JPH0560208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a contact device used in a remote control relay.

[Background technology]

It is equipped with a remote control switch, and is connected to an operating circuit that allows current to flow using a voltage stepped down by a transformer.
Relays that open and close the power supply circuit of a load upon receiving an OFF signal are used to remotely control the load. By using such a relay, you can connect multiple remote control switches to the relay to open and close the load power supply circuit at multiple locations, or collect the relays for multiple loads in one location to open and close the load power supply circuit. It is very convenient because it allows you to do things such as centrally monitor your computer. Furthermore, since a low voltage current flows through the operating circuit, handling of the operating circuit becomes easy and accidents such as electric shocks are eliminated.

Such relays are required to have high sensitivity.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a contact device that can provide a highly sensitive relay.

[Disclosure of the invention]

In order to achieve the above object, the present invention provides a contact device used in a remote control relay, which is equipped with an electromagnetic device serving as a driving means for opening and closing fixed contacts and movable contacts for load circuit control. A rocking body that is stopped and can swing forward and backward and has support parts on both sides of the shaft, a movable body that is pivoted on one side of the rocking body and driven in the forward and reverse directions by the action of an electromagnetic device, and a movable contact at one end. , a movable contact whose center portion is removably supported on the movable body pivoting side of the oscillator so that the center portion and the other end face both supporting portions of the oscillator, a fixed contact facing the movable contact of the movable contact, and a oscillator. A contact pressure spring is disposed on the movable body and biases the side of the movable contact opposite to the movable contact toward the oscillator, and a stopper is provided on the back side of the movable contact, so that the movable body moves forward and the movable contact moves. When the contact is brought into contact with the fixed contact, the contact pressure spring pushes the pivot side support part of the movable contact and urges the movable body to move backward, and when the movable body moves back, both sides of the movable contact are separated from the pivot side. Hit the opposite support and stopper,
The gist of the contact device is such that a contact pressure spring presses the support portion and urges the movable body to move forward. Hereinafter, the present invention will be described in detail based on drawings showing embodiments.

1 to 5 show a relay using one embodiment of the contact device according to the present invention.
As shown in the figure, this relay has a body 1 made of thermosetting resin or the like, and a cover 2 also made of thermosetting resin or the like, both of which are connected to a caulking pin 3.
etc., so that they are fixed to each other. In the center of the body 1, an electromagnet device 4 and an electromagnet device 4 are provided.
A movable body (plunger) 5 is arranged which is driven by.

The electromagnet device 4 includes a coil frame 6 made of an insulating material,
Two permanent magnets 7, L-shaped magnetic yoke 8
and two U-shaped yokes 9, respectively. The coil frame 6 includes a cylindrical coil attachment portion 6a and four support portions 6 provided on both ends of the attachment portion 6a.
have b. A mounting piece 6c protrudes upward from the upper end of each support portion 6b, and holes 6d are provided in the two support portions 6b, 6b provided on both sides of the front end of the mounting portion 6a.
A pin fixing piece 6e with a pin protrudes forward. A conductive wire is wound around the mounting portion 6a to form a coil 10. Magnetic yokes 8, 8 are arranged on both sides of the coil 10 with the hooks facing backward, and permanent magnets 7, 8 are arranged on the outside of both magnetic yokes 8, 8.
7 is placed. And both permanent magnets 7,7
On the outside of the
0, magnetic yokes 8, 8, permanent magnets 7, 7 sandwiched between both yokes 9, 9 supporting portion 6b...
is fixed. The yoke 9 has a core made of a magnetic material such as cast iron and molded with resin.

The movable body 5 has armatures 11a and 11b fixed to both sides, and a shaft hole 5a in the front part. This movable body 5 is arranged such that the middle part is inserted into the mounting part 6a of the coil frame, and both armatures 11a and 11b are inserted into the space created by the front and rear ends of the mounting part 6a and the front and rear ends of both yokes 9, 9. It is arranged so that it can be moved forward and backward. In the figure, 46 is a residual plate used to provide a residual gap.

A support plate 12 is arranged above the electromagnetic device 4 . This support plate 12 has two notches 12a provided on both sides, into which mounting pieces 6c of the coil frame are inserted, and the mounting pieces 6c and notches 12a are inserted as needed.
are integrally fixed to the electromagnet device 4 by adhesion, welding, or ultrasonic welding. Wall portions 12b and 1 are provided at the front and rear portions of the support plate 12.
2c, a printed circuit board 13 is fixed to the back side of the wall portion 12c, and terminal boards 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, 17b, and capacitor 18 are fixed. Then, two contact plates 19a and 1 are fixed to the support plate 12 by press-fitting, caulking, etc.
9b and each base of the support plate 20a of the contact spring portion 20 penetrate the wall portion 12b of the support plate 12 and are connected to the printed circuit board 13 by soldering or the like. Both contact plates 19a, 19b are arranged with a gap between them, and fixed contacts 21, 21 are provided on the outer surfaces of both. Two contact springs 20b, 20c are fixed to the tip of the support plate a of the contact spring part, with the contact plates 19a, 19b in between, and a movable contact 22 is attached to the inner surface of both contact springs 20b, 20c. It is provided. The contact springs 20b and 20c connect the respective contacts 22... to the contact plates 19a and 19a facing each other.
It is biased so as to press against the fixed contacts 21, 21 of 19b. A presser plate 24 is fixed to each of the terminal plates 14 and 15 by a presser 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 connected to the contact spring section 20. Contact plate 19a is connected to terminal plate 15 via diode 16a, contact plate 19b is connected to terminal plate 15 via diode 16b, and both contact plates 19a, 19b are connected to each other via capacitor 18 and resistor 17a. Then, a resistor 1 is connected in parallel with the capacitor 18.
7b is connected. Contact plates 19a, 19b,
The contact spring portion 20, diodes 16a, 16b, capacitor 18, resistors 17a, 17b, and printed circuit board 13 constitute an auxiliary contact mechanism.
It forms a protection circuit that absorbs surge voltage and prevents malfunction of the relay. The terminal boards 14 and 15 are equipped with a remote control switch 61 and a transformer 62.
Accordingly, an operating circuit 63 is connected, which allows current to flow at a voltage that is normally stepped down to 24V. A rocking body 25 is arranged on the side of the electromagnet device 4. The swinging body 25 has a manual operation section 2 at its upper end.
6. Each has an actuator portion 27 protruding inwardly on a surface facing inward slightly below the actuator portion 27, a shaft hole 28 in the intermediate portion, and a recess 29 having a downward opening 29a on the surface facing outward. We are prepared. A U-shaped groove 30 having a shaft hole is provided on the inner surface of the lower end, and a protrusion 31 is provided on the outer surface. A support portion 32 consisting of a round protrusion is provided on the upper part of the inner wall surface of the inner wall of the recess 29, and support portions 33 consisting of a low protrusion are provided on both sides of the protrusion 31, respectively. That is, both support parts 32, 33
are provided on both sides of the shaft hole 28. Further, a pressing portion (forced separation portion) 25a is provided at the outer end of the opening 29a of the recess 29.

The oscillating body 25 is arranged such that the shaft hole 28 is sandwiched between both shaft holes 6d, 6d of the coil frame 6, and the pin 3 is inserted between these holes.
4 is passed through, and is fixed to the coil frame 6 so as to be able to swing forward and backward. The tip of the movable body 5 and the groove 30
The pin 35 is inserted into the shaft hole 5a of the movable body 5 and the shaft hole of the groove 30, so that the movable body 5 is pivotally fixed to the rocking body 25. By moving the movable body 5 forward and backward, the rocking body 25 can be rocked 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 parts 32 and 33, and this contact pressure spring 36 is inserted through the opening 29a. The base of the plate-shaped movable contact 37 is pushed in the direction of the oscillator (inward). The movable contactor 37 has a hole 37a in the center, a movable contact 38 and a movable electromagnetic iron piece 39 at the lower end, the protrusion 31 of the oscillator 25 is inserted into the hole 37a, and the back side of the upper end is connected to the support part 32.
The intermediate portions are detachably supported by the rocking body 25 so that the back sides of the intermediate portions face the support portions 33, respectively. When the tip of the movable contact 37 is pushed inward, it comes into contact with a stopper 1b provided inside the body 1 at a position on the back side of the movable contact 38. A manual operating section 26 of the rocking body is visible through a notch 1a provided in the wall of the body 1.

Terminals 41 and 42 are fixed to the outside of the rocking body 25 with a partition wall 40 in between, and both terminals 4
1 and 42, each of which has a clamping screw 23 on its upper end surface.
The press plate 24 is fixed by. terminal 41
has a U-shaped portion 41a at its lower end;
A fixed contact 43 is fixed to the outer surface of the tip of the letter-shaped portion 41a. The fixed contact 43 faces the contact 38 of the movable contact 37. This fixed contact 43
The rocking body 25, movable body 5, rotary contact 37, contact pressure spring 36 and stopper 1b which have already been explained are as follows.
It constitutes a contact 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. The terminals 41, 42 and the movable contact 37 constitute a main contact mechanism for controlling the load circuit in the contact device.

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

This relay operates as follows.

The states shown in FIGS. 2, 4, and 6 are states in which the main contact mechanism is turned off. In this state, both the armatures 11a and 11b are not excited, and the movable piece 5 moves back, so that both ends of the armature 11a are connected to the magnetic yokes 8, 8, which are excited to the north pole by the permanent magnet 7. Both ends of the armature 11b are attracted to the rear end of the yoke 9, which is magnetized to the S pole by the permanent magnet 7. As shown by curve A in FIG. 8, the attraction force by the permanent magnet 7 increases in the ON direction as the movable piece 5 approaches the ON position, and increases in the OFF direction as the movable piece 5 approaches the OFF position. The rocking body 25 is in a state in which the lower end is pulled by the movable body 5 and retreats, and the upper end moves forward. The support part 32 protrudes ahead of the support part 33, and the movable contact 37, which is urged backward by the contact pressure bar 36, has an upper end that is connected to the support part 33.
2, and the lower end is pressed against the stopper 1b. Therefore, the contact pressure spring 36 rotates the movable contact 37 using the stopper 1b as a fulcrum, and urges the support portion 32 to push the movable piece 5 forward.

That is, the movable contact 37 constitutes a lever mechanism in which the point of contact with the stopper 1b is the fulcrum, the point of contact with the contact pressure spring 36 is the point of action, and the point of contact with the support portion 32 of the rocking body 25 is the point of force. ing. In this lever mechanism, the urging force of the contact pressure spring 36 causes the rocking body 25 to
The supporting portion 32 of is pressed in the backward direction. Here, the backward traversal means the direction in which the movable body retracts toward the coil, and the direction in which the movable body projects from the coil is called the forward direction.

The oscillating body 25 has a shaft hole 2 in which the point of contact with the movable contactor 37, that is, the support portion 32 is the point of effort and the center of rotation.
8 or the pin 34 constitutes a fulcrum, and the pin 35, which serves as a pivot point for the movable body 5, constitutes a lever mechanism as a point of action. In this lever mechanism, the force received from the swinging body 25 transmits a force in the forward direction to the rotating body 5.

Note that the contact pressure spring 36 has one end connected to the movable contact 37.
At the same time, since the other end is in contact with the rocking body 25, the biasing force of the contact pressure spring 36 also applies a force in the forward direction to the point of contact with the rocking body 25. However, the force applied here also acts on the center of rotation of the rocking body 25 to generate a moment force in the clockwise direction in the figure, which acts on the movable body 5 in the forward direction. However, the magnitude of this moment force is determined by
The force applied to the support portion 32 of No. 5 is smaller than the force applied to the support portion 32 of No. 5.

The load exerted by the contact pressure spring 36 when the movable piece 5 is in the vicinity of the OFF position is as shown by the polygonal line B in FIG. In the OFF position, the attractive force by the permanent magnet is greater than the load by the contact pressure spring 36, so the movable body 5 remains in the OFF position. The actuator section 27 pushes up the tip of the contact spring 20b and pushes up the contact 2 of the contact spring 20b.
2, 22 and the contact 21 of the contact plate 19a are separated 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.

In the above state, when an ON signal current in the direction of arrow C shown in FIG. 6 is passed from the operation circuit to the relay circuit, this current flows through the terminal plate 15, the diode 16b, the contact plate 19b, It flows through the contact spring section 20, the coil 10, and the terminal plate 14. Then, the coil 10 has the armature 11a set to the N pole and the armature 11b set to the S
Excite each pole. As a result, the armature 11a
The magnetic flux between the front ends of the yokes 9 and 9 and between the armature 11b and the rear ends of the magnetic yokes 8 and 8 increases,
The magnetic flux between the armature 11a and the front ends of the magnetic yokes 8, 8 and between the armature 11b and the rear ends of the yokes 9, 9 decreases, and depending on the position of the movable body, the magnetic force as shown in D in FIG. A suction force is generated. As a result, the force that moves the movable body 5 forward increases, and due to the total force of the magnetic attraction force and the spring driving force,
The movable body 5 moves forward. Since the contact pressure spring 36 urges the movable body 5 to move forward in the OFF state, the ON signal current voltage (operating voltage) flowing through the coil 5 can be low. Also, as explained later,
Since the OFF current voltage flowing through the coil 5 also needs to be low, it becomes possible to lower the ON and OFF signal current voltages and improve the sensitivity of the relay. On the other hand, in cases where there is no stopper that can be applied to the tip of the movable contact 37 when the movable body 5
If no load is applied to move it forward, the operating voltage must be increased, which reduces sensitivity. That is, in this relay, the movable contact 3 in the body 1
A stopper 1b is provided on the back side of 7,
If this is not provided, the suction force curve must be, for example, as shown by the dashed line in the figure. However, as mentioned above, the position of the movable contact 37 when OFF is the position held by the stopper 1b, so at this time, the suction force when ON is small as shown by curve D in the figure. I'll try it. Therefore, the operating voltage can be reduced.

When the movable body 5 moves forward, the swinging body 25 rotates so that its upper end moves backward and its lower end moves forward, as shown in FIG. Then, the support part 33 presses the middle part of the movable contact 37, and the contact 38 of the movable contact 37 is pressed against the contact 43 of the terminal 41, thereby closing the main contact mechanism. A little later, the actuator section 27, which has been lowered by the rotation of the movable body 25, pushes down onto the tip of the contact spring 20c, separating the contacts 21 of the contact plate 19b and the contacts 22, 22 of the contact spring 20c. During this time, the tip of the contact spring 20b that had been pushed up by the actuator section 27 is lowered, and the contacts 22, 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 through the electromagnet device is changed. Can be switched. Therefore, after the main contact mechanism is closed, the ON signal current is cut off with a slight delay. As explained later, in this relay, even after the OFF signal current flows and the main contact mechanism opens, the OFF signal current is cut off after a short delay. In this way, if the auxiliary contact mechanism is used to instantaneously excite the coil 10, less power is consumed, and since the coil 10 only needs to be of instantaneous rating, it can be smaller and the relay The whole can be made smaller. Moreover, the number of burnout accidents of the coil 10 is reduced.

While the movable body 5 is moving forward, as shown in FIG. The movable body 5 is no longer urged in either direction of retreat. However, when the movable piece 5 moves forward to the ON position as shown in FIG.
, the support part 32 separates from the movable contact 37, and the contact pressure spring 36 uses the contact 43 as a fulcrum to bias the movable contact 37 backward, and as a result, the movable body 5 is biased to retreat. I come to do it.

That is, the movable contact 37 constitutes a lever mechanism in which the point of contact with the fixed contact 43 is the fulcrum, the point of contact with the contact pressure spring 36 is the point of action, and the point of contact with the support portion 33 of the oscillator 25 is the point of force. Therefore, the biasing force of the contact pressure spring 36 is increased, and a force is transmitted in the direction of moving the movable body 5 backward.

Note that the swinging body 2 is opened from the opposite end of the contact pressure spring 36.
The moment of the force transmitted to the movable body 5 causes the swinging body 25 to rotate in the direction of moving the movable body 5 forward, but this moment force is smaller than the force applied to the support portion 33, so as a whole, A force is generated that causes the movable body 5 to retreat.

Further, the contact pressure spring 36 presses the contact 38 of the movable contactor 37 against the contact 43 using the support portion 33 as a fulcrum, so that the contact 38 is strongly pressed against the contact 43.

When the movable body 5 is near the ON position, the load applied to the contact pressure spring 36 in the direction of retracting the movable body 5 is:
This 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 in the opposite direction due to the contact pressure spring 36. Therefore, the movable body 5 overcomes the load of the contact pressure spring 36 and moves forward to the ON position. Further, even if the ON signal current is cut off, the movable body 5 is held in the ON position because the attraction force in the ON direction by the permanent magnet is greater than the load by the contact pressure spring 36.

As shown in FIGS. 1, 5, and 7, when the main contact mechanism is closed, the seventh
As shown in the figure, when an OFF signal current flows in the opposite direction to the ON signal current, this current flows through the terminal board 1.
4, coil 10, contact spring part 20, contact plate 19
a, the diode 16a, and the terminal plate 15. Then, as shown in FIG.
1a is excited to the south pole and armature 11b is excited to the north pole, and an attractive force as shown by 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 retreats due to the total force of the attractive force due to the magnetic force and the spring driving force. Since the contact pressure spring urges the movable body 5 to retreat during the ON state, the OFF signal current voltage applied to the coil 5 can also be low.

When the movable body 5 retreats, the swinging body 25 rotates so that its upper end moves forward and its lower end moves backward, as shown in FIG. Then, the contact pressure spring 36 moves the lower end of the movable contact 37 backward, so that the contact of the movable contact 37 and the contact 43 of the terminal 41 are separated, and the main contact mechanism is opened. A little later, the movable body 2
The actuator part 27 raised by the movement of 5 pushes up the tip of the contact spring 20b, and the contact plate 19b
and the contacts 22, 22 of the contact spring 20b are separated. During this time, the tip of the contact spring 20c that had been pressed down by the actuator section 27 rises, and the contacts 22, 22 of the contact spring 20c and the contact plate 1
The contact point 21 of 9b comes into contact again, and the direction of the current that can flow through the electromagnetic device is switched.
Therefore, after the main contact mechanism is closed, the OFF signal current is cut off with a slight delay.

In the contact device according to the present invention, as described above, the oscillator 25, the movable contact 37, and the contact pressure spring 36
are combined, so even if the contact of the movable contact 37 and the contact 43 of the terminal 41 of the main contact mechanism are welded together when turned on, both contacts 37 and 43 will be automatically and reliably opened when turned off. be able to. This is due to the following reasons.

Conventionally, as shown in FIG. 10, a movable contact 57 is used that is fixed at one end with a support 55 and has a contact 56 at the other end, and the contact 56 of the movable contact 57 and the fixed contact 58 are When welded, as shown by arrow K, the support 55 and contact 58
A separating force is applied from between the contacts 56 and 58 to separate them. However, in this case, the opening force is divided into two parts as shown by arrows L and M, making it difficult to separate the contacts 56 and 58.

On the other hand, in this embodiment, when ON, the contact 38 of the movable contact 37 and the contact 43 of the terminal 41
If the two are welded together, when the OFF operation is performed, the rocking body 25 rotates and both supporting parts 32 and 33 separate from the movable contact 37, so that the movable contact 37 It is independent from both supporting parts 32 and 33. As a result, a force in the direction of arrow N is applied by the contact pressure spring 36 to rotate the movable contact 37 about both contacts 43 and 38. In this case, the force of the contact pressure spring 36 acts to force the welded portion apart, so that the welding separation effect becomes very large. Therefore, both contacts 37 and 43 can be opened and separated automatically and reliably. and,
In the embodiment, since the pressing part 25a is provided on the rocking body, when the movable body 5 retreats and the rocking body 25 further rotates as shown in FIG. 12, the pressing part 25a is movable from the front side. Since it hits the contact 37 and applies an impact force to force the movable contact to open,
When can a high welding and separation effect be obtained? Note that even if the position of the pressing part is not as in the embodiment, such an effect can be obtained as long as it hits the movable contact from the front side when the movable body 5 retreats.

As in the above embodiment, the oscillator 25 is arranged between the electromagnet device 4 and the terminals 41 and 42 of the main contact mechanism, and the vertical axis of the oscillator 25 is sandwiched between the electromagnet device 4 and the movable contact 37. By doing so, the electromagnet device 4 and the main contact mechanism are insulated from each other, so
This reduces the electromagnetic influence between the two and improves the performance of the relay.

The relay can sufficiently handle high capacity loads such as HID (mercury halogen) lamps.

〔Effect of the invention〕

The contact device according to the present invention is a contact device used in a remote control relay that is equipped with a fixed contact for controlling a load circuit and an electromagnetic device serving as a driving means for opening and closing a movable contact, and is fixed to a shaft and swings forward and backward. A rocking body that can move and has support parts on both sides of the shaft, a movable body that is pivoted on one side of the rocking body and is driven in forward and reverse directions by the action of an electromagnetic device, a movable contact at one end, and a central part and the other end. A movable contact whose central part is removably supported on the movable body pivoting side of the movable body so that it faces both supporting parts of the movable body, a fixed contact that faces the movable contact of the movable contact, and a movable contact placed on the movable body. A contact pressure spring that urges the side of the contact opposite to the movable contact toward the oscillator and a stopper provided on the back side of the movable contact are provided, so that the movable body moves forward and brings the movable contact of the movable contact into contact with the fixed contact. When the movable contact is moved back, the contact spring pushes the pivot side support part of the movable contact and urges the movable body to move backward, and when the movable body moves back, both sides of the movable contact come into contact with the support part opposite to the pivot side. At this time, the contact pressure spring presses this support portion and urges the movable body to move forward, making it possible to obtain a highly sensitive relay.

[Brief explanation of the drawing]

FIG. 1a is a partially cutaway plan view of a remote control relay using an embodiment of the contact device according to the present invention, FIG. 1b is a partially cutaway front view of the relay, and FIG. 1c is a left side view of the relay. 2D is a right side view of the same relay, 2D is a top view of the same relay,
Fig. 3 is an exploded perspective view of the same relay, Fig. 4 and Fig. 5 are structural explanatory diagrams of the electromagnet device and movable body of the same relay, and Fig. 6 is a partially cutaway front view of the same relay.
Figure 7 and Figure 7 are explanatory diagrams of the circuit of the same relay and the operating circuit connected to this circuit, Figure 8 is a graph showing the attraction force and load applied to the movable body of the relay, and Figure 9 is a graph of the relay. FIG. 10 is an explanatory diagram of the operation of the rocking body, contact pressure spring, and movable contact; FIG. 10 is an explanatory diagram of the opening and closing operation of the welded contact in the conventional contact device;
12 and 12 are explanatory views of the opening and closing operation of the welded contacts in the embodiment of the contact device according to the present invention. 1b... Stopper, 4... Electromagnetic device, 5...
Movable body, 25... Rocking body, 31... Protrusion, 32,
33... Support part, 36... Contact pressure spring, 37... Movable contact, 37a... Hole, 38... Movable contact, 4
3...Fixed contact.

Claims (1)

[Scope of Claims] 1. A contact device used in a remote control relay equipped with an electromagnetic device serving as a driving means for opening and closing a fixed contact for controlling a load circuit and a movable contact, which is fixed to a shaft and swings forward and backward. A rocking body with supporting parts on both sides of the shaft, a movable body that is pivoted on one side of the rocking body and is driven in forward and reverse directions by the action of an electromagnetic device, a movable contact at one end, and a center part and the other end. A movable contact whose central part is removably supported on the movable body pivot side of the movable body so as to face both supporting parts of the movable body, a fixed contact that faces the movable contact of the movable contact, and a movable contact arranged on the movable body. A contact pressure spring that biases the side opposite to the movable contact of the child toward the oscillator and a stopper provided on the back side of the movable contact are provided, so that the movable body moves forward and brings the movable contact of the movable contact into contact with the fixed contact. Then, the contact pressure spring pushes the pivot side support part of the movable contact and urges the movable body to retreat, and when the movable body moves back, both sides of the movable contact hit the support part and stopper on the opposite side of the pivot side. ,
A contact device in which a contact pressure spring pushes this support part and urges the movable body to move forward. 2. The contact device according to claim 1, wherein the rocking body has a pressing portion that presses the movable contact from the front side to force the movable contact to open when the movable body retreats.