JP2833075B2 - Contact device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a contact device used for a relay such as a remote control relay.

[Prior art] A power factor improving capacitor is used in many devices for power saving of load equipment. However, when such a load is controlled by an electromagnetic relay or the like, a very large inrush current occurs when the load is turned on. Flows. Depending on the rating of the load and the length of the wiring, an inrush current of several hundred A to more than 1,000 A may flow in some cases.

Conventionally, for example, the electromagnetic relay disclosed in JP-A-56-15522 cannot withstand such a large inrush current,
In many cases, a very large electromagnetic relay or electromagnetic contactor is used because the contact points of the contacts are welded in a relatively small number of times.

Generally, the time of the inrush current of the capacitor load is very short, and is about several tens μsec to about 1 msec. The welding occurs because the contact portion is melted by a short-time inrush current flowing when the contact is turned on, and the contact portion is cooled and solidified.

Therefore, in order to improve the welding resistance, as shown in FIG. 16, it is effective means to move from a melted contact point to a non-melted contact point.

[Problem to be Solved by the Invention] FIG. 18 shows a configuration diagram of a conventional contact device, in which a movable contact 15 is fixed to the tip of a leaf spring 14.
Is fixed to the fixed terminal plate 19. FIG. 3A shows the state at the time of contact closing, and FIG. 3B shows the state after the operation is completed. Here, X in FIG. 3A indicates a welded portion, Y in FIG. 3B indicates a welded portion, and Z indicates a contact point.

As shown in FIG. 18, as an effective means for improving the welding resistance of the contact, the contact is moved from a molten contact point to a non-melted contact point. Slides only a very short distance between the contact of the contacts and the development of the final contact pressure. Increasing the contact pressure increases the sliding distance and improves the welding resistance. However, increasing the contact pressure imposes a load on the electromagnet for the electromagnetic relay, and has a limit.

As another conventional example, in a remote control relay (hereinafter referred to as a “remote control relay”), power line control is generally performed. However, if a short circuit accident occurs on the load side of this relay, a short circuit current will flow. . This short-circuit performance is necessary for a remote control relay positioned as a wiring relay.

Generally, a problem with a relay of about several A is that
When a short-circuit current passes, an electromagnetic repulsive force is generated, and the contact pressure is reduced or the contacts are separated, which causes welding and destruction of the contacts.

The present invention has been made in view of the above points, and provides a contact device which aims to improve welding resistance by moving a contact point largely without increasing a contact pressure. is there.

It is another object of the present invention to provide a contact device for preventing a contact from being broken by welding when a short circuit accident occurs.

Means for Solving the Problems In order to achieve the above object, according to the first aspect of the present invention, a fixed terminal plate having a fixed contact, a movable contact opposed to the fixed contact are fixed, and a leaf spring for generating a contact pressure is provided. And a conductive plate protruding from a width of the leaf spring in a direction orthogonal to a longitudinal direction of the leaf spring and provided integrally with a tip of the leaf spring together with the movable contact, and facing the conductive plate. A fixed terminal plate having the fixed contact is provided, and a magnetic material is fixed to a protruding portion of the conductive plate protruding from the width of the leaf spring.

According to a second aspect of the present invention, in the first aspect of the present invention, another magnetic body is fixed to a surface of the fixed terminal plate having the fixed contact opposite to a surface facing the magnetic body, Are made to face each other from both sides of the fixed terminal plate having the fixed contacts in the direction of the protruding portion of the conductive plate.

According to a third aspect of the present invention, in the first or second aspect of the present invention, one end of the flexible conductor is connected to a conductive plate integrally provided at a tip end of the leaf spring so as to reduce the flexibility. The conductor and the leaf spring are connected in parallel, and the other end of the conductor is fixed to a fixed terminal plate to which a base end of the leaf spring is fixed.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the another magnetic body is formed in a substantially U-shape and has a hole formed therein, and is provided on a fixed terminal plate having the fixed contact in the hole. It is characterized in that the protrusions are inserted and fixed by caulking.

According to the first aspect of the present invention, in the contact device comprising: a fixed terminal plate having a fixed contact; and a leaf spring for fixing a movable contact opposed to the fixed contact and generating a contact pressure. A conductive plate projecting from the width of the leaf spring in a direction perpendicular to the direction is integrally provided with the movable contact at the tip of the leaf spring, and a fixed terminal plate having the fixed contact is provided facing the conductive plate. Since the magnetic material is fixed to the projecting portion of the conductive plate projecting beyond the width of the leaf spring, when the contacts are turned on, the elasticity of the leaf spring shifts the contact contact point in the substantially longitudinal direction of the leaf spring, and the magnetic force is increased. A suction force is generated in the body, and as a result, the contact point is shifted in a direction substantially perpendicular to the longitudinal direction of the leaf spring, and the welding resistance of the contact is improved.

Also, when a large inrush current flows, the attraction force of the magnetic body also increases, the conductive plate is more strongly attracted to the fixed terminal plate to increase the contact pressure, and the displacement of the contact point of the contact also increases. The welding resistance is improved.

Furthermore, when a large inrush current flows, the magnetic material can attract the conductive plate to the fixed terminal plate to increase the contact pressure, thereby preventing contact welding and contact breakage.

According to a second aspect of the present invention, in the first aspect of the present invention, another magnetic body is fixed to a surface of the fixed terminal plate having the fixed contact opposite to a surface facing the magnetic body, Are made to face each other in the direction of the protruding portion of the conductive plate from both sides of the fixed terminal plate having the fixed contacts, so that the magnetic material on the conductive plate side and another magnetic material on the fixed terminal plate side are used for the magnetic circuit. With this configuration, a larger suction force can be obtained, and a larger contact pressure can be obtained, thereby further preventing contact welding and contact breakage.

According to a third aspect of the present invention, in the first or second aspect of the present invention, one end of the flexible conductor is connected to a conductive plate integrally provided at a tip end of the leaf spring so as to reduce the flexibility. The conductor of claim 1 and the leaf spring are connected in parallel, and the other end of the conductor is fixed to a fixed terminal plate to which the base end of the leaf spring is fixed. In addition, even if a large inrush current or a large short-circuit current occurs,
A large current is bypassed by the flexible conductor, so that the fusing of the leaf spring can be prevented.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the another magnetic body is formed in a substantially U-shape and has a hole formed therein, and is provided on a fixed terminal plate having the fixed contact in the hole. Since the protrusion is inserted and caulked and fixed, in addition to the effect of the invention of claim 2, accurate positioning of the fixed terminal plate and another magnetic body is performed by caulking and fixing the protrusion and the hole.

Embodiment 1 FIGS. 1 to 3 show a first embodiment of a contact device according to the present invention. Fixed terminal board 19 with fixed contacts 20
And a leaf spring 14 to which the fixed contact 20 and the movable contact 15 opposed to the fixed contact 20 are fixed to generate a contact pressure, and which protrudes from the width of the leaf spring 14 in a direction orthogonal to the longitudinal direction of the leaf spring 14. The fixed conductive plate 16 is fixed to the tip of the leaf spring 14 together with the movable contact 15, and a fixed terminal plate 19 is disposed facing the conductive plate 16, and the fixed terminal plate 19 projects beyond the width of the leaf spring 14 of the conductive plate 16. The conductive plate 16 at the fixed portion 19 and / or the fixed terminal 19.
The magnetic body 1 is fixed at a position corresponding to the portion.

By fixing the magnetic body 1 to the leaf spring 14 in this manner,
The welding resistance between the movable contact 15 and the fixed contact 20 can be improved, and the magnetic body 1 and the fixed terminal plate 19 are disposed opposite to each other, so that a short-circuit current larger than the inrush current can be obtained. When the magnetic material 1 is attracted to the fixed terminal plate 19 side, electromagnetic repulsion can be prevented. Even if a large inrush current or a large short-circuit current flows, the flexible conductive wire 18
By this, the short-circuit current is bypassed, so that the fusing of the leaf spring 14 can be prevented. Therefore, it is possible to obtain a relay that has excellent resistance to welding between contacts and does not break contacts even when a large short-circuit current flows.

Next, the operation state of the contact opening / closing section of the contact device according to the present invention will be described. When a contact is applied to the fixed contact 20 fixed to the fixed terminal plate 19, the tip of the leaf spring 14 is vibrated by the magnetic body 1 and the movable contact 15 moves while slidingly contacting the fixed contact 20. By providing the magnetic body 1 in this manner, the tip of the leaf spring 14 vibrates due to inertia due to the mass of the magnetic body 1, and the contact point moves in a direction orthogonal to the leaf spring 14 and vibrates. . The melting range of the contact surface and the movement trajectory of the contact point are as shown in FIG. 16, and when the welding is performed between the contacts, the sliding distance is included in the melting range a indicated by the dotted line. As a result, the melting range a
The contact point moves from. The point b at the center of the melting range a indicates the contact point at the time of injection, and slides at a portion c extending from the contact point b, and the movable contact 15 vibrates as shown by an arrow d.

That is, when the movable contact 15 is turned on, the vicinity of the contact point b is melted by the rush current. At the same time, the contact point is indicated by the symbol c in FIG.
Then, the contact point vibrates in the vertical direction as shown by the symbol d in FIG. 16 and moves away from the melting range a by the vibration of the magnetic body 1 while sliding.

According to the experiment, the vibration displacement of the magnetic body 1, the rush current waveform, and the contact waveform have a relationship as shown in FIG. 17, and after the rush current flows, the vibration is completed. The amplitude is suppressed. Therefore, after the movable contact 15 is turned on and the contact point is melted, the contact point is moved by the magnetic body 1, so that the welding resistance between the contacts is improved. The condition of the experiment is a case where the diameter of the movable contact 15 is 3 mm and the thickness is 0.4 mm, and about 0.1 gr of the magnetic body 1 is attached below the movable contact 15.

In the present embodiment, the movement of the contact point of the contact is increased as described above, so that the effect of improving the welding resistance is obtained. However, the following effect is further obtained.

FIG. 17 shows the case where the inrush current time is short, but if the inrush current time is long, for example, when the inrush current reaches a peak value when the maximum amplitude of the magnetic body 1 is suppressed, the When the body 1 suppresses the maximum amplitude, a force is applied in a direction to increase the contact pressure, and at this time, the contact pressure increases. Therefore, since the contact resistance is small, the Joule heat is small and the melting at the contact point is small. Also, after the magnetic material 1 has suppressed the maximum amplitude, it starts to oscillate in the opposite direction. At this time, since the force for pulling out the molten portion that has begun to be cooled is strong,
The welding resistance can be improved.

Note that the conductive plate 16 may be protruded above the leaf spring 14 so that the magnetic body 1 is fixed to the portion of the conductive plate 16 above the movable contact 15.

Second Embodiment Next, a second embodiment will be described. As shown in FIG. 4, a leaf spring 14 for generating a contact pressure, a conductive plate 16 for flowing a current,
The movable spring block is formed by caulking the movable contact 15 integrally. Further, a magnetic body 17 such as an iron piece is attached to the lower part of the conductive plate 16 toward the fixed terminal plate 19 to which the fixed contact 20 is fixed.

Now, when a current i flows in the direction of the arrow shown in FIG. 5, a magnetic field φ is generated, and the magnetic body 17 is attracted to the fixed terminal plate 19.
This contact force increases the contact pressure between the contacts 15, 20. Also,
A similar attractive force is generated when a current flows in the opposite direction.

FIG. 6 shows a case where a flat magnetic body 17 is used, and FIG. 7 shows a state of a magnetic field (dotted line in the figure) when a U-shaped magnetic body 17 is used.

Further, as shown in FIG. 8, the magnetic members 17 and 21 may be attached to both the conductive plate 16 and the fixed terminal plate 19 in order to increase the attraction force. The magnetic field (broken line in the figure) at this time is shown in FIG.

FIG. 10 shows a method of attaching the magnetic plate 21 to the fixed terminal plate 19, in which a projection 19a is protruded on the surface of the fixed terminal plate 19,
The magnetic body 21 has a hole 21a in contact therewith. Then, by inserting the projection 19a into the hole 21a and caulking, the magnetic substance 21 is formed.
Are fixed to the fixed terminal board 19. Therefore, the positioning between the fixed terminal plate 19 and the magnetic body 21 can be performed accurately.

Further, by bending the magnetic body 21 so as to surround the fixed terminal plate 19 as shown in FIG. 11, the area of the magnetic body 21 facing the magnetic body 17 attached to the conductive plate 16 can be increased and the attraction force can be improved. .

 By the way, the types of the magnetic bodies 17 and 21 are those in which the magnetic bodies are separately attached (flat plate, U-shape).

Conductive plate 16 and fixed terminal plate made of magnetic material
Use for 19.

 A material having magnetic properties is used as the material of the conductive plate 16.

and so on.

Next, a remote control relay using the present contact device is used, for example, in a supervisory control system, which performs supervisory control by time division multiplex transmission. The system configuration includes a central control device and terminals connected from the central control device via signal lines, and the like. A load is connected to each terminal, and the load is controlled as a monitoring terminal. The switch is connected. Then, a remote control relay is connected to a certain terminal device, and the remote control relay is driven via the terminal device by a transmission signal from the central control device to control the load.

Next, a remote control relay using the present contact device will be described. FIG. 12 is an exploded perspective view of the entire remote control relay, and FIG. 13 is an external perspective view of the remote control relay. A coil block A is disposed at the center of the upper surface of the base 11 made of an insulating material, and a partition wall integrally protruded from the base 11.
A main contact block B is disposed outside the block 12, and an auxiliary contact block C is disposed on the other side. Conductive fixed terminal plate 13
The base of a conductive leaf spring 14 is fixed to the upper end of the base 1, and the fixed terminal plate 13 is inserted through a hole 11 a
It is designed to be placed in one. A movable contact 15 is fixed to one surface of the tip of the leaf spring 14, and a conductive plate 16 is fixed to the other surface. The movable contact 15, leaf spring 14, and conductive plate 16 are fixed in three layers.

That is, the leaf spring 14 and the conductive plate 16 are simultaneously caulked and fixed by the movable contact 15. In addition, a magnetic material is provided below the conductive plate 16.
17 is stuck. And the lower part of the conductive plate 16 and the fixed terminal plate
A flexible conductor 18 is spot-welded and connected to the central portion 13 in parallel with the leaf spring 14. Hole 11 in base 11
A fixed contact 20 facing the movable contact 15 is fixed to the upper end of the conductive fixed terminal plate 19 disposed at b, and a substantially U-shaped magnetic body 21 is provided at the center. . The main contact block B opens and closes a relatively large current.

The auxiliary contact block C arranged on the side opposite to the main contact block B is configured as follows. That is, the fixed contact 23 is fixed to the upper end of the auxiliary terminal plate 22 which is inserted through the hole 11c of the base 11, and the base of the leaf spring 25 in which the movable contact 26 opposite to the fixed contact 23 is fixed to the tip. Is fixed to the upper end of the auxiliary terminal plate 24. And the auxiliary terminal board
24 is arranged to be inserted through the hole 11d of the base 11. The signal current is opened and closed by the auxiliary contact block C.

Next, the coil block A arranged at the center of the upper surface of the base 11 between the main contact block B and the auxiliary contact block C will be described. A rectangular hole 27a is formed in one piece of the yoke 27 bent into an L shape, and a pole piece 28 is formed from both ends of the other piece.
Are erected opposite each other. A substantially T-shaped iron core 29 is inserted through the inside of the coil frame 31, a tip projection 29a is fitted into the hole 27a of the yoke 27 and caulked and fixed, and the iron core 29 is fixed to the yoke 27 by magnetic coupling. You. The end of the iron core 29 is protruded from the coil frame 31, and both side surfaces are magnetic pole surfaces 30. Coil frame 31
A coil 32 is wound around the outer peripheral surface of the coil frame 31. One thick flange portion 33 of the coil frame 31 is connected to the terminal of the coil 32.
Two coil terminals 34 are embedded.

A protrusion 33a is formed on the upper surface of the flange 33, and this protrusion 3a
A circular shaft hole 35 is formed in the upper surface of the opening 3a. The main contact block B and the auxiliary contact block C are arranged on both sides of the coil block A, so that insulation between the blocks B and C is easily ensured.

Movable block D arranged above coil block A
Is composed of a movable frame 36, two amateurs 37, a permanent magnet 38, and the like. A rotating shaft 40 is suspended from one end of a rotating frame 36 made of an insulator, and the rotating shaft 40 is supported by a shaft hole 35 of the coil frame 31 so that the movable frame 36 can rotate. ing.
As shown in FIG. 12, two armatures 37a and 37b sandwiching a permanent magnet 38 are arranged and fixed on the lower surface of the other end of the movable frame 36, and a leaf spring 14 is provided from one side of the movable frame 36. Is formed. This arm that constitutes the guard
In FIG. 41, as shown in FIG. 14, protrusions 42 and 43 are formed with a gap therebetween, and the leaf spring 14 is disposed in a slit 44 between the protrusions 42 and 43.

The slit 44 is open at the lower surface and the side, so that the leaf spring 14 can be easily arranged in the slit 44. Further, a projection 45 is integrally provided on the side opposite to the arm 41, and the projection 45 drives the leaf spring 25 of the auxiliary contact block C.

The base 11 on which the above members are disposed is covered with a box-shaped cover 46 made of an insulating material with a lower surface opening. When the movable block D is disposed on the coil block A, As shown in FIG. 14, the leaf spring 14 of the main contact block B
Is accommodated in the slit 44 of the movable frame 36, and the projection 45 is positioned inside the leaf spring 25 of the auxiliary contact block C. Also,
The armatures 37a and 37b are located between a pair of gaps formed between the pole face 30 of the iron core 29 and the pole piece 28. Thus, the movable block D is disposed above the coil block A to form a polarized electromagnet block. Then, by exciting the coil 32, the inner surface of the
The movable frame 36 is rotated by attracting the magnetic pole surface 30 of the magnetic pole 29 and the magnetic pole piece 28 of the yoke 27 to drive the main contact block B and the auxiliary contact block C.

By the way, the coil 32 has two windings and is connected to the coil terminal 34 as described above. One of the coil terminals 34 is a common terminal 34a, and the other is a set terminal 34b for turning on a main contact and a main contact. Is a reset terminal 34c for turning off the switch.

Now, FIG. 14 shows the non-excited state,
a is attracted to the iron core 29, and the other armature 37b is attracted to the magnetic pole piece 38 by the magnetic flux of the permanent magnet 38, and both contacts 15, 20 of the main contact block B are open. Further, since the movable frame 36 is urged in the counterclockwise direction, the projection 45 of the movable frame 36 elastically contacts the leaf spring 25 of the auxiliary contact block C, and the contacts 23 and 26 are opened. Then, when a voltage is applied to the set terminal 34b and the common terminal 34a, the coil 32 is excited, and one armature 37b is attracted to the magnetic pole surface 30 of the iron core 29, and the other armature 37a is attracted to the magnetic pole piece 28, respectively. 36 is the rotating shaft 40
And turns clockwise about the axis to turn on as shown in FIG.

That is, when the movable frame 36 rotates clockwise, the arm
At 41, the leaf spring 14 of the main contact block B is urged and both contacts 1
5 and 20 are closed, and the projection 45 is separated from the leaf spring 25 and is returned by the return force of the leaf spring 25 itself.
Closes. When a voltage is applied to the reset terminal 34c and the common terminal 34a in the state of FIG. 15, the state returns to the state of FIG. Thus, by the movable block D,
Since the main contact block B and the auxiliary contact block C are driven in conjunction with each other, the state of the main contact block B can be detected from the output of the auxiliary contact block C.

Here, since a flexible 18 is connected in parallel with the leaf spring 14 to the main contact block B of the main contact, when a large current such as a short-circuit current flows, the current is reduced. 14 and the conductor 18 having flexibility, the fusing of the leaf spring 14 is prevented, and the heat generation of the leaf spring 14 can be reduced. Preventing.
When a short-circuit current flows, the conductive plate 16 and the terminal plate 19
Attraction force is generated by the magnetic members 17 and 21 provided at the contact points to prevent electromagnetic repulsion of the contacts. In order to increase the current capacity of the leaf spring 24, the sectional area of the leaf spring 14 itself may be increased, but in this case, the spring load increases,
It becomes difficult to match the movable block D with the attractive force of the electromagnet.

However, in this embodiment, since only the leaf spring 14 having a small cross-sectional area is pressed, the spring load can be made similar to that of the conventional relay. Further, in the present embodiment, the flexible conductor 18 is attached to the conductive plate 16, but the flexible conductor 18 may be directly connected to the back surface of the movable contact 15 or the like.

In the embodiment of the present invention, the main contact is a flexure and the auxiliary contact is a lift-off type. However, the present invention is not limited to this. On the auxiliary contact side, the contacts 23 and 26 are plated with gold or the like to improve reliability.

[Effect of the Invention] The invention according to claim 1 includes a fixed terminal plate having a fixed contact,
In a contact device having a movable contact opposed to the fixed contact and a leaf spring for generating a contact pressure, a conductive plate protruding from a width of the leaf spring in a direction orthogonal to a longitudinal direction of the leaf spring, A fixed terminal plate having the fixed contact is provided integrally with the tip of the leaf spring together with the movable contact, facing the conductive plate, and a magnetic material is provided on a protruding portion of the conductive plate protruding beyond the width of the leaf spring. Is fixed.
Along with the displacement of the contact point in the substantially longitudinal direction of the leaf spring due to the elasticity of the leaf spring, an attractive force is generated in the magnetic body, and as a result, the displacement of the contact point in the direction substantially perpendicular to the longitudinal direction of the leaf spring also occurs. This has the effect of improving the welding resistance of the contacts, especially when a large inrush current flows, the attraction of the magnetic material also increases, and the contact pressure is increased by making the conductive plate more strongly attracted by the fixed terminal plate. Also, the displacement of the contact point becomes larger, the welding resistance of the contact is improved, and when a large inrush current flows, the magnetic material causes the conductive plate to be attracted to the fixed terminal plate to reduce the contact pressure. Therefore, there is an effect that contact welding and contact destruction can be prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, another magnetic body is fixed to a surface of the fixed terminal plate having the fixed contact opposite to a surface facing the magnetic body, Are made to face each other in the direction of the protruding portion of the conductive plate from both sides of the fixed terminal plate having the fixed contacts, so that the magnetic material on the conductive plate side and another magnetic material on the fixed terminal plate side are used for the magnetic circuit. With this arrangement, a larger suction force can be obtained, and a larger contact pressure can be obtained, so that there is an effect that contact welding and contact breakage can be further prevented.

According to a third aspect of the present invention, in the first or second aspect of the present invention, one end of the flexible conductor is connected to a conductive plate integrally provided at a tip end of the leaf spring so as to reduce the flexibility. Since the conductor and the leaf spring are connected in parallel, and the other end of the conductor is fixed to a fixed terminal plate to which the base end of the leaf spring is fixed, the effect of the invention according to claim 1 or 2 is achieved. In addition, even if a large inrush current or a large short-circuit current occurs,
By bypassing a large current by the flexible conductor, there is an effect that the fusing of the leaf spring can be prevented.

According to a fourth aspect of the present invention, in the second aspect of the present invention, in the second aspect of the present invention, the another magnetic body is formed in a substantially U-shape and has a hole formed therein, and the hole has the fixed contact. Since the protrusion protruding from the fixed terminal plate is inserted and caulked and fixed, in addition to the effect of the second aspect of the invention, accurate positioning of the fixed terminal plate and the magnetic body can be achieved by caulking and fixing the protrusion and the hole. There is an effect that can be.

[Brief description of the drawings]

1 is an exploded perspective view of a relay on which a contact block of a contact device according to the present invention is mounted, FIGS. 2 (a) and 2 (b) are a cross-sectional view and a vertical cross-sectional view of the relay, and FIG. FIG. 4 is an exploded perspective view showing a main part of the contact block shown in FIG. 4, FIG. 4 is a perspective view showing another example of the contact device of the above, FIG. 5 is an operation explanatory view of the contact device of the above, and FIG. FIG. 7 is an operation explanatory view when the magnetic body is a U-shape, and FIG. 8 is an operation explanatory view when the magnetic body is attached to both a conductive plate and a fixed terminal plate. 9 is a side view of the above, FIG.
FIG. 10 is an exploded perspective view showing a state in which the magnetic body is attached to a fixed terminal plate, and FIG. 11 is a perspective view showing another example in which the magnetic body is attached to a fixed terminal plate. No.
12 is an exploded perspective view of the entire remote control relay, FIG. 13 is an external perspective view of the entire remote control relay, FIG. 14 is a cross-sectional view showing an off state of the remote control relay, and FIG. 15 is a cross-sectional view showing an on state of the remote control relay. , FIG. 16 is an explanatory diagram of a contact trajectory state of a contact contact portion, FIG. 17 is an explanatory diagram of a vibration displacement of a magnetic body, an inrush current waveform, and a contact waveform, and FIG. 18 is an explanatory diagram of a conventional contact device. It is. 1, 17 and 21 are magnetic materials, 13 and 19 are fixed terminal boards, 14 is a leaf spring, 15
Is a movable contact, 20 is a fixed contact, 16 is a conductive plate, 18 is a flexible conductor, 19a is a protrusion, and 21a is a hole.

Continued on the front page. (72) Inventor Takatoshi Honjo 1-2-1, Nishi 25-jokita, Obihiro-shi, Hokkaido Obihiro Matsushita Electric Works Co., Ltd. (72) Inventor Hideya Kondo 1048 Kazuma Kazuma, Kadoma-shi, Osaka Matsushita Electric Works Inside (72) Inventor Tsunehiro Kitamura 1048 Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. (56) References Shokai Sho 57-31760 (JP, U) Shokai Hei 3-13649 (JP, U) )

Claims (4)

(57) [Claims] 1. A contact device comprising: a fixed terminal plate having a fixed contact; and a leaf spring for fixing a movable contact facing the fixed contact and generating a contact pressure, wherein a direction orthogonal to a longitudinal direction of the leaf spring is provided. A fixed terminal plate having the fixed contact opposed to the conductive plate is provided with a conductive plate protruding from the width of the plate spring together with the movable contact; A magnetic body is fixed to a protruding portion of the conductive plate protruding from the width of the contact plate. 2. A fixed terminal plate having the fixed contacts, another magnetic material is fixed to a surface of the fixed terminal plate opposite to the surface facing the magnetic material, and both ends of the another magnetic material are fixed to the fixed contact. 2. The contact device according to claim 1, wherein said fixed terminal plate is opposed from both sides of said fixed terminal plate in a protruding portion direction of said conductive plate. 3. One end of a flexible conductor is connected to a conductive plate integrally provided at the tip of the leaf spring, and the flexible conductor and the leaf spring are connected in parallel. connection,
The other end of the conductor is fixed to a fixed terminal plate to which a base end of the leaf spring is fixed.
The contact device as described. 4. The another magnetic body is formed in a substantially U-shape and is provided with a hole, and a projection protruding from a fixed terminal plate having the fixed contact is inserted into the hole and fixed by caulking. The contact device according to claim 2, wherein