JPH077633B2 - Contact switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a contact opening / closing device used in a remote control relay.

[Background technology]

It is equipped with a remote control switch and connected to an operating circuit that allows current to flow at a voltage stepped down by a transformer.
A relay that opens and closes the power supply circuit of the load in response to ON and OFF signals from the remote control switch is used for remote control of the load. When such a relay is used, it is possible to connect a plurality of remote control switches to the relay so as to open and close the power supply circuit of the load at a plurality of locations, or collect each relay of a plurality of loads at one location to load the load. It is very convenient because it enables you to perform such things as centralized monitoring. Further, since a low voltage current flows through the operation circuit, the operation circuit can be handled easily, and accidents such as electric shock are eliminated.

The first such remote control relay
The ones shown in Figures 5 to 5 have been developed. As shown in the figure, this relay has a body 1 made of thermosetting resin and the like, and a cover 2 also made of thermosetting resin and the like, and both are fixed to each other by caulking pins 3 and the like. There is. At the center of the body 1, an electromagnet device 4 and a movable body (plunger) 5 driven by the electromagnet device 4 are arranged.

The electromagnet device 4 includes a coil frame 6 made of an insulating material and a permanent magnet 7.
, Two L-shaped magnet yokes 8 and two U-shaped yokes 9, respectively. The coil frame 6 has a tubular coil attachment portion 6a and four support portions 6b provided on both ends of the attachment portion 6a. A mounting piece 6c is projected upward at the upper end of each support portion 6b, and two support portions 6b, 6b provided on both sides of the front end of the mounting portion 6a have a pin fixing piece 6e with a hole 6d forward. It is protruding. A wire is wound around the mounting portion 6a to form a coil.
It is 10. Magnet yokes 8 and 8 are arranged on both sides of the coil 10 so that the hooks are located rearward, and permanent magnets 7 and 7 are arranged outside the magnet yokes 8 and 8. The outer side of both permanent magnets 7 and 7 has the opening facing inward, and the coil 10 and magnet yokes 8 and 8
Both yokes 9 and 9 are fixed to the supporting portions 6b ... so as to sandwich 7 and 7.

The movable body 5 has armatures 11a and 11b fixed on both sides, and a shaft hole 5a is provided in the front portion. The movable body 5 has an intermediate portion inserted into the mounting portion 6a of the coil frame, and both armatures 11a and 11b are inserted into the space formed by the front and rear ends of the mounting portion 6a and the front and rear ends of the two yokes 9, 9. It is located so that it can move forward and backward. In the figure, reference numeral 46 is a residual plate used for providing a residual void.

A support plate 12 is arranged on the electromagnet device 4. This support plate 12 has two notches 12a provided on each side.
The coil frame mounting piece 6c is inserted into the box, and the mounting piece 6c and the notch 12a are integrally fixed to the electromagnet device 4 by adhesion, welding, ultrasonic welding, or the like, if necessary. . The front and rear parts of the support plate 12 have walls 12b and 12c.
Are provided, the printed circuit board 13 is fixed to the back side of the wall portion 12b, and the terminal plates 14 and 15 are fixed to both sides of the wall portion 12c, respectively. The printed circuit board 13 has diodes 16a, 16
b, resistors 17a and 17b, and capacitor 18 are fixed.
Then, it is fixed to the support plate 12 by press fitting or caulking.
Each base of the contact plates 19a, 19b and the support plate 20a of the contact spring part 20 penetrates the wall part 12b of the support 12 and is connected to the printed board 13 by soldering or the like. Both contact plates 19a, 19b are arranged so as to be spaced apart from each other, and fixed contacts 21, 21 are provided on the outer surfaces of both. At the tip of the support plate 20a of the contact spring portion, two contact springs 2 sandwiching the contact plates 19a and 19b are provided.
0b and 20c are fixed, and a movable contact 22 is provided on the inner surface of each of the contact springs 20b and 20c. Contact springs 20b, 20c
Has contact points 22 ...
It is urged to press it against the fixed contacts 21 and 21 of b. A pressing plate 24 is fixed to each of the terminal plates 14 and 15 by a pressing screw 23.

As shown in FIGS. 6 and 7, one end of the coil 10 is electrically connected to the terminal plate 14, and the other end is a contact spring portion.
Connected to 20. The contact plate 19a is connected to the terminal plate 15 via the diode 16a, the contact plate 19b is connected to the terminal plate 15 via the diode 16b, and both contact plates 19a and 19b are the capacitor 18 and the resistor 17a.
Are connected to each other via. And the capacitor 18
A resistor 17b is connected in parallel with. Contact plates 19a, 19b, contact spring portion 20, diodes 16a, 16b, capacitor 18, resistor 17a,
17b and the printed circuit board 13 compose an auxiliary contact mechanism, and the capacitor 18 and the resistors 17a, 17b compose a protection circuit that absorbs surge voltage of the coil 10 and prevents malfunction of the relay. A remote control switch 61 is provided on the terminal boards 14 and 15, and an operating circuit 63 is connected to the terminal circuit 14 so that a current is normally supplied by a transformer 62 at a voltage stepped down to 24V. An oscillating body 25 is arranged on the side of the electromagnet device 4. The oscillating body 25 is provided with a manual operation portion 26 at an upper end thereof, and an actuator portion 27 protruding inwardly on an inwardly facing surface slightly below the shaft, a shaft hole 28 in an intermediate portion, and a downwardly facing surface facing outward. Each of the recesses 29 has an opening 29a. The inner surface of the lower end is provided with a U-shaped groove 30 having a shaft hole, and the outer surface is provided with a protrusion 31. Recess 29
A support portion 32 formed of a projecting portion that is circularly projected is provided on the upper portion of the inner wall surface of the inner wall of the above, and a support portion 33 formed of a low protrusion is provided on both sides of the projection portion 31. That is, both support parts 32, 33
Are provided on both sides of the shaft hole 28. A pressing portion (forced opening portion) 25a is provided at the outer end of the opening 29a of the recess 29.

In the rocking body 25, the shaft hole 28 is sandwiched between both shaft holes 6d, 6d of the coil frame 6, and the pin 34 is passed through these, whereby
It is fixed to the coil frame 6 so as to swing forward and backward. Pin 34
The both ends are inserted in the holes provided in the walls of the body 1 and the cover 2 so as not to shift laterally.
The tip of the movable body 5 is inserted into the groove 30, and the pin 35 is inserted through the shaft hole 5a of the movable body 5 and the shaft hole of the groove 30, whereby the movable body 5 is pivotally fixed to the swing body 25. Then, the swingable body 25 can be swung forward and backward by moving the movable body 5 forward and backward. A contact pressure spring 36 is arranged at a position such that the height position of the inner wall surface of the outer wall of the recess 29 is between the support portions 32 and 33. The contact pressure spring 36 is inserted through the opening 29a. The base of the plate-shaped movable contact 37 is pushed in the swinging body direction (inward direction). The movable contact 37 has a hole 37a at the center, a movable contact 38 and a movable electromagnetic iron piece 39 at the tip, and the hole 37a
The protrusion 31 of the oscillator 25 is inserted into the
Secondly, it is detachably supported by the rocking body 25 so that the back side of the central portion faces the supporting portion 33, respectively. When the movable contactor 37 is pushed inward, the tip of the movable contactor 37 comes into contact with the stopper 1b provided on the inner side of the body 1 on the back side of the movable contact 38. The manual operation portion 26 of the rocking body is looking out through the notch 1a provided in the wall of the body 1.

Terminals 41 and 42 are fixed to the outside of the oscillating body 25 with a partition wall 40 sandwiched therebetween, and a pressing plate 24 is fixed to the upper end surfaces of both terminals 41 and 42 by a pressing screw 23. . The terminal (fixed contact plate) 41 has a U-shaped portion 41a at the lower end, and a fixed contact 43 is fixed to the outer surface of the tip of the U-shaped portion 41a. The fixed contact 43 faces the contact 38 of the movable contact 37. The fixed contact 43 and the oscillating body 25, the movable body 5, the movable contactor 37, the contact spring 36, and the stopper described above.
1b constitutes a contact switching device. A fixed electromagnetic iron piece 44 having a U-shaped portion is fixed to the base of the U-shaped portion 4a such that the U-shaped portion 41a is inserted into the U-shaped portion. The terminal 42 and the base of the movable contact 37 are electrically connected by a braided copper wire 45. Terminals 41, 42 and movable contact 3
Reference numeral 7 constitutes a main contact mechanism for controlling the load circuit.

In the figure, 47 is a buffer spring, 48 is a blind plate, and the buffer spring 47
Is used to press and fix the electromagnet device 4 housed in the body 1, and the blind plate 48 is an additional component storage chamber of the body 1.
It is used to cover the opening 1d of 1c.

This relay operates as follows.

The states shown in FIGS. 2, 4, and 6 show the state in which the main contact mechanism is turned off. In this state, neither of the armatures 11a and 11b is excited, the movable body 5 is retracted, and both ends of the armature 11a are magnetized to the N pole by the permanent magnets 7 of the magnet yokes 8 and 8. The armature 11b is attracted to the front end, and both ends of the armature 11b are attracted to the rear end of the yoke 9 excited by the permanent magnet 7 to the S pole. As shown by the curve A in FIG. 8, the attraction force by the permanent magnet 7 increases in the ON direction as the movable body 5 approaches the ON position, and increases in the OFF direction as the movable body 5 approaches the OFF position. The lower end of the oscillating body 25 is pulled by the movable body 5 and retracts, and the upper end thereof moves forward. Then, the support portion 32 becomes the support portion 33.
The movable contact 37, which protrudes further forward and is urged in the rearward direction by the contact pressure spring 36, has its base pressed against the support 32 and its tip pressed against the stopper 1b. Therefore, the contact pressure spring 36 is connected to the stopper 1b.
The movable contact 37 is rotated around the fulcrum as a fulcrum, and the support 32 is pushed to urge the movable body 5 to move forward. The movable body 5
The load by the contact pressure spring 36 when it is near the OFF position is
It is as shown by the broken line B in FIG. OF
At position F, the attractive force of the permanent magnets causes the contact spring 3
Since the load from 6 is larger, the movable body 5 stays in the OFF position. The actuator portion 27 pushes up the tip of the contact spring 20b and contacts 22, 22 of the contact spring 20b and contact 21 of the contact plate 19a.
I try to separate them from each other. On the other hand, the contact 22 of the contact spring 20c,
22 and the contact 21 of the contact plate 19b remain in contact with each other.

When an ON signal current in the direction of arrow C as shown in FIG. 6 is flown from the operation circuit to the relay circuit in the above-mentioned state, this current is applied to the terminal plate 15, the diode 16b, the contact plate 19b, It flows through the contact spring portion 20, the coil 10, and the terminal plate 14. Then, the coil 10, as shown in FIG.
The armature 11a is excited to the N pole, and the armature 11b is excited to the S pole. As a result, the magnetic flux between the armature 11a and the front ends of the yokes 9 and 9 and between the armature 11b and the rear ends of the magnet yokes 8 and 8 increases, and between the armature 11a and the front ends of the magnet yokes 8 and 8 and the armature 11b. The magnetic flux at the rear ends of the yokes 9 and 9 decreases, and an attractive force due to the magnetic force is generated as shown in D of FIG. 8 depending on the position of the movable body. As a result, the force for moving the movable body 5 forward increases, and the movable body 5 moves forward by the total force of the attraction force by the magnetic force and the spring driving force. Contact spring 3 when turned off
Since 6 urges the movable body 5 to move forward, the ON signal current voltage (operating voltage) flowing through the coil 5 can be low.
Further, as will be described later, the OFF signal current voltage to be passed through the coil 5 can be low, so that the ON / OFF signal current voltage can be lowered to improve the sensitivity of the relay. On the other hand, when there is no stopper applied to the tip of the movable contact 37 at the time of OFF, when the load for advancing the movable body 5 is not applied, it is necessary to increase the operating voltage. If so, the sensitivity is lowered. That is, in this relay, the stopper 1b is provided on the back surface of the movable contact 37 in the body 1. When the stopper 1b is not provided, the suction force curve is shown by a broken line in the figure, for example. You need to be like a curve. However, as described above, since the position of the movable contact 37 at the time of OFF is the position retained by the stopper 1b, at this time, the suction force at the time of ON is small as shown by the curve D in the figure. End Therefore,
It requires less operating voltage.

When the movable body 5 advances, as shown in FIG. 1,
The oscillating body 25 rotates so that the upper end moves backward and the lower end moves forward. Then, the support portion 33 pushes the central portion of the movable contact 37,
The contact 38 of the movable contact 37 is pressed against the contact 43 of the terminal 41 to close the main contact mechanism. A little later than this, the actuator portion 27 that has descended due to the rotation of the oscillating body 25 pushes down the tip of the contact spring 20c, and the contact 21 of the contact plate 19b and the contact of the contact spring 20c.
Release 22,22 and. During this time, the tip of the contact spring 20b pushed up by the actuator portion 27 is lowered, the contacts 22 and 22 of the contact spring 20b and the contact 21 of the contact plate 19a come into contact again, and the direction of the current that can flow to the electromagnet device is changed. Can be switched. Therefore, after closing the main contact mechanism, the ON signal current is cut off after a short delay. As will be described later, in this relay, the OFF signal current is cut off after a short delay even after the OFF signal current is passed to open the main contact mechanism. In this way, using the auxiliary contact mechanism, the coil 10
Is instantaneously excited, it consumes less electric power, and since the coil 10 may have an instantaneous rating, it can be compact, and the entire relay can be miniaturized. Moreover, the accidental damage to the coil 10 is reduced.

While the movable body 5 is moving forward, the supporting portion 32 is retracted.
The movable contact 37 is applied to both of
The contact pressure spring 36 does not bias the movable body 5 in either the forward or backward direction. However, as shown in FIG. 1, when the movable body 5 advances to the ON position, the contact 38 of the movable contact 37 hits the contact 43 of the terminal 41, so that the support portion 32 separates from the movable contact 37. The contact pressure spring 36 urges the movable contact 37 to the rear with the contact point 43 as a fulcrum, and as a result, urges the movable body 5 to retract. Further, since the contact pressure spring 36 presses the contact 38 of the movable contact 37 against the contact 43 with the supporting portion 33 as a fulcrum, the contact 38 is strongly pressed against the contact 43.

The load of the contact pressure spring 36 applied in the direction to retract the movable body 5 when the movable body 5 is in the vicinity of the ON position is as shown by the polygonal line E in FIG. As shown in this figure, the attraction force in the ON direction due to the magnetic force applied to the movable body 5 at the time of ON is larger than the load of the contact pressure spring 36 in the opposite direction. Therefore, the movable body 5 overcomes the load of the contact pressure spring 36 and is turned on.
Advance to the position. Further, even if the ON signal current is cut off, the attraction force in the ON direction by the permanent magnet is larger than the load by the contact pressure spring 36, so that the movable body 5 is held at the ON position.

As shown in FIGS. 1, 5, and 7, when the main contact mechanism is closed, as shown in FIG. 7, an OFF signal in the opposite direction to the ON signal current is supplied. When passing an electric current,
This current is applied to the terminal plate 14, coil 10, contact spring section 20, contact plate 19
It flows with a, the diode 16a, and the terminal board 15. Then, the fifth
As shown in the figure, the armature 11a is excited to the S pole and the armature 11b is excited to the N pole, and the attraction force as shown by the curve F in FIG. 8 is generated depending on the position of the movable body. As a result, the force for retracting the movable body 5 increases, and the movable body 5 retracts due to the total force of the attraction force and the spring driving force due to this magnetic force. Since the contact pressure spring urges the movable body 5 to retract when it is ON, the OFF signal current voltage flowing through the coil 5 can be low.

When the movable body 5 retracts, as shown in FIG.
The oscillating body 25 rotates so that the upper end moves forward and the lower end moves backward. Then, the contact pressure spring 36 retracts the tip of the movable contact 37, so that the contact 38 of the movable contact 37 and the contact 43 of the terminal 41 are separated from each other, and the main contact mechanism is opened. A little later than this, the actuator portion 27 that has been raised by the rotation of the rocking body 25 pushes up the tip of the contact spring 20b and separates the contact 21 of the contact plate 19b and the contacts 22, 22 of the contact spring 20b. During this time, the actuator section
The tip of the contact spring 20c pushed down by 27 rises, the contacts 22 and 22 of the contact spring 20c come into contact with the contact 21 of the contact plate 19b again, and the direction of the current that can flow in the electromagnet device is switched. Therefore, after closing the main contact mechanism, the OFF signal current is cut off with a slight delay.

Since this relay is equipped with the contact switching device as described above, it is possible to reduce the ON / OFF current voltage to improve the sensitivity.

However, the contact switching device has the following problems. That is, as described above, the pin is used as the rotary shaft of the oscillator, and the pin is passed through the axial hole of the coil frame and the axial hole of the oscillator having an inner diameter slightly larger than the diameter of the pin. Since the tolerance between the pin diameter and the shaft hole diameter of the oscillator causes rattling between them, the tolerance between the pin diameter and the coil frame shaft hole also causes rattling between them. Has a large amount of rattling, and the amount of pushing of the movable contact with respect to the fixed contact by the oscillating body is insufficient, resulting in a problem that the contact pressure decreases, a problem that the operating voltage varies, and the like. In order to eliminate the drop in contact pressure, it has been attempted in advance to set the electromagnet stroke to an excessively large size by anticipating a shortage of pushing amount due to the rattling. Since there is an error in the diameter of the relay, the problem that the contact pressure varies greatly among relay products cannot be solved. Further, if the stroke is increased, the operating voltage rises, and the sensitivity decreases.

If the shaft hole of the oscillator is made smaller and the pin is press-fitted into it, there will be no rattling between the oscillator and the pin, but it is difficult to press-in the pin, which makes the relay product difficult. Occurs.

[Object of the Invention]

The present invention has been made to solve this problem, and an object of the present invention is to provide a contact opening / closing device with less rattling of the rocking of the rocking body.

[Disclosure of Invention]

The inventor has conducted repeated research in order to achieve the above object by improving the contact switching device used in the relay. As a result, the present invention has been completed here.

That is, the present invention is used for a contact switchgear for controlling a load circuit and a remote control relay equipped with an electromagnet device that serves as a driving means for opening and closing the contact switchgear, and is capable of swinging forward and backward with a shaft stopped. An oscillating body with supporting parts on both sides of the adjacent shaft, a movable body that is pivotally attached to one side of the oscillating body and is driven in the forward and reverse directions by the action of an electromagnet device, and has a movable contact at the tip part, and the central part and the base part oscillate. A movable contactor whose central portion is detachably supported on the movable body pivotal stop side of the oscillator so as to face both supporting portions of the moving body, a fixed contact facing the movable contact of the movable contactor, and a movable contactor disposed on the oscillator. A contact pressure spring for urging the base side of the movable member toward the oscillating body and a stopper provided on the back side of the movable contact are respectively provided. When the movable body moves forward to bring the movable contact of the movable contactor into contact with the fixed contact, the contact pressure spring Shaking Push the support part on the pivot side of the body to urge the movable body to retract, and when the movable body retracts, the tip of the movable contact contacts the stopper and the base contacts the support on the side opposite to the pivot side, and the contact pressure is applied. A contact opening / closing device in which a spring urges the supporting portion to urge the movable body to move forward, and the shaft stop of the oscillating body is provided in advance on one of the oscillating body and the electromagnet device by integrally providing the shaft. A contact opening / closing device is characterized in that a bearing portion is provided on the other side and the shaft is received by a bearing of the bearing portion.

The present invention will be described in detail below.

The contact opening / closing device according to the present invention also has a fixed contact, an oscillating body, a movable body, a movable contact,
It is provided with a contact pressure spring and a stopper, and is arranged as described above. However, it is different in that the oscillator is axially fixed to the electromagnet device so as to be able to swing forward and backward as follows. That is, as shown in FIG. 9, shafts 65 (only one of which is visible in the figure) are integrally formed with the oscillator 64 on both sides of the oscillator 64. Then, on both sides of the front portion of the coil frame 67 of the electromagnet device 66, a bearing portion 68 projecting forward is provided integrally with the coil frame 67, and the bearing portion 68 is opened upward. A bearing 68a having a U-shaped cutout is provided. The structure after the oscillator 64 and the electromagnet device 66 is the same as the oscillator 25 and the electromagnet device 4 shown in FIGS. 1 to 5. Therefore, common numbers refer to the same things. In the figure, 5 indicates a movable body. Rocker
64 has the shafts 65 on both sides inserted into the bearing 68a of the bearing portion 68,
The coil frame 67 of the electromagnet device is axially fixed so that it can swing forward and backward.

As described above, when the shaft is formed integrally with the oscillator,
Since the rattling between the shaft and the rocking body is eliminated, the rocking rattling of the rocking body is reduced. Therefore, if the contact opening / closing device with the oscillating body axially stopped is used for the relay in this way, the contact pressure is much less likely to drop, the operating voltage becomes stable, and it is necessary to raise it. There will be nothing.

In the example of the shaft stopper of the oscillator shown in FIG. 9, a hole-shaped bearing may be provided in one of the bearing portions. In this case, one shaft of the oscillating body is passed through a hole-shaped bearing, and then the other shaft is inserted into a bearing having a notch opened upward.

Further, the rocking body may be axially stopped in the following manner. As shown in FIG. 10, the movable body 6
A bearing portion 69 (only one of which is seen in the figure) protruding laterally is formed integrally with the oscillating body 64 'on both sides of the 4', and the bearing portion 69 has a downward opening. The bearing 69a is formed by an inverted U-shaped cutout. On the other hand, on both sides of the front part of the coil frame 67 'of the electromagnet device 66', projecting pieces 70 projecting forward are provided integrally with the coil frame 67 ', and inner side surfaces of both projecting pieces 70 are provided. A shaft 71 (only one of which is visible in the drawing) is integrally formed with the projecting piece 70 so that the tips thereof face each other. Again, the structure after the oscillating body 64 'and the electromagnet device 66' is similar to the oscillating body 25 shown in FIGS.
And the same as the electromagnet device 4. The oscillating body 64 'has the shafts 71 inserted into the bearings 69a on both sides, and the coil frame 6 of the electromagnet device is
The shaft is fixed to the 7'so that it can swing forward and backward. In the figure, 5 indicates a movable body.

Even if the oscillating body is axially stopped in this manner, the same effect as that of the example of the axial stop can be obtained.

〔The invention's effect〕

In the contact opening / closing device according to the present invention, since the rocking body is axially fixed as described above, the rattling of the rocking of the rocking body is small.

[Brief description of drawings]

1A is a partially cutaway plan view of the remote control relay, FIG. 1B is a partially cutaway front view of the relay, FIG. 1C is a left side view of the relay, and FIG. The right side view of the relay, FIG. 2A is a plan view of the relay, and FIG.
Is a partially cutaway front view of the relay, FIG. 3 is an exploded perspective view of the relay, FIGS. 4 and 5 are structural explanatory views of an electromagnet device and a movable body of the relay, and FIGS. 6 and 7 are FIG. 8 is an explanatory diagram of a circuit of the relay and an operation circuit connected to the circuit, FIG. 8 is a graph showing a suction force and a load applied to a movable body of the relay, and FIG. 9 is one embodiment of an electromagnet device according to the present invention. FIG. 10 is an explanatory view of an axial stop structure of an oscillator, and FIG. 10 is an explanatory view of an axial stop structure of an oscillator of another embodiment of the electromagnet device according to the present invention. 1b ... stopper, 5 ... movable body, 31 ... projection part, 32,33 ... supporting part, 36 ... contact pressure spring, 37 ... movable contactor, 37a ... hole, 38 ... movable contact, 43 ... fixed contact, 64,64 ′… Oscillator, 65,71… Axis,
66,66 '... Electromagnet device, 68,69 ... Bearing part, 68a, 69a ... Bearing

Claims (3)

[Claims] 1. A contact switching device for controlling a load circuit, and
It is used for a remote control relay equipped with an electromagnet device that serves as a driving means for opening and closing this contact opening / closing device. A movable body that is pivoted and driven in the forward and reverse directions by the action of an electromagnet device, has a movable contact at the tip, and the central part and the base face the support parts of the oscillator. A movable contact that is detachably supported on the stop side, a fixed contact that faces the movable contact of the movable contact, a contact pressure spring and a movable contact that are arranged on the oscillator and that urge the base side of the movable contact toward the oscillator. When the movable body moves forward to bring the movable contact of the movable contactor into contact with the fixed contact, the contact pressure spring pushes the pivot side support portion of the rocking body so that the movable body retracts. Energize and move When retracted, the tip of the movable contact contacts the stopper and the base contacts the support on the side opposite to the pivot side, and the contact pressure spring pushes this support and urges the movable body to move forward. In the opening / closing device, the shaft stop of the oscillating body is provided with a shaft integrally on one of the oscillating body and the electromagnet device in advance, and a bearing portion is provided on the other side, and the shaft is received by a bearing of the bearing portion. Contact switchgear characterized by being operated. 2. A shaft is provided on each side of the oscillator, and two bearing portions are provided on the electromagnet device so as to be spaced apart from each other. The bearing portion has a notch opened upward to insert the shaft. The contact opening / closing device according to claim 1, which is provided with a bearing made of. 3. The electromagnet device is provided with two shafts with the shafts spaced apart and the tips facing each other, and one bearing is provided on each side of the oscillator. The contact opening / closing device according to claim 1, further comprising a bearing having a notch opened to the inside.