JP4085686B2 - Enable switch - Google Patents

Description

[0001]
BACKGROUND 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.
[0002]
When performing a teaching work that causes the robot to learn the movement, the worker must enter the safety fence with the teaching pendant and work while approaching the moving parts of the machine.
[0003]
The enable switch can teach the robot only when the switch is on, and the robot will stop when the switch is turned off for abnormal robot operation. One means.
[0004]
The push button switch that is turned on while pressed and turned off when the hand is released is used, and the robot stops when the finger is released momentarily or the teaching pendant is released during work. had.
[0005]
However, depending on the teaching worker, there may be a case where the button is pushed in reverse to the abnormal operation of the robot. Therefore, the idea that a three-position enable switch that stops when released and stops when pressed is safer has come out.
[0006]
15 to 20 show a conventional enable switch. The enable switch includes a base 100, a cover 101 attached to the base, and a push button 103 slidably fitted in the opening 102 of the cover 101.
[0007]
A pair of fixed pieces 104 are attached to the base 100, and these fixed pieces 104 have curved spring portions 105, and fixed contacts 106 are provided at the tip portions of the spring portions, respectively. .
[0008]
A central portion of the base 100 is recessed and formed in a movable plunger holding portion 107, and a lower portion of the movable plunger 108 is slidably fitted into the holding portion 107. The movable plunger 108 is biased upward in FIG.
[0009]
The movable plunger 108 is provided with a movable piece holding part 110 and a slider holding part 111, and the movable piece holding part 110 holds a movable piece 112, which is moved by a holding spring 113. It is pressed against the upper end surface of the movable plunger 108.
[0010]
A movable contact 114 is provided on the movable piece 112. 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 a of the movable plunger 108.
[0011]
A slider 116 is slidably fitted in these slider holding holes 115, and the slider 116 is urged outward by a spring 117. In addition, an inclined surface 116 a that is inclined upward and inward is formed at the protruding end of the slider 116 from the holding hole 115.
[0012]
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 the boundary between the small inner diameter portion 118 and the large inner diameter portion 119 is inclined to incline upward and inward. The surface portion 120 is provided so as to be engageable with the inclined surface 116a. In addition, the insertion portion of the push button 103 into the cover 101 is provided with a spring receiving portion 121 that protrudes outward from the lower end of the peripheral wall of the push button 103 and a pair of forced separation pieces 122 that hang down from the lower end surface of the peripheral wall. It has been.
[0013]
A return spring 123 is provided between the spring receiving portion 121 of the push button 103 and the base 100, and the push button 103 is biased upward by the spring force of the return spring 123.
[0014]
Next, the operation of the switch device will be described.
[0015]
When the push button 103 is pushed down from the free position state shown in FIG. 15, the movable plunger 108 is pushed down against the return spring 123 via the slider 116, and the movable contact 114 contacts the fixed contact 106. Then, the switch is turned on.
[0016]
As shown in FIG. 17, when the push button 103 is further pushed down, the movable plunger 108 comes into contact with the bottom surface of the movable plunger holding portion 107 and a reaction force for causing wiping on the spring portion 105 acts. The pushing operation of 103 becomes suddenly heavy.
[0017]
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 115 and separates the inclined surface portion 120 downward from the inclined surface 116a. In addition, the push-down operation of the push button 103 becomes lighter. In this way, the push button 103 is further lowered, and the forced separation piece 122 pushes down the fixed contact 106 accordingly, so that the fixed contact 103 is forcibly separated from the movable contact 114 and the switch device is turned off.
[0018]
On the other hand, when the slider 116 moves backward, as shown in FIG. 19, the movable plunger 108 is raised by the biasing force of the spring 109, so that the slider holding portion 111 contacts the top wall of the push button 103.
[0019]
Further, when the push button 103 is pushed down, as shown in FIG. 20, the forced separation piece 122 is further lowered to bend the spring portion 105 and the movable plunger 108 is pushed down, so that the bottom surface of the movable plunger holding portion 107. To touch.
[0020]
When 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 returns to the free position state shown in FIG.
[0021]
[Problems to be solved by the invention]
In the conventional switch device, when the push button 103 is pushed in 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 comes into contact with the fixed contact 106. Although the switch is turned on, at the time of switching to the on state, a feeling of clicking is not felt and the operator cannot be aware of where the switch is now.
[0022]
In the above conventional switch device, the cylindrical push button 103 pushes down the movable contact 114 via the slider 116 and the slider holding portion 111. The contact portion between the slider 116 and the push button 103 is a peripheral wall of the push button. The slider 116 is not in contact with the central portion of the top wall of the push button.
[0023]
For this reason, when the push button 103 is pushed to the end, the slider holding portion 111 is inclined and lowered, so that only one of the two movable contacts 114 and 114 may come into contact with the fixed contact 106, and the enable output There was a risk of lack of simultaneous opening and closing.
[0024]
Further, in the above-described conventional apparatus, the slider holding portion 111 is provided above the fixed contact 106 and a plurality of springs are used, so that the space efficiency is low and the number of parts is large. It was.
[0025]
The present invention has been made in view of the above-described problems, and at the same time, the enable outputs can be simultaneously opened and closed, the height and space can be reduced, and the switch can be made redundant. Another object of the present invention is to provide an enable switch that can provide a necessary click feeling.
[0026]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a contact portion drive mechanism is arranged in a switch case, and a pair of movable pieces are arranged on both sides of the contact portion drive mechanism, and both movable pieces have one end fixed. The movable contact portion is provided apart from the contact portion, and the other end portion is swingably provided on the switch case and is cantilevered. Part The drive mechanism includes an engagement member that can be pushed against a biasing force via a plunger that is slidably fitted to the switch case, and a bent portion that is formed by being bent into a substantially U shape. A wire member that engages with the engaging member and has both leg portions attached to the switch case, and is disposed between the both leg portions of the wire member, and one end portion engages with the bent portion of the wire member and the other. A movable spring that engages with a connecting member that connects the other ends of the movable pieces, and the movable spring is pushed in by pushing the engaging member through the plunger. And the movable contact portion is moved in the direction of the fixed contact portion through the connecting member and the movable piece so as to be in a switch-on state in which the movable contact portion is brought into contact with the fixed contact portion. Press the joint member further By moving the wire member into contact with the switch case, the wire member moves relative to the engaging member and disengages from the engaging portion. By this disengagement, the movable spring is reversed to move the movable contact portion from the fixed contact portion. When the pushing force of the engaging member is released from this state, the wire member is moved relative to the engaging member by the return movement of the engaging member by the biasing force. It can be moved to engage the original engagement position. Further, the switch case inner surface is formed in a cylindrical shape, and a pair of support pieces for cantilevering the movable piece is formed on the switch case, the pair of support pieces, the movable contact portion, and the fixed A pair of contact points composed of contact points are arranged to form a square in the center of the switch case. It is characterized by that.
[0027]
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 case, the parts can be concentrated on a predetermined part of the switch case, and these parts are not stacked in the height direction. Therefore, it is possible to reduce the height, so that space saving and low profile can be achieved, and when storing in a storage box used for a safety device of equipment such as a teaching pendant or a machine tool, wiring is easy. The degree of freedom in designing the operation device in the teaching box or safety device is increased.
[0028]
In addition, since a plurality of contact points are provided, it is possible to provide the switch with redundancy.
[0029]
Furthermore, since the movable piece having the movable contact portion is cantilevered, it is possible to transmit the reversal force of the movable spring to the movable contact portion with a good response, and thus a good click feeling can be obtained when the switch is turned on. In addition, the trajectory of the operation of the movable contact portion is made constant, and the synchronism that the enable outputs are simultaneously opened and closed is ensured.
[0030]
Furthermore, since the movable spring is disposed between the leg portions 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. Become.
[0031]
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.
[0033]
Also The present invention The switch case inner surface is formed in a cylindrical shape, and a pair of support pieces that cantilever-support the movable piece is formed on the switch case, and the switch case includes the pair of support pieces, the movable contact portion, and the fixed contact portion. A pair of contact portions to be formed with a square in the center of the switch case Therefore, the switch case can be easily cylindricalized.
[0034]
Furthermore, the present invention provides a pressure receiving portion for receiving the pushing force of the plunger by extending the distal end portion of the engagement member toward the center of the switch case and bringing the extended portion into contact with the plunger. It is possible to do.
[0035]
Accordingly, in the present invention, since the pressure receiving portion is located at the center of the switch case, the operation plunger always comes into contact with the pressure receiving portion even when the operation plunger is pushed to the end. Therefore, the engaging member is lowered without being inclined. Therefore, it is possible to ensure the simultaneity that the enable outputs simultaneously open and close.
[0036]
Furthermore, in the present invention, a projecting piece for forcibly separating a contact portion that can be engaged with a part of the plunger is projected from the other end of the movable piece. Thought available.
[0037]
Therefore, according to the present invention, even if the contact may be welded, the plunger forcibly pushes the protruding piece, so that the movable contact portion is reliably separated from the fixed contact portion and the switch is turned off. Therefore, safety is ensured.
[0038]
Furthermore, in the present invention, the connecting member has a protrusion with which the movable spring is engaged, and is positioned between the other end portions of a pair of movable pieces and is connected to both the other end portions. It is conceivable to displace the movable piece having the movable contact portion by reversing the rotation of the movable piece.
[0039]
Therefore, since this invention has a connection member, the reversal force of a movable spring is smoothly and reliably transmitted to a movable piece.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an enable switch according to the present invention will be described below with reference to the drawings.
[0041]
As shown in FIGS. 1 to 9, the enable switch 1 has a plunger 50 slidably fitted in a bottomed cylindrical switch case 40 containing the drive mechanism 10, the contact 29, the movable piece 33, and the like. Yes.
[0042]
The drive mechanism 10 includes the movable spring 11, the engagement member 12, and the wire member 22 as main components. Hereinafter, these will be sequentially described.
[0043]
The movable spring 11 is formed of a coil spring and is located at the center of the switch case 40 as will be described later.
[0044]
The engaging member 12 is formed by an engaging member main body 13 and a pressure receiving plate 14, and the engaging member main body 13 is provided close to one end of the movable spring 11.
[0045]
The engaging member main body 13 has guide protrusions 15 provided vertically on both side surfaces thereof. On the other hand, from the bottom surface of the switch case 40, a pair of groove-shaped guide columns 15a is erected, and the guide protrusions 15 are slidably fitted into the groove-shaped guide columns 15a. Further, as clearly shown in FIG. 6, an engagement protrusion 16 is formed on the inner side surface of the engagement member main body 13. The engagement protrusion 16 is formed from both inclined surfaces of an upward inclined surface and a downward inclined surface.
[0046]
Further, a spring accommodating hole 17 having a lower opening is formed inside the engaging member main body 13, and a return spring 18 made of a coil spring contacts the lower end of the switch case with the bottom of the switch case. Thus, the engaging member main body 13 is accommodated so as to be biased upward.
[0047]
From the upper end of the engagement member main body 13, a pressure receiving plate 14 is projected above the movable spring 11, and the tip of the pressure receiving plate 14 is a center that crosses the center of the case as shown in FIG. It reaches above the line L. Further, a pressure receiving portion 20 made of a ridge extending in the length direction of the center line L is formed on the upper surface of the tip end portion of the pressure receiving plate 14.
[0048]
Further, a notch 21 is formed in the central portion of the pressure receiving plate 14, and the notch 21 prevents interference between the pressure receiving plate 14 and the movable spring 11 when lowered.
[0049]
The wire member 22 is formed by bending the wire material into a substantially U shape to form a pair of leg portions 23, 23, and connecting both end portions of the wire material connecting the base ends of both leg portions 23, 23 to FIG. As clearly shown, it is formed in the engaging member engaging portion 22 a, and this engaging portion 22 a is engaged with the engaging protrusion 16 of the engaging member main body 13. Note that the U-shape means that the wire is bent so that a pair of legs are formed, and therefore even if it is V-shaped, it is included in the U-shape. Of course. On the other hand, the central portion of the wire connecting the base ends of both the leg portions 23, 23 is bent in the direction of the movable spring 11 and formed in the movable spring engaging portion 24.
[0050]
Moreover, the base end side of both leg portions 23 and 23 is bent downward and formed into a U-shaped bent portion 25 facing upward in a side view. Locking claws 25a, 25a are formed on both sides of the bent portions 25, 25 from the bottom surface of the switch case, and the bent portions 25, 25 are engaged with the lock claws 25a, 25a. Yes.
[0051]
Further, the distal end portions of both leg portions 23 and 23 are bent outward to form shaft portions 23a and 23a. These shaft portions 23a and 23a are formed from the bottom surface of the switch case portion near the other end portion of the movable spring 11. It is rotatably inserted into two shaft holes formed at the upper end of the standing piece 26 that stands up.
[0052]
The movable spring 11 is disposed between the leg portions 23 and 23 of the wire member 22 in a contracted state with the engaging member 12 side being inclined upward, and one end is fitted to the spring engaging portion 24. At the same time, the other end is fitted to a fitting projection 28 of a connecting member 27 connected to a movable piece 33 described later.
[0053]
In plan view of the drive mechanism 10, the contacts 29 provided on both sides thereof are composed of an upper fixed contact portion 30 and a lower movable contact portion 31, and the fixed contact portion 30 penetrates the bottom plate 41 of the case 40. It is attached to the upper end of the fixed piece 32. On the other hand, the movable contact portion 31 is attached to a movable piece 33 described later.
[0054]
The pair of movable pieces 33, 33 is 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 so that one end thereof is swingably engaged. The other end portions of the movable pieces 33, 33 are inclined obliquely downward.
[0055]
On both sides of the wire member 22, movable pieces 33, 33 are arranged. The tips of the inclined portions of the movable pieces 33, 33 are bent inward, and the movable contact portion 31 is attached to the bent portion, and the attachment piece 33a and the protruding piece 35 are projected from the bent portion. The mounting piece 33 a is fixed to the side surface of the connecting member 27.
[0056]
The upper limit of the sliding range of the connecting member 27 is that the movable contact portion 31 contacts the fixed contact portion 30 when the switch is turned on, and the lower limit is that the connecting member 27 is pressed by the movable spring 11 when the switch is turned off. To be determined.
[0057]
On the other hand, an operating plunger 50 for pushing the engaging member is slidably fitted into the switch case 40, and a protruding piece 35 protruding from the movable piece 33 is pushed into the peripheral wall of the operating plunger 50. A possible pushing step 51 is formed. The pushing step portion 51 and the projecting piece 35 are used for forcibly opening the contact 29 as will be described later.
[0058]
The switch case 40 is formed in a cylindrical shape, and a line connecting the pair of support pieces 34 and 34 for supporting the movable pieces 33 and 33 and the pair of contacts 29 and 29 is a square in the center of the switch case. It is preferably formed and arranged. By arranging in this way, it becomes easy to form the switch case 40 in a cylindrical shape excellent in space efficiency.
[0059]
Further, the switch case 40 is provided with an outward flange 41 as a mounting seat at the upper end of the 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.
[0060]
Such a switch case 40 is fitted in a mounting hole formed in a panel 42 such as a teaching pendant as shown in FIG. 7, and as shown in FIG. In order to prevent the switch case from coming out of the mounting hole, a rectangular metal fitting 44 is fitted to the flat surface of the switch case peripheral wall as shown in FIG.
[0061]
Next, the operation of this embodiment will be described.
[0062]
FIG. 3 shows an initial state where no operating force is applied to the operating plunger 50. In this initial state, the movable spring 11 is in an inclined state with the engaging member 12 side upward, and the movable contact portion 31 is fixed by applying a downward force to the movable contact portion 31 via the connecting member 27. The switch is turned off by separating the contact portion 30 downward.
[0063]
Now, as shown in FIG. 10, when the engaging member 12 is pushed down by the operation of the operating plunger 50, one end of the movable spring 11 is lowered accordingly, and as shown in FIG. When the movable spring 11 overlaps with the dotted line in the initial state connecting the engagement point A of the engagement member main body 13 and the connection point B of the movable spring 11 and the connection member 27, the movable spring 11 is rapidly reversed downward to move the movable contact portion. An upward force is exerted on 31.
[0064]
Thereby, when the movable contact portion 31 collides with the fixed contact portion 30, the contact 29 is conducted and the switch is turned on. At this time, a click sound is generated when the movable contact portion 31 collides with the fixed contact portion 30. FIG. 11 shows this state, and the robot teaching work and the like are performed in this on state.
[0065]
When the operation plunger 50 is pushed down, the plunger top wall comes into contact with the pressure receiving portion 20 of the engagement member 12, so that the engagement member 12 does not tilt even if the operation plunger 50 is pushed to the end, in other words, The pressure receiving plate 14 descends while maintaining a substantially horizontal state.
[0066]
When the operator pushes down the operation plunger 50 from the ON state in FIG. 11 when the operator is surprised by the abnormal behavior of the robot during the teaching work of the robot, the wire member 22 is further lowered, as indicated by an arrow Y in FIG. Further, since the bent portion 25 comes into contact with the bottom surface of the switch case, the engaging member engaging portion 22 a gets over the engaging protrusion 16.
[0067]
Then, as shown in FIG. 13, the movable spring 11 rapidly reverses upward, exerting a downward force on the movable contact portion 31, moving the movable contact portion 31 downward from the fixed contact portion 30 and turning off the switch. At the same time, as shown in FIG. 14, the bent portion 25 engages with the locking claw 25a.
[0068]
On the other hand, as shown in FIG. 12, when the engaging member engaging portion 22 a gets over the engaging protrusion 16 due to the pressing of the operation plunger 50, the pressing step portion 51 engages with the protruding piece 35 from above. The protrusion 35 is pushed down. For this reason, 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.
[0069]
In the above-mentioned OFF state shown in FIG. 14 in which the operation plunger 50 is pushed down, when the hand is released from the operation plunger 50, the engaging member 12 is lifted by the urging force of the return spring 18, and therefore the wire engaged with the locking claw 25a. The member 22 engages with the engaging protrusion 16 and returns to the initial state shown in FIG.
[0070]
【The invention's effect】
In the present invention, a contact portion drive mechanism is arranged in a switch case, and a pair of movable pieces are arranged on both sides of the contact portion drive mechanism, and one end portion of each movable piece is a movable contact point with respect to a fixed contact portion. The other end portion is swingably provided on the switch case and is cantilevered, and the contact drive mechanism is slidably fitted to the switch case. An engaging member that can be pushed in against an urging force, and a wire member in which a bent portion formed by being bent in a substantially U shape engages with the engaging member and both legs are attached to the switch case. And one end part is engaged with the bent part of the wire member and the other end part is engaged with a connecting member that connects the other end parts of the movable piece. With a movable spring, and through the plunger When the engaging member is pushed in, the movable spring is reversed in the pushing direction, and the movable contact portion is moved in the direction of the fixed contact portion via the connecting member and the movable piece to come into contact with the fixed contact portion. The switch is configured to be in a switch-on state, and the engagement member is further pushed through the plunger, so that the wire member comes into contact with the switch case and moves relative to the engagement member to be separated from the engagement portion. The movable spring is inverted by this separation and is configured to be in a switch-off state in which the movable contact portion is separated from the fixed contact portion, and when the pushing force of the engagement member is released from this state, Since the wire member is moved relative to the engagement member by the return movement of the engagement member by the urging force and can be engaged with the original engagement position, the following effects can be obtained. .
[0071]
Since the drive mechanism, movable piece and contact point are provided in a part of the case, the parts can be concentrated in a predetermined part of the switch case, and these parts are not stacked in the height direction. Therefore, space saving and low profile can be achieved, and when storing in the storage box used for the safety device of equipment such as teaching pendants and machine tools, wiring can be easily routed, and operation in the teaching box and safety device etc. The degree of freedom in designing the device is increased.
[0072]
In addition, since a plurality of contacts are provided, it is possible to provide the switch with redundancy.
[0073]
Furthermore, since the movable piece having the movable contact portion is cantilevered, it is possible to transmit the reversal force of the movable spring to the movable contact portion with a good response, and thus a good click feeling can be obtained when the switch is turned on. In addition, the trajectory of the operation of the movable contact portion is made constant, and the synchronism that the enable outputs are simultaneously opened and closed is ensured.
[0074]
Furthermore, since the movable spring is disposed between the leg portions 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. Become.
[0075]
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 the drawings]
FIG. 1 is a perspective view of an enable switch according to the present invention.
2 is a perspective view in which a part of FIG. 1 is cut away. FIG.
FIG. 3 is a cross-sectional view of the enable switch, showing an initial state where no pushing force is applied.
FIG. 4 is also a plan view with the plunger removed.
FIG. 5 is also a plan view with the engagement member removed.
FIG. 6 is an exploded view of the enable switch.
FIG. 7 is a perspective view showing a state where the enable switch is attached to the panel.
FIG. 8 is a perspective view of FIG. 7 as seen from below.
9 is a perspective view of FIG. 7 as viewed from below and is a modification of FIG.
FIG. 10 is a cross-sectional view showing the initial stage of pushing in the plunger.
FIG. 11 is a cross-sectional view showing an ON state by reversing the movable spring, similarly;
FIG. 12 is a cross-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 is a cross-sectional view showing a state where the wire member has passed over the engaging protrusion of the engaging member.
FIG. 14 is a cross-sectional view showing a switch-off state in which the wire member is engaged with the engaging claw and the movable spring is completely turned upward.
FIG. 15 is an operation explanatory diagram of a free state of a conventional example.
FIG. 16 is also an explanatory diagram of an operation state.
FIG. 17 is also an explanatory diagram of an operation state.
FIG. 18 is also an explanatory diagram of an operation state.
FIG. 19 is also an explanatory diagram of an operation 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 Engaging protrusion
18 Return spring
20 Pressure receiver
21 Notch
22 Wire members
23 legs
25 Folding part
25a Locking claw
26 Standing piece
27 Connecting member
28 Fitting protrusion
29 contacts
30 Fixed contact
31 Movable contact part
33 Movable piece
35
40 Switch case
50 plunger

Claims (4)

A contact portion drive mechanism is disposed in the switch case, and a pair of movable pieces are disposed on both sides of the contact portion drive mechanism. One end portion of each movable piece is separated from the fixed contact portion. The other end is swingably provided on the switch case and cantilevered,
The contact portion drive mechanism includes an engagement 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 in a substantially U shape. The part engages with the engaging member, and both leg parts are disposed between the leg part of the wire member attached to the switch case, and one end part engages with the bent part of the wire member. And having a movable spring that engages with a connecting member that connects the other ends of the movable pieces to each other.
When the engaging member is pushed in via the plunger, the movable spring is reversed in the pushing direction, and the movable contact portion is moved in the direction of the fixed contact portion via the connecting member and the movable piece. Configured to be in a switch-on state in contact with
When the engaging member is further pushed through the plunger, the wire member comes into contact with the switch case and moves relative to the engaging member to disengage from the engaging portion. The movable contact portion is configured to be in a switch-off state separated from the fixed contact portion,
When the pushing force of the engaging member is released from this state, the wire member moves relative to the engaging member by the return movement of the engaging member by the biasing force, and can be engaged with the original engaging position .
Furthermore, the switch case inner surface is formed in a cylindrical shape, and a pair of support pieces for cantilevering the movable piece is formed on the switch case. The pair of support pieces, the movable contact portion, and the fixed contact An enable switch characterized in that a pair of contact portions constituted by a portion are arranged so as to form a quadrangle at the center of the switch case . Characterized in that the tip portion of the engaging member, extends in said switch case center side, it is brought into contact with the extending portion in the plunger, to form a pressure receiving portion for receiving the push to inclusive force of the plunger enable switch of claim 1 Symbol mounting and. From the other end of the movable piece, enabling switch according to claim 1 or 2, wherein a portion of the plunger projecting from the projecting piece for breaking freely contact portions forcing engagement. The connecting member has a protrusion with which the movable spring is engaged, is located between the other end portions of a pair of movable pieces, is connected to both the other end portions, and is displaced by the reversal of the movable spring. The enable switch according to any one of claims 1 to 3 , wherein a movable piece having a movable contact portion is provided so as to be swingable.

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