of the switch case 40 as described later.

The engaging member 12 is formed of an engaging member main body 13 and a pressure receiving plate 14, and the engaging member main body 13 includes the movable spring 1.
It is provided in the vicinity of one end portion of No. 1.

Guide ridges 15 are vertically provided on both side surfaces of the engagement member main body 13. On the other hand, from the bottom surface of the switch case 40, a pair of groove-shaped guide pillars 15a are erected, and the guide ridges 15 are slidably fitted to the groove-shaped guide pillars 15a. Further, on the inner side surface of the engagement member main body 13, as clearly shown in FIG. 6, an engagement protrusion 16 formed from both inclined surfaces of an upward inclined surface and a downward inclined surface is formed.

Further, a spring accommodating hole 17 having a lower surface opening is formed inside the engaging member main body 13, and a return spring 18 composed of a coil spring is provided in the accommodating hole 17 and a lower end of the spring is located at the bottom of the switch case. The engaging member main body 13 is housed so as to be able to be urged upward by contacting with.

From the upper end of the engaging member main body 13, a pressure receiving plate 14 is provided above the movable spring 11, and the tip of this pressure receiving plate 14 is located at the center of the case as shown in FIG. It reaches above the crossing central line L. Also, the pressure receiving plate 1
A pressure receiving portion 20 is formed on the upper surface of the tip portion of No. 4, which is a ridge extending in the length direction of the center line L.

Further, a notch 21 is formed in the central portion of the pressure receiving plate 14, and this notch 21 prevents the pressure receiving plate 14 and the movable spring 11 from interfering with each other when the pressure lowering is performed. There is.

The wire member 22 is formed by bending a wire into a substantially U-shape to form a pair of leg portions 23, 23, and both leg portions 2
The both end portions of the wire rod connecting the base ends of Nos. 3 and 23 are shown in FIG.
As shown in FIG. 3, the engaging portion 22a for the engaging member is formed, and the engaging portion 22a is formed on the engaging protrusion 1 of the engaging member main body 13.
6 is engaged. Note that the U-shape means that the wire is bent so that a pair of legs is formed, and therefore, even if it is V-shaped, it is not included in the U-shape. Of course. On the other hand, the central portion of the wire connecting the base ends of the two leg portions 23, 23 is bent toward the movable spring 11 to form the movable spring engaging portion 24.

The base end sides of the two leg portions 23, 23 are bent downward to form a bent portion 25 which is upwardly U-shaped in side view. Locking claws 25a, 25a rising from the bottom surface of the switch case are formed on both sides of the bending parts 25, 25, and the bending part 2 is formed on the locking claws 25a, 25a.
5, 25 are engaged.

The tips of the legs 23, 23 are bent outward to form shafts 23a, 23a. The shafts 23a, 23a are located near the other end of the movable spring 11 in the switch case. It is rotatably inserted into two shaft holes formed in the upper end of the standing piece 26 standing upright from the partial bottom surface.

The movable spring 11 is arranged between the two leg portions 23, 23 of the wire member 22 in a contracted state with the engaging member 12 side facing upward, and one end of the movable spring 11 has a spring engaging portion 24. To the movable piece 3 described later.
It is fitted to the fitting protrusion 28 of the connecting member 27 that is connected to 3.

In plan view of the drive mechanism 10, the contacts 29 provided on both sides of the drive mechanism 10 are composed of an upper fixed contact portion 30 and a lower movable contact portion 31, and the fixed contact portion 30 is
It is attached to the upper end of a fixing piece 32 which is provided so as to penetrate the bottom plate 41 of the case 40. On the other hand, the movable contact portion 31 is attached to a movable piece 33 described later.

The pair of movable pieces 33, 33 has one end swingably engaged with a support piece 34 penetrating the switch case bottom plate 41 and standing on both sides of the engagement member main body 13. The other ends of the movable pieces 33, 33 are inclined obliquely downward.

On both sides of the wire member 22, movable pieces 33,
33 are arranged. The tip ends of the inclined portions of the movable pieces 33, 33 are bent inward, and the movable contact portion 31 is attached to the bent portions, and the attachment pieces 33a are attached from the bent portions.
And the projecting piece 35 are projected to attach the mounting piece 33a to the connecting member 2
It is fixed to the side of 7.

The upper limit of the sliding range of the connecting member 27 is
The movable contact portion 31 contacts the fixed contact portion 30 when the switch is turned on, and the lower limit is determined by pressing the connecting member 27 by the movable spring 11 when the switch is turned off.

On the other hand, an operating plunger 50 for pushing the engaging member is slidably fitted in the switch case 40, and a projecting piece protruding from the movable piece 33 is provided on the peripheral wall of the operating plunger 50. A push-in step portion 51 is formed which can push in 35. The pushing step portion 51 and the projecting piece 35 are used for forcibly opening the contact point 29 as described later.

The switch case 40 is formed in a cylindrical shape and a pair of support pieces 3 for supporting the movable pieces 33, 33.
It is preferable that a line connecting the wires 4, 34 and the pair of contacts 29, 29 is formed in a square shape in the central portion of the switch case. By arranging in this way, it becomes easy to form the switch case 40 into a cylindrical shape with excellent space efficiency.

Further, the switch case 40 is provided with an outward flange 41 as a mounting seat on the upper end portion of its bottomed peripheral wall. The outer peripheral surface of the bottomed peripheral wall is formed in a polygonal shape, preferably an octagonal shape, and the polygonal peripheral wall is formed by a flat surface and a screw surface on which a male screw is formed. It is desirable to arrange them alternately.

As shown in FIG. 7, such a switch case 40 is fitted in a mounting hole formed in a panel 42 such as a teaching pendant, and as shown in FIG. Screwed onto the thread surface of the rectangular metal fitting 4 or as shown in FIG.
4 is fitted on the flat surface of the peripheral wall of the switch case to prevent the switch case from coming out of the mounting hole.

Next, the operation of this embodiment will be described.

FIG. 3 shows an initial state in which no operation force is applied to the operation plunger 50. In this initial state, the movable spring 11 is in an inclined state with the side of the engaging member 12 facing upward, and a downward force is applied to the movable contact portion 31 via the connecting member 27 to fix the movable contact portion 31. The switch is turned off by separating the contact portion 30 downward.

Now, as shown in FIG. 10, when the engaging member 12 is pushed down by the operation of the operation plunger 50, one end of the movable spring 11 descends accordingly, and as shown in FIG. The movable spring 11 is rapidly inverted downward at the time point when it overlaps the dotted line in the initial state connecting the engagement point A of the member 22 and the engagement member main body 13 and the connection point B of the movable spring 11 and the connection member 27. An upward force is applied to the movable contact portion 31.

As a result, the movable contact portion 31 becomes the fixed contact portion 3
By colliding with 0, the contact 29 becomes conductive and the switch is turned on. At this time, the movable contact 31 collides with the fixed contact 30 to generate a click sound. This state is shown in FIG. 11, and the teaching operation of the robot is performed in this ON state.

When the operation plunger 50 is pushed down, the top wall of the plunger is pressed by the pressure receiving portion 20 of the engaging member 12.
Therefore, the engagement member 12 does not tilt even when the operation plunger 50 is pushed to the end, in other words, the pressure receiving plate 14 descends while maintaining a substantially horizontal state.

During the robot teaching work, etc., the operator is surprised by the abnormal behavior of the robot and the operator operates the operation plunger 50.
11 is pushed in from the on state of FIG. 11, the wire member 22
12 further descends, and as shown by the arrow Y in FIG. 12, the bent portion 25 comes into contact with the bottom surface of the switch case, so that the engagement member engagement portion 22a gets over the engagement projection 16.

Then, as shown in FIG. 13, the movable spring 1
1 rapidly reverses upward and exerts a downward force on the movable contact portion 31 to separate the movable contact portion 31 downward from the fixed contact portion 30 to turn off the switch, and at the same time, as shown in FIG. The bent portion 25 engages with the locking claw 25a.

On the other hand, as shown in FIG. 12, when the operating member 50 is pushed in, the engaging member engaging portion 22a passes over the engaging projection 16, and the pushing step 51 is pushed onto the projection 35 from above. It engages and pushes down this protrusion 35.
Therefore, even if the movable contact portion 31 is welded to the fixed contact portion 30, the movable contact portion 31 is reliably separated from the fixed contact portion 30.

The operation plunger 50 is pushed down in FIG.
In the OFF state shown in FIG. 4, when the hand is released from the operation plunger 50, the engaging member 12 rises by the urging force of the return spring 18, so that the wire member 22 engaged with the locking claw 25a.
Engages with the engaging protrusion 16 and returns to the initial state shown in FIG.

[0070]

According to the present invention, the contact part drive mechanism is arranged in the switch case, and the pair of movable pieces are arranged on both sides of the contact part drive mechanism. The movable contact portion is provided separately from the switch contact portion, the other end portion is swingably provided on the switch case and cantilevered, and the contact drive mechanism is slidably fitted to the switch case. The engaging member that can be pushed in against the urging force through the plunger and the bent portion formed by being bent into a substantially U shape engages with the engaging member, and both legs are attached to the switch case. A connection that is arranged between the attached wire member and both legs of the wire member, and has one end that engages with the bent portion of the wire member and the other end that connects the other ends of the movable pieces. And a movable spring that engages with the member, When the engaging member is pushed in via the runner, the movable spring is reversed in the pushing direction, and the movable contact portion is moved in the fixed contact portion direction through the connecting member and the movable piece to move to the fixed contact portion. When the switch member is brought into contact with the switch member and the engaging member is further pushed through the plunger, the wire member comes into contact with the switch case to move relative to the engaging member and the engaging portion. And the movable spring is reversed by this separation to switch off the movable contact portion from the fixed contact portion, and the pushing force of the engaging member is changed from this state. When released, the wire member moves relative to the engaging member due to the return movement of the engaging member due to the biasing force, and the original engaging position can be engaged. Achieve the effect.

Since the drive mechanism, the movable piece, and the contact are provided in a part of the case, the parts can be integrated in a predetermined part of the switch case. Moreover, since these parts are not stacked in the height direction, the height is low. As a result, it is possible to save space and reduce the height, and when storing in a storage box used as a safety device for equipment such as teaching pendants and machine tools, the wiring can be easily routed, and the teaching box and safety device can be used. The degree of freedom in designing the operating device is increased.

Further, since a plurality of contacts are made,
It is possible to add redundancy to the switch.

Further, since the movable piece having the movable contact portion is supported in a cantilever manner, it is possible to transmit the reversal force of the movable spring to the movable contact portion in a responsive manner. In addition to being satisfactorily obtained, the trajectory of the operation of the movable contact portion becomes constant, and the simultaneity that the enable outputs are simultaneously opened and closed is secured.

Furthermore, since the movable spring is arranged between both legs of the wire member, the height and space can be further reduced, and the number of springs is one, so that the number of parts can be reduced. Is possible.

Furthermore, when the enable switch is turned on, the movable spring is reversed so that the movable contact portion can come into contact with the fixed contact portion, so that the operator can feel a click when the switch is turned on.

[Brief description of drawings]

FIG. 1 is a perspective view of an enable switch according to the present invention.

FIG. 2 is likewise a perspective view in which a part of FIG. 1 is cut away.

FIG. 3 is a sectional view of the enable switch, showing an initial state in which no pushing force is applied.

FIG. 4 is likewise a plan view with the plunger removed.

FIG. 5 is likewise a plan view with the engagement member removed.

FIG. 6 is likewise an exploded view of the enable switch.

FIG. 7 is likewise a perspective view showing a state in which an enable switch is attached to a panel.

FIG. 8 is a perspective view of FIG. 7 as seen from below.

9 is a perspective view of FIG. 7 seen from below, which is a modification of FIG. 8.

[FIG. 10] Similarly, it is a cross-sectional view showing an initial stage of pushing the plunger.

FIG. 11 is a sectional view showing an ON state by reversing the movable spring.

FIG. 12 is a sectional view showing a state where the wire member is in contact with the bottom surface of the switch case by pushing the plunger.

[FIG. 13] Similarly, it is a cross-sectional view showing a state in which the wire member has passed over the engagement protrusion of the engagement member.

FIG. 14 is a sectional view showing a switch-off state in which the wire member is engaged with the engaging claw and the movable spring is completely inverted upward.

[FIG. 15] FIG. 15 is an operation explanatory view of a conventional example in a free state.

FIG. 16 is likewise an explanatory diagram of an operating state.

FIG. 17 is likewise an explanatory diagram of an operating state.

FIG. 18 is likewise an explanatory diagram of an operating state.

FIG. 19 is likewise an explanatory diagram of an operating state.

FIG. 20 is also an operation explanatory diagram of an operation limit position.

[Explanation of symbols]

10 Enable switch 11 Movable spring 12 Engagement member 13 Engagement member body 14 Pressure plate 16 Engagement protrusion 18 Return spring 20 Pressure receiving part 21 Notch 22 Wire member 23 legs 25 Folding part 25a locking claw 26 Standing piece 27 Connection member 28 Fitting protrusion 29 contacts 30 fixed contact 31 Moving contact part 33 movable pieces 35 prongs 40 switch case 50 Plunger

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Claims (5)

[Claims] 1. A contact part drive mechanism is arranged in a switch case, and a pair of movable pieces is arranged on both sides of the contact part drive mechanism. One end of each movable piece is movable with respect to a fixed contact part. The contact portions are provided separately, and the other end portion is swingably provided on the switch case and cantilevered, and the contact drive mechanism is provided via a plunger slidably fitted to the switch case. And a wire having both legs attached to the switch case and an engaging member that can be pushed in against the urging force and a bent portion formed by bending in a substantially U shape engage with the engaging member. Member and between the two leg portions of the wire member, one end of which engages with the bent portion of the wire member and the other end of which engages with a connecting member that connects the other ends of the movable pieces. And a movable spring that By pushing the engaging member through the movable spring, the movable spring is reversed in the pushing direction, and the movable contact portion is moved toward the fixed contact portion through the connecting member and the movable piece so as to come into contact with the fixed contact portion. The switch member is configured to be in a switch-on state, and by further pushing the engaging member through the plunger, the wire member comes into contact with the switch case and thereby moves relative to the engaging member and disengages from the engaging portion. Then
By this separation, the movable spring is reversed so that the movable contact portion is separated from the fixed contact portion to be in a switch-off state, and when the pushing force of the engaging member is released from this state,
An enable switch characterized in that the wire member is moved relative to the engaging member by the return movement of the engaging member by the urging force so that the wire member can be engaged at the original engaging position. 2. An inner surface of the switch case is formed into a cylindrical shape, and a pair of support pieces for supporting the movable piece in a cantilever manner is formed on the switch case, and the pair of support pieces and the pair of contacts are formed. 2. The enable switch according to claim 1, wherein the parts are arranged so as to form a quadrangle in the central part of the switch case. 3. A pressure receiving portion is formed by extending a tip end portion of the engaging member toward a central side of the switch case, abutting the extending portion against the plunger, and receiving a pushing force of the plunger. The enable switch according to claim 1 or 2, wherein. 4. The projecting piece for forcibly opening the contact part, which is engageable with a part of the plunger, projects from the other end of the movable piece. Enable switch. 5. The connection member has a protrusion with which the movable spring is engaged, is located between the other ends of the pair of movable pieces, and is connected to the other ends of the pair of movable pieces. The enable switch according to any one of claims 1 to 4, wherein the movable piece having the movable contact portion is displaced so as to be swingable.