JP2000251589A - Opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold an electrode opening position of a movable shaft without providing a stopper near the terminal of the movable shaft that has moved to the electrode opening position. SOLUTION: This opening/closing device has a movable shaft 3 connecting with an electrode 2, a first end 71 abutting to a support member 4 for supporting the movable shaft 3, and a second end 72 abutting to a shaft-length- directional intermediate part of the movable shaft 3, a belleville spring for energizing the movable shaft 3 to an electrode opening position with deflection of the intermediate part 73 between these ends, an actuator for deflecting the belleville spring and moving the movable shaft 3, and a deflection restricting body 10 that abuts to the intermediate part 73 of a spring body 7 and restricts deflection amount of the spring body 7 when the movable shaft 3 moves to the electrode opening position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening and closing device provided with a spring for urging a movable shaft connected to an electrode on a movable side to an open position where the electrode is detached.

[0002]

2. Description of the Related Art FIGS. 9 (a) and 9 (b) show the structure of a conventional switchgear. FIG. 9 (a) shows a state in which the electrodes are in contact, FIG. 9 (b) shows a state in which the electrodes are detached, and FIG. It is a figure showing a spring characteristic. The conventional opening / closing device shown in FIG. 9 is connected to a switch S in which a fixed electrode 1 and a movable electrode 2 are provided in a cylindrical container so as to be able to come into contact with / separate from the electrode 2. A movable shaft 3 capable of moving to an open position where the electrode 2 is separated and a closed position where the electrode 2 comes into contact, a support member 4 supporting the movable shaft 3, and between the support member 4 and the movable shaft 3. Electromagnetic moving means 5 provided to move the movable shaft 3
And the direction of bending is reversed in the moving range of the movable shaft 3 to bias the movable shaft 3 to the open position or the closed position.
And

The electromagnetic moving means 5 is disposed so as to sandwich the electromagnetic repulsion plate 51 at an appropriate distance from a disk-shaped electromagnetic repulsion plate 51 mounted at the middle of the movable shaft 3 in the axial direction.
Opening coil 52 for inducing a current in the electromagnetic repulsion plate 51
And a closing coil 53.
And a closing coil 53 is attached to the support member 4.

[0004] The support member 4 includes a pair of columns 41, 41 facing left and right at appropriate intervals, and these columns 41, 4
1 includes four connecting members 42 to 45 connected at appropriate intervals in the longitudinal direction and a stopper 46, a fixed shaft connected to the electrode 1 is supported by the uppermost connecting member 42, and a middle three The two connecting members 43 to 45 individually support the opening coil 52, the closing coil 53, and the disc spring 6, respectively, and are configured such that the terminal of the movable shaft 3 abuts the lowermost stopper 46. I have.

The disc spring 6 is connected to a connecting member 45 of the supporting member 4.
And a second end contacting a spring receiver 30 provided at an intermediate portion of the movable shaft 3 in the axial length direction. The intermediate portion between these ends is bent. The movable shaft 3 is configured to be biased toward the opening position or the closing position, and is used within the range of the bending amount H in FIG.
In addition, the bias toward the opening position and the closing position is biased toward the opening position by bending in the bending direction to one side beyond the inversion boundary position in the middle of the bending area, thereby inverting. By bending in the bending direction to the other side beyond the boundary position, it is possible to urge toward the closed position.

Next, the opening operation will be described. Fig. 9 (a)
In the state where the electrodes 1 and 2 are in contact with each other and the electrodes are closed as described above, a magnetic field is generated by applying a pulse current to the opening coil 52, and the magnetic field is generated by the magnetic field.
An induced current is generated in the electromagnetic repulsion plate 51 so as to generate a magnetic field in the opposite direction to the magnetic field generated by. The interaction between the magnetic field generated by the opening coil 52 and the magnetic field generated by the electromagnetic repulsion plate 51 causes the electromagnetic repulsion plate 51 to receive an electromagnetic repulsive force with respect to the opening coil 52. Due to the electromagnetic repulsion, the movable shaft 3 and the electrode 2 against which the second end of the disc spring 6 is in contact.
Moves toward the closed position. At this time, the disc spring 6
Means that the amount of flexure changes from the maximum flexure amount (maximum spring load) to the other side in the flexure direction toward the reversal boundary position (spring load zero), the spring load decreases, and the reversal boundary position at which the spring load is zero. When it exceeds, the biasing direction is reversed to one side of the bending direction, and when the opening bending amount is reached, the end of the movable shaft 3 comes into contact with the stopper 46, and the movement is restricted,
The open state of the switch S is maintained.

Next, the closing operation will be described. Fig. 9 (b)
In the state where the electrodes 1 and 2 are separated and the electrodes are open as in the above, a magnetic field is generated by the pulse current flowing through the closing coil 53, and the magnetic field is generated by the magnetic field.
An induced current is generated in the electromagnetic repulsion plate 51 so as to generate a magnetic field in the opposite direction to the magnetic field generated by. The interaction between the magnetic field generated by the closing coil 53 and the magnetic field generated by the electromagnetic repulsion plate 51 causes the electromagnetic repulsion plate 51 to receive an electromagnetic repulsive force with respect to the closing coil 53. Due to the electromagnetic repulsion, the movable shaft 3 and the electrode 2 against which the second end of the disc spring 6 is in contact.
Moves toward the opening position. At this time, the disc spring 6
In the reversal boundary where the amount of flexure changes from the amount of opening flexure to one side in the flexure direction (opening spring load) to the reversal boundary position (spring load is zero), the spring load decreases and the spring load is zero. When the position exceeds the position, the biasing direction is reversed to the other side in the bending direction, and when the maximum bending amount is reached, the switch S
Is closed.

[0008]

However, in the above-described conventional opening / closing device, the stopper 46 which contacts the end of the movable shaft 3 and limits the amount of movement of the movable shaft 3 in the direction of the opening position is provided. Since it is provided, the structure at the position near the terminal of the movable shaft 3 moved to the opening position is restricted.

Further, the movable shaft 3 from which the electrodes 1 and 2 are detached and moved to the opening position is urged by the spring load of the disc spring 6 whose urging direction exceeds the inversion boundary position to one side in the bending direction.
When the terminal of the movable shaft 3 comes into contact with the stopper 46, the movement is stopped. Therefore, when the contact / separation speed (opening / closing speed) of the movable electrode 2 is increased,
The end of the movable shaft 3 moving to the opening position is a stopper 46.
A rebound force is generated on the movable shaft 3 by an impact when the contact is made, and the biasing direction of the disc spring 6 reverses the reversal boundary position to the other side in the bending direction due to the rebound force, leading to failure of opening. In addition, there is a problem that the separation distance of the electrode 2 becomes insufficient and the arc extinguishing performance is adversely affected when the current is cut off. A length between the first and second ends;
In other words, when a disc spring having a relatively large dimensional difference between the inner diameter and the outer diameter is used, when the biasing direction is bent beyond the inversion boundary position to one side in the bending direction, the first and second disc springs are used. There is a problem that buckling occurs at an intermediate portion between the end portions and the life of the disc spring is shortened.

The present invention has been made in view of such circumstances, and when a movable shaft moves to an opening position due to a spring load of a spring body, the movable shaft comes into contact with the spring body to limit the amount of deflection of the spring body. The object of the present invention is to provide an opening / closing device that does not need to provide a stopper at a position near the end of the movable shaft that has moved to the opening position by providing the deflection limiter, and the movable shaft is opened by the spring load of the spring body. When moving to the pole position, a bending limiter that limits the amount of bending of the spring body by sandwiching the middle portion of the spring body from both sides in the bending direction is provided, or the movable shaft is opened by the spring load of the spring body. When moving to the position, by providing a moving energy reduction body that reduces the moving energy of the movable shaft, an opening and closing device that can prevent the movable shaft that has moved to the opening position from rebounding. And the other purpose be subjected.

[0011]

According to a first aspect of the present invention, there is provided an opening / closing device which is connected to an electrode on the movable side of a pair of electrodes capable of contacting / separating from each other, and an open position where the electrode is separated and a closed position where the electrode is contacted. A movable shaft, a first end abutting on a support member on which the movable shaft is supported, and a second end abutting on an axially intermediate portion of the movable shaft. A movable body for urging the movable shaft to the opening position by bending the intermediate portion of the movable member, a moving means for moving the movable shaft by bending the spring body, and moving the movable shaft to the opened position. A flexure restricting member that contacts an intermediate portion of the spring body to restrict a flexure amount of the spring body.

In the opening / closing device according to the second aspect of the present invention, the spring body uses a disc spring, and the deflection limiting member extends from the contact portion of the support member with which the first end contacts to the center of the disc spring. Characterized in that it has a tapered surface.

The opening / closing device according to a third aspect of the present invention is a movable shaft that is connected to an electrode on the movable side of a pair of contactable / separable electrodes and moves to an open position where the movable electrode is detached and a closed position where the movable electrode is in contact. A first end that abuts a support member on which the movable shaft is supported, and a second end that abuts an intermediate portion in the axial direction of the movable shaft, and an intermediate portion between these ends is bent. A spring body for urging the movable shaft to the opening position, and a moving means for bending the spring body to move the movable shaft,
When the movable shaft moves to the opening position, first and second bending limiters are provided to limit the amount of bending of the spring by sandwiching the intermediate portion of the spring from both sides in the bending direction. It is characterized by the following.

In the opening / closing device according to a fourth aspect of the present invention, the spring body uses a disc spring, and at least one of the first and second flexure restrictors is attached outwardly with respect to a sandwiching surface sandwiching the disc spring. It is characterized by comprising a plurality of projections which are urged and can contact the surface in the bending direction of the disc spring.

According to a fifth aspect of the present invention, there is provided an opening / closing device which is connected to a movable electrode of a pair of electrodes capable of contacting / separating from each other and moves to an open position where the movable electrode separates and a closed position where the movable electrode comes into contact. A first end that abuts a support member on which the movable shaft is supported, and a second end that abuts an intermediate portion in the axial direction of the movable shaft, and an intermediate portion between these ends is bent. A spring body for urging the movable shaft to the opening position, and a moving means for bending the spring body to move the movable shaft,
A moving energy reducer for reducing moving energy of the movable shaft when the movable shaft moves to the opening position.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 The present invention will be described below in detail with reference to the drawings showing an embodiment. FIGS. 1A and 1B show the configuration of the first embodiment, in which FIG. 1A is a diagram showing a state where electrodes are in contact, and FIG. 1B is a diagram showing a state where the electrodes are separated. Since the switchgear shown in FIG. 1A is basically the same as the conventional example described above, the same reference numerals are given to the common parts. Electrode 1 on the fixed side and electrode 2 on the movable side
A movable shaft 3 connected to the electrode 2 and capable of moving to an open position where the electrode 2 is detached and a closed position where the electrode 2 is in contact with the switch 2. 3 is provided between the support member 4 and the movable shaft 3 and the direction of bending is reversed in the movement range of the movable shaft 3, and the movable shaft is moved to the open position or the closed position. A movable body (not shown) for moving the movable shaft 3 is provided.

FIG. 2 is a diagram showing the spring characteristics of the spring body.
The spring body 7 has a first end 71 that abuts on the support member 4 on the outer peripheral portion, and a second end 72 that abuts on the axially intermediate portion of the movable shaft 3 on the inner peripheral portion. And these ends 71,
A coned disc spring is used to urge the movable shaft 3 to the opening position or the closing position by bending the intermediate portion 73 between the 72.
The spring body 7 is used within the range of the amount of bending H in FIG. 2 and urges toward the opening position by bending in one direction in the bending direction beyond the inversion boundary position in the middle of the bending area. By being bent to the other side in the bending direction beyond the position, it is configured to be able to urge toward the closed position.

The movable shaft 3 is provided with a spring receiver 8 having an annular abutting portion 81 abutting on the second end 72 of the spring body 7 in the middle in the axial direction.

The spring receiver 8 has a fitting hole 80 at the center portion into which the movable shaft 3 is fitted, and is formed in an annular shape having the abutting portion 81 formed of an annular groove on the outer peripheral portion. .

The support member 4 comprises an annular groove on the inner periphery,
A spring receiver 9 having an annular contact portion 91 that contacts the first end 71 of the spring body 7 is provided. When the movable shaft 3 moves to the opening position, the spring receiver 9 has an annular flexure restricting body 10 that abuts against the intermediate portion 73 of the spring body 7 to restrict the amount of flexure of the spring body 7. It is provided integrally.

The flexure restricting body 10 is provided with an annular tapered surface 10a extending from the contact portion 91 toward the center of the disc spring (spring body 7) and displaced toward the opening position. When the shaft 3 moves to the opening position, the intermediate portion 73 of the spring body 7 comes into contact with the tapered surface 10a to limit the amount of deflection of the spring body 7.

As the moving means, for example, the electromagnetic moving means 5 shown in FIG. 9 is used. Since the configuration and operation of the electromagnetic moving means 5 are as described above, a detailed description thereof will be omitted. In addition to the electromagnetic linear actuator shown in FIG. 9, the moving means may be an electromagnetic linear actuator (not shown) provided with an electromagnet instead of the electromagnetic repulsion plate 51, or a hydraulic or pneumatic linear actuator. An actuator or the like may be used, or a manual operation tool that can move the movable shaft 3 in the axial direction by manual operation may be used. What is necessary is just to be able to move the movable shaft 3 toward one side and the other in the axial direction.

Next, the opening operation will be described. Fig. 1 (a)
When the electrodes 1 and 2 are in contact with each other and the electrodes are closed, the amount of deflection of the spring body 7 in the other direction in the bending direction and the spring load are maximized. In the closed state, when the movable shaft 3 moves toward the open position by the moving means, the spring body 7
The amount of bending changes from the maximum bending amount (maximum spring load) to the other side in the bending direction toward the reversal boundary position (spring load is zero), and the spring load decreases, and the spring load exceeds the zero reversal boundary position. As a result, the biasing direction is reversed to one side in the bending direction, and when the movable shaft 3 reaches the opening position with the amount of opening deflection, the intermediate portion 73 of the spring body 7 comes into contact with the tapered surface 10 a of the deflection limiting body 10. , The movement of the movable shaft 3 is restricted,
The open state of the switch S is maintained. in this way,
A stopper is provided at a position near the end of the movable shaft 3 that has been moved to the open position as in the conventional example in order to limit the amount of bending of the spring body 7 using the bending limiter 10 with which the intermediate portion 73 of the spring body 7 contacts. No need.

Next, the closing operation will be described. Fig. 1 (b)
As described above, when the electrodes 1 and 2 are separated and the electrodes are opened, the amount of bending of the spring body 7 in one bending direction and the spring load are maximized. In this open state, when the movable shaft 3 moves toward the closed position by the moving means, the spring body 7
The deflection amount changes from the opening deflection amount (opening spring load) to one side in the bending direction toward the reversal boundary position (spring load zero), the spring load decreases, and the reversal boundary position where the spring load is zero is changed. When it exceeds, the biasing direction is reversed to the other side in the bending direction, and when the movable shaft 3 reaches the maximum bending amount and reaches the closing position, the electrodes 1 and 2 come into contact with each other, and the movement of the movable shaft 3 is restricted. The closed state of the switch S is maintained.

Embodiment 2 FIGS. 3A and 3B show the configuration of Embodiment 2, wherein FIG. 3A is a view showing a state where electrodes are in contact, and FIG. 3B is a view showing a state where the electrodes are detached. In the second embodiment, when the movable shaft 3 moves to the opening position with the spring receiver 8 in the first embodiment, the movable bearing 3 abuts on the intermediate portion 73 of the spring body 7 together with the flexure restricting body 10. An annular flexure restricting body 11 for limiting the amount of flexure of the spring body 7 by sandwiching the intermediate portion 73 from both sides of the flexure restrictor 10 in the flexure direction is provided integrally. Because it is the same as the form 1 of
The same reference numerals are given to the common components, and the detailed description and operation thereof will be omitted.

The flexure restricting member 11 of the second embodiment extends from the contact portion 81 toward the center of the disc spring (spring 7).
An annular tapered surface 11a displaced toward the closed position is provided, and when the movable shaft 3 is moved to the open position, the tapered surface 11a of the flexure restricting body 11 comes into contact with the intermediate portion 73 of the spring body 7. The amount of deflection of the spring body 7 is limited.

In the second embodiment, when the electrodes 1 and 2 are in contact and closed as shown in FIG.
The movable shaft 3 is moved toward the opening position by the moving means,
After the biasing direction of the spring body 7 is reversed to one side in the bending direction,
When the tapered surface 10a of the deflection limiter 10 and the tapered surface 11a of the deflection limiter 11 gradually begin to sandwich the intermediate portion 73 of the spring body 7 from both sides in the bending direction and the movable shaft 3 reaches the opening position, The portion 73 is entirely sandwiched and abuts on the tapered surfaces 10a and 11a, so that the movement of the movable shaft 3 is restricted. Since the pair of flexure restrictors 10 and 11 sandwich the spring body 7 in this manner, the movable shaft 3 can be stopped at the opening position, and the contact / separation speed (open / close) of the movable electrode 2 can be reduced. Even when the pole speed is increased, the movable shaft 3 that has moved to the opening position can be prevented from rebounding.

As shown in FIG. 3B, when the electrodes 1 and 2 are detached and the movable shaft 3 is moved from the opened state to the closed position, the spring receiver 8 provided on the movable shaft 3 is moved. Since the bending limiter 11 integrated with the support member 4 is separated from the bending limiter 10 on the support member 4 side, the sandwiching of the spring body 7 by the bending limiters 10 and 11 is released. In addition, the tapered surface 11 of the deflection limiter 11
As for a, when the movable shaft 3 moves to the opening position, a slight gap may be formed between the movable shaft 3 and the intermediate portion 73 without abutting on the intermediate portion 73.

Third Embodiment FIG. 4 is a view showing a configuration of a third embodiment in a state in which electrodes are in contact with each other, FIG. 5 is a view showing a state in which the electrodes are partially removed, and FIG. 6 is a view showing a state in which the electrodes are removed. is there. In the third embodiment, a biasing member 11 of the second embodiment is biased outward with respect to a tapered surface (nipping surface) 11a that sandwiches the spring body 7,
It is provided with a plurality of projections 13 which can be brought into contact with the surface of the spring body (disc spring) 7 in the bending direction, and other configurations and operations are the same as those of the first and second embodiments.
The same reference numerals are given to the common components, and the detailed description and operation thereof will be omitted.

In the flexure restricting body 11 of the third embodiment, a plurality of concave portions 12 are provided on the tapered surface 11a (sandwich surface) at appropriate intervals in the circumferential direction, and pins are used in these concave portions 12. The elastic body 14 is formed by using a coil spring for urging the base 13 of the projection 13 and the projection 13 outward of the recess 12.
3, the protrusions 13 contact the intermediate portion 73 of the spring body 7 before the deflection limiter 11 contacts the intermediate portion 73 of the spring body 7, The flexure restricting member 11 comes into contact with the intermediate portion 73 of the spring body 7 while flexing the elastic bodies 14.

In the third embodiment, when the electrodes 1 and 2 are in contact and closed as shown in FIG. 4, the movable shaft 3 is moved toward the open position by the moving means, When the urging direction of the body 7 is reversed to one side in the bending direction, the protrusions 13 are formed at the intermediate portion 73 of the spring body 7 as shown in FIG.
, And in this state, the spring body 7 bends to one side in the bending direction. Due to the bending of the spring body 7, the force applied to the projections 13 increases, and the projections 13 move into the concave portions 12 against the urging force of the elastic bodies 14, and the tapered surfaces 10a and The tapered surface 11a of the flexure restricting body 11 gradually begins to clamp the intermediate portion 73 of the spring body 7 from both sides in the bending direction, and when the movable shaft 3 reaches the opening position, the intermediate portion 73 is entirely sandwiched. The tapered surfaces 10a, 11a
And the movement of the movable shaft 3 is restricted.

As described above, while the projections 13 move against the urging force of the elastic members 14, the surfaces in the bending direction of the spring body 7 become tapered surfaces (pinching surfaces) 10 a, 11 of the bending limiters 10, 11.
Therefore, even when a disc spring having a relatively large dimensional difference between the inner diameter and the outer diameter is used, buckling occurs at the intermediate portion 73 of the disc spring (spring body 7). Can be prevented.

In the third embodiment, the protrusion 13
Are provided on the tapered surface (sandwich surface) 11a of the deflection limiter 11 instead of the tapered surface (sandwich surface) 10a of the deflection limiter 10.
a, or may be provided on the tapered surfaces (pinching surfaces) 10a, 11a of the flexure restrictors 10, 11.

Fourth Embodiment FIG. 7 is a view showing a structure of a fourth embodiment in a state where electrodes are in contact with each other, and FIG. 8 is a view showing a state in which the electrodes are detached. In the fourth embodiment, the support member 4 in the first to third embodiments is provided with a moving energy reducing body 15 for reducing the moving energy of the movable shaft 3 when the movable shaft 3 moves to the opening position. Other configurations and operations are the same as those of the first to third embodiments.
3, the same reference numerals are given to the common components, and the detailed description and operation thereof will be omitted.

The moving energy reducing member 15 of the fourth embodiment
Is formed by using a disc spring having a through hole through which the movable shaft 3 is inserted at the center. The moving energy reducing body 15 is provided on the support member 4 at an appropriate distance from the bending limiter 10. It is held by a spring holder 16. Also,
A flange 17 is provided at an intermediate portion of the movable shaft 3 in the axial direction at an appropriate distance from the spring receiver 8, and when the movable shaft 3 moves to the opening position, the flange 17 is moved by the moving energy reducing body 15. To move the moving energy reduction body 15
Is stopped at the opening position.

In the fourth embodiment, when the electrodes 1 and 2 are in contact with each other and are closed as shown in FIG. After the biasing direction of the body 7 is reversed to one side in the bending direction, when the movable shaft 3 reaches the opening position, the flange portion 17 comes into contact with the moving energy reducing body 15 and the moving energy of the movable shaft 3 is transferred to the moving energy. Since the reduction body 15 is reduced, the movable shaft 3 that has moved to the opening position can be prevented from rebounding.

In the first to fourth embodiments described above, there is provided the spring body 7 using a disc spring which can be bent in one of the bending directions and the other in the bending direction beyond the inversion boundary position. In addition, a spring body 7 using a disc spring that can bend only from the inversion boundary position to one side in the bending direction without bending to the other side in the bending direction beyond the inversion boundary position is provided. Alternatively, a configuration using a plurality of coil springs instead of the disc springs may be used. In the case of using a configuration using coil springs, for example, three coil springs are used, and these coil springs are held by the spring receivers with substantially the same phase difference in the circumferential direction.

[0038]

As described in detail above, according to the first aspect, the open position of the movable shaft is maintained without providing a stopper near the end of the movable shaft that has been moved to the open position as in the conventional example. Can be.

According to the second aspect of the present invention, since the intermediate portion of the disc spring can be received by the annular tapered surface, the spring load applied to the flexure restricting member can be well dispersed, and the durability of the flexure restricting member can be improved. Can be improved.

According to the third aspect, the intermediate portion of the spring body is the first portion.
And the second bending limiter sandwiches from both sides in the bending direction,
The movable shaft can be stopped at the opening position,
The movable shaft that has moved to the opening position can be prevented from rebounding.

According to the fourth aspect, when the movable shaft moves to the opening position, the plurality of projections abut on the surface in the bending direction of the Belleville spring with the Belleville spring being bent, and these projections resist the urging force. When the disc spring has a relatively large dimensional difference between the inner diameter and the outer diameter, the seat in the middle of the disc spring is used. It is possible to favorably prevent bending from occurring.

According to the fifth aspect of the present invention, since the moving energy of the movable shaft moving to the opening position is reduced by the moving energy reduction body, the movable shaft moved to the opening position is prevented from rebounding. Can be.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment of a switchgear according to the present invention, wherein FIG. 1A is a view showing a state where electrodes are in contact, and FIG. 1B is a view showing a state where the electrodes are detached.

FIG. 2 is a view showing spring characteristics of a spring body.

FIGS. 3A and 3B show a second embodiment of the switchgear according to the present invention, wherein FIG. 3A is a diagram showing a state where electrodes are in contact, and FIG. 3B is a diagram showing a state where the electrodes are detached.

FIG. 4 is a view showing a configuration of a switchgear according to a third embodiment of the present invention in a state where electrodes are in contact with each other.

FIG. 5 is a view showing a configuration of a switchgear according to a third embodiment of the present invention, in a state where electrodes are partially removed.

FIG. 6 is a view showing a configuration of a switchgear according to a third embodiment of the present invention in a state where electrodes are detached.

FIG. 7 is a view showing a configuration of a switchgear according to a fourth embodiment of the present invention, in a state where electrodes are in contact with each other.

FIG. 8 is a view showing a configuration of a switchgear according to a fourth embodiment of the present invention in a state where electrodes are detached.

FIG. 9 shows a configuration of a conventional switchgear, in which (a)
FIG. 4 is a view showing a state where the electrodes are in contact with each other, and FIG.

FIG. 10 is a view showing spring characteristics of a disc spring.

[Explanation of symbols]

1 electrode, 2 electrodes, 3 movable axes, 4 support members, 7
Spring body, 71 first end, 72 second end, 73
Intermediate part, 10 deflection limiting body, 10a taper surface (clamping surface), 11 deflection limiting body, 11a taper surface (clamping surface), 13 protrusion, 15 moving energy reduction body.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiji Morito, Inventor 2-6-1, Otemachi, Chiyoda-ku, Tokyo Mitsui Electric Engineering Co., Ltd. (72) Inventor Hiroyuki Sasao 2-3-2, Marunouchi, Chiyoda-ku, Tokyo No. Mitsubishi Electric Co., Ltd. (72) Inventor Tomoe Takahashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5G028 AA05 AA16 EB08

Claims (5)

[Claims] 1. A movable shaft connected to an electrode on the movable side of a pair of electrodes capable of contacting / separating and moving to an open position where the electrode is detached and a closed position where the electrode is in contact, and the movable shaft is supported. A movable shaft having a first end in contact with a supporting member and a second end in contact with an intermediate portion in the axial direction of the movable shaft. A spring body for urging to the pole position, a moving means for bending the spring body and moving the movable shaft, and contacting an intermediate portion of the spring body when the movable shaft moves to the opening position. An opening / closing device, comprising: a bending limiter configured to limit a bending amount of the spring body. 2. The spring body uses a disc spring, and the deflection limiter has an annular tapered surface extending from the contact portion of the support member with which the first end contacts to the center of the disc spring. The switchgear according to claim 1. 3. A movable shaft connected to an electrode on the movable side of a pair of electrodes capable of contacting / separating and moving to an open position where the electrode is detached and a closed position where the electrode is in contact, and the movable shaft is supported. A movable shaft having a first end in contact with a supporting member and a second end in contact with an intermediate portion in the axial direction of the movable shaft. A spring body for urging to the pole position, a moving means for bending the spring body to move the movable shaft, and when the movable shaft moves to the opening position, the intermediate portion of the spring body is bent on both sides in the bending direction. And a first and a second bending limiter for limiting the amount of bending of the spring body by being sandwiched between the opening and closing devices. 4. A spring body using a disc spring, and at least one of the first and second deflection restrictors is urged outward with respect to a sandwiching surface sandwiching the dish spring, and The opening / closing device according to claim 3, further comprising a plurality of protrusions that can contact the surface in the bending direction. 5. A movable shaft connected to an electrode on the movable side of a pair of electrodes capable of contacting / separating and moving to an open position where the electrode is detached and a closed position where the electrode comes into contact, and the movable shaft is supported. A movable shaft having a first end in contact with a supporting member and a second end in contact with an intermediate portion in the axial direction of the movable shaft. A spring body for urging to a pole position, moving means for bending the spring body to move the movable shaft, and moving energy for reducing the moving energy of the movable shaft when the movable shaft moves to the open position A switchgear comprising: a reducing body.