JP5603183B2 - Mechanical switch - Google Patents

Description

  The present invention relates to a mechanical switch.

  Conventionally, as a switch for opening and closing an electric circuit, various configurations using a short-circuit current flowing through a mechanical contact when the electric circuit is short-circuited have been proposed. When a short-circuit current is passed between mechanical contacts, the current concentrates between the contacts, and the repulsive force acts between the mechanical contacts due to electromagnetic repulsion in the relationship between the current and the magnetic field, causing the contacts to open. There is. That is, the energized state may not be maintained. In addition, due to the opening of the contact, a discharge arc may be generated between the contacts and the contact may be melted. As a result, the mechanical contact may not be reusable.

Therefore, various methods have been proposed in order to prevent this contact opening. For example, as shown in FIGS. 28, 29 (a) and 29 (b), a movable contact 200 constituting a wedge-shaped movable contact is inserted into a fixed contact 100 constituting a sandwich-type fixed contact. Thus, a wedge-type switch that opens and closes an electric circuit has been proposed (Non-Patent Document 1). FIG. 28 is an overall schematic diagram showing an example of this wedge-shaped switch, FIG. 29A is an enlarged cross-sectional view of the main part showing another example of this wedge-shaped switch, and FIG. 29B is a side view of FIG. FIG. The stationary contact 100 includes a support portion 101 and a finger portion 103 as a contact point supported by the support portion 101 via a spring 102. In addition, the movable contact 200 is constituted by a wedge-shaped blade, and the electric path is closed when the tip 201 of the wedge moves in the direction of arrow A and contacts the finger 103. Here, FIG. 28 shows a closed state, and FIGS. 29A and 29B show an open state.
In this configuration, the contact of the fixed contact 100 comes into contact with the movable contact made of a wedge blade at a symmetrical position, and current flows in the symmetrical direction. Electromagnetic repulsion can be reduced.

  Further, as shown in FIG. 30, an electrical relay including a fixed contact 300 including a fixed iron piece 301 and a fixed terminal 302 and a movable contact 400 including a movable iron piece 401 and a movable terminal 402 is also proposed. ing. This electrical relay combines the contact pressure due to the attractive force between the contacts using electromagnetic iron pieces, so that when the contacts are in contact and the current flows, the contact pressure increases due to the attractive force between the contacts, and the contact is released due to the electromagnetic repulsive force. It is configured to prevent.

By Hideo Mori Power Circuit Breaker P222 Denki Shoin

In the configuration of Non-Patent Document 1, a movable contact is inserted into a wedge-shaped fixed contact when driving. For this reason, when the movable contact is inserted into the fixed contact, friction between the movable contact and the fixed contact occurs. For this reason, there has been a problem that a larger driving force is required. Also, contact wear becomes a problem. Further, since the movable contact is inserted into the wedge-shaped fixed contact, the stroke becomes large, so that the drive portion becomes large and it is difficult to reduce the size.
In the configuration of FIG. 30, the fixed iron piece 301 and the movable iron piece 401 made of electromagnetic iron pieces are respectively crimped to the fixed contact (terminal 302) and the movable contact (terminal 402), and the fixed iron piece 301 and the movable iron piece 401 are opposed to each other with high accuracy. It is necessary to let For this reason, since it is necessary to accurately adjust the position of the electromagnetic iron piece and to incorporate the electromagnetic iron piece with high accuracy, the processing is complicated. Furthermore, a large driving force is required to ensure a large contact pressure.

  As described above, a switch for opening and closing an electric circuit needs to ensure resistance to a short circuit current. In general, when a short-circuit current flows between electrical contacts, an electromagnetic repulsion force that opens the contacts works and an arc is generated, which causes welding or fusing of the contacts. Therefore, in the switch of Non-Patent Document 1 and FIG. 30, a configuration for reducing the electromagnetic repulsive force or a configuration for suppressing the electromagnetic repulsive force is constructed as a countermeasure. However, in both of these conventional configurations, in order to suppress the contact opening force due to the short-circuit current, it is necessary to ensure not only the contact contact pressure by mechanical improvement but also a large contact contact pressure. For this reason, a large output is required for the drive unit, and power consumption increases, and at the same time, the drive unit becomes large and it is difficult to reduce the size.

  Furthermore, by opening and closing the contact with a relatively large force, a large noise is caused when the contact is made.

  The present invention has been made in view of the above circumstances, and provides a small and highly reliable mechanical switch capable of reducing the electromagnetic repulsion force in an opening / closing part of an electric circuit in which a short-circuit current can occur. With the goal.

  Therefore, the mechanical switch of the present invention has a fixed terminal provided with a fixed contact, a pair of movable contacts configured to be able to contact the fixed contact across the fixed contact, a pressed portion, and the fixed terminal. And a movable terminal provided with a pair of movable contact springs that constitute a parallel electric path at the time of contact, and a drive part that presses the pressed part, and the drive part presses the pressed part. Thus, the pair of movable contacts are displaced in a direction sandwiching the fixed contact, the movable contact is in contact with the fixed contact, and an opening / closing operation is performed.

  According to the present invention, in the mechanical switch, the movable contact includes a protrusion.

  According to the present invention, in the mechanical switch, the protruding portion has a curved surface.

  According to the present invention, in the mechanical switch, the protrusion has a hollow curved surface.

  According to the present invention, in the mechanical switch, the protrusion has a solid curved surface.

  According to the present invention, in the above-described mechanical switch, the movable contact forms a linear protrusion protruding from the surface of the movable contact spring, and the movable contact is in contact with the fixed contact by a line.

  According to the present invention, in the mechanical switch described above, the movable contact has a plurality of protrusions projected from the surface of the movable contact spring arranged at a predetermined interval, and the movable contact contacts the fixed contact at a plurality of points. It is characterized by.

  According to the present invention, in the mechanical switch, the fixed contact has a tapered surface.

  In the mechanical switch according to the present invention, the fixed terminal has a wedge-shaped tapered surface, and an angle θ formed by the tip surface is an acute angle.

  According to the present invention, in the above mechanical switch, a conductive contact spring connected to a pair of movable contacts is disposed opposite to the fixed terminal and is disposed opposite to each other so as to be parallel when contacted. It includes a parallel electric path composed of a body part.

  According to the present invention, in the above mechanical switch, a conductive contact spring connected to a pair of movable contacts is disposed opposite to the fixed terminal and is disposed opposite to each other so as to be parallel when contacted. It is characterized by comprising a parallel electric circuit composed of body parts and a connecting part for connecting these parallel electric circuits.

  According to the present invention, in the mechanical switch, the movable contact spring includes a parallel electric path and a pair of movable contacts arranged opposite to each other, and the pressed portion is in an operation direction of the pair of movable contacts. On the other hand, it was provided in the extended part extended in the reverse direction.

  According to the present invention, in the mechanical switch described above, the movable contact spring includes a connection portion that connects the parallel electric paths and is integrally formed.

  According to the present invention, in the mechanical switch, the pressed portion is formed narrower than the parallel electric path.

  According to the present invention, in the mechanical switch, the driving unit is in contact with the pressed portions of both of the pair of electric paths, and the fixed contact and the movable contact are in an electrically contact state and a non-contact state. The first contact portion and the second contact portion to be shifted to are configured.

  According to the present invention, in the mechanical switch, the drive unit is capable of rotating the shaft and moving in the axial direction.

  Further, the present invention is characterized in that, in the mechanical switch, the movable terminals are separated and arranged in a plurality of pairs at the tip portion, and constitute an electric circuit in parallel.

According to the present invention, the pair of movable contacts facing each other is driven and the fixed contact is sandwiched and brought into a contact state, so that friction during contact can be reduced.
Moreover, since it has a pair of movable contact springs that constitute a parallel electric circuit at the time of contact, a parallel current in the same direction flows at the time of contact, and an attractive force is generated in the direction in which the two electric circuits are attracted to each other. Working, displacement of the movable contact due to electromagnetic repulsion is suppressed, and the contact state can be maintained.
Accordingly, the force applied by the drive unit can be reduced by reducing the friction at the time of contact and generating the suction force, so that the drive unit can be downsized.

Sectional drawing which shows schematic structure of the mechanical switch which concerns on Embodiment 1 of this invention. The perspective view which shows schematic structure of the mechanical switch which concerns on Embodiment 1 of this invention. The figure which shows the opening / closing operation | movement of the mechanical switch which concerns on Embodiment 1 of this invention. Sectional drawing which shows schematic structure of the mechanical switch which concerns on Embodiment 1 of this invention. The principal part expanded sectional view of the mechanical switch which concerns on Embodiment 2 of this invention. Sectional drawing of the principal part of the mechanical switch which concerns on Embodiment 2 of this invention. A perspective view of a main part of a mechanical switch according to a second embodiment of the present invention. The figure which shows the mechanical switch which concerns on Embodiment 3 of this invention, (a) is sectional drawing of the movable terminal 20, (b) is sectional drawing of the mechanical switch using this movable terminal 20. The perspective view which shows a part of movable terminal 20 of the mechanical switch which concerns on Embodiment 3 of this invention. The figure which shows the mechanical switch which concerns on Embodiment 3 of this invention, (a) is a top view which shows one side of the movable terminal 20, (b) is a side view The perspective view which shows a part of movable terminal 20 of the mechanical switch which concerns on Embodiment 4 of this invention. The figure which shows the mechanical switch which concerns on Embodiment 4 of this invention, (a) is a top view which shows one side of the movable terminal 20, (b) is the side view The principal part expanded sectional view which shows a part of movable terminal 20 of the mechanical switch which concerns on Embodiment 5 of this invention. The principal part expanded sectional view which shows a part of movable terminal 20 of the mechanical switch which concerns on Embodiment 6 of this invention. The principal part expansion perspective view which shows a part of movable terminal 20 of the mechanical switch which concerns on Embodiment 7 of this invention. It is a figure which shows the mechanical switch which concerns on Embodiment 8 of this invention, (a) is sectional drawing which shows a fixed terminal, (b) is principal part explanatory drawing of the switch A perspective view of a mechanical switch according to a ninth embodiment of the present invention. The top view which shows the movable terminal 20 of the mechanical switch which concerns on Embodiment 9 of this invention. The perspective view of the movable terminal 20 of the mechanical switch which concerns on Embodiment 9 of this invention. Sectional explanatory drawing which shows the movable terminal 20 and the fixed terminal 10 of the mechanical switch of Embodiment 9 of this invention. The front view which shows the drive part of the mechanical switch of Embodiment 9 of this invention. The perspective view which shows the drive part of the mechanical switch of Embodiment 9 of this invention. The front view which shows the drive part of the mechanical switch of Embodiment 10 of this invention. The perspective view which shows the drive part of the mechanical switch of Embodiment 10 of this invention. A perspective view of a mechanical switch according to a tenth embodiment of the present invention. A perspective view of a mechanical switch according to an eleventh embodiment of the present invention. The perspective view which shows the movable terminal of the mechanical switch of Embodiment 11 of this invention. Overall schematic diagram showing an example of a conventional wedge-shaped switch (A) is a principal part expanded sectional view which shows the other example of the conventional wedge-shaped switch, (b) is a side view of (a). Perspective view showing a conventional electric relay

  Hereinafter, a mechanical switch according to an embodiment of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1 is a cross-sectional view showing a schematic configuration of a mechanical switch according to Embodiment 1 of the present invention, FIG. 2 is a perspective view, and FIG. 3 is a diagram showing an opening / closing operation of the mechanical switch.

As shown in FIGS. 1 and 2, the mechanical switch according to the embodiment of the present invention includes a pair of movable contacts 22 a and 22 b that are arranged to face the fixed terminal 10 and a parallel electric circuit at the time of contact. The movable terminal 20 including the contact springs 21a and 21b and the drive unit 30 are provided. By pressing the pressed portion of the movable terminal 20, the pair of movable contacts 22a and 22b are displaced in the direction sandwiching the fixed contact 12, so that the movable contacts 22a and 22b are in contact with the fixed contact 12, and the opening / closing operation is performed. Is what you do.
(0023)
As shown in FIGS. 1 and 2, the mechanical switch according to the embodiment of the present invention includes a pair of movable contact springs 21 a and 21 b that are arranged to face the fixed terminal 10 and form a parallel electric path when contacted. The movable terminal 20 and the drive unit 30 are provided. By pressing the pressed portion of the movable terminal 20, the pair of movable contacts 22a and 22b are displaced in the direction sandwiching the fixed contact 12, so that the movable contacts 22a and 22b are in contact with the fixed contact 12, and the opening / closing operation is performed. Is what you do.

The drive unit 30 presses the pressed parts 23 a and 23 b of the movable terminal 20.
Fixed terminal 10 is formed of a wedge-shaped iron plate having a tip angle θ. That is, the fixed contact constitutes a tapered surface. In the above mechanical switch, the fixed terminal forms a wedge-shaped tapered surface, and the angle θ formed by the tip surface is an acute angle.

  The movable terminal 20 is disposed so as to be opposed to the pair of movable contacts 22a and 22b, the pressed portions 23a and 23b, and the fixed terminal 10 configured to be able to contact the fixed contact 12 with the fixed contact 12 interposed therebetween. It includes a pair of movable contact springs 21a and 21b that sometimes constitute parallel electric paths. The movable contact springs 21a and 21b are formed by punching a strip-shaped iron plate having a width of 11 mm, a length of 7 mm, and a thickness of 0.1 to 0.2 mm, and a contact surface with the solid contact has a hemispherical curved surface by extrusion. Movable contacts 22a and 22b are formed. The movable contact has two parallel curved surfaces, and the current i flows along the curved surfaces as shown in FIG. 4B. The movable contact springs 21a and 21b exist from the root portion to the movable contacts 22a and 22b at the tip.

  As described above, in the mechanical switch, the pair of movable contact springs connected to the pair of movable contacts 22 a and 22 b are disposed to face the fixed terminal 10. The movable contact spring includes a parallel electric path composed of conductive parts arranged opposite to each other so as to be parallel when contacted, and a connection portion connecting the parallel electric paths, and constitutes a movable terminal 20. In addition, you may comprise a pair of movable contact spring in which the movable terminal 20 became independent, without having this connection part.

  The drive unit 30 can be driven in parallel, and may have any shape, such as a pressing piece that presses the pressed portion. The pressed portions 23a and 23b are pressed to move the movable contacts 22a and 22b of the movable terminal 20. Any configuration that can contact the fixed contact 12 of the fixed terminal 10 is acceptable.

Next, the operation of this mechanical switch will be described.
As shown in FIG. 3A, by driving the drive unit 30 and pressing the pressed portion, the pair of movable contacts 22a and 22b are displaced in a direction (arrow) A sandwiching the fixed contact 12, and the movable contact 22a. , 22b contacts the fixed contact 12.
At this time, a short-circuit current flows as shown in FIG. 3B, but a parallel electric path is formed because the movable contact springs 21a and 21b are parallel. The movable contact springs 21a and 21b exist from the root portion to the movable contacts 22a and 22b at the tip. For this reason, a current flows in parallel at the time of contact, and a force A1 that attracts the movable contact springs 21a and 21b works, which operates in a direction of increasing the contact pressure as a centripetal force between the contacts. On the other hand, there is also an electromagnetic repulsion force, which is sufficiently smaller than the centripetal force between contacts.

  FIG. 4 is a diagram showing the relationship between the current at the contact portion and the electromagnetic repulsion force. As can be seen from this figure, the force at which the movable contact actually moves away from the fixed contact is Fcos θ with respect to the electromagnetic repulsion force F. Also from this point, it can be seen that when the movable contact forms a curved surface, the force with which the movable contact is separated from the fixed contact becomes smaller. That is, a difference occurs in the vector direction between the electromagnetic repulsive force and the contact pressure, and the contact pressure does not become zero even if the electromagnetic repulsion works.

  Thus, according to the present embodiment, in the current flow path in the vicinity of the contact point contact portion, the orthogonal current flow path that causes electromagnetic repulsion can be reduced, and the electromagnetic repulsive force can be reduced. As a result, the contact pressure can be reduced, and power saving of the drive unit can be achieved.

In addition, since it short-circuits at two points and the electric circuit through which a short circuit current flows becomes two, an electromagnetic repulsion force also becomes a half magnitude | size, respectively.
In this way, it is possible to obtain a highly reliable mechanical switch with a small contact pressure.
Therefore, it is possible to provide a mechanical switch with a small number of parts, low cost, and low power consumption.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.
In the above-described embodiment, the movable contact is constituted by a protruding portion formed by extrusion, that is, a hollow member. However, in this embodiment, the movable contact 22S (22Sa, 22Sb) is solid as shown in FIGS. It is characterized by comprising a member. The rest is the same as in the above embodiment. 5 is a cross-sectional view of the main part of the mechanical switch, FIG. 6 is an enlarged cross-sectional view of the main part, and FIG. 7 is a perspective view of the main part of the mechanical switch.
In this example, as the direction of the current i during energization is indicated by an arrow, a current path that is opposite and parallel is formed between the movable contact and the fixed contact, so that the electromagnetic repulsive force during energization is large. There is a case.
The size and material of the movable contact spring and the fixed contact constituting the movable terminal are the same as those in the first embodiment.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.
In the first and second embodiments, the movable contact is composed of a hemispherical protrusion. However, in the present embodiment, as shown in FIGS. 8 to 10, the movable contact 22L (22La, 22Lb) is a movable contact spring. A linear protrusion protruding from the surface of the wire is formed, and the movable contact is configured to contact the fixed contact 12 with a line.
FIG. 8A is a cross-sectional view of the movable terminal 20, and FIG. 8B is a cross-sectional view of a mechanical switch using the movable terminal 20. 9 is a perspective view showing a part of the movable terminal 20, FIG. 10A is a top view showing one of the movable terminals 20, and FIG. 10B is a side view. In this example, the protrusion is formed by extrusion molding.

According to this configuration, since the contact point can be ensured in a linear shape, the contact resistance during energization can be reduced, and the contact reliability can be improved.
The size and material of the movable contact spring and the fixed contact constituting the movable terminal are the same as those in the first embodiment. Further, although the direction of current in the vicinity of the contact point changes, a solid shape instead of a hollow shape is also applicable.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described.
In the third embodiment, as shown in FIGS. 11 and 12, the movable contact 22D (22Da, 22Db) is constituted by a linear protrusion. However, in the present embodiment, the end surface of the linear protrusion is tapered. A dome-shaped movable contact 22Da (, 22Db) having a surface and an obtuse angle is formed.
11 is a perspective view showing a part of the movable terminal 20, FIG. 12 (a) is a top view showing one of the movable terminals 20, and FIG. 12 (b) is a side view. In this example, the protrusion is formed by extrusion molding.
According to this configuration, by forming the contact point in a dome shape, it is possible to prevent an unequal electric field at the contact end point at the time of opening and closing the load. Can extend the lifespan.
The size and material of the movable contact spring and the fixed contact constituting the movable terminal are the same as those in the first embodiment.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described.
In the first embodiment, the movable contact spring 21 (21a, 21b) and the movable contact 22 (22a, 22b) are integrally formed of the same member. On the other hand, the mechanical switch of the present embodiment is used. Then, it is formed as a separate body. That is, in the present embodiment, as shown in the cross-sectional view of the main part in FIG. 13, the surface treatment of the movable contact spring 21P (21Pa, 21Pb) is made of a material having a higher magnetic modulus than the movable contacts 22a, 22b. Features.
For example, the movable contacts 22a and 22b are formed of a laminated film of a Ti thin film and an Au thin film in order to reduce surface wear and enhance contact.
The movable contact springs 21Pa and 21Pb are made of Fe-Co alloy.
According to this configuration, when the electromagnetic repulsion force is applied, the material can be set so that the attractive force is increased between the movable contact springs 21Pa and 21Pb of the parallel portion. In this way, an attractive force can be generated between the electric paths facing each other when a short-circuit current is applied, and the contact voltage can be reduced, so that power saving of the drive unit can be achieved.
The size and material of the movable contact spring and the fixed contact constituting the movable terminal are the same as those in the first embodiment.

(Embodiment 6)
Next, a sixth embodiment of the present invention will be described.
In the first embodiment, the movable terminal 20 including the pair of movable contact springs 21a and 21b and the movable contacts 22a and 22b is used. However, in the present embodiment, as shown in FIG. It is characterized by comprising one part including the connecting part 24 constituted by a member.
According to this configuration, the number of parts can be reduced, and assembly is easy. Further, since there is no connection portion, reliability can be improved.
The size and material of the movable contact spring and the fixed contact constituting the movable terminal are the same as those in the first embodiment.

(Embodiment 7)
Next, a seventh embodiment of the present invention will be described.
In the third embodiment, the linear protrusion is used as the movable contact. However, in the mechanical switch of the present embodiment, as shown in the perspective view of the main part in FIG. Alternatively, the movable contacts 22F arranged in a line may be used.
According to this configuration, in the movable contact, the plurality of protrusions projected from the surface of the movable contact spring are arranged at a predetermined interval, and the movable contact contacts the fixed contact at a plurality of points. Therefore, the direction of current is specified at each contact point, and a mechanical switch with low electromagnetic repulsion can be provided efficiently. Moreover, since the contact pressure of each contact part can be ensured larger than a linear protrusion, contact reliability can be improved.
Also in the present embodiment, the size and material of the movable contact spring and the fixed contact constituting the movable terminal are the same as those in the first embodiment.

(Embodiment 8)
Next, an eighth embodiment of the present invention will be described.
16A and 16B are diagrams showing a mechanical switch according to an eighth embodiment of the present invention. FIG. 16A is a cross-sectional view showing a fixed terminal, and FIG. 16B is an explanatory view of a main part of the switch.
The mechanical switch of the present embodiment is characterized in that the fixed contact 12 of the fixed terminal 10 forms a tapered surface. In this mechanical switch, the fixed terminal forms a wedge-shaped tapered surface, and the angle θ ₀ formed by the tip surface is an acute angle.
The movable terminal 20 is composed of a pyramidal protrusion having a pointed tip rather than a curved contact point.

Also in the above mechanical switch, the movable contact spring connected to the pair of movable contacts is arranged to face the fixed terminal, and from the conductor portion arranged to face each other so as to be parallel at the time of contact. It is desirable to provide a parallel electric circuit and a connection part for connecting these parallel electric circuits.
However, the shape of the movable terminal can be appropriately changed by forming the wedge-shaped tapered surface with the apex angle θ _{0 by} the fixed terminal.
The driving unit is the same as that of the first embodiment, and may have any shape. When the pressed parts 23a and 23b are pressed, the movable contacts 22a and 22b of the movable terminal 20 become the fixed contacts 12 of the fixed terminal 10. Any configuration that allows contact is acceptable.

(Embodiment 9)
Next, a ninth embodiment of the present invention will be described.
17 to 22 show a mechanical switch according to the ninth embodiment of the present invention. FIG. 17 is a perspective view of the mechanical switch. FIG. 18 is a plan view showing the movable terminal 20 of the mechanical switch, and FIG. 19 is a perspective view of the movable terminal 20. FIG. 20 is a cross-sectional explanatory view showing the movable terminal 20 and the fixed terminal 10 of this mechanical switch. 21 and 22 are a front view and a perspective view showing the drive unit.

  In the mechanical switch of the first embodiment, the pressed parts 25a and 25b (not shown for 25b) of the movable terminal are pressed on the parallel electric circuit of the movable contact springs 21a and 21b constituting the parallel electric circuit. It is composed. On the other hand, in the present embodiment, the pressed parts 25 and 25b are provided not in the parallel electric path but in the extending parts 26a and 26b (26b not shown) extending in the reverse direction. . That is, the movable contact springs 21a and 21b are provided with parallel electric paths arranged opposite to each other and a pair of movable contacts 22a and 22b. And the to-be-pressed parts 25a and 25b are provided in the extension parts 26a and 26b extended in the reverse direction with respect to the operation direction of a pair of movable contact 22a and 22b.

  In the present embodiment, the movable terminal 20 is formed by integrally molding a leaf spring. The movable terminal 20 includes a pair of movable contacts 22 (22a, 22b), a pair of movable contact springs 21 (21a, 21b), and a pressed portion 25 (provided with an extended portion 26 (26a, 26b)). 25a, 25b). Again, the pair of movable contacts 22a and 22b is configured to be able to contact the fixed contact 12 with the fixed contact 12 interposed therebetween. The pair of movable contact springs 21 a and 21 b constitutes a parallel electric path when in contact with the fixed terminal 10. The movable contact springs 21a and 21b are formed by punching a strip-shaped iron plate having a width of 11 mm, a length of 15 mm, and a thickness of 0.1 to 0.2 mm, and a contact surface with the solid contact has a hemispherical curved surface by extrusion. Movable contacts 22a and 22b are formed. The movable contact has two parallel curved surfaces, and current flows along the curved surfaces. The movable contact springs 21a and 21b exist from the root portion to the movable contacts 22a and 22b at the tip.

  The movable contact springs 21a and 21b are integrally formed with a connecting portion 24 that connects the parallel electric paths. The extending portions 26a and 26b are formed to be narrower than the parallel electric circuit, and the pressed portions 25a and 25b provided in the extending portions 26a and 26b are formed to be narrower than the parallel electric circuit.

  Further, as shown in FIGS. 21 and 22, the driving unit 30 contacts the pressed portions 25a and 25b of the pair of electric paths, and the fixed contact 12 and the movable contacts 22a and 22b are brought into an electrically contact state. It has the 1st and 2nd contact parts 31a and 31b made to change to a non-contact state. The front ends of the first and second contact portions 31a and 31b have first and second contact surfaces 32a and 32b that face each other. As shown in FIG. 17, the drive unit 30 moves in the direction of arrow B to displace the movable contacts 22 a and 22 b with respect to the fixed contact 12.

According to this configuration, since the drive unit can be secured outside the electric circuit from the basic connection unit 24 to the movable contacts 22a and 22b, contact reliability can be more reliably ensured. And it is possible to realize further quiet contact opening and closing. That is, the pressed portion is provided in an extending portion extending in the opposite direction to the operation direction of the pair of movable contacts and holds both sides with respect to the movable contact. The movable contact can be displaced stably without any bounce.
Further, since the stroke (displacement amount) of the drive unit from the contact until the contact pressure is ensured can be ensured, the contact reliability can be ensured.
Furthermore, since the pressed part does not constitute an electric circuit, it can be formed narrower than a parallel electric circuit, and a degree of freedom in design can be obtained.

Furthermore, since the extending portions 26a and 26b are formed to be narrow, the spring constant after contact can be reduced, the contact push-in amount can be secured, and contact reliability can be ensured more reliably. can do. Therefore, contact reliability against vibration can be improved.
Moreover, since the drive part which has the 1st and 2nd contact part is used, it can drive with one actuator and it becomes possible to reduce a number of parts.

  In addition, in the said embodiment, although the drive part which has the 1st and 2nd contact part was used, it is not limited to this, It is sufficient to use two contact parts driven independently. Needless to say.

(Embodiment 10)
Next, an embodiment 10 of the invention will be described.
23 to 25 are diagrams showing a mechanical switch according to the tenth embodiment of the present invention. 23 and 24 are a front view and a perspective view showing the drive unit. FIG. 25 is a perspective view of the mechanical switch.

  In the above-described embodiment, the drive unit has moved in parallel, but in this embodiment, the drive unit 30 can be rotated by the shaft 40 and can swing with respect to the shaft 40. When the drive unit 30 rotates, the pressed portions 25a and 25b of the movable terminal 20 are pressed, the movable contacts 22a and 22b are brought into contact with the fixed contact 12, and a short circuit current flows.

  According to this configuration, the drive unit 30 swings the first and second contact portions 31a and 31b, so that the first and second contact portions 31a and 31b have the first and second contact portions 31a and 31b as shown in FIG. The second contact surfaces 32 a and 32 b are in contact with the pressed parts 25 a and 25 b of the movable terminal 20. In this way, the first and second contact portions 31a and 31b are in contact with the pressed portions 25a and 25b of both of the pair of electric paths, and the fixed contact 12 and the movable contacts 22a and 22b are not electrically contacted with each other. Transition to contact state. The drive unit 30 swings in the direction of arrow C as shown in FIG. 25, and displaces the movable contacts 22a and 22b with respect to the fixed contact 12.

  According to this structure, since it can move to an axial direction according to the load distribution of a drive part, the contact pressure applied to a pair of movable contact which is in contact with the fixed contact 12 in between can be equalized. it can. Thereby, the contact reliability can be improved.

(Embodiment 11)
Next, an eleventh embodiment of the present invention will be described.
26 to 27 are diagrams showing a mechanical switch according to an eleventh embodiment of the present invention. FIG. 26 is a perspective view of the mechanical switch, and FIG. 27 is a perspective view showing a movable terminal of the mechanical switch.
In the present embodiment, the movable terminals 20 are separated and arranged in a plurality of pairs at the tip, and constitute an electric circuit in parallel. Other parts are the same as those of the mechanical switch of the tenth embodiment, and the description is omitted here.
With this configuration, multiple movable contacts can contact the fixed contact portion independently, so the relative displacement and inclination of the movable contact and fixed contact portion are absorbed, ensuring a more reliable contact surface. It is possible to ensure contact stability.

  In the above embodiment, the movable contact can be easily formed by performing plating on a desired region of the movable contact spring. In addition, it is possible to easily form the protruding portion by performing selective plating with a mask in a desired region.

  Further, the fixed contact 12 can be easily formed by performing plating on a desired region of the fixed terminal body 11.

As described above, according to the mechanical switch of the present invention, the force applied by the drive unit can be reduced by reducing the friction at the time of contact and generating the suction force. It becomes possible to plan.
Desirably, the movable contact is provided with a protrusion, so that the distance from the movable contact spring body (base) through which a current flows when contacting the fixed contact can be reduced, and electromagnetic repulsion can be reduced. Can do.
Preferably, the projecting portion has a curved surface, and the movable contact contacts the fixed contact with the curved surface, thereby changing the direction of current flow and reducing the electromagnetic repulsive force generated when a short-circuit current occurs. Can do. For this reason, it can drive by the contact with a low contact pressure, and the drive part can be miniaturized.
Desirably, the pressed portion is provided on an extended portion extending in the opposite direction to the operation direction of the pair of movable contacts, thereby holding both sides of the movable contact. Therefore, the movable contact can be stably displaced without bounce.
Furthermore, since the pressed part does not constitute an electric circuit, it can be formed narrower than a parallel electric circuit, and a degree of freedom in design can be obtained.

DESCRIPTION OF SYMBOLS 10 Fixed terminal 11 Fixed terminal main body 12 Fixed contact 20 Movable terminal 21a, 21b Movable contact spring 22a, 22b Movable contact 23a, 23b Pressed part 24 Connection part 25a, 25b Pressed part 26a, 26b Extension part 30 Drive part 40 Axis

Claims (15)

A fixed terminal with a fixed contact;
A pair of movable contacts configured to be able to contact the fixed contacts with the fixed contacts interposed therebetween, a pressed portion, and a pair of electric circuits that are arranged to face the fixed terminals and that are parallel to each other at the time of contact. A movable terminal with a contact spring;
A drive unit that presses the pressed part,
By the drive unit pushes the pressed portion, the pair of movable contacts is displaced in a direction of sandwiching the fixed contact, as the movable contact comes into contact with the fixed contact, have rows opening and closing operations,
First and second contacts in which the driving unit makes contact with the pressed parts of both of the pair of electric paths, and causes the fixed contact and the movable contact to transition electrically between a contact state and a non-contact state. Part
The drive unit is rotatable about an axis extending in a direction in which the pair of movable contacts are opposed to each other, and the first and second contact units are arranged from an axis support unit rotatably held on the axis. A mechanical switch which is formed to be branched so as to face each other, and the contact state between the first and second contact portions and the pressed portion changes as the shaft support portion rotates . The mechanical switch according to claim 1,
The movable contact is a mechanical switch having a protrusion. The mechanical switch according to claim 2,
The protrusion is a mechanical switch having a curved surface. The mechanical switch according to claim 3,
The protrusion is a mechanical switch having a hollow curved surface. The mechanical switch according to claim 3,
The protrusion is a mechanical switch whose curved surface is solid. The mechanical switch according to claim 1 or 2,
The movable switch is a mechanical switch that forms a linear protrusion protruding from the surface of the movable contact spring, and the movable contact is in contact with the fixed contact with a line. The mechanical switch according to claim 1 or 2,
The movable contact is a mechanical switch in which a plurality of protrusions projected from the surface of the movable contact spring are arranged at predetermined intervals, and the movable contact contacts the fixed contact at a plurality of points. The mechanical switch according to any one of claims 1 to 7,
The fixed contact is a mechanical switch that forms a tapered surface. A mechanical switch according to claim 8,
The fixed terminal is a mechanical switch having a wedge-shaped taper surface and an acute angle θ formed by a tip surface. The mechanical switch according to claim 1,
A mechanical switch including a parallel electric path composed of a conductor portion arranged so that a movable contact spring connected to a pair of movable contacts is opposed to the fixed terminal and arranged to be parallel to each other at the time of contact. . The mechanical switch according to claim 1,
A movable contact spring connected to a pair of movable contacts is disposed opposite to the fixed terminal, and includes a parallel electric path composed of conductor parts arranged to face each other so as to be parallel when contacted, and these parallel electric paths A mechanical switch having a connecting portion for connecting. The mechanical switch according to claim 1,
The movable contact spring includes a parallel electric path and a pair of movable contacts arranged opposite to each other, and the pressed portion extends in a direction opposite to the operation direction of the pair of movable contacts. Mechanical switch provided in the installation section. A mechanical switch according to claim 12,
The movable contact spring is a mechanical switch formed integrally with a connecting portion for connecting the parallel electric circuit. The mechanical switch according to claim 12 or 13,
The pressed part is a mechanical switch formed narrower than the parallel electric path. The mechanical switch according to claim 1,
The movable terminal is a mechanical switch in which a plurality of pairs are separated from each other at the front end portion to configure an electric circuit in parallel.

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